CN113877525A - Method for restoring heavy metal polluted water body by magnetic coke - Google Patents
Method for restoring heavy metal polluted water body by magnetic coke Download PDFInfo
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- CN113877525A CN113877525A CN202111059714.6A CN202111059714A CN113877525A CN 113877525 A CN113877525 A CN 113877525A CN 202111059714 A CN202111059714 A CN 202111059714A CN 113877525 A CN113877525 A CN 113877525A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 239000000571 coke Substances 0.000 title claims abstract description 53
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000003245 coal Substances 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 14
- 239000011651 chromium Substances 0.000 claims abstract description 12
- 239000010949 copper Substances 0.000 claims abstract description 10
- 229910052595 hematite Inorganic materials 0.000 claims abstract description 7
- 239000011019 hematite Substances 0.000 claims abstract description 7
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 238000000227 grinding Methods 0.000 claims abstract description 5
- 239000012528 membrane Substances 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 238000001179 sorption measurement Methods 0.000 claims abstract description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 3
- 229910052802 copper Inorganic materials 0.000 claims abstract description 3
- 239000011701 zinc Substances 0.000 claims abstract description 3
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000000197 pyrolysis Methods 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 2
- 239000002802 bituminous coal Substances 0.000 claims description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 2
- 238000010907 mechanical stirring Methods 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims description 2
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 6
- 230000008439 repair process Effects 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract description 3
- 239000012299 nitrogen atmosphere Substances 0.000 abstract description 2
- 238000004939 coking Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 230000005389 magnetism Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000009388 chemical precipitation Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- 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
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
-
- 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
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
- B01J20/28009—Magnetic properties
-
- 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
-
- 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
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- 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
-
- 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
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention provides a method for restoring heavy metal polluted water body by magnetic coke, which comprises the steps of fully mixing raw coal powder obtained by grinding and hematite powder according to a mass ratio of 1: 9-99, pyrolyzing the mixture for 1-2 hours at high temperature (700-1000 ℃) in a nitrogen atmosphere, and naturally cooling the mixture to obtain the magnetic coke. Adding a certain amount of magnetic coke into water polluted by heavy metals such as chromium, copper and zinc to repair the pollution of the water, and recovering the repair material by a filter membrane or a magnet adsorption mode and the like after the repair is finished. The invention has the beneficial effects that: the magnetic coke can effectively remove heavy metal elements such as Cr (VI), Cu (II), Zn (II) and the like in the water body, greatly improve the removal efficiency and ensure that the repaired water body can be reused. The preparation process of the magnetic coke is simple, the workload is less, the repair process is simple, and the repair operation process of the heavy metal polluted water body is simple and convenient.
Description
Technical Field
The invention relates to the field of environmental protection, in particular to the technical field of heavy metal pollution recovery, and particularly relates to a method for restoring a heavy metal polluted water body by using magnetic coke.
Background
With the development of mining, smelting and manufacturing industries, the heavy metal pollution of surrounding water bodies is increasingly serious, and the safety of local ecological environment is threatened.
At present, scholars at home and abroad develop a great deal of research work on the repair and treatment of heavy metal polluted water bodies of Cr (VI), Cu (II) and Zn (II) which are representative in the smelting industry. The main treatment methods include adsorption technology, chemical precipitation technology, biotechnology, and the like. The adsorption technology is a means for adsorbing and fixing heavy metal ions by utilizing the characteristics of rich pores, larger specific surface area and the like of a porous medium material, and can effectively separate and remove the heavy metal ions from water. It has been widely used because of its advantages of high efficiency, simple process, easy operation, etc. The current common porous medium materials comprise activated carbon, biochar and the like, and the materials can effectively remove heavy metal ions in a water body. However, practical use also presents different drawbacks. For example, activated carbon is expensive, and spontaneous combustion often occurs in the case of large-scale long-distance transportation of biochar; after the materials are mixed with water, the materials can be separated only in a filtering mode, and the operation is inconvenient.
Therefore, it is necessary to develop new high-efficiency adsorbents and use the adsorbents in the remediation and treatment work of heavy metal polluted water bodies.
