CN117625199A - Non-ferrous metal mining area soil solidification stabilization restoration agent and application method thereof - Google Patents
Non-ferrous metal mining area soil solidification stabilization restoration agent and application method thereof Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 63
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 41
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 30
- 239000002184 metal Substances 0.000 title claims abstract description 30
- 238000005065 mining Methods 0.000 title claims abstract description 29
- 238000007711 solidification Methods 0.000 title claims abstract description 22
- 230000008023 solidification Effects 0.000 title claims abstract description 22
- 230000006641 stabilisation Effects 0.000 title claims abstract description 22
- 238000011105 stabilization Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 18
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 38
- 239000002245 particle Substances 0.000 claims abstract description 27
- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims abstract description 24
- 235000019796 monopotassium phosphate Nutrition 0.000 claims abstract description 24
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000001103 potassium chloride Substances 0.000 claims abstract description 19
- 235000011164 potassium chloride Nutrition 0.000 claims abstract description 19
- 239000010881 fly ash Substances 0.000 claims abstract description 18
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 claims abstract description 12
- LWIHDJKSTIGBAC-UHFFFAOYSA-K potassium phosphate Substances [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims description 33
- 238000002156 mixing Methods 0.000 claims description 20
- 238000002360 preparation method Methods 0.000 claims description 16
- 239000004568 cement Substances 0.000 claims description 12
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 claims description 12
- 230000032683 aging Effects 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 11
- 238000005067 remediation Methods 0.000 claims description 11
- 238000010000 carbonizing Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 238000000227 grinding Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 235000007164 Oryza sativa Nutrition 0.000 claims description 8
- 239000003814 drug Substances 0.000 claims description 8
- 235000009566 rice Nutrition 0.000 claims description 8
- 239000012286 potassium permanganate Substances 0.000 claims description 5
- 230000008439 repair process Effects 0.000 claims description 5
- 238000007873 sieving Methods 0.000 claims description 5
- 238000005245 sintering Methods 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 239000004094 surface-active agent Substances 0.000 claims description 5
- 240000007594 Oryza sativa Species 0.000 claims 1
- 238000005507 spraying Methods 0.000 claims 1
- 238000009736 wetting Methods 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 9
- 239000003381 stabilizer Substances 0.000 abstract description 7
- 239000002699 waste material Substances 0.000 abstract description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052782 aluminium Inorganic materials 0.000 abstract description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 5
- 239000011574 phosphorus Substances 0.000 abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 5
- 238000001179 sorption measurement Methods 0.000 abstract description 4
- 229910001570 bauxite Inorganic materials 0.000 abstract description 3
- 230000009471 action Effects 0.000 abstract description 2
- 239000002440 industrial waste Substances 0.000 abstract description 2
- 238000007670 refining Methods 0.000 abstract 1
- 229910001385 heavy metal Inorganic materials 0.000 description 35
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 13
- 229910052725 zinc Inorganic materials 0.000 description 13
- 239000011701 zinc Substances 0.000 description 13
- 150000002500 ions Chemical class 0.000 description 9
- 241000196324 Embryophyta Species 0.000 description 7
- 241000209094 Oryza Species 0.000 description 7
- JQJCSZOEVBFDKO-UHFFFAOYSA-N lead zinc Chemical compound [Zn].[Pb] JQJCSZOEVBFDKO-UHFFFAOYSA-N 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- 150000004645 aluminates Chemical class 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 241001412627 Adenophora liliifolia Species 0.000 description 1
- 241001093951 Ailanthus altissima Species 0.000 description 1
- 235000001405 Artemisia annua Nutrition 0.000 description 1
- 240000000011 Artemisia annua Species 0.000 description 1
- 241000123850 Aster ageratoides Species 0.000 description 1
- 239000002028 Biomass Substances 0.000 description 1
- 244000241257 Cucumis melo Species 0.000 description 1
- 235000015510 Cucumis melo subsp melo Nutrition 0.000 description 1
- 244000179525 Dracocephalum moldavica Species 0.000 description 1
- 240000008375 Hymenaea courbaril Species 0.000 description 1
- 240000008436 Ipomoea aquatica Species 0.000 description 1
- 241000522169 Lespedeza Species 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 235000001601 Sabal palmetto Nutrition 0.000 description 1
- 241000124844 Sedum alfredii Species 0.000 description 1
