WO2017173737A1 - Stabilizing agent for treating chromium contaminated soil and application thereof - Google Patents

Stabilizing agent for treating chromium contaminated soil and application thereof Download PDF

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Publication number
WO2017173737A1
WO2017173737A1 PCT/CN2016/087207 CN2016087207W WO2017173737A1 WO 2017173737 A1 WO2017173737 A1 WO 2017173737A1 CN 2016087207 W CN2016087207 W CN 2016087207W WO 2017173737 A1 WO2017173737 A1 WO 2017173737A1
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soil
agent
sodium
chromium
combination
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PCT/CN2016/087207
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French (fr)
Chinese (zh)
Inventor
李淑彩
吕正勇
魏丽
冯国杰
苗竹
朱湖地
范吉强
甄胜利
刘中良
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北京高能时代环境技术股份有限公司
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Publication of WO2017173737A1 publication Critical patent/WO2017173737A1/en
Priority to ZA201801876A priority Critical patent/ZA201801876B/en
Priority to AU2018100348A priority patent/AU2018100348A4/en

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    • 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
    • C09K17/08—Aluminium compounds, e.g. aluminium hydroxide
    • 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

Definitions

  • the invention belongs to the field of contaminated soil remediation, and particularly relates to a stabilizing agent for treating hexavalent chromium contaminated soil, waste residue and sludge, which stabilizes hexavalent chromium therein and reduces the migration and toxicity of hexavalent chromium.
  • hexavalent chromium is one of the most common pollutants that endanger the health of residents. Especially with the development of modern industrial production, the pollution of hexavalent chromium to the environment has become increasingly serious.
  • the main sources of hexavalent chromium pollution mainly include: (1) Unreasonable stacking of chromium-containing waste slag. (2) Unreasonable discharge of wastewater and sludge from tanning and electroplating enterprises.
  • Hexavalent chromium contaminants are highly mobile, highly toxic, and have strong oxidizing and corrosive properties. They have strong corrosive effects on human skin, causing skin burns and ulcers. Long-term intake can lead to sarcoma, squamous cell carcinoma, and adenocarcinoma. And other diseases; corneal damage will occur after eye contact; hexavalent chromium can enter the body through the digestive tract, respiratory tract or skin, leading to cell distortion and cancer. The hexavalent chromium in the polluted soil can contact with the dust and soil solution and enter the human body. Therefore, the hexavalent chromium contaminated soil is very harmful to human health and the environment. Environmental protection workers at home and abroad attach great importance to the treatment of hexavalent chromium contaminated soil. The treatment of hexavalent chromium contaminated soil is also one of the research hotspots of environmental protection researchers at home and abroad.
  • the techniques for repairing hexavalent chromium contaminated soil include soil leaching method, soil cleaning method, in situ chemical reduction method, microbial remediation method, and stabilization curing method.
  • soil leaching method soil cleaning method
  • in situ chemical reduction method microbial remediation method
  • stabilization curing method stabilization curing method.
  • more technologies are used as curing stabilization technology.
  • the hexavalent chromium-contaminated soil stabilized curing agent sold on the market is relatively expensive, and the soil structure damage is large after treatment, and the soil "compatibility ratio" after treatment is larger, both higher than 1.1.
  • the stabilized curing agent for treating hexavalent chromium contaminated soil is relatively expensive, and the soil structure damage is large after treatment, and the soil "compatibility ratio" after treatment is larger, all higher than 1.1.
  • the present invention provides a lower cost, stable curing effect, and "compatibilized” after treatment. Than a smaller agent and successfully applied it to the repair of chromium-contaminated soil.
  • the invention provides a stabilization agent for treating chromium contaminated soil, comprising: a crystal volume amplification agent, a precipitating agent, a flocculating agent and a pH adjusting agent;
  • the crystal volume amplification agent is one or a combination of cement or clay materials;
  • the precipitant is one or a combination of sulfide, polysulfide, sulfite or pyrosulfite.
  • the mass ratio of the crystal bulk amplifying agent, the flocculating agent and the precipitating agent is from 0.1 to 3:0.1 to 3:0.1 to 1.
  • the flocculating agent is one or a combination of a water-soluble aluminum salt or a sodium tetraborate;
  • the clay material is one or a combination of bentonite, kaolin, attapulgite or sepiolite.
  • the flocculating agent is one of or a combination of potassium aluminum sulfate, aluminum chloride, polyaluminum chloride or sodium tetraborate; the precipitating agent is sodium sulfide, sodium polysulfide, calcium sulfide, calcium polysulfide One or a combination of sodium sulfite or sodium metabisulfite.
  • the flocculating agent is a mixture of potassium sulfate and sodium tetraborate in a weight ratio of 1:0.8 to 1; the precipitating agent is a mixture of sodium sulfide and sodium sulfite in a weight ratio of 1:0.5 to 1.
  • the pH adjuster is alkaline and may be sodium hydroxide, calcium hydroxide, calcium oxide or the like.
  • the crystal volume amplification agent is a mixture of cement and bentonite in a weight ratio of 1:1.