Disclosure of Invention
In order to solve the problems, the invention provides a method for restoring heavy metal polluted water body by magnetic coke, which mainly comprises the following steps:
s1: grinding and crushing the iron ore and the raw coal respectively;
s2: fully mixing iron ore powder and raw coal powder according to a set mass to obtain a mixture;
s3: heating the mixture under an anaerobic condition, carrying out high-temperature pyrolysis, and naturally cooling to room temperature after pyrolysis is finished to obtain magnetic coke;
s4: putting the magnetic coke into a heavy metal polluted water body, and continuously oscillating to adsorb the heavy metal in the water body;
s5: and separating the magnetic coke which adsorbs the heavy metals from the water body, namely realizing the restoration of the water body polluted by the heavy metals.
Further, the iron ore is at least one of hematite, limonite and magnetite, and the raw coal is coking coal or bituminous coal.
Further, the iron ore and the raw coal are ground and crushed to 200 meshes.
Further, the set mass ratio is 1: 9-99.
Further, the iron ore powder is mixed with the raw coal powder by means of mechanical stirring.
Further, heating the mixture to 700-1000 ℃.
Further, the heating rate of the mixture is 8 ℃/min, and the pyrolysis time is 1-2 h.
Furthermore, the adding amount of the magnetic coke is 5-20 g/L, and the oscillation frequency is 180-200 rpm.
Further, the heavy metal in the heavy metal polluted water body is at least one of chromium, copper and zinc, and the initial concentration is 1-100 mg/L.
Further, the magnetic coke is separated from the water body by means of filtration with a filter membrane or adsorption with an external magnetic field.
The technical scheme provided by the invention has the beneficial effects that:
(1) the magnetic coke can effectively remove heavy metal elements such as Cr (VI), Cu (II), Zn (II) and the like in a water body, and compared with common coke, the removal efficiency is greatly improved.
(2) The magnetism that magnetism coke possessed can be convenient for use magnet equipment to separate coke from handling the water for the water after restoreing can realize recycling.
(3) The preparation process of the magnetic coke is simple, the workload is less, and the operation process of restoring the heavy metal polluted water body is simple and convenient.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a flow chart of a method for repairing a heavy metal contaminated water body by using magnetic coke in the embodiment of the invention.
FIG. 2 is a diagram of the effect of magnetic coke on repairing a water body polluted by Cr (VI), Cu (II) and Zn (II) according to an embodiment of the present invention.
FIG. 3 is a diagram showing the effect of the magnetic coke on the heavy metal contaminated water body in the embodiment of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
The embodiment of the invention provides a method, equipment and storage equipment for restoring heavy metal polluted water body by magnetic coke.
Referring to fig. 1-3, fig. 1 is a flowchart illustrating a method for repairing a water body polluted by heavy metals by using magnetic coke according to an embodiment of the present invention, fig. 2 is a histogram illustrating the effect of magnetic coke on repairing a water body polluted by cr (vi), cu (ii), and zn (ii) according to an embodiment of the present invention, fig. 3 is a diagram illustrating the effect of magnetic coke on a water body polluted by heavy metals according to an embodiment of the present invention, and the method specifically includes the following steps:
s1, grinding coking coal and hematite respectively to 200 meshes;
s2, sufficiently mixing the coking coal powder and the hematite powder according to the mass ratio of 19: 1;
s3, heating the obtained mixture to 900 ℃ at the speed of 8 ℃/min under an anaerobic condition (such as in a nitrogen atmosphere), then carrying out high-temperature pyrolysis for 2h, and naturally cooling to room temperature after pyrolysis is finished to obtain magnetic coke;
s4, respectively putting 0.4g of the magnetic coke into 40mL of Cr (VI) polluted water body with the initial concentration of 11086 mu g/L, 15233 mu g/L and 8815 mu g/L, and continuously oscillating for 24 hours at the frequency of 180 rpm;
s5, separating the magnetic coke which has adsorbed the heavy metal from the water body by using a filter membrane or in a mode of an external magnetic field, namely realizing the restoration of the heavy metal polluted water body.
The concentration of Cr (VI) in the repaired polluted water body is reduced to <20 mu g/L, the removal efficiency is more than 99.8 percent, the concentration of Zn (II) is reduced to <280 mu g/L, the removal efficiency is more than 98.1 percent, the concentration of Cu (II) is reduced to <1.6 mu g/L, and the removal efficiency is more than 99.9 percent.