- 235000010086 Setaria viridis var. viridis Nutrition 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 241001106462 Ulmus Species 0.000 description 1
- FJJCIZWZNKZHII-UHFFFAOYSA-N [4,6-bis(cyanoamino)-1,3,5-triazin-2-yl]cyanamide Chemical compound N#CNC1=NC(NC#N)=NC(NC#N)=N1 FJJCIZWZNKZHII-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 244000230342 green foxtail Species 0.000 description 1
- 230000012010 growth Effects 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000004181 pedogenesis Methods 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- MQMHJMFHCMWGNS-UHFFFAOYSA-N phosphanylidynemanganese Chemical compound [Mn]#P MQMHJMFHCMWGNS-UHFFFAOYSA-N 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 239000002373 plant growth inhibitor Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 239000010926 waste battery Substances 0.000 description 1
- 210000000051 wattle Anatomy 0.000 description 1
- 229940045860 white wax Drugs 0.000 description 1
Classifications
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- 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
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/08—Aluminium compounds, e.g. aluminium hydroxide
-
- 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
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/04—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only applied in a physical form other than a solution or a grout, e.g. as granules or gases
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses a non-ferrous metal mining area soil solidification stabilization restoration agent and a use method thereof, wherein the agent is prepared from monopotassium phosphate, potassium chloride, red mud particles, fly ash and modified biochar, waste red mud generated after industrial waste fly ash and bauxite are used for refining aluminum is used as main substances, and the biochar-loaded monopotassium phosphate and potassium chloride stabilizer are compounded to prepare the restoration agent, so that the resource utilization rate is improved, namely, the strong adsorption performance of the red mud is reserved, OH-can be slowly released, the phosphorus-manganese-modified biochar is loaded with the stabilizer and then mixed with the red mud particles to prepare the restoration agent, and effective phosphorus can be slowly released under the action of the red mud, so that the phosphorus loss of the agent is reduced, and the prepared agent can permanently restore non-ferrous metal polluted soil, thereby improving the restoration efficiency and reducing the restoration cost.
Description
Technical Field
The invention belongs to the field of soil remediation, and particularly relates to a non-ferrous metal mining area soil solidification stabilization remediation agent and a preparation method thereof.
Background
Soil is one of the main natural resources that humans depend on to survive, and is also an important component of the human ecological environment. With the rapid development of modern industry, the influence of various heavy metals, especially heavy metals such as lead, zinc, cadmium and the like, on the soil is increasing. The sources of heavy metals in soil mainly comprise two aspects, namely a natural source; secondly, the artificial source. The natural source is the heavy metal contained in the soil matrix in the process of rock and soil formation, and the heavy metal content is low under the condition that the harm to the surrounding environment and organisms is small; the artificial source mainly refers to the emission of heavy metal pollution generated in the processes of three wastes, such as smelting, mining, metal processing, chemical industry, waste battery treatment, electronic, tanning, dye and the like, automobile exhaust emission, pesticide and chemical fertilizer application and the like, the pollution degree is serious, and the harm to the surrounding environment and organisms is large. The artificial sources of heavy metals in the soil are mainly described below.
Currently, the soil remediation of lead-zinc mining areas mainly depends on physical methods, chemical methods, biological remediation, phytoremediation and the like. For example, chinese patent No. CN201710035348.8 discloses a method for repairing heavy metal pollution in lead-zinc mining area, specifically, investigation is performed on soil samples in heavy metal pollution areas, plants with enrichment capability for heavy metals are planted on heavy metal pollution areas, when plants grow to a growing period, plant growth inhibitors are sprayed on the heavy metal pollution areas, when plants grow to a mature period, heavy metal pollution repair promoters are sprayed on the heavy metal pollution areas, and harvesting is performed in a plant aging period, so that heavy metal pollution is removed. The plant with heavy metal enrichment capability is planting green bristlegrass, wattle, root of straight ladybell, aster ageratoides, sedum alfredii, locust tree, ailanthus altissima, elm, ground tip melon, moldavica dragonhead, white wax of small leaf, swamp cabbage, artemisia annua, locust leg, broad leaf lespedeza, and can be recommended as ecological restoration plant in lead-zinc mining area for standby. However, the phytoremediation method is costly and long-lasting.
