CN109663563B - Modified iron tailing sand, preparation and application thereof - Google Patents
Modified iron tailing sand, preparation and application thereof Download PDFInfo
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- CN109663563B CN109663563B CN201811501018.4A CN201811501018A CN109663563B CN 109663563 B CN109663563 B CN 109663563B CN 201811501018 A CN201811501018 A CN 201811501018A CN 109663563 B CN109663563 B CN 109663563B
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- 239000004576 sand Substances 0.000 title claims abstract description 94
- 150000002505 iron Chemical class 0.000 title claims abstract description 81
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 95
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 64
- 229910052742 iron Inorganic materials 0.000 claims abstract description 47
- 230000003115 biocidal effect Effects 0.000 claims abstract description 37
- 241000233866 Fungi Species 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 19
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 15
- 239000011574 phosphorus Substances 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 14
- 238000001179 sorption measurement Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 73
- 239000000203 mixture Substances 0.000 claims description 24
- 239000002245 particle Substances 0.000 claims description 23
- 238000001035 drying Methods 0.000 claims description 16
- 238000000855 fermentation Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 11
- 238000000197 pyrolysis Methods 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 11
- 238000007873 sieving Methods 0.000 claims description 11
- 230000007935 neutral effect Effects 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 6
- 238000010000 carbonizing Methods 0.000 claims description 5
- 229920001661 Chitosan Polymers 0.000 claims description 3
- 230000004308 accommodation Effects 0.000 claims description 3
- 238000011109 contamination Methods 0.000 claims description 2
- 238000011049 filling Methods 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000003763 carbonization Methods 0.000 claims 4
- 150000002500 ions Chemical class 0.000 abstract description 49
- 239000013049 sediment Substances 0.000 abstract description 29
- 239000002994 raw material Substances 0.000 abstract description 11
- 238000005202 decontamination Methods 0.000 abstract description 7
- 230000003588 decontaminative effect Effects 0.000 abstract description 7
- 239000002699 waste material Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005469 granulation Methods 0.000 abstract description 2
- 230000003179 granulation Effects 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 80
- 239000000243 solution Substances 0.000 description 11
- 238000002474 experimental method Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000004064 recycling Methods 0.000 description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052793 cadmium Inorganic materials 0.000 description 4
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 4
- HOKIDJSKDBPKTQ-GLXFQSAKSA-N cephalosporin C Chemical compound S1CC(COC(=O)C)=C(C(O)=O)N2C(=O)[C@@H](NC(=O)CCC[C@@H](N)C(O)=O)[C@@H]12 HOKIDJSKDBPKTQ-GLXFQSAKSA-N 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 239000011133 lead Substances 0.000 description 4
- 239000012265 solid product Substances 0.000 description 4
- 238000004227 thermal cracking Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229930182555 Penicillin Natural products 0.000 description 2
- JGSARLDLIJGVTE-MBNYWOFBSA-N Penicillin G Chemical compound N([C@H]1[C@H]2SC([C@@H](N2C1=O)C(O)=O)(C)C)C(=O)CC1=CC=CC=C1 JGSARLDLIJGVTE-MBNYWOFBSA-N 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000003415 peat Substances 0.000 description 2
- 229940049954 penicillin Drugs 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 238000000643 oven drying Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- 239000002364 soil amendment Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/12—Naturally occurring clays or bleaching earth
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/041—Oxides or hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
- B01J20/08—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04 comprising aluminium oxide or hydroxide; comprising bauxite
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/103—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate comprising silica
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4875—Sorbents characterised by the starting material used for their preparation the starting material being a waste, residue or of undefined composition
- B01J2220/4887—Residues, wastes, e.g. garbage, municipal or industrial sludges, compost, animal manure; fly-ashes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Dispersion Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses modified iron tailing sand which is prepared by mixing and modifying the following raw materials in parts by weight: 2-5 parts of antibiotic fungus residues or biogas residues and 3-8 parts of iron tailing sand. The modified iron tailing sand has stable adsorption performance and is little influenced by pH value and temperature; compared with unmodified iron tailing sand, the adsorption performance of heavy metal ions and phosphorus is greatly improved, and the waste is changed into valuable while the antibiotic residues in antibiotic residues are removed; the invention also provides a preparation method of the modified iron tailing sand, which provides a proper preparation process for obtaining the modified iron tailing sand with excellent performance, high porosity and no antibiotic residue; the invention also provides application of the modified iron tailing sand, which is further suitable for river sediment pollution treatment through granulation and other procedures, and further improves the decontamination effect of the modified iron tailing sand.
Description
Technical Field
The invention relates to the technical field of resource and environmental protection, in particular to modified iron tailing sand, preparation and application thereof.
Background
At present, with the rapid development of industry and agriculture, the problem of heavy metal pollution is more and more emphasized by people, and the 'action plan for preventing and treating water pollution', namely 'ten water' issued by the nation emphasizes the heavy metal pollution and prevention and treatment in water environment. The heavy metal wastewater treatment modes mainly comprise a chemical precipitation method, an electrolytic method, an ion exchange method, an adsorption method, a biological treatment method and a membrane separation method, and the adsorption method is widely applied to wastewater treatment due to simplicity and easiness and high efficiency. However, conventional adsorbents such as activated carbon, ion exchange resins, etc. are expensive and difficult to regenerate. Research and practical engineering application of cheap and efficient alternative materials are increasingly receiving attention.