  • the present invention provides a method for treating a chromium contaminated soil as described above, comprising the steps of:
  • the precipitating agent and the pH adjuster are formulated into an aqueous solution, added to the obtained mixture of the step (1), and the pH adjuster is adjusted to a pH of 6 to 9, stirred, and cured.
  • the mass percentage of the precipitating agent in the aqueous solution of the step (2) is from 1% to 10%, and the mass percent concentration of the pH adjusting agent is from 0.1 to 10%.
  • the curing time is from 1 to 10 days.
  • the stabilization agent for treating chromium-contaminated soil provided by the invention has lower cost and good stabilization and solidification effect (stabilization rate is above 90%), and the "compatibility ratio" after treatment of chromium-contaminated soil does not exceed 1.1, and Will not destroy the structure of the soil.
  • the soil samples were taken from a chromium-contaminated site in Hubei province.
  • the soil was leached by the method of solid waste leaching toxicity leaching method (HJ/T299-2007).
  • the leaching concentration of hexavalent chromium in the soil was 133.35 mg/L.
  • the tested soil was sieved to 1 cm, and 1% of bentonite with soil mass, 0.5% potassium aluminum sulfate and 0.5% sodium tetraborate of soil quality were added to the soil, and 40% of sodium sulfide and hydroxide were applied after uniform stirring.
  • Sodium sulphate, sodium sulphate, sodium hydroxide aqueous solution added sodium sulphate 1% of the soil mass, sodium hydroxide added to the soil mass of 0.5% (the pH of the chromium contaminated soil is adjusted to 8), curing for 6 days
  • the leaching concentration of hexavalent chromium in the soil after the treatment was 11.30 mg/L, and the stabilization rate of the hexavalent chromium in the soil was 91.52%.
  • the "compatibilization ratio" of the treated soil was 1.03.
  • the tested soil was sieved to 1 cm, and 1% of bentonite with soil mass, 0.5% potassium aluminum sulfate and 0.5% sodium tetraborate of soil quality were added to the soil, and 40% of sodium sulfide and hydroxide were applied after uniform stirring.
  • Sodium sulphate, sodium sulphide, sodium hydroxide solution in sodium sulphate added 1% of the soil mass, sodium hydroxide added to the soil mass of 0.3% (the pH of the chromium contaminated soil is adjusted to 7), curing for 6 days
  • the leaching concentration of hexavalent chromium in the soil after the treatment was 7.27 mg/L, and the stabilization rate of the hexavalent chromium in the soil was 94.55%.
  • the "compatibilization ratio" of the treated soil was 1.03.
  • the tested soil was sieved to 1 cm, and 1% of bentonite with soil mass, 0.5% potassium aluminum sulfate and 0.5% sodium tetraborate of soil quality were added to the soil, and 40% of sodium sulfide and hydroxide were applied after uniform stirring.
  • the soil to be tested was passed through a 1 cm sieve, and 1% of cement with soil mass, 0.5% of potassium sulfate and 0.5% of sodium tetraborate of soil quality were added to the soil, and 40% of sodium sulfide and hydroxide were applied after uniformly stirring.
  • the tested soil was sieved to 1 cm, and the soil was added with 0.5% soil quality and 0.5% bentonite soil, 0.5% potassium aluminum sulfate and 0.5% sodium tetraborate soil.
  • the soil quality was evenly stirred after mixing 40. % sodium sulfide and sodium hydroxide aqueous solution, sodium sulfide, sodium hydroxide solution, sodium sulfide added to the soil mass of 1%, sodium hydroxide added to the soil mass of 0.3% (pH adjustment of chromium-contaminated soil) 7), after 6 days of curing, the leaching concentration of hexavalent chromium in the soil after the treatment was 4.84 mg/L, and the stabilization rate of the hexavalent chromium in the soil was 96.37%.
  • the "compatibility ratio" of the treated soil was 1.08.
  • the test soil was over 1cm sieve, adding 0.05% soil cement and soil quality 0.05% bentonite to soil, 0.05% aluminum sulfate potassium and 0.05% sodium tetraborate soil, and evenly stirred to apply soil quality 40 % sodium sulfide and sodium hydroxide aqueous solution, sodium sulfide, sodium hydroxide solution, sodium sulfide added to the soil mass of 1%, sodium hydroxide added to the soil mass of 0.3% (pH adjustment of chromium-contaminated soil) 7), after 6 days of curing, the leaching concentration of hexavalent chromium in the soil after the treatment was 8.26 mg/L, and the stability of the hexavalent chromium in the soil was 93.8%.
  • the "compatibility ratio" of the treated soil was 1.01.
  • test soil was passed through a sieve of 1 cm, and 0.15% soil cement and 0.15% bentonite were added to the soil, aluminum sulfate potassium having a soil quality of 0.15% and sodium tetraborate having a soil quality of 0.15% were uniformly stirred and soil quality was applied 40.
  • test soil was passed through a sieve of 1 cm, and 0.15% soil cement and 0.15% bentonite were added to the soil, aluminum sulfate potassium having a soil quality of 0.15% and sodium tetraborate having a soil quality of 0.15% were uniformly stirred and soil quality was applied 40.