The solidifying/stabilizing technology is to add a stabilizing solidifying agent into the soil to passivate pollutants in the soil so as to reduce the toxicity or migration of the pollutants; or the soil is solidified into a large block, so that the contact area of the polluted soil and the external environment is reduced, and the migration of pollutants into the environment is reduced, thereby reducing the bioavailability and the harm to animals and plants, and ensuring the environmental safety of the resource utilization in the field after the restoration. The development of the efficient, economical and environment-friendly lead-zinc mining area soil solidification stabilization restoration agent has important practical significance.
Disclosure of Invention
Aiming at the problem of long period in the existing non-ferrous metal mining area soil remediation, the invention provides the non-ferrous metal mining area soil solidification stabilization remediation agent and the preparation method thereof, and the non-ferrous metal heavy metals in the solidified soil are stabilized by the natural agent, so that the remediation period is shortened.
The invention is realized by the following technical scheme:
the non-ferrous metal mining area soil solidification stabilization restoration agent comprises the following components in parts by weight:
5-10 parts of monopotassium phosphate, 5-10 parts of potassium chloride, 30-40 parts of red mud particles, 40-60 parts of fly ash and 25-30 parts of modified biochar.
The preparation method of the red mud particles comprises the following steps:
(1) Taking a red mud raw material prepared by a Bayer-sintering combined method, grinding and sieving with a 200-mesh sieve;
(2) Mixing the ground red mud raw materials with water according to a water-cement ratio of 1:2 to obtain a mixture, adding cement accounting for 5% of the total mass of the mixture and a surfactant OP accounting for 0.1%, uniformly mixing, and granulating by a rotary drum granulator to obtain red mud particles.
The preparation method of the modified biochar comprises the following steps:
(1) Carbonizing rice hulls in a carbonizing machine at 400-450 deg.c for 3-6 hr to obtain original biochar;
(2) Taking raw biochar, adding 0.2mol/L potassium permanganate solution until the raw biochar is completely wet, and aging for 12 hours at 30 ℃;
(3) Drying the aged biochar at 100 ℃, cooling to room temperature, adding 0.3mol/L potassium dihydrogen phosphate solution until the biochar is completely wetted, aging for 12 hours at 30 ℃, drying at 100 ℃, cooling to room temperature, and grinding to obtain the modified biochar.
Preferably, the dosage ratio of the red mud particles to the fly ash is (2-3): 3-5.
Preferably, the dosage of the monopotassium phosphate and the potassium chloride is 4% -6% of that of the modified biochar.
The invention adopts waste red mud generated after the aluminum is extracted from the fly ash and the bauxite as a main substance, and prepares the repairing medicament by compounding the biochar-loaded potassium dihydrogen phosphate and the potassium chloride stabilizer. Although the red mud for restoring heavy metal polluted soil can reduce the effective heavy metal lead and zinc in the polluted soil, the red mud with extremely strong alkalinity is not suitable for restoring farmland soil or soil with crop growth, and the invention modifies the red mud into coated particles by adding cement to lead OH - Recombination in the lattice or lattice spacing, thereby enabling slow release of OH - Promote the chemical form transformation and biological absorption passivation of heavy metals lead and zinc in the polluted soil with stable transformation. Meanwhile, the cement can also reduce the effective heavy metals lead and zinc in the soil. The biochar modified by the phosphorus and the manganese not only can passivate heavy metals such as lead and zinc in soil, but also can load more stabilizing agents such as monopotassium phosphate and potassium chloride in the porous structure, so that the medicament provided by the invention has a better stabilizing effect on heavy metal nonferrous metals. The potassium dihydrogen phosphate and the potassium chloride have very remarkable stabilizing effect on heavy metals lead and zinc in waste residues, and when the addition amount reaches or exceeds a certain value, the leaching concentration of the heavy metals is slowly reduced and is not greatly changed, and the invention is found by researchWhen the usage amount of the monopotassium phosphate and the potassium chloride is 4% -6% of that of the modified biochar, the maximum load can be achieved, and meanwhile heavy metal lead and zinc in the soil can be stabilized to the greatest extent.
