CN105838379B - A kind of restoration of the ecosystem medicament of tailing heavy-metal contaminated soil - Google Patents
A kind of restoration of the ecosystem medicament of tailing heavy-metal contaminated soil Download PDFInfo
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- CN105838379B CN105838379B CN201610241203.9A CN201610241203A CN105838379B CN 105838379 B CN105838379 B CN 105838379B CN 201610241203 A CN201610241203 A CN 201610241203A CN 105838379 B CN105838379 B CN 105838379B
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- 239000002689 soil Substances 0.000 title claims abstract description 41
- 239000003814 drug Substances 0.000 title claims abstract description 34
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 68
- 229920001661 Chitosan Polymers 0.000 claims abstract description 21
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 20
- 239000000440 bentonite Substances 0.000 claims abstract description 20
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000000725 suspension Substances 0.000 claims abstract description 19
- 239000012065 filter cake Substances 0.000 claims abstract description 17
- 241000287828 Gallus gallus Species 0.000 claims abstract description 11
- 235000007164 Oryza sativa Nutrition 0.000 claims abstract description 11
- 229940036811 bone meal Drugs 0.000 claims abstract description 11
- 239000002374 bone meal Substances 0.000 claims abstract description 11
- 210000003608 fece Anatomy 0.000 claims abstract description 11
- 239000010903 husk Substances 0.000 claims abstract description 11
- 239000010871 livestock manure Substances 0.000 claims abstract description 11
- 238000002360 preparation method Methods 0.000 claims abstract description 11
- 235000009566 rice Nutrition 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 230000003213 activating effect Effects 0.000 claims abstract description 4
- 238000012545 processing Methods 0.000 claims abstract description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 23
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 15
- 238000000197 pyrolysis Methods 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- 239000001569 carbon dioxide Substances 0.000 claims description 11
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 11
- 241000209094 Oryza Species 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000011790 ferrous sulphate Substances 0.000 claims description 7
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 7
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 7
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 7
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims description 6
- 230000032683 aging Effects 0.000 claims description 6
- 230000036760 body temperature Effects 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 230000014759 maintenance of location Effects 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 229960004424 carbon dioxide Drugs 0.000 claims 2
- 229910002090 carbon oxide Inorganic materials 0.000 claims 1
- 238000004090 dissolution Methods 0.000 abstract description 3
- 230000005012 migration Effects 0.000 abstract description 2
- 238000013508 migration Methods 0.000 abstract description 2
- 239000004016 soil organic matter Substances 0.000 abstract description 2
- 238000007711 solidification Methods 0.000 abstract description 2
- 230000008023 solidification Effects 0.000 abstract description 2
- 231100000419 toxicity Toxicity 0.000 abstract description 2
- 230000001988 toxicity Effects 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 240000007594 Oryza sativa Species 0.000 abstract 1
- 238000002386 leaching Methods 0.000 description 14
- 229910052500 inorganic mineral Inorganic materials 0.000 description 6
- 239000011707 mineral Substances 0.000 description 6
- 235000010755 mineral Nutrition 0.000 description 6
- 239000005416 organic matter Substances 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 4
- 235000009508 confectionery Nutrition 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- 238000005406 washing Methods 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 231100000749 chronicity Toxicity 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical group [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000001935 peptisation Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2101/00—Agricultural use
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention is a kind of restoration of the ecosystem medicament of tailing heavy-metal contaminated soil, and the restoration of the ecosystem medicament is mixed by material III and material IV；The material III is using rice husk, chicken manure and bone meal as raw material, by being pyrolyzed, activating preparation gained after mixing；The material IV is that the filter cake being obtained by filtration after being mixed by chitosan solution with medicinal bentonite suspension passes through processing gained.The present invention utilizes part waste, prepare the restoration of the ecosystem medicament that can be used for tailing heavy-metal contaminated soil, not only reduce the dissolution of heavy metal, lower its biological effectiveness and endangers toxicity, the migration and the enrichment in ecological chain for reducing heavy metal, and soil organic matter content can be improved, the soil body after solidification can be directly used as planting soil.