Iron tailings are waste discarded after iron ore is ground and 'useful component' is selected by iron separation plants under specific technical conditions. The annual tailing yield in China reaches over 100 hundred million tons and has a year-by-year increasing trend. The idle accumulation of a large amount of iron tailings is difficult to manage, and resources are wasted while occupying the land, so how to use the iron tailings becomes an important problem for scientific researchers. The iron tailing sand can be used for light heat insulation materials, cement and ceramic materials, and can also be used as soil amendment and trace element fertilizer. The iron tailing sand is large in specific surface area and easy to settle after separation, and is rich in a large amount of alkaline oxides and silicides, so that the iron tailing sand meets the condition of serving as an adsorbent in water. Through a large number of experiments, the iron tailing sand has adsorption capacity to heavy metal ions such as copper, lead, chromium, cadmium, lead and the like, but the adsorption performance is required to be optimized.
Disclosure of Invention
It is an object of the present invention to solve at least the above problems and to provide at least the advantages to be described later.
It is still another object of the present invention to provide a modified iron tailings sand which is stable in adsorption performance and less affected by pH and temperature; compared with unmodified iron tailing sand, the adsorption performance of heavy metal ions and phosphorus is greatly improved, and the waste is changed into valuable while the antibiotic residues in antibiotic residues are removed;
the invention also aims to provide a preparation method of the modified iron tailing sand, which provides a proper preparation process for obtaining the modified iron tailing sand with excellent performance, high porosity and no antibiotic residue;
the invention also aims to provide an application of the modified iron tailing sand, which is further suitable for river sediment pollution control through granulation and other procedures, and further improves the decontamination effect of the modified iron tailing sand.
To achieve these objects and other advantages and in accordance with the purpose of the invention, there is provided a modified iron tailing sand, which is modified by mixing the following raw materials in parts by weight: 2-5 parts of antibiotic fungus residues or biogas residues and 3-8 parts of iron tailing sand, wherein the biogas residues are solid parts obtained by solid-liquid separation of antibiotic fungus residues anaerobic fermentation residues.
The preparation of the modified iron tailing sand comprises the following steps:
step one, respectively sieving the dried antibiotic fungus residues or biogas residues and iron tailings by a 40-80 mesh sieve for later use;
step two, uniformly mixing 2-5 parts of sieved antibiotic fungus residues or biogas residues with 3-8 parts of iron tailing sand according to parts by weight to prepare a mixture I; and
and thirdly, pyrolyzing and carbonizing the mixture I under anaerobic conditions, heating to 300-700 ℃ at a speed of 8-10 ℃/min in the pyrolyzing and carbonizing process, and then carrying out heat preservation and pyrolysis for 1-4h to obtain the modified iron tailing sand.
Preferably, the method further comprises the following steps:
repeatedly washing the modified iron tailing sand with water until the pH value of the modified iron tailing sand is neutral, and then drying, crushing and sieving the modified iron tailing sand with a 40-80-mesh sieve to obtain neutral modified iron tailing sand;
wherein the temperature of the drying in the first step and the drying in the fourth step are both 80-105 ℃.
An application of modified iron tailing sand in water treatment.
Preferably, the modified iron tailings are used for adsorbing and removing heavy metal pollution and phosphorus pollution in water.
Preferably, 8-10 parts of modified iron tailing sand and 1 part of chitosan are uniformly mixed according to parts by weight to obtain a mixture II for standby;
pressing the mixture II into a plurality of particles with the diameter not more than 6mm, pressing the mixture II into a plurality of vertebral bodies with the height less than 15cm, distributing spiral concave lines on the side walls of the plurality of vertebral bodies, and drying the plurality of particles and the vertebral bodies at the temperature of 180-260 ℃ for later use;
the method comprises the steps that a polygonal accommodating body is manufactured by a net body with the mesh aperture smaller than 10mm, a dividing line is arranged on the diagonal line of the polygonal accommodating body in a penetrating mode to divide the polygonal accommodating body into a plurality of triangular accommodating cavities or polygonal accommodating cavities, and a plurality of particles are filled in the triangular accommodating cavities or polygonal accommodating cavities;
the circular bottom surfaces of the plurality of vertebral bodies are rotatably arranged towards the lower surface of the polygonal accommodating body, and the plurality of vertebral bodies are sequentially arranged on a plurality of corners of the polygonal accommodating body; and
the polygonal accommodating bodies fixed with the plurality of vertebral bodies are paved at the bottom of the water body in a pairwise spacing mode, and the tip parts of the plurality of vertebral bodies are inserted into bottom mud at the bottom of the water body.
Preferably, the mesh body with the mesh aperture smaller than 10mm is made into a plurality of cylinders, a plurality of particles are respectively filled in the plurality of cylinders, two ends of the plurality of cylinders filled with the particles are respectively fixed on the round bottom surfaces of two adjacent vertebrae of any polygonal accommodating body, and part of arc-shaped side walls of the plurality of cylinders are contacted with and fixed on the upper surfaces of the polygonal accommodating bodies.
Preferably, the maximum side length of the polygonal accommodation body is 30cm and 1m 2 At least one polygonal accommodating body is paved at the bottom of the water body;
the maximum diameter of the circular bottom surface of any one of the plurality of vertebral bodies is 5cm;
the maximum diameter of the cross section of any one of the plurality of cylinders is 4cm.