The invention also provides a preparation method of the non-ferrous metal mining area soil solidification stabilization restoration agent, which comprises the following steps:
(1) Uniformly mixing potassium dihydrogen phosphate, red mud particles and fly ash according to the weight part ratio to obtain a mixture a;
(2) Adding potassium chloride into the modified biochar according to the weight part ratio, and soaking for 6-10 hours to obtain a mixture b;
(3) And (3) uniformly mixing the mixture a and the mixture b at the speed of 60-100r/min, and then delivering the mixture to a rotary drum granulator for granulating to obtain the repairing medicament.
The monopotassium phosphate and the potassium chloride are used as inorganic salts, and can form stable complex with heavy metal ions in soil, so that the activity of the heavy metal ions is reduced, and the pollution of the heavy metal ions to the environment is reduced. The red mud particles are waste generated after bauxite refines aluminum, contain rich elements such as silicon, aluminum and the like, and can form stable silicate or aluminate with heavy metal ions in soil, so that the heavy metal ions are fixed, and the pollution to the environment is reduced. The fly ash is waste generated in the coal-fired power generation process, contains rich elements such as silicon, aluminum and the like, and can form stable silicate or aluminate with heavy metal ions in soil, so that the heavy metal ions are fixed, and the pollution to the environment is reduced. The modified biochar is obtained by treating biomass through a specific method, has good adsorption performance and stability, and can effectively adsorb heavy metal ions in soil, so that the pollution of the heavy metal ions to the environment is reduced.
Meanwhile, the invention also provides a use method of the non-ferrous metal mining area soil solidification stabilization restoration agent, 300-500kg of the restoration agent is applied to each mu of soil, and then water is sprayed to keep 1-2cm of soil ponding and moistened for 10-20d.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, industrial waste red mud and fly ash are used as raw materials for preparing the repairing agent, so that the resource utilization rate is improved, the strong adsorption performance of the red mud is maintained, the OH < - > can be slowly released, the phosphorus-manganese modified biochar is loaded with the stabilizer and then mixed with red mud particles to prepare the repairing agent, and effective phosphorus can be slowly released under the action of the red mud, so that the phosphorus loss of the agent is reduced, and the prepared agent can be used for repairing nonferrous metal polluted soil for a long time, so that the repairing efficiency is improved, and the repairing cost is reduced.
2. The repairing agent prepared by the invention utilizes the biochar to load the metal stabilizing agent, utilizes the porous performance of the biochar to load more stabilizing agent in the agent, and simultaneously utilizes the porous performance of the biochar and the fly ash to combine the adsorption performance of the red mud, thereby realizing the slow release performance of the agent and ensuring that the agent has lasting repairing performance.
Detailed Description
The present invention will be further described with reference to the following examples, in which all technical means used are conventional technical means in the art unless specifically stated otherwise.
Example 1
The non-ferrous metal mining area soil solidification stabilization restoration agent comprises the following components in parts by weight:
5 parts of monopotassium phosphate, 5 parts of potassium chloride, 30 parts of red mud particles, 40 parts of fly ash and 25 parts of modified biochar.
The preparation method of the red mud particles comprises the following steps:
(1) Taking a red mud raw material prepared by a Bayer-sintering combined method, grinding and sieving with a 200-mesh sieve;
(2) Mixing the ground red mud raw materials with water according to a water-cement ratio of 1:2 to obtain a mixture, adding cement accounting for 5% of the total mass of the mixture and a surfactant OP accounting for 0.1%, uniformly mixing, and granulating by a rotary drum granulator to obtain red mud particles.
The preparation method of the modified biochar comprises the following steps:
(1) Taking rice hulls, putting the rice hulls into a carbonizing machine, carbonizing for 6 hours at 400 ℃ to obtain raw biochar;
(2) Taking raw biochar, adding 0.2mol/L potassium permanganate solution until the raw biochar is completely wet, and aging for 12 hours at 30 ℃;
(3) Drying the aged biochar at 100 ℃, cooling to room temperature, adding 0.3mol/L potassium dihydrogen phosphate solution until the biochar is completely wetted, aging for 12 hours at 30 ℃, drying at 100 ℃, cooling to room temperature, and grinding to obtain the modified biochar.