Description
Technical field
The present invention relates to contaminated sites to repair field, in particular for the restoration of the ecosystem medicament of heavy metal tailing, specially
A kind of restoration of the ecosystem medicament of tailing heavy-metal contaminated soil.
Background technique
The stable development of China's economy be unable to do without the support function of mineral resources.Along with rapid development of economy, science
The raising of technical level, mineral resources are more and more developed and used by people, and use scope is also increasingly wider.China's industry
70% or so of the output value is occupied by the basic industries of material and related secondary industry of mineral products, however, mining
After can the large batch of tailing of association.According to incompletely statistics, each year outcast tailing amount in the whole world is more than 100,000,000,000 tons.
The barren rock tailing that metal mine mining and mill run generates generally all contains association heavy metallic mineral and trace rare-earth mine
Object, wherein and commonly Cd, Hg, Pb, Cr etc. harmful to water body and human body.Weathering effect can be generated during the accumulation of tailing barren rock
Fruit banks up place in tailing, the heavy metal contaminants Transport And Transformation in tailing, the nocuousness under rainwash in product from failing
Heavy metal may leach and enter in superficial water, soil, animal, plant and its intracorporal ecological chain of people, give environment and human body band
Carry out long-term and remote harm.Moreover, because mineral composition, secondary mineral ingredient, tailing fineness, content of organics pH value and heap
The difference of porosity is accumulated, existing form is also had nothing in common with each other after heavy metal leaching.
Heavy metal pollution of soil has the characteristics that concealment, chronicity and irreversibility.Harmful heavy metal accumulates in soil
To a certain extent, soil degradation, crop yield and quality decline are not only resulted in, but also can be made by runoff, leaching loss
With polluted surface and underground water, and may directly poisonous plant or the health by food chain approach harmful to human.Therefore, it repairs
Heavy-metal contaminated soil restores soil original function, is always the difficult point studied in the world and hot spot.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of restoration of the ecosystem medicaments for preparing tailing heavy-metal contaminated soil
Method, this method utilize part waste, prepare the restoration of the ecosystem medicament that can be used for tailing heavy-metal contaminated soil, not only
The dissolution for reducing heavy metal lowers its biological effectiveness and endangers toxicity, reduces the migration of heavy metal and the richness in ecological chain
Collection, and soil organic matter content can be improved, the soil body after solidification can be directly used as planting soil.The purpose of the present invention is logical
Cross following technical scheme realization:
A kind of restoration of the ecosystem medicament of tailing heavy-metal contaminated soil, the restoration of the ecosystem medicament is by material III and material IV
It mixes；The material III is using rice husk, chicken manure and bone meal as raw material, by being pyrolyzed, activating preparation gained after mixing；The object
Material IV is that the filter cake being obtained by filtration after being mixed by chitosan solution with medicinal bentonite suspension passes through processing gained.
Further, the material III preparation method the following steps are included:
A, raw material proportioning: rice husk, chicken manure and bone meal are mixed according to 5 ~ 8:1 ~ 3:1 ~ 2 mass ratio, prepare resulting mixture
Ⅰ；
B, it is pyrolyzed: mixture I is put into fixed-bed pyrolysis furnace, be passed through nitrogen displacement atmosphere, startup power supply, control voltage is
180 ~ 200V, heating rate control are 10 ~ 30 DEG C/min, and heating furnace body temperature synchronizes logical to 300 ~ 400 DEG C in heating process
Entering carbon dioxide, pressure carbon dioxide is maintained at 0.05 ~ 0.1MPa/s, and material is made to enter pyrolysis state, and the retention time is 3 ~ 5h,
Obtain material II；
C, activate: it is 10% hereinafter, the acetic acid 4% ~ 6% is molten that material II is dried to moisture content in 80 ~ 100 DEG C of baking oven
It places into 8% ~ 12% ferrous sulfate solution and impregnates 18 ~ 30 hours after being impregnated 18 ~ 30 hours in liquid, obtain material III.