Preferably, a tip body is convexly arranged on the round bottom surface of any one of the plurality of vertebral bodies, and the tip body is arranged on the axis of any one of the vertebral bodies;
a plurality of caps are respectively rotatably buckled on the round bottom surfaces of the plurality of vertebrae, and the diameter of an opening of any cap is smaller than the diameter of the round bottom surface of any vertebrae correspondingly buckled; corresponding to the center body, a counter bore is formed on the round top surface in the plurality of cap bodies, the center body can rotate to penetrate into the counter bore, and a plurality of corners of the polygonal accommodating body and two ends of the plurality of cylinder bodies are respectively fixed on the outer side walls of the plurality of cap bodies.
Preferably, the height of the cap body is not more than 3cm.
The invention at least comprises the following beneficial effects:
1) The source of the iron tailing sand used as the preparation raw material is wide, the cost is low, the iron tailing sand has no toxic or harmful effect, no secondary pollution is generated, and a new way is provided for solving the recycling treatment problem of the iron tailing sand;
2) The adsorption performance of the antibiotic fungus dreg modified iron tailing sand is stable, and the adsorption performance is little influenced by pH value and temperature;
3) The iron tailing sand can greatly improve the adsorption performance of heavy metal ions and phosphorus after modification, and when the modified iron tailing sand provided by the invention is used for sewage treatment, the granulated modified iron tailing sand is directly put into a water body, so that the specific gravity is high, the granularity is coarse, the mixing time is short, the operation is simple, the solid-liquid separation is easy, the pollution control by waste is realized, and the treatment cost of industrial solid waste and the pollution water body treatment cost are greatly reduced;
4) Further, the polygonal containing body fixed with the plurality of vertebral bodies is paved at the bottom of the natural water body according to a certain density, on one hand, heavy metal pollution and phosphorus pollution in the water body can be adsorbed as much as possible by particles in the polygonal containing body, and on the other hand, heavy metal pollution and phosphorus pollution in bottom mud at the bottom of the water body can be adsorbed through the plurality of vertebral bodies; thereby realizing the three-dimensional decontamination treatment of the water body and the bottom mud;
5) The antibiotic residues are used as dangerous wastes, and the antibiotic residues are eliminated during modification by high-temperature treatment in the process of preparing the antibiotic modified iron tailing sand, so that the recycling utilization is realized;
in conclusion, the modified iron tailing sand, the preparation and the application thereof provided by the invention can solve the problems of recycling of a large amount of antibiotic fungus residues and environmental pollution by using waste to treat pollution, can solve the problems of stacking a large amount of iron tailing sand, water pollution and the like, and have great significance in promoting sustainable development of industry, agriculture and pharmaceutical industry and protecting ecological environment, and have huge economic, social and ecological benefits and wide application prospect. Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic illustration of steps for the preparation of modified iron tailings sand in accordance with one embodiment of the present invention;
FIG. 2 is a schematic top view of a polygonal receiving body with a plurality of vertebral bodies secured thereto according to one embodiment of the present invention;
FIG. 3 is a schematic top view of a polygonal receiving body with a plurality of vertebral bodies secured thereto according to yet another embodiment of the present invention;
FIG. 4 is a schematic top view of a polygonal receiving body with a plurality of vertebral bodies secured thereto according to yet another embodiment of the present invention;
FIG. 5 is a schematic top view of a polygonal receiving body with a plurality of vertebral bodies secured thereto according to yet another embodiment of the present invention;
FIG. 6 is a schematic top view of a polygonal receiving body with a plurality of vertebral bodies secured thereto according to yet another embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view of the portion A in FIG. 2;
FIG. 8 is a schematic cross-sectional view of the portion B of FIG. 5;
fig. 9 is a schematic cross-sectional view of any one of the vertebral bodies and its cap according to still another embodiment of the present invention.
Detailed Description
The present invention is described in further detail below with reference to examples to enable those skilled in the art to practice the same by referring to the description.
It will be understood that terms, such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
The modified iron tailing sand is prepared by mixing and modifying the following raw materials in parts by weight: 2-5 parts of antibiotic fungus residues or biogas residues and 3-8 parts of iron tailing sand, wherein the biogas residues are solid parts obtained by solid-liquid separation of antibiotic fungus residues anaerobic fermentation residues.
The preparation of the modified iron tailing sand comprises the following steps:
step one, respectively sieving the dried antibiotic fungus residues or biogas residues and iron tailings by a 40-80 mesh sieve for later use;
step two, uniformly mixing 2-5 parts of sieved antibiotic fungus residues or biogas residues with 3-8 parts of iron tailing sand according to parts by weight to prepare a mixture I;
step three, pyrolyzing and carbonizing the mixture I under anaerobic conditions, heating to 300-700 ℃ at a speed of 8-10 ℃/min in the pyrolyzing and carbonizing process, and then carrying out heat preservation and pyrolysis for 1-4h to obtain modified iron tailing sand; and
repeatedly washing the modified iron tailing sand with water until the pH value of the modified iron tailing sand is neutral, and then drying, crushing and sieving the modified iron tailing sand with a 40-80-mesh sieve to obtain neutral modified iron tailing sand;
wherein the temperature of the drying in the first step and the drying in the fourth step are both 80-105 ℃.