The preparation method of the non-ferrous metal mining area soil solidification stabilization restoration agent comprises the following steps:
(1) Uniformly mixing potassium dihydrogen phosphate, red mud particles and fly ash according to the weight part ratio to obtain a mixture a;
(2) Adding potassium chloride into the modified biochar according to the weight part ratio, and soaking for 6 hours to obtain a mixture b;
(3) And (3) uniformly mixing the mixture a and the mixture b at 60r/min, and then delivering to a rotary drum granulator for granulating to obtain the repairing medicament.
Example 2
The non-ferrous metal mining area soil solidification stabilization restoration agent comprises the following components in parts by weight:
10 parts of monopotassium phosphate, 10 parts of potassium chloride, 40 parts of red mud particles, 60 parts of fly ash and 30 parts of modified biochar.
The preparation method of the red mud particles comprises the following steps:
(1) Taking a red mud raw material prepared by a Bayer-sintering combined method, grinding and sieving with a 200-mesh sieve;
(2) Mixing the ground red mud raw materials with water according to a water-cement ratio of 1:2 to obtain a mixture, adding cement accounting for 5% of the total mass of the mixture and a surfactant OP accounting for 0.1%, uniformly mixing, and granulating by a rotary drum granulator to obtain red mud particles.
The preparation method of the modified biochar comprises the following steps:
(1) Taking rice hulls, putting the rice hulls into a carbonizing machine, carbonizing for 3 hours at 450 ℃ to obtain raw biochar;
(2) Taking raw biochar, adding 0.2mol/L potassium permanganate solution until the raw biochar is completely wet, and aging for 12 hours at 30 ℃;
(3) Drying the aged biochar at 100 ℃, cooling to room temperature, adding 0.3mol/L potassium dihydrogen phosphate solution until the biochar is completely wetted, aging for 12 hours at 30 ℃, drying at 100 ℃, cooling to room temperature, and grinding to obtain the modified biochar.
The preparation method of the non-ferrous metal mining area soil solidification stabilization restoration agent comprises the following steps:
(1) Uniformly mixing potassium dihydrogen phosphate, red mud particles and fly ash according to the weight part ratio to obtain a mixture a;
(2) Adding potassium chloride into the modified biochar according to the weight part ratio, and soaking for 10 hours to obtain a mixture b;
(3) And (3) uniformly mixing the mixture a and the mixture b at 100r/min, and then delivering to a rotary drum granulator for granulating to obtain the repairing medicament.
Example 3
The non-ferrous metal mining area soil solidification stabilization restoration agent comprises the following components in parts by weight:
8 parts of monopotassium phosphate, 8 parts of potassium chloride, 35 parts of red mud particles, 45 parts of fly ash and 28 parts of modified biochar.
The preparation method of the red mud particles comprises the following steps:
(1) Taking a red mud raw material prepared by a Bayer-sintering combined method, grinding and sieving with a 200-mesh sieve;
(2) Mixing the ground red mud raw materials with water according to a water-cement ratio of 1:2 to obtain a mixture, adding cement accounting for 5% of the total mass of the mixture and a surfactant OP accounting for 0.1%, uniformly mixing, and granulating by a rotary drum granulator to obtain red mud particles.
The preparation method of the modified biochar comprises the following steps:
(1) Taking rice hulls, putting the rice hulls into a carbonizing machine, carbonizing for 5 hours at 420 ℃ to obtain raw biochar;
(2) Taking raw biochar, adding 0.2mol/L potassium permanganate solution until the raw biochar is completely wet, and aging for 12 hours at 30 ℃;
(3) Drying the aged biochar at 100 ℃, cooling to room temperature, adding 0.3mol/L potassium dihydrogen phosphate solution until the biochar is completely wetted, aging for 12 hours at 30 ℃, drying at 100 ℃, cooling to room temperature, and grinding to obtain the modified biochar.
The preparation method of the non-ferrous metal mining area soil solidification stabilization restoration agent comprises the following steps:
(1) Uniformly mixing potassium dihydrogen phosphate, red mud particles and fly ash according to the weight part ratio to obtain a mixture a;
(2) Adding potassium chloride into the modified biochar according to the weight part ratio, and soaking for 8 hours to obtain a mixture b;
(3) And (3) uniformly mixing the mixture a and the mixture b at 80r/min, and then delivering to a rotary drum granulator for granulating to obtain the repairing medicament.