Further, the material IV preparation method the following steps are included:
A, 1 ~ 10g chitosan is weighed to be dissolved in 4% ~ 6% acetum and 2 ~ 3h of stir about, until solution is transparent, system
Obtain 10% ~ 15% chitosan solution；
B, bentonite is added water and stirred, is configured to the suspension of 20 ~ 30% concentration；In 60 ~ 80 DEG C of water-baths, to bentonite
1 ~ 2mL ethylenediamine is added in suspension, it is stirring while adding；
C, chitosan solution is added drop-wise in medicinal bentonite suspension in 80 ~ 100 DEG C of water-baths, 2 ~ 3h of water-bath, cooling, mistake
Filter, obtains filter cake；
D, it washes filter cake 3 ~ 5 times, is then dried in 60 ~ 100 DEG C of baking ovens, ground, cross 200 meshes to get material IV.
Further, the restoration of the ecosystem medicament is mixed mixed according to mass ratio 3 ~ 5:1 ~ 3 by material III and material IV
It closes.
The application method of the restoration of the ecosystem medicament, it is 5%~10% that mass ratio is added in heavy metal tailings pollution place
The restoration of the ecosystem medicament, after contaminated soil and medicament are sufficiently mixed, natural aging.
The beneficial effects of the present invention are:
1, the restoration of the ecosystem medicament in the heavy metal pollution place that the present invention obtains is one kind by the shapes such as carbon-based, iron-based, hydroxyl
At three-dimensional netted cage structure, this special structure can effectively in the form of chemical bond and physical absorption solidify a huge sum of money
Belong to.
2, the confection that mass ratio is 5~10% is added in heavy metal tailings pollution place, by contaminated soil and medicament
After being sufficiently mixed, by natural aging, in the place after reparation, the leaching of lead reduces by 85% or more, the leaching of zinc reduce by 70% with
On, the leaching of copper reduces by 80% or more, and the contaminated soil content of organic matter after reparation increases by 30% or more, and changes of pH exists
Within 0.5, place can be used as planting soil use.
3, the contaminated soil content of organic matter after restoration of the ecosystem medicament of the present invention is repaired increases；
4, restoration of the ecosystem medicament rehabilitating soil pH value of the present invention changes smaller；Place can be used as planting soil use.
Specific embodiment
Embodiment 1
A kind of restoration of the ecosystem medicament of tailing heavy-metal contaminated soil, the restoration of the ecosystem medicament is by material III and material IV
It mixes；The material III is using rice husk, chicken manure and bone meal as raw material, by being pyrolyzed, activating preparation gained after mixing；The object
Material IV is that the filter cake being obtained by filtration after being mixed by chitosan solution with medicinal bentonite suspension passes through processing gained.
Including preparation step in detail below in the present embodiment:
The preparation process of material III are as follows:
A, raw material proportioning: rice husk, chicken manure and bone meal are mixed according to 5 ~ 8:1 of mass ratio ~ 3:1 ~ 2 ratio, are prepared into mixed
Object I is closed, phosphorus content is high in rice husk；Chicken manure is phosphorous and high containing potassium；Bone meal calcic is high, and the collocation of these three substance substances has soil
The allotment of machine matter, permeability are advantageous；
B, it is pyrolyzed: mixture I is put into fixed-bed pyrolysis furnace, after being passed through nitrogen displacement atmosphere, startup power supply controls voltage
For 180 ~ 200V, heating rate control is 10 ~ 30 DEG C/min, and heating furnace body temperature is to 300 ~ 400 DEG C or so, in heating process
It synchronizes and is passed through carbon dioxide, pressure carbon dioxide is maintained at 0.05 ~ 0.1MPa/s, and material is made to enter pyrolysis state, retention time
For 3 ~ 5h, material II is obtained, pyrolysis can sterilize, increase porosity；
C, activate: it is 10% hereinafter, being 5% according to mass ratio that material II is dried to moisture content in 80 ~ 100 degree of baking oven
It is small to place into immersion 18 ~ 30 in 8% ~ 12% ferrous sulfate solution for ratio after impregnating 18 ~ 30 hours in 4% ~ 6% acetic acid solution
When, obtain material III；Wherein: the profit that acetic acid and ferrous sulfate plays rises, peptization and dissolution, forms hole convenient for material II,
It can also allow ferro element appendix on III surface of material, ferro element can play catalytic action, can be with fixed arsenic.