An application of modified iron tailing sand in water treatment.
In a preferred embodiment, the modified iron tailings are used for adsorbing and removing heavy metal pollution and phosphorus pollution in water.
As shown in fig. 2-7, in a preferred scheme, 8-10 parts of the modified iron tailing sand and 1 part of chitosan are uniformly mixed according to parts by weight to obtain a mixture II for standby; pressing the mixture II into a plurality of particles 10 with the diameter not more than 2cm, pressing the mixture II into a plurality of vertebral bodies 20 with the height less than 15cm, distributing spiral concave lines 201 on the side walls of the plurality of vertebral bodies, and drying the plurality of particles and the vertebral bodies at the temperature of 180-260 ℃ for later use; the mesh body with the mesh aperture smaller than 10mm is manufactured into a polygonal accommodating body 30, a dividing line 301 is penetrated on the diagonal line of the polygonal accommodating body to divide the polygonal accommodating body into a plurality of triangular accommodating cavities or polygonal accommodating cavities, and a plurality of particles are filled in the triangular accommodating cavities or polygonal accommodating cavities; the circular bottom surfaces of the plurality of vertebral bodies are rotatably arranged towards the lower surface of the polygonal accommodating body, and the plurality of vertebral bodies are sequentially arranged on a plurality of corners of the polygonal accommodating body; the net body can contain a plurality of particles for intensively absorbing heavy metal pollution and phosphorus pollution in the water body; filling a plurality of particles into the net body, so that the particles are conveniently and intensively thrown into the water body, or conveniently treating the water body for a certain time and then recycling the particles; a parting line is penetrated on a diagonal line, and the upper surface net body and the lower surface net body of the multi-deformation accommodating body are locally fixed, so that the whole multi-deformation accommodating body is in a lamellar structure, and is paved at the bottom of a water body as far as possible; the plurality of vertebral bodies are arranged as follows: on one hand, the polygonal net body is fixed in an auxiliary mode, and on the other hand, a plurality of vertebral bodies penetrate into the bottom mud, so that heavy metal pollution and phosphorus pollution in the bottom mud can be further adsorbed; thereby realizing the three-dimensional decontamination of the water body and the bottom mud; and paving the polygonal accommodating bodies fixed with the plurality of vertebral bodies at intervals on the bottom of the water body, wherein the tip parts of the plurality of vertebral bodies are inserted into the bottom mud 40 on the bottom of the water body.
As shown in fig. 8, in a preferred embodiment, a mesh body having a mesh aperture smaller than 10mm is formed into a plurality of cylinders 50, and a plurality of particles are respectively filled in the plurality of cylinders, both ends of the plurality of cylinders filled with the particles are respectively fixed to circular bottom surfaces of two adjacent vertebrae of any one polygonal receiving body, and partial arc-shaped side walls of the plurality of cylinders are in contact with and fixed to upper surfaces of the polygonal receiving body. The multiple cylinders are used for supporting multiple side lengths of the polygonal net body in an auxiliary mode, so that the polygonal net body is easier to keep in a lamellar polygonal structure, when the polygonal net body is put into water, the polygonal net body can be spread and arranged at the bottom of the water smoothly, and multiple vertebral bodies are easy to insert into bottom mud.
In a preferred embodiment, the polygonal accommodation body has a maximum side length of 30cm and 1m 2 At least one polygonal accommodating body is paved at the bottom of the water body; the maximum diameter of the circular bottom surface of any one of the plurality of vertebral bodies is 5cm; the maximum diameter of the cross section of any one of the plurality of cylinders is 4cm. The structure of the multi-deformation containing body is not too large, and the normal growth of vegetation at the bottom of the water body is prevented from being influenced while the decontamination effect is ensured, wherein the side length of the polygonal containing body can be 10cm, 15cm, 20cm, 25cm or 30 cm; the diameter of the circular bottom surface of any one of the plurality of vertebral bodies can be 3cm, 4cm or 5cm, etc.; the diameter of the cross section of any one of the plurality of cylinders may be 2cm, 3cm, 4cm, or the like, depending on the diameter of the particles.
As shown in fig. 9, in a preferred embodiment, a tip 202 is convexly disposed on a circular bottom surface of any one of the plurality of vertebral bodies, and the tip is disposed on an axis of any one of the plurality of vertebral bodies; a plurality of caps 60 are rotatably buckled on the circular bottom surfaces of the plurality of vertebrae respectively, and the diameter of an opening of any cap is smaller than the diameter of the circular bottom surface of any vertebrae correspondingly buckled; corresponding to the center body, a counter bore 601 is formed on the round top surface in the plurality of cap bodies, the center body can rotate to penetrate into the counter bore, and a plurality of corners of the polygonal accommodating body and two ends of the plurality of cylinder bodies are respectively fixed on the outer side walls of the plurality of cap bodies. The tip body is a cone which is reversely arranged with any cone, the tip end of the tip body is arranged towards the cover body, the tip end of the tip body is adaptively inserted into a counter bore on the cover body, and the real-time relative rotation of the cone and the cap body can be kept in the axial direction of the axis body.
In a preferred embodiment, the height of the cap is not more than 3cm. The height of the cap body is not too high, the vertebral body can not be influenced to be deep into the bottom mud, and the height of the cap body can be 2cm, 2.5cm or 3cm.