Example 2
S1, grinding coking coal and hematite respectively to 200 meshes;
s2, sufficiently mixing the coking coal powder and the hematite powder according to the mass ratio of 19: 1;
s3, heating the obtained mixture to 700 ℃ at a speed of 8 ℃/min under an anaerobic condition, then pyrolyzing the mixture at a high temperature for 2 hours, and naturally cooling the pyrolyzed mixture to room temperature to obtain magnetic coke;
s4, respectively putting 0.4g of the magnetic coke into 40mL of Cr (VI) polluted water body with the initial concentration of 11086 mu g/L, 15233 mu g/L and 8815 mu g/L, and continuously oscillating for 24 hours at the frequency of 180 rpm;
s5, separating the magnetic coke which has adsorbed the heavy metal from the water body by using a filter membrane or in a mode of an external magnetic field, namely realizing the restoration of the heavy metal polluted water body.
The concentration of Cr (VI) in the repaired polluted water body is reduced to <8089 mu g/L, the removal efficiency is >27.1 percent, the concentration of Zn (II) is reduced to <5451 mu g/L, the removal efficiency is >64.2 percent, the concentration of Cu (II) is reduced to <1778 mu g/L, and the removal efficiency is >79.8 percent.
The invention has the beneficial effects that:
(1) the magnetic coke can effectively remove heavy metal elements such as Cr (VI), Cu (II), Zn (II) and the like in a water body, and compared with common coke, the removal efficiency is greatly improved.
(2) The magnetism that magnetism coke possessed can be convenient for use magnet equipment to separate coke from handling the water for the water after restoreing can realize recycling.
(3) The preparation process of the magnetic coke is simple, the workload is less, and the operation process of restoring the heavy metal polluted water body is simple and convenient.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A method for restoring heavy metal polluted water body by magnetic coke is characterized by comprising the following steps: the method comprises the following steps:
s1: grinding and crushing the iron ore and the raw coal respectively;
s2: fully mixing iron ore powder and raw coal powder according to a set mass to obtain a mixture;
s3: heating the mixture under an anaerobic condition, carrying out high-temperature pyrolysis, and naturally cooling to room temperature after pyrolysis is finished to obtain magnetic coke;
s4: putting the magnetic coke into a heavy metal polluted water body, and continuously oscillating to adsorb the heavy metal in the water body;
s5: and separating the magnetic coke which adsorbs the heavy metals from the water body, namely realizing the restoration of the water body polluted by the heavy metals.
2. The method for remediating the heavy metal polluted water body by using the magnetic coke as claimed in claim 1, wherein the method comprises the following steps: in step S1, the iron ore is at least one of hematite, limonite and magnetite, and the raw coal is coke or bituminous coal.
3. The method for remediating the heavy metal polluted water body by using the magnetic coke as claimed in claim 1, wherein the method comprises the following steps: in step S1, the iron ore and the raw coal are both ground and pulverized to 200 mesh.
4. The method for remediating the heavy metal polluted water body by using the magnetic coke as claimed in claim 1, wherein the method comprises the following steps: in step S2, the set mass ratio is 1: 9-99.
5. The method for remediating the heavy metal polluted water body by using the magnetic coke as claimed in claim 1, wherein the method comprises the following steps: in step S2, the iron ore powder and the raw coal powder are mixed with mechanical stirring.
6. The method for remediating the heavy metal polluted water body by using the magnetic coke as claimed in claim 1, wherein the method comprises the following steps: in step S3, heating the mixture to 700-1000 ℃.
7. The method for remediating the heavy metal polluted water body by using the magnetic coke as claimed in claim 1, wherein the method comprises the following steps: in step S3, the heating rate of the mixture is 8 ℃/min, and the pyrolysis time is 1-2 h.
8. The method for remediating the heavy metal polluted water body by using the magnetic coke as claimed in claim 1, wherein the method comprises the following steps: in step S4, the addition amount of the magnetic coke is 5-20 g/L, and the oscillation frequency is 180-200 rpm.
9. The method for remediating the heavy metal polluted water body by using the magnetic coke as claimed in claim 1, wherein the method comprises the following steps: in the step S4, the heavy metal in the heavy metal polluted water body is at least one of chromium, copper and zinc, and the initial concentration is 1-100 mg/L.
10. The method for remediating the heavy metal polluted water body by using the magnetic coke as claimed in claim 1, wherein the method comprises the following steps: in step S5, the magnetic coke is separated from the water body by filtration with a filter membrane or by adsorption with an external magnetic field.
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Application publication date: 20220104 |