  • the tested soil was sieved to 1 cm, and the soil was added with 0.5% soil cement and 0.5% bentonite soil, 0.5% potassium aluminum sulfate and 0.4% sodium tetraborate soil.
  • the soil quality was evenly stirred after mixing 40. % sodium sulfide and sodium hydroxide aqueous solution, sodium sulfide, sodium hydroxide solution, sodium sulfide added to the soil mass of 1%, sodium hydroxide added to the soil mass of 0.3% (pH adjustment of chromium-contaminated soil) 7), after 6 days of curing, the leaching concentration of hexavalent chromium in the soil after the treatment was 6.02 mg/L, and the stability of the hexavalent chromium in the soil was 95.5%.
  • the "compatibility ratio" of the treated soil was 1.05.
  • the tested soil was passed through a sieve of 1 cm, and 0.5% soil cement and 0.5% bentonite were added to the soil, and the soil quality was 1% potassium aluminum sulfate. After uniformly stirring, 40% sodium sulfide and sodium hydroxide aqueous solution were applied. The amount of sodium sulfide added to the sodium sulfide and sodium hydroxide aqueous solution accounts for 1% of the soil mass, and the amount of sodium hydroxide added accounts for 0.3% of the soil mass (the pH of the chromium-contaminated soil is adjusted to 7), and the curing is carried out for 6 days.
  • the leaching concentration of hexavalent chromium in the soil after treatment was 8.43 mg/L, and the stability of the hexavalent chromium in the soil was 93.7%.
  • the "compatibility ratio" of the treated soil was 1.08.
  • the tested soil was sieved to 1 cm, and the soil was added with 0.5% soil cement and 0.5% bentonite soil, 1% sodium tetraborate soil, and uniformly stirred to apply 40% sodium sulfide and sodium hydroxide aqueous solution.
  • the amount of sodium sulfide added to the sodium sulfide and sodium hydroxide aqueous solution accounts for 1% of the soil mass, and the amount of sodium hydroxide added accounts for 0.3% of the soil mass (the pH of the chromium-contaminated soil is adjusted to 7), and the curing is carried out for 6 days.
  • the leaching concentration of hexavalent chromium in the soil after treatment was 8.67 mg/L, and the stability of the hexavalent chromium in the soil was 93.5%.
  • the "compatibility ratio" of the treated soil was 1.08.
  • the tested soil was sieved to 1 cm, and the soil was added with 0.5% soil quality and 0.5% kaolin soil, 0.5% aluminum chloride and 0.5% aluminum sulfate. After even mixing, the soil quality was 40%.
  • the sodium sulfite and sodium hydroxide aqueous solution, the sodium sulfite solution in sodium sulfite and sodium hydroxide solution accounted for 1% of the soil mass, and the sodium hydroxide added amounted to 0.3% of the soil mass (the pH of the chromium-contaminated soil was adjusted to 7).
  • the leaching concentration of hexavalent chromium in the soil after the treatment was 7.42 mg/L, and the stability of the hexavalent chromium in the soil was 94.43%.
  • the "compatibility ratio" of the treated soil was 1.05.
  • the tested soil was sieved to 1 cm, and the soil was added with 0.5% soil quality and 0.5% bentonite soil, 0.5% potassium aluminum sulfate and 0.5% sodium tetraborate soil.
  • the soil quality was evenly stirred after mixing 40. % sodium sulfide, sodium sulfite and sodium hydroxide aqueous solution, sodium sulfide, sodium sulfite and sodium hydroxide aqueous solution added to the amount of sodium sulfide 0.5% of the soil mass, sodium sulfite added 0.5% of the soil mass, sodium hydroxide added
  • the amount accounts for 0.3% of the soil quality (the pH of the chromium-contaminated soil is adjusted to 7), and the leaching concentration of hexavalent chromium in the soil after treatment is 3.56 mg/L.
  • the stability of the agent to the hexavalent chromium in the soil The rate of conversion was 97.33%.
  • the "compatibility ratio" of the treated soil was 1.02.
  • the tested soil was sieved to 1 cm, and the soil was added with 0.5% soil quality and 0.5% bentonite soil, 0.5% potassium aluminum sulfate and 0.5% sodium tetraborate soil.
  • the soil quality was evenly stirred after mixing 40. % sodium sulfide, sodium sulfite and sodium hydroxide aqueous solution, sodium sulfide, sodium sulfite and sodium hydroxide aqueous solution in the amount of sodium sulfide added to the soil mass of 0.6%, sodium sulfite added to the soil mass of 0.3%, the addition of sodium hydroxide
  • the amount is 0.3% of the soil quality (the pH of the chromium-contaminated soil is adjusted to 7), and the leaching concentration of hexavalent chromium in the soil after the treatment is 3.87 mg/L.
  • the stability of the agent to the hexavalent chromium in the soil The rate of conversion was 97.0%.
  • the "compatibility ratio" of the treated soil
  • test soil was sieved to 1 cm, and 0.5% of kaolin soil and 0.5% of attapulgite with soil mass of 0.5% of polyaluminum chloride and 0.5% of aluminum sulfate with soil mass of 0.5% of soil were added to the soil.