Example 1
The modified iron tailing sand is prepared by mixing and modifying the following raw materials in parts by weight: 2 parts of antibiotic fungus residues or biogas residues and 3 parts of iron tailing sand, wherein the biogas residues are solid parts obtained by solid-liquid separation of antibiotic fungus residues anaerobic fermentation residues.
Example 2
The modified iron tailing sand is prepared by mixing and modifying the following raw materials in parts by weight: 3 parts of antibiotic fungus residues or biogas residues and 5 parts of iron tailing sand, wherein the biogas residues are solid parts obtained by solid-liquid separation of antibiotic fungus residues anaerobic fermentation residues.
Example 3
The modified iron tailing sand is prepared by mixing and modifying the following raw materials in parts by weight: 4 parts of antibiotic fungus residues or biogas residues and 6 parts of iron tailing sand, wherein the biogas residues are solid parts obtained by solid-liquid separation of antibiotic fungus residues anaerobic fermentation residues.
Example 4
The modified iron tailing sand is prepared by mixing and modifying the following raw materials in parts by weight: 5 parts of antibiotic fungus residues or biogas residues and 8 parts of iron tailing sand, wherein the biogas residues are solid parts obtained by solid-liquid separation of antibiotic fungus residues anaerobic fermentation residues.
The porosity and the relative density of the modified iron tailings in examples 1 to 4 and the iron tailings as raw materials were measured, respectively, and the measurement results were shown in table 1 below:
TABLE 1 porosity and relative Density
Example 5:
preparation of modified iron tailing sand:
the iron tailing sand is from Fengning county of the beard city of Hebei province, and the main chemical components of the iron tailing sand are shown in Table 2:
TABLE 2 iron tailings main chemical composition
| Chemical composition | SiO 2 | Al 2 O 3 | Fe 2 O 3 | MgO | CaO |
| Content (%) | 58.18 | 7.07 | 17.97 | 2.08 | 8.47 |
The antibiotic fungus dreg is taken from a certain pharmaceutical factory in Shijia, and is penicillin fungus dreg with the water content of 91.5 percent, and is dried at 105 ℃, crushed and sieved by a 80-mesh sieve; at the same time iron tailing sandAnd also sieved through an 80 mesh sieve. According to 4 parts of antibiotic fungus residues: 7 parts of iron tailing sand are uniformly mixed. The mixture is then placed in a tube furnace for thermal cracking, where N 2 The flow rate is 25mL/min, the set highest temperature is 600 ℃, the heating rate is 10 ℃/min, and the temperature is kept for 2 hours after the temperature is raised to 600 ℃ from the room temperature. And after pyrolysis is finished, cooling to room temperature, taking out a solid product, washing with clear water to be neutral, drying, grinding, and sieving with a 80-mesh sieve to obtain the modified iron tailing sand.
Example 6
The iron tailing sand is derived from the following city of Tangshan city of Hebei province, and the main chemical components of the iron tailing sand are shown in Table 3:
TABLE 3 iron tailings main chemical composition
| Chemical composition | SiO 2 | Al 2 O 3 | Fe 2 O 3 | MgO | CaO |
| Content (%) | 54.31 | 12.86 | 13.26 | 4.54 | 5.99 |
Anaerobic fermentation of penicillin fungus residue to obtain biogas residue with water content of 86.7%, oven drying at 105deg.C, pulverizing, and sieving with 60 mesh sieve; meanwhile, the iron tailings are also sieved by a 60-mesh sieve. 3 parts of anaerobic fermentation biogas by antibiotic fungus residues: 5 parts of iron tailing sand are uniformly mixed. The mixture is then placed in a tube furnace for thermal cracking, where N 2 The flow is 30mL/min, the temperature is 500 ℃, the heating rate is 8 ℃/min, and the constant temperature is kept for 1.5h after the temperature is increased to the set temperature. And after pyrolysis is finished, cooling to room temperature, taking out a solid product, washing with clear water to be neutral, drying, grinding, and sieving with a 60-mesh sieve to obtain the modified iron tailing sand.
Example 7
The sources of iron tailings are as in table 2.
The antibiotic fungus dreg is taken from a pharmaceutical factory in Shijia, is cephalosporin C fungus dreg, has the water content of 90.2 percent, is dried at 105 ℃, crushed and sieved by a 40-sieve; meanwhile, the iron tailings are also sieved by a 40-mesh sieve. According to 2 parts of antibiotic fungus residues: 3 parts of iron tailing sand are uniformly mixed. The mixture is then placed in a tube furnace for thermal cracking, where N 2 The flow is 30mL/min, the temperature is 300 ℃, the heating rate is 10 ℃/min, and the constant temperature is kept for 4h after the temperature is increased to the set temperature. And after pyrolysis is finished, cooling to room temperature, taking out a solid product, washing with clear water to be neutral, drying, grinding, and sieving with a 40-mesh sieve to obtain the modified iron tailing sand.
Example 8
The iron tailings were sourced as in table 3.