The preparation process of material IV are as follows:
A, weigh that 1 ~ 10g chitosan is dissolved in 4 ~ 6% acetum and 2 ~ 3h of stir about is made until solution is transparent
10 ~ 15% chitosan solution；
B, bentonite is added water and stirred, is configured to the suspension of 20 ~ 30% concentration；In 60 ~ 80 DEG C of water-baths, to bentonite
1 ~ 2mL ethylenediamine is slowly added in suspension, it is stirring while adding；
C, slowly chitosan solution is added drop-wise in medicinal bentonite suspension in 80 ~ 100 DEG C of water-baths, 2 ~ 3h of water-bath；So
After cool down, filter, obtain filter cake, filter cake is the substance reacted above；
D, it washes filter cake 3 ~ 5 times, is then dried in 60 ~ 100 DEG C of baking ovens, ground, cross 200 meshes to get material IV.
Material III is mixed with IV mass ratio of material in the ratio of 3 ~ 5:1 ~ 3, finished medicament is obtained.Two kinds of material mixing,
Just play the role of fixation to heavy metal, adsorption dual.
Embodiment 2
It advanced optimizes on the basis of embodiment 1.
Rice husk, chicken manure and bone meal are mixed according to the ratio of 5:3:2, prepare resulting mixture I.Mixture I is put into fixation
Bed pyrolysis oven, after being passed through nitrogen displacement atmosphere, startup power supply, control voltage is 180V, and heating rate control is 10 DEG C/min,
Heating furnace body temperature synchronizes in heating process to 400 DEG C and is passed through carbon dioxide, and pressure carbon dioxide is maintained at 0.1MPa/s, makes
Material enters pyrolysis state, and retention time 5h obtains material II.Material II, which is dried to moisture content in 100 DEG C of baking oven, is
10%, the ratio for being 5% according to mass ratio places into 10% ferrous sulfate solution after impregnating 24 hours in 5% acetic acid solution
It impregnates 24 hours, obtains material III.
Weigh that 5g chitosan is dissolved in 5% acetum and until solution is transparent 10% chitosan is made in stir about 2h
Solution；It weighs a certain amount of bentonite to add water and stir, is configured to the suspension of 20% concentration；It is outstanding to bentonite in 80 DEG C of water-baths
1 mL ethylenediamine is slowly added in turbid, it is stirring while adding；Chitosan solution is slowly added drop-wise to swelling in 100 DEG C of water-baths
In native suspension, water-bath 2h；Then it cools down, filters, obtain filter cake；Washing filter cake 5 times, then dries in 60 DEG C of baking ovens, grinds
Mill crosses 200 meshes to get material IV.
Material III is mixed with the ratio of 5:3 in mass ratio of material IV, obtains finished medicament.
The confection that mass ratio is 10% is added in the heavy metal tailings pollution place of Guangxi, by contaminated soil and medicine
After agent is sufficiently mixed, by natural aging, in the place after reparation, the leaching of lead reduces by 85%, and the leaching of zinc reduces by 71%, copper
Leaching reduces by 82%, and the contaminated soil content of organic matter after reparation increases by 35%, and soil pH value is unchanged, and place can be used as planting soil
Earth uses.
Embodiment 3
It advanced optimizes on the basis of embodiment 1.