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  • Environmental & Geological Engineering (AREA)
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Abstract

A stabilizing agent for treating chromium contaminated soil and an application thereof, the stabilizing agent comprises a crystal-volume expanding agent, a precipitating agent, a flocculating agent and a pH regulator, wherein the crystal-volume expanding agent is one of cement or clay materials or a combination thereof; the precipitating agent is one of sulfide, polysulfide, sulfite or pyrosulfite or a combination thereof, said agents can remarkably reduce the leaching concentration of chromium in the soil without damaging the property of the soil.

Description

一种用于处理铬污染土壤的稳定化药剂及其应用Stabilizing agent for treating chromium contaminated soil and application thereof 技术领域Technical field
本发明属于污染土壤修复领域，具体涉及一种用于处理六价铬污染土壤、废渣、污泥的稳定化药剂，使其中的六价铬稳定化，降低六价铬的迁移性、毒性。The invention belongs to the field of contaminated soil remediation, and particularly relates to a stabilizing agent for treating hexavalent chromium contaminated soil, waste residue and sludge, which stabilizes hexavalent chromium therein and reduces the migration and toxicity of hexavalent chromium.
背景技术Background technique
在环境化学污染物中，六价铬是最常见、危害居民健康最严重的污染物之一。特别是随着现代工业生产的发展，六价铬对环境的污染日趋严重。六价铬污染的主要来源主要包括：(1)含铬废渣的不合理堆放。(2)制革、电镀企业废水、污泥的不合理排放等。Among the environmental chemical pollutants, hexavalent chromium is one of the most common pollutants that endanger the health of residents. Especially with the development of modern industrial production, the pollution of hexavalent chromium to the environment has become increasingly serious. The main sources of hexavalent chromium pollution mainly include: (1) Unreasonable stacking of chromium-containing waste slag. (2) Unreasonable discharge of wastewater and sludge from tanning and electroplating enterprises.
六价铬污染物迁移性强、毒性大，具有较强的氧化性、腐蚀性，对人体皮肤有强烈的腐蚀作用，引起皮肤灼伤和溃疡，长期摄入会导致肉瘤、扁平上皮癌、腺癌等疾病；眼睛接触后会引起角膜损伤；六价铬可经消化道、呼吸道或皮肤进入体内，导致细胞畸变、癌变。污染土壤中的六价铬可以随扬尘、土壤溶液等接触并进入人体，因此六价铬污染土壤对人类健康和环境的危害十分严重，国内外环保工作者非常重视六价铬污染土壤的治理，六价铬污染土壤的治理也是国内外环保科研工作者的研究热点之一。Hexavalent chromium contaminants are highly mobile, highly toxic, and have strong oxidizing and corrosive properties. They have strong corrosive effects on human skin, causing skin burns and ulcers. Long-term intake can lead to sarcoma, squamous cell carcinoma, and adenocarcinoma. And other diseases; corneal damage will occur after eye contact; hexavalent chromium can enter the body through the digestive tract, respiratory tract or skin, leading to cell distortion and cancer. The hexavalent chromium in the polluted soil can contact with the dust and soil solution and enter the human body. Therefore, the hexavalent chromium contaminated soil is very harmful to human health and the environment. Environmental protection workers at home and abroad attach great importance to the treatment of hexavalent chromium contaminated soil. The treatment of hexavalent chromium contaminated soil is also one of the research hotspots of environmental protection researchers at home and abroad.
目前针对六价铬污染土壤的修复技术有土壤淋洗法、土壤清洗法、原位化学还原法、微生物修复法、稳定化固化修复法等。在国内已经完成的六价铬污染土壤修复工程中，采用较多的技术为固化稳定化技术。市场上销售的六价铬污染土壤稳定化固化药剂比较昂贵，而且处理后对土壤结构破坏较大、处理后土壤“增容比”较大，均高于1.1。At present, the techniques for repairing hexavalent chromium contaminated soil include soil leaching method, soil cleaning method, in situ chemical reduction method, microbial remediation method, and stabilization curing method. In the domestic hexavalent chromium contaminated soil remediation project, more technologies are used as curing stabilization technology. The hexavalent chromium-contaminated soil stabilized curing agent sold on the market is relatively expensive, and the soil structure damage is large after treatment, and the soil "compatibility ratio" after treatment is larger, both higher than 1.1.
技术问题technical problem
现有技术中，用于处理六价铬污染土壤的稳定化固化药剂比较昂贵，而且处理后对土壤结构破坏较大、处理后土壤“增容比”较大，均高于1.1。In the prior art, the stabilized curing agent for treating hexavalent chromium contaminated soil is relatively expensive, and the soil structure damage is large after treatment, and the soil "compatibility ratio" after treatment is larger, all higher than 1.1.
技术解决方案Technical solution
为了解决上述技术问题，降低修复费用、减少药剂对土壤结构的破坏、降低处理后土壤的“增容比”，本发明提供了一种成本较低、稳定化固化效果好、处理后“增容比”较小的药剂，并将其成功应用到铬污染土壤的修复工程中。In order to solve the above technical problems, reduce the repair cost, reduce the damage of the chemical structure to the soil, and reduce the "compatibilization ratio" of the treated soil, the present invention provides a lower cost, stable curing effect, and "compatibilized" after treatment. Than a smaller agent and successfully applied it to the repair of chromium-contaminated soil.