The cephalosporin C fungus dreg anaerobic fermentation biogas dreg has water content of 88.3 percent, is dried at 105 ℃, crushed and sieved by a 80-mesh sieve; meanwhile, the iron tailings are also sieved by an 80-mesh sieve. Anaerobic fermentation of biogas is carried out according to 5 parts of antibiotic fungus residues: 8 parts of iron tailing sand are uniformly mixed. The mixture is then placed in a tube furnace for thermal cracking, where N 2 The flow rate is 25mL/min, the temperature is 700 ℃, the heating rate is 10 ℃/min, and the temperature is kept for 1h after the temperature is increased to the set temperature. And after pyrolysis is finished, cooling to room temperature, taking out a solid product, washing with clear water to be neutral, drying, grinding, and sieving with a 80-mesh sieve to obtain the modified iron tailing sand.
The grain size fractions of the modified iron tailings sand of examples 5 to 8 were examined, and the results are shown in the following table 4:
TABLE 4 fraction of modified iron tailings sand
The modified iron tailings prepared in application examples 5 to 8 are used for treating heavy metal polluted water, and the specific steps are as follows:
respectively preparing heavy metal ion solutions with total concentration of 100mg/L, 150mg/L and 200mg/L (wherein the heavy metal ions can be heavy metal ions such as copper, lead, chromium, cadmium, lead and the like) for standby;
experimental group: the modified iron tailings of the example 5, the example 6, the example 7 and the example 8 are respectively put into heavy metal ion solutions with different concentrations according to the same mass-to-volume ratio of 1g to 1L to be used as an experimental group 1, an experimental group 2, an experimental group 3 and an experimental group 4;
control group: and (3) taking the unmodified iron tailing sand as a reference, and respectively adding the unmodified iron tailing sand into a heavy metal ion solution according to the same mass-volume ratio of 1g to 1L to serve as a reference group I, a reference group II and a reference group III.
The removal rates of heavy metal ions in each experimental group and each control group in the heavy metal ion solutions with different concentrations are respectively detected, and the specific results are shown in the following table 5:
TABLE 5 heavy metal ion removal Rate
The modified iron tailings prepared in application examples 5 to 8 were used for treating water of phosphorus element, and the concrete steps are as follows:
respectively preparing solutions with phosphorus concentration of 5mg/L, 10mg/L and 15mg/L for later use;
experimental group: the modified iron tailings of the example 5, the example 6, the example 7 and the example 8 are respectively put into heavy metal ion solutions with different concentrations according to the same mass-to-volume ratio of 2g to 1L to be used as an experimental group 5, an experimental group 6, an experimental group 7 and an experimental group 8;
control group: and (3) taking the unmodified iron tailing sand as a reference, and respectively adding the unmodified iron tailing sand into a heavy metal ion solution according to the same mass-volume ratio of 2g to 1L to serve as a reference group IV, a reference group V and a reference group VI.
The removal rates of heavy metal ions in each experimental group and each control group in the heavy metal ion solutions with different concentrations are respectively detected, and the specific results are shown in the following table 6:
TABLE 6 phosphorus removal Rate
From tables 5 and 6 above, it can be seen that the modified iron tailings prepared in this application significantly improved the removal effect of heavy metal pollution and phosphorus pollution of the water body, and the removal effect of heavy metal pollution and phosphorus pollution of the modified iron tailings obtained in example 7 was more excellent, compared to the iron tailings as the raw material.
Example 9
Use of modified iron tailings for adsorption removal of heavy metal contamination in water treatment;
preparing artificial bottom mud: the artificial sediment is formed by uniformly mixing and stirring 10% of peat moss, 20% of bentonite and 70% of industrial quartz sand (the grain diameter is smaller than 0.2 mm);
preparing a heavy metal ion solution: respectively preparing heavy metal ion solutions with total concentration of 100mg/L, 150mg/L and 200mg/L (wherein the heavy metal ions can be heavy metal ions such as copper, lead, chromium, cadmium, lead and the like) for standby;
respectively paving the artificial sediment in three artificial pools with the same specification, wherein the paving heights of the artificial sediment in the three artificial pools with the same specification are respectively 15cm, 20cm and 25cm;
injecting heavy metal ion solutions with the concentration of 100mg/L, 150mg/L and 200mg/L respectively into three artificial pools with the same specification, stopping injecting water after the liquid level of the three artificial pools with the same specification is 20cm higher than the upper surface of the bottom mud, and standing and soaking for 24 hours;
the partition boards are vertically inserted into the middle parts of three artificial pools with the same specification, which are subjected to standing treatment, respectively, the three artificial pools with the same specification are divided into two equal parts to serve as an experiment pool and a comparison pool, and are respectively numbered as an experiment pool 1 and a comparison pool 1, an experiment pool 2 and a comparison pool 2, and an experiment pool 3 and a comparison pool 3.