Rice husk, chicken manure and bone meal are mixed according to the ratio of 6:2:2, prepare resulting mixture I.Mixture I is put into fixation
Bed pyrolysis oven, after being passed through nitrogen displacement atmosphere, startup power supply, control voltage is 200V, and heating rate control is 20 DEG C/min,
Heating furnace body temperature synchronizes in heating process to 350 DEG C or so and is passed through carbon dioxide, and pressure carbon dioxide is maintained at 0.08MPa/
S, makes material enter pyrolysis state, and retention time 5h obtains material II.Material II is dried to moisture content in 80 DEG C of baking oven
It is 8%, the ratio for being 5% according to mass ratio places into 10% ferrous sulfate solution after impregnating 24 hours in 5% acetic acid solution
It impregnates 24 hours, obtains material III.
Weigh that 10g chitosan is dissolved in 5% acetum and until solution is transparent it is poly- that 15% shell is made in stir about 2h
Sugar juice；It weighs a certain amount of bentonite to add water and stir, is configured to the suspension of 20% concentration；In 60 DEG C of water-baths, to bentonite
1 mL ethylenediamine is slowly added in suspension, it is stirring while adding；Slowly chitosan solution is added drop-wise in 90 DEG C of water-baths swollen
Moisten in native suspension, water-bath 3h；Then it cools down, filters, obtain filter cake；Washing filter cake 5 times, is then dried in 80 DEG C of baking ovens,
Grinding crosses 200 meshes to get material IV.
Material III is mixed with the ratio of 4:2 in mass ratio of material IV, obtains finished medicament.
The confection that mass ratio is 5% is added in the heavy metal tailings pollution place of Hunan, by contaminated soil and medicament
After being sufficiently mixed, by natural aging, in the place after reparation, the leaching of lead reduces by 92%, and the leaching of zinc reduces by 76%, the leaching of copper
88% is reduced out, and the contaminated soil content of organic matter after reparation increases by 40%, and soil pH value is unchanged, and place can be used as planting soil
It uses.
Embodiment 4
It advanced optimizes on the basis of embodiment 1.
Rice husk, chicken manure and bone meal are mixed according to the ratio of 8:1:1, prepare resulting mixture I.Mixture I is put into fixation
Bed pyrolysis oven, after being passed through nitrogen displacement atmosphere, startup power supply, control voltage is 180V, and heating rate control is 10 DEG C/min,
Heating furnace body temperature synchronizes in heating process to 300 DEG C or so and is passed through carbon dioxide, and pressure carbon dioxide is maintained at 0.05MPa/
S, makes material enter pyrolysis state, and retention time 3h obtains material II.Material II is dried to moisture content in 80 DEG C of baking oven
It is 8%, the ratio for being 5% according to mass ratio places into 10% ferrous sulfate solution after impregnating 24 hours in 5% acetic acid solution
It impregnates 24 hours, obtains material III.
Weigh that 8g chitosan is dissolved in 5% acetum and until solution is transparent 12% chitosan is made in stir about 2h
Solution；It weighs a certain amount of bentonite to add water and stir, is configured to the suspension of 20% concentration；It is outstanding to bentonite in 70 DEG C of water-baths
2mL ethylenediamine is slowly added in turbid, it is stirring while adding；Chitosan solution is slowly added drop-wise to bentonite in 85 DEG C of water-baths
In suspension, water-bath 2h；Then it cools down, filters, obtain filter cake；Washing filter cake 3 times, is then dried in 90 DEG C of baking ovens, is ground,
200 meshes are crossed to get material IV.
Material III is mixed with the ratio of 5:1 in mass ratio of material IV, obtains finished medicament.
The confection that mass ratio is 8.5% is added in the heavy metal tailings pollution place of Gansu, by contaminated soil and medicine
After agent is sufficiently mixed, by natural aging, in the place after reparation, the leaching of lead reduces by 94%, and the leaching of zinc reduces by 73%, copper
Leaching reduces by 90%, and the contaminated soil content of organic matter after reparation increases by 35%, and soil pH value is unchanged, and place can be used as planting soil
Earth uses.