本发明提供的用于处理铬污染土壤的稳定化药剂，包括：晶容扩增剂、沉淀剂、絮凝剂和pH调节剂；The invention provides a stabilization agent for treating chromium contaminated soil, comprising: a crystal volume amplification agent, a precipitating agent, a flocculating agent and a pH adjusting agent;
其中，所述晶容扩增剂是水泥或粘土材料的其中之一或其组合；所述沉淀剂为硫化物、多硫化物、亚硫酸盐或焦亚硫酸盐的其中之一或其组合。Wherein the crystal volume amplification agent is one or a combination of cement or clay materials; the precipitant is one or a combination of sulfide, polysulfide, sulfite or pyrosulfite.
优选地，所述晶容扩增剂、絮凝剂和沉淀剂的质量比为0.1～3:0.1～3:0.1～1。 Preferably, the mass ratio of the crystal bulk amplifying agent, the flocculating agent and the precipitating agent is from 0.1 to 3:0.1 to 3:0.1 to 1.
优选地，所述絮凝剂为水溶性铝盐或四硼酸钠的其中之一或其组合；所述粘土材料为膨润土、高岭土、凹凸棒或海泡石中的一种或其组合。Preferably, the flocculating agent is one or a combination of a water-soluble aluminum salt or a sodium tetraborate; the clay material is one or a combination of bentonite, kaolin, attapulgite or sepiolite.
进一步地，所述絮凝剂为硫酸铝钾、氯化铝、聚合氯化铝或四硼酸钠的其中之一或其组合；所述沉淀剂为硫化钠、多硫化钠、硫化钙、多硫化钙、亚硫酸钠或焦亚硫酸钠的其中之一或其组合。Further, the flocculating agent is one of or a combination of potassium aluminum sulfate, aluminum chloride, polyaluminum chloride or sodium tetraborate; the precipitating agent is sodium sulfide, sodium polysulfide, calcium sulfide, calcium polysulfide One or a combination of sodium sulfite or sodium metabisulfite.
更优选地，所述絮凝剂为硫酸铝钾和四硼酸钠重量比1:0.8～1的混合物；所述沉淀剂为硫化钠与亚硫酸钠重量比1:0.5～1的混合物。More preferably, the flocculating agent is a mixture of potassium sulfate and sodium tetraborate in a weight ratio of 1:0.8 to 1; the precipitating agent is a mixture of sodium sulfide and sodium sulfite in a weight ratio of 1:0.5 to 1.
所述pH调节剂呈碱性，可为氢氧化钠、氢氧化钙、氧化钙等。The pH adjuster is alkaline and may be sodium hydroxide, calcium hydroxide, calcium oxide or the like.
优选地，所述晶容扩增剂是水泥和膨润土重量比1:1的混合物。Preferably, the crystal volume amplification agent is a mixture of cement and bentonite in a weight ratio of 1:1.
本发明提供上述的稳定化药剂用于处理铬污染土壤的方法，包括如下步骤：The present invention provides a method for treating a chromium contaminated soil as described above, comprising the steps of:
(1)向铬污染土壤中加入晶容扩增剂和絮凝剂，搅拌；(1) adding a crystal bulk amplifying agent and a flocculating agent to the chromium contaminated soil, and stirring;
(2)将沉淀剂和pH调节剂配制成水溶液，加入步骤(1)的所得的混合物中，pH调节剂将pH值调节至6～9，搅拌，养护。(2) The precipitating agent and the pH adjuster are formulated into an aqueous solution, added to the obtained mixture of the step (1), and the pH adjuster is adjusted to a pH of 6 to 9, stirred, and cured.
优选地，步骤(2)的水溶液中沉淀剂的质量百分比浓度为1％～10％，pH调节剂的质量百分比浓度为0.1～10％。Preferably, the mass percentage of the precipitating agent in the aqueous solution of the step (2) is from 1% to 10%, and the mass percent concentration of the pH adjusting agent is from 0.1 to 10%.
优选地，养护时间为1～10天。Preferably, the curing time is from 1 to 10 days.
有益效果Beneficial effect
本发明能够达到如下技术效果：The invention can achieve the following technical effects:
本发明提供的用于处理铬污染土壤的稳定化药剂成本较低，稳定化固化效果好(稳定化率在90％以上)，其对铬污染土壤处理后“增容比”不超过1.1，且不会破坏土壤的结构。The stabilization agent for treating chromium-contaminated soil provided by the invention has lower cost and good stabilization and solidification effect (stabilization rate is above 90%), and the "compatibility ratio" after treatment of chromium-contaminated soil does not exceed 1.1, and Will not destroy the structure of the soil.
本发明的实施方式Embodiments of the invention
下面结合具体实施例对本发明作进一步说明，以使本领域的技术人员可以更好的理解本发明并能予以实施，但所举实施例不作为对本发明的限定。The present invention will be further described in conjunction with the specific embodiments thereof, so that those skilled in the art can understand the present invention and can be practiced without departing from the scope of the invention.