Experimental group: a quadrangular structure with four cones (side length: 30 cm), a pentagonal structure with five cones (side length: 20 cm), a hexagonal structure with six cones (side length: 10 cm) was prepared using the modified iron tailings sand obtained in example 7;
according to the same mass-to-volume ratio of 1g to 1L, respectively paving four pyramid structures, five pyramid pentagon structures and six pyramid hexagon structures in an experimental tank 1, an experimental tank 2 and an experimental tank 3 to be used as an experimental group 1, an experimental group 2 and an experimental group 3, and periodically detecting the content of heavy metal ions in a water body, wherein the detection results are shown in the following table 7;
two artificial sediment digging points with the depth of 5cm to 7cm are respectively arranged in the experimental tank 1, the experimental tank 2 and the experimental tank 3; the two artificial sediment digging points are distributed on the same radius with the axis of one cone as the center of a circle, and the horizontal distance between the two artificial sediment digging points and the axis of the cone is 5cm and 10cm; the method comprises the steps of (1) digging 5g of artificial sediment at two artificial sediment digging points while periodically detecting the content of heavy metal ions in a water body, centrifuging the obtained centrifugal water, and detecting the content of heavy metal ions in the centrifugal water to obtain an experimental group 1-1, an experimental group 1-2, an experimental group 2-1, an experimental group 2-2, an experimental group 3-1 and an experimental group 3-2, wherein the detection results are shown in the following table 8;
control group: according to the application provided by the invention, the non-modified iron tailing sand is used as a raw material to prepare a quadrilateral structure body with four vertebral bodies, a pentagonal structure body with five vertebral bodies and a hexagonal structure body with six vertebral bodies, wherein the quadrilateral structure body is equivalent to the size specification of an experimental group;
respectively paving quadrilateral structures with four cones, pentagonal structures with five cones and hexagonal structures with six cones in a control pool 1, a control pool 2 and a control pool 3 according to the same mass-to-volume ratio of 1g to 1L to serve as a control group 1, a control group 2 and a control group 3, standing for a certain time and carrying out the content of heavy metal ions in a water body, wherein the detection result is shown in the following table 8;
two artificial sediment digging points with the depth of 5cm to 7cm are respectively arranged in the control pool 1, the control pool 2 and the control pool 3; the two artificial sediment digging points are distributed on the same radius with the axis of one cone as the center of a circle, and the horizontal distance between the two artificial sediment digging points and the axis of the cone is 5cm and 10cm; the method comprises the steps of (1) periodically detecting the content of heavy metal ions in a water body, respectively digging 5g of artificial sediment at two artificial sediment digging points, centrifuging to obtain centrifugal water, and detecting the content of heavy metal ions in the centrifugal water, wherein the centrifugal water is used as a control group 1-1, a control group 1-2, a control group 2-1, a control group 2-2, a control group 3-1 and a control group 3-2 respectively, and the detection results are shown in the following table 7;
TABLE 7 heavy metal ion removal Rate
TABLE 8 removal Rate of heavy metal ions (%)
As can be seen from table 7 above, the removal rate of heavy metal ions of the polygonal structure with multiple cones is slightly better than that of the direct application of the modified iron tailing sand;
as can be seen from table 8 above, in the removal rate of heavy metal ions at the excavation points at the corresponding distances and corresponding depths in the same artificial pond, the removal rate of heavy metal ions in water in the artificial bottom mud by the cone prepared by using the modified iron tailings is significantly better than the removal rate of heavy metal ions in water in the artificial bottom mud by the cone prepared by using the unmodified iron tailings, and therefore, the cone prepared by using the modified iron tailings can effectively adsorb and inhibit the diffusion of heavy metal ions in the artificial bottom mud into the upper water body by the cone trenches.
Example 10
The application of the modified iron tailing sand in water treatment is characterized in that the modified iron tailing sand is used for adsorbing and blocking heavy metal ions in the artificial sediment from being released into a water body;
preparing artificial bottom mud: the artificial sediment is formed by uniformly mixing and stirring 10% of peat moss, 20% of bentonite and 70% of industrial quartz sand (the grain diameter is smaller than 0.2 mm);
preparing artificial sediment containing heavy metal ions: respectively preparing artificial sediment with total concentration of 100mg/kg, 150mg/kg and 200mg/kg (wherein heavy metal ions can be heavy metal ions such as copper, lead, chromium, cadmium and lead) for standby;
respectively paving the artificial sediment containing heavy metal ions into two groups of plastic box bodies with the same specification, wherein the first group is an experimental group and the second group is a control group;
wherein each group of plastic box bodies with the same specification comprises three plastic box bodies with the same specification, and the laying height of the artificial sediment containing heavy metal ions in the three plastic box bodies with the same specification is 10cm or 15cm;
experimental group: respectively paving a plurality of particles with the thickness of 3cm and the diameter of not more than 6mm, which are pressed by a mixture II, above the artificial bottom mud of the first group of plastic box bodies with the same specification, then injecting water into the three plastic box bodies with the same specification, stopping injecting water after the liquid level of the water is 10cm higher than the upper surface of the artificial bottom mud, and standing and soaking;
control group: water is injected into the three plastic box bodies with the same specification, the water injection is stopped after the liquid level of the water is 10cm higher than the upper surface of the artificial bottom mud, and the plastic box bodies are subjected to standing soaking treatment.
The contents of heavy metal ions in the water bodies of the experimental group and the control group are detected regularly, and detection results are recorded respectively:
experiment group 4-1 (total concentration of heavy metal ions of artificial sediment is 100 mg/kg);
experiment group 4-2 (total concentration of heavy metal ions of artificial sediment is 150 mg/kg);
experiment group 4-3 (total concentration of heavy metal ions of artificial sediment is 200 mg/kg);
control group 4-1 (total concentration of heavy metal ions of artificial sediment is 100 mg/kg);
control group 4-2 (total concentration of heavy metal ions of artificial sediment is 150 mg/kg);
control group 4-3 (total concentration of heavy metal ions of artificial sediment is 200 mg/kg);
the detection results are shown in the following table 9;
TABLE 9 content of heavy metal ions in Water (μg/L)
As can be seen from table 9 above, the plurality of particles laid above the artificial sediment of the experimental group can effectively block the release of heavy metal ions from the artificial sediment containing heavy metal pollution into the water body, relative to the control group.