Claims (2)
1. a kind of restoration of the ecosystem medicament of tailing heavy-metal contaminated soil, it is characterised in that: the restoration of the ecosystem medicament is by material
III mixes with material IV；The material III is using rice husk, chicken manure and bone meal as raw material, by being pyrolyzed, activating preparation after mixing
Gained；The material IV is that the filter cake being obtained by filtration after being mixed by chitosan solution with medicinal bentonite suspension passes through processing gained；
The preparation method of the material III the following steps are included:
A, raw material proportioning: rice husk, chicken manure and bone meal are mixed according to 5 ~ 8:1 ~ 3:1 ~ 2 mass ratio, prepare resulting mixture I；
B, be pyrolyzed: mixture I is put into fixed-bed pyrolysis furnace, be passed through nitrogen displacement atmosphere, startup power supply, control voltage be 180 ~
200V, heating rate control are 10 ~ 30 DEG C/min, and heating furnace body temperature synchronizes in heating process to 300 ~ 400 DEG C and is passed through two
Carbonoxide, carbon dioxide are maintained at 0.05 ~ 0.1MPa/s, and material is made to enter pyrolysis state, and the retention time is 3 ~ 5h, obtain material
Ⅱ；
C, activate: it is 10% hereinafter, in 4% ~ 6% acetic acid solution that material II is dried to moisture content in 80 ~ 100 DEG C of baking oven
It places into 8% ~ 12% ferrous sulfate solution and impregnates 18 ~ 30 hours after impregnating 18 ~ 30 hours, obtain material III；
The preparation method of the material IV the following steps are included:
A, it weighs 1 ~ 10g chitosan and is dissolved in 4% ~ 6% acetum and stirs 2 ~ 3h, until solution is transparent, it is made 10% ~
15% chitosan solution；
B, bentonite is added water and stirred, is configured to the suspension of 20 ~ 30% concentration；It is suspended to bentonite in 60 ~ 80 DEG C of water-baths
1 ~ 2mL ethylenediamine is added in liquid, it is stirring while adding；
C, chitosan solution is added drop-wise in medicinal bentonite suspension in 80 ~ 100 DEG C of water-baths, 2 ~ 3h of water-bath, cooling, filtering obtains
To filter cake；
D, it washes filter cake 3 ~ 5 times, is then dried in 60 ~ 100 DEG C of baking ovens, ground, cross 200 meshes to get material IV；
The restoration of the ecosystem medicament is mixed by material III with material IV to be mixed according to mass ratio 3 ~ 5:1 ~ 3.
2. the application method of restoration of the ecosystem medicament described in claim 1, it is characterised in that: add in tailing heavy metal pollution place
Adding mass ratio is 5%~10% restoration of the ecosystem medicament, after contaminated soil and medicament are sufficiently mixed, natural aging.
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| CN107794052B (en) * | 2017-11-08 | 2018-07-24 | 南昌工程学院 | Heavy metal pollution of soil renovation agent containing lignin charcoal and the preparation method and application thereof |
| CN108144955B (en) * | 2017-12-31 | 2021-02-12 | 佛山市南海区会斌金属贸易有限公司 | Processing device and preparation method of soil environment-friendly ecological restoration material |
| CN108148600A (en) * | 2018-02-02 | 2018-06-12 | 中国科学院生态环境研究中心 | A kind of method that gelatin solid waste prepares soil conditioner |
| CN110423621A (en) * | 2019-07-25 | 2019-11-08 | 中国林业科学研究院亚热带林业研究所 | A kind of biomass composite, preparation method and its application |
| CN113426818A (en) * | 2021-07-02 | 2021-09-24 | 昆明理工大学 | Method for fixing heavy metal by adding lime powder after pyrolysis of tailings |
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