土壤样品取自湖北某铬污染场地，采用《固体废物浸出毒性浸出方法硫酸硝酸法》(HJ/T299-2007)对土壤进行浸出处理，土壤中六价铬的浸出浓度为133.35mg/L。The soil samples were taken from a chromium-contaminated site in Hubei Province. The soil was leached by the method of solid waste leaching toxicity leaching method (HJ/T299-2007). The leaching concentration of hexavalent chromium in the soil was 133.35 mg/L.
实施例1：Example 1:
供试土壤过1cm筛，向土壤中添加土壤质量1％的膨润土，土壤质量0.5％的硫酸铝钾和土壤质量0.5％的四硼酸钠，均匀搅拌后施加土壤质量40％的硫化钠和氢氧化钠水溶液，硫化钠、氢氧化钠水溶液中硫化钠的添加量占土壤质量的1％，氢氧化钠的添加量占土壤质量的0.5％(将铬污染土壤的pH调节为8)，养护6天，检测处理后土壤中六价铬的浸出浓度为11.30mg/L，该药剂对土壤中六价铬的稳定化率为91.52％。处理后土壤的“增容比”为1.03。 The tested soil was sieved to 1 cm, and 1% of bentonite with soil mass, 0.5% potassium aluminum sulfate and 0.5% sodium tetraborate of soil quality were added to the soil, and 40% of sodium sulfide and hydroxide were applied after uniform stirring. Sodium sulphate, sodium sulphate, sodium hydroxide aqueous solution added sodium sulphate 1% of the soil mass, sodium hydroxide added to the soil mass of 0.5% (the pH of the chromium contaminated soil is adjusted to 8), curing for 6 days The leaching concentration of hexavalent chromium in the soil after the treatment was 11.30 mg/L, and the stabilization rate of the hexavalent chromium in the soil was 91.52%. The "compatibilization ratio" of the treated soil was 1.03.
实施例2Example 2
供试土壤过1cm筛，向土壤中添加土壤质量1％的膨润土，土壤质量0.5％的硫酸铝钾和土壤质量0.5％的四硼酸钠，均匀搅拌后施加土壤质量40％的硫化钠和氢氧化钠水溶液，硫化钠、氢氧化钠水溶液中硫化钠的添加量占土壤质量的1％，氢氧化钠的添加量占土壤质量的0.3％(将铬污染土壤的pH调节为7)，养护6天，检测处理后土壤中六价铬的浸出浓度为7.27mg/L，该药剂对土壤中六价铬的稳定化率为94.55％。处理后土壤的“增容比”为1.03。The tested soil was sieved to 1 cm, and 1% of bentonite with soil mass, 0.5% potassium aluminum sulfate and 0.5% sodium tetraborate of soil quality were added to the soil, and 40% of sodium sulfide and hydroxide were applied after uniform stirring. Sodium sulphate, sodium sulphide, sodium hydroxide solution in sodium sulphate added 1% of the soil mass, sodium hydroxide added to the soil mass of 0.3% (the pH of the chromium contaminated soil is adjusted to 7), curing for 6 days The leaching concentration of hexavalent chromium in the soil after the treatment was 7.27 mg/L, and the stabilization rate of the hexavalent chromium in the soil was 94.55%. The "compatibilization ratio" of the treated soil was 1.03.
实施例3Example 3
供试土壤过1cm筛，向土壤中添加土壤质量1％的膨润土，土壤质量0.5％的硫酸铝钾和土壤质量0.5％的四硼酸钠，均匀搅拌后施加土壤质量40％的硫化钠和氢氧化钠水溶液，硫化钠、氢氧化钠水溶液中硫化钠的添加量占土壤质量的1％，氢氧化钠的添加量占土壤质量的0.1％(将铬污染土壤的pH调节为7)，养护6天，检测处理后土壤中六价铬的浸出浓度为5.39mg/L，该药剂对土壤中六价铬的稳定化率为95.96％。处理后土壤的“增容比”为1.03。The tested soil was sieved to 1 cm, and 1% of bentonite with soil mass, 0.5% potassium aluminum sulfate and 0.5% sodium tetraborate of soil quality were added to the soil, and 40% of sodium sulfide and hydroxide were applied after uniform stirring. Sodium sulphate, sodium sulphide, sodium hydroxide aqueous solution in the amount of sodium sulphate added 1% of the soil mass, sodium hydroxide added to the soil mass of 0.1% (the pH of the chromium contaminated soil is adjusted to 7), curing for 6 days The leaching concentration of hexavalent chromium in the soil after the treatment was 5.39 mg/L, and the stability of the hexavalent chromium in the soil was 95.96%. The "compatibilization ratio" of the treated soil was 1.03.