In conclusion, the polygonal structure with a plurality of cones prepared by the modified iron tailing sand provided by the invention can realize the three-dimensional decontamination treatment of polluted water and bottom mud; the integration of the polygonal structure with a plurality of vertebral bodies can be used for recycling conveniently after the decontamination treatment is finished.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown, it is well suited to various fields of use for which the invention is suited, and further modifications may be readily made by one skilled in the art, and the invention is therefore not to be limited to the particular details and examples shown and described herein, without departing from the general concepts defined by the claims and the equivalents thereof.
Claims (4)
1. The preparation of the modified iron tailing sand is characterized by comprising the following steps of:
step one, sieving dried antibiotic fungus residues or biogas residues and iron tailings respectively by a sieve of 40-80 meshes for standby, wherein the biogas residues are solid parts obtained by solid-liquid separation of antibiotic fungus residues anaerobic fermentation residues;
step two, uniformly mixing 2-5 parts of sieved antibiotic fungus residues or biogas residues with 3-8 parts of iron tailing sand according to parts by weight to prepare a mixture I;
step three, pyrolyzing and carbonizing the mixture I under anaerobic conditions, wherein N is 2 The flow is 25mL/min or 30mL/min, the temperature is raised to 300-700 ℃ at the speed of 8-10 ℃/min in the pyrolysis carbonization process, and then the pyrolysis is carried out for 1-4h, so as to obtain a pyrolysis carbonization product; and
repeatedly washing the pyrolysis carbonization product with water until the pH value of the pyrolysis carbonization product is neutral, drying, crushing, and sieving with a 40-80 mesh sieve to obtain neutral modified iron tailing sand;
wherein the temperature of the drying in the first step and the drying in the fourth step are both 80-105 ℃, and Fe in the iron tailing sand 2 O 3 The content of (2) is 13.26% or 17.97%.
2. Use of a modified iron tailings produced by the method of the modified iron tailings of claim 1 in water treatment for adsorption removal of heavy metal and phosphorus contamination from water;
uniformly mixing 8-10 parts by weight of modified iron tailing sand with 1 part by weight of chitosan to obtain a mixture II for later use;
pressing the mixture II into a plurality of particles with the diameter not more than 6mm, pressing the mixture II into a plurality of vertebral bodies with the height less than 15cm, distributing spiral concave lines on the side walls of the plurality of vertebral bodies, and drying the plurality of particles and the vertebral bodies at the temperature of 180-260 ℃ for later use;
the method comprises the steps that a polygonal accommodating body is manufactured by a net body with the mesh aperture smaller than 10mm, a dividing line is arranged on the diagonal line of the polygonal accommodating body in a penetrating mode to divide the polygonal accommodating body into a plurality of triangular accommodating cavities or polygonal accommodating cavities, and a plurality of particles are filled in the triangular accommodating cavities or polygonal accommodating cavities;
the circular bottom surfaces of the plurality of vertebral bodies are rotatably arranged towards the lower surface of the polygonal accommodating body, and the plurality of vertebral bodies are sequentially arranged on a plurality of corners of the polygonal accommodating body; and
the polygonal accommodating bodies fixed with a plurality of vertebral bodies are paved at the bottom of the water body in a pairwise spacing way, and the tip parts of the plurality of vertebral bodies are inserted into bottom mud at the bottom of the water body; the method comprises the steps of (1) making a net body with a mesh aperture smaller than 10mm into a plurality of cylinders, respectively filling a plurality of particles into the plurality of cylinders, respectively fixing two ends of the plurality of cylinders filled with the particles onto round bottom surfaces of two adjacent vertebral bodies of any polygonal accommodating body, and contacting and fixing partial arc-shaped side walls of the plurality of cylinders with the upper surfaces of the polygonal accommodating bodies;
a tip body is arranged on the round bottom surface of any one of the plurality of vertebral bodies in a protruding way, and the tip body is arranged on the axis of any one of the vertebral bodies; a plurality of caps are respectively rotatably buckled on the round bottom surfaces of the plurality of vertebrae, and the diameter of an opening of any cap is smaller than the diameter of the round bottom surface of any vertebrae correspondingly buckled; corresponding to the center body, a counter bore is formed on the round top surface in the plurality of cap bodies, the center body can rotate to penetrate into the counter bore, and a plurality of corners of the polygonal accommodating body and two ends of the plurality of cylinder bodies are respectively fixed on the outer side walls of the plurality of cap bodies.
3. The use of modified iron tailings sand in water treatment as claimed in claim 2, wherein the polygonal accommodation body has a maximum side length of 30cm and 1m 2 At least one polygonal accommodating body is paved at the bottom of the water body;
the maximum diameter of the circular bottom surface of any one of the plurality of vertebral bodies is 5cm;
the maximum diameter of the cross section of any one of the plurality of cylinders is 4cm.
4. Use of the modified iron tailings sand of claim 3 in water treatment wherein the cap has a height of no more than 3cm.
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