Application example
Selecting nonferrous metal mining areas in a county, wherein the geographical coordinates of the mining areas are as follows: east longitude 107 DEG 36 '20' -107 DEG 37 '32'; the chemical morphology content of lead and zinc in the soil detected by 24 degrees 51 '55' -24 degrees 52 '50' in North latitude is shown in table 1. After the soil to be tested is ploughed, 500kg of the repair agent prepared in the example 3 is applied per mu, and then water is sprayed to keep the soil to accumulate water for 1cm and wet for 20d. Soil samples were taken at 60 days and 90 days during the repair period to determine the pH value and the lead and zinc contents of each form, and the results are shown in Table 2.
Table 1: the content of each chemical form of lead and zinc in the tested soil (mg/kg)
Table 2: the lead and zinc chemical form contents (mg/kg) of the tested soil in the repairing period of 60 days and 90 days
Comparing the data in tables 1 and 2, it can be seen that after the non-ferrous metal contaminated soil is restored for 90 days by using the agent prepared in example 3 of the present invention, the ion-exchanged lead and zinc in the soil are significantly reduced, i.e. the agent of the present invention can effectively reduce the content of mobilizable lead and zinc in the soil.
The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, the scope of which is defined by the claims. Various modifications and equivalent arrangements of parts may be made to the present invention within the spirit and scope of the invention, and such modifications and equivalents should be considered to fall within the scope of the invention.
Claims (7)
1. A non-ferrous metal mining area soil solidification stabilization restoration medicament is characterized in that: the composition comprises the following components in parts by weight:
5-10 parts of monopotassium phosphate, 5-10 parts of potassium chloride, 30-40 parts of red mud particles, 40-60 parts of fly ash and 25-30 parts of modified biochar.
2. The non-ferrous metal mining area soil solidification stabilization remediation agent of claim 1, wherein: the preparation method of the red mud particles comprises the following steps:
(1) Taking a red mud raw material prepared by a Bayer-sintering combined method, grinding and sieving with a 200-mesh sieve;
(2) Mixing the ground red mud raw materials with water according to a water-cement ratio of 1:2 to obtain a mixture, adding cement accounting for 5% of the total mass of the mixture and a surfactant OP accounting for 0.1%, uniformly mixing, and granulating by a rotary drum granulator to obtain red mud particles.
3. The non-ferrous metal mining area soil solidification stabilization remediation agent of claim 1, wherein: the preparation method of the modified biochar comprises the following steps:
(1) Carbonizing rice hulls in a carbonizing machine at 400-450 deg.c for 3-6 hr to obtain original biochar;
(2) Taking raw biochar, adding 0.2mol/L potassium permanganate solution until the raw biochar is completely wet, and aging for 12 hours at 30 ℃;
(3) Drying the aged biochar at 100 ℃, cooling to room temperature, adding 0.3mol/L potassium dihydrogen phosphate solution until the biochar is completely wetted, aging for 12 hours at 30 ℃, drying at 100 ℃, cooling to room temperature, and grinding to obtain the modified biochar.
4. The non-ferrous metal mining area soil solidification stabilization remediation agent of claim 1, wherein: the dosage ratio of the red mud particles to the fly ash is (2-3) to (3-5).
5. The non-ferrous metal mining area soil solidification stabilization remediation agent of claim 1, wherein: the dosage of the monopotassium phosphate and the potassium chloride is 4-6% of that of the modified biochar.
6. The method for preparing the non-ferrous metal mining area soil solidification stabilization repair agent according to any one of claims 1 to 5, comprising the steps of:
(1) Uniformly mixing potassium dihydrogen phosphate, red mud particles and fly ash according to the weight part ratio to obtain a mixture a;
(2) Adding potassium chloride into the modified biochar according to the weight part ratio, and soaking for 6-10 hours to obtain a mixture b;
(3) And (3) uniformly mixing the mixture a and the mixture b at the speed of 60-100r/min, and then delivering the mixture to a rotary drum granulator for granulating to obtain the repairing medicament.
7. The method for using the non-ferrous metal mining area soil solidification stabilization repair agent according to any one of claims 1 to 5, wherein: applying 300-500kg of the repairing agent to each mu of soil, and then spraying water to keep the soil water for 1-2cm and wetting for 10-20d.
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