实施例4Example 4
供试土壤过1cm筛，向土壤中添加土壤质量1％的水泥，土壤质量0.5％的硫酸铝钾和土壤质量0.5％的四硼酸钠，均匀搅拌后施加土壤质量40％的硫化钠和氢氧化钠水溶液，硫化钠、氢氧化钠水溶液中硫化钠的添加量占土壤质量的1％，氢氧化钠的添加量占土壤质量的0.1％(将铬污染土壤的pH调节为7)，养护6天，检测处理后土壤中六价铬的浸出浓度为6.72mg/L，该药剂对土壤中六价铬的稳定化率为94.96％。处理后土壤的“增容比”为1.08。The soil to be tested was passed through a 1 cm sieve, and 1% of cement with soil mass, 0.5% of potassium sulfate and 0.5% of sodium tetraborate of soil quality were added to the soil, and 40% of sodium sulfide and hydroxide were applied after uniformly stirring. Sodium sulphate, sodium sulphide, sodium hydroxide aqueous solution in the amount of sodium sulphate added 1% of the soil mass, sodium hydroxide added to the soil mass of 0.1% (the pH of the chromium contaminated soil is adjusted to 7), curing for 6 days The leaching concentration of hexavalent chromium in the soil after the treatment was 6.72 mg/L, and the stability of the hexavalent chromium in the soil was 94.96%. The "compatibility ratio" of the treated soil was 1.08.
实施例5Example 5
供试土壤过1cm筛，向土壤中添加土壤质量0.5％的水泥和土壤质量0.5％的膨润土，土壤质量0.5％的硫酸铝钾和土壤质量0.5％的四硼酸钠，均匀搅拌后施加土壤质量40％的硫化钠和氢氧化钠水溶液，硫化钠、氢氧化钠水溶液中硫化钠的添加量占土壤质量的1％，氢氧化钠的添加量占土壤质量的0.3％(将铬污染土壤的pH调节为7)，养护6天，检测处理后土壤中六价铬的浸出浓度为4.84mg/L，该药剂对土壤中六价铬的稳定化率为96.37％。处理后土壤的“增容比”为1.08。The tested soil was sieved to 1 cm, and the soil was added with 0.5% soil quality and 0.5% bentonite soil, 0.5% potassium aluminum sulfate and 0.5% sodium tetraborate soil. The soil quality was evenly stirred after mixing 40. % sodium sulfide and sodium hydroxide aqueous solution, sodium sulfide, sodium hydroxide solution, sodium sulfide added to the soil mass of 1%, sodium hydroxide added to the soil mass of 0.3% (pH adjustment of chromium-contaminated soil) 7), after 6 days of curing, the leaching concentration of hexavalent chromium in the soil after the treatment was 4.84 mg/L, and the stabilization rate of the hexavalent chromium in the soil was 96.37%. The "compatibility ratio" of the treated soil was 1.08.
实施例6Example 6
供试土壤过1cm筛，向土壤中添加土壤质量0.05％的水泥和土壤质量0.05％的膨润土，土壤质量0.05％的硫酸铝钾和土壤质量0.05％的四硼酸钠，均匀搅拌后施加土壤质量40％的硫化钠和氢氧化钠水溶液，硫化钠、氢氧化钠水溶液中硫化钠的添加量占土壤质量的1％，氢氧化钠的添加量占土壤质量的0.3％(将铬污染土壤的pH调节为7)，养护6天，检测处理后土壤中六价铬的浸出浓度为8.26mg/L，该药剂对土壤中六价铬的稳定化率为93.8％。处理后土壤的“增容比”为1.01。 The test soil was over 1cm sieve, adding 0.05% soil cement and soil quality 0.05% bentonite to soil, 0.05% aluminum sulfate potassium and 0.05% sodium tetraborate soil, and evenly stirred to apply soil quality 40 % sodium sulfide and sodium hydroxide aqueous solution, sodium sulfide, sodium hydroxide solution, sodium sulfide added to the soil mass of 1%, sodium hydroxide added to the soil mass of 0.3% (pH adjustment of chromium-contaminated soil) 7), after 6 days of curing, the leaching concentration of hexavalent chromium in the soil after the treatment was 8.26 mg/L, and the stability of the hexavalent chromium in the soil was 93.8%. The "compatibility ratio" of the treated soil was 1.01.
实施例7Example 7
供试土壤过1cm筛，向土壤中添加土壤质量0.15％的水泥和土壤质量0.15％的膨润土，土壤质量0.15％的硫酸铝钾和土壤质量0.15％的四硼酸钠，均匀搅拌后施加土壤质量40％的硫化钠和氢氧化钠水溶液，硫化钠、氢氧化钠水溶液中硫化钠的添加量占土壤质量的1％，氢氧化钠的添加量占土壤质量的0.3％(将铬污染土壤的pH调节为7)，养护6天，检测处理后土壤中六价铬的浸出浓度为4.85mg/L，该药剂对土壤中六价铬的稳定化率为96.4％。处理后土壤的“增容比”为1.03。The test soil was passed through a sieve of 1 cm, and 0.15% soil cement and 0.15% bentonite were added to the soil, aluminum sulfate potassium having a soil quality of 0.15% and sodium tetraborate having a soil quality of 0.15% were uniformly stirred and soil quality was applied 40. % sodium sulfide and sodium hydroxide aqueous solution, sodium sulfide, sodium hydroxide solution, sodium sulfide added to the soil mass of 1%, sodium hydroxide added to the soil mass of 0.3% (pH adjustment of chromium-contaminated soil) 7), after 6 days of curing, the leaching concentration of hexavalent chromium in the soil after the treatment was 4.85 mg/L, and the stabilization rate of the hexavalent chromium in the soil was 96.4%. The "compatibilization ratio" of the treated soil was 1.03.
实施例8Example 8
供试土壤过1cm筛，向土壤中添加土壤质量0.15％的水泥和土壤质量0.15％的膨润土，土壤质量0.15％的硫酸铝钾和土壤质量0.15％的四硼酸钠，均匀搅拌后施加土壤质量40％的硫化钠和氢氧化钠水溶液，硫化钠、氢氧化钠水溶液中硫化钠的添加量占土壤质量的0.1％，氢氧化钠的添加量占土壤质量的0.3％(将铬污染土壤的pH调节为7)，养护6天，检测处理后土壤中六价铬的浸出浓度为8.95mg/L，该药剂对土壤中六价铬的稳定化率为93.3％。处理后土壤的“增容比”为1.03。The test soil was passed through a sieve of 1 cm, and 0.15% soil cement and 0.15% bentonite were added to the soil, aluminum sulfate potassium having a soil quality of 0.15% and sodium tetraborate having a soil quality of 0.15% were uniformly stirred and soil quality was applied 40. % sodium sulfide and sodium hydroxide aqueous solution, sodium sulfide, sodium hydroxide aqueous solution added to the amount of 0.1% of soil mass, sodium hydroxide added to the soil mass of 0.3% (pH adjustment of chromium contaminated soil) 7), after 6 days of curing, the leaching concentration of hexavalent chromium in the soil after the treatment was 8.95 mg/L, and the stability of the hexavalent chromium in the soil was 93.3%. The "compatibilization ratio" of the treated soil was 1.03.
实施例9Example 9
供试土壤过1cm筛，向土壤中添加土壤质量0.5％的水泥和土壤质量0.5％的膨润土，土壤质量0.5％的硫酸铝钾和土壤质量0.4％的四硼酸钠，均匀搅拌后施加土壤质量40％的硫化钠和氢氧化钠水溶液，硫化钠、氢氧化钠水溶液中硫化钠的添加量占土壤质量的1％，氢氧化钠的添加量占土壤质量的0.3％(将铬污染土壤的pH调节为7)，养护6天，检测处理后土壤中六价铬的浸出浓度为6.02mg/L，该药剂对土壤中六价铬的稳定化率为95.5％。处理后土壤的“增容比”为1.05。The tested soil was sieved to 1 cm, and the soil was added with 0.5% soil cement and 0.5% bentonite soil, 0.5% potassium aluminum sulfate and 0.4% sodium tetraborate soil. The soil quality was evenly stirred after mixing 40. % sodium sulfide and sodium hydroxide aqueous solution, sodium sulfide, sodium hydroxide solution, sodium sulfide added to the soil mass of 1%, sodium hydroxide added to the soil mass of 0.3% (pH adjustment of chromium-contaminated soil) 7), after 6 days of curing, the leaching concentration of hexavalent chromium in the soil after the treatment was 6.02 mg/L, and the stability of the hexavalent chromium in the soil was 95.5%. The "compatibility ratio" of the treated soil was 1.05.
实施例10Example 10
供试土壤过1cm筛，向土壤中添加土壤质量0.5％的水泥和土壤质量0.5％的膨润土，土壤质量1％的硫酸铝钾，均匀搅拌后施加土壤质量40％的硫化钠和氢氧化钠水溶液，硫化钠、氢氧化钠水溶液中硫化钠的添加量占土壤质量的1％，氢氧化钠的添加量占土壤质量的0.3％(将铬污染土壤的pH调节为7)，养护6天，检测处理后土壤中六价铬的浸出浓度为8.43mg/L，该药剂对土壤中六价铬的稳定化率为93.7％。处理后土壤的“增容比”为1.08。The tested soil was passed through a sieve of 1 cm, and 0.5% soil cement and 0.5% bentonite were added to the soil, and the soil quality was 1% potassium aluminum sulfate. After uniformly stirring, 40% sodium sulfide and sodium hydroxide aqueous solution were applied. The amount of sodium sulfide added to the sodium sulfide and sodium hydroxide aqueous solution accounts for 1% of the soil mass, and the amount of sodium hydroxide added accounts for 0.3% of the soil mass (the pH of the chromium-contaminated soil is adjusted to 7), and the curing is carried out for 6 days. The leaching concentration of hexavalent chromium in the soil after treatment was 8.43 mg/L, and the stability of the hexavalent chromium in the soil was 93.7%. The "compatibility ratio" of the treated soil was 1.08.
实施例11Example 11
供试土壤过1cm筛，向土壤中添加土壤质量0.5％的水泥和土壤质量0.5％的膨润土，土壤质量1％的四硼酸钠，均匀搅拌后施加土壤质量40％的硫化钠和氢氧化钠水溶液，硫化钠、氢氧化钠水溶液中硫化钠的添加量占土壤质量的1％，氢氧化钠的添加量占土壤质量的0.3％(将铬污染土壤的pH调节为7)，养护6天，检测处理后土壤中六价铬的浸出浓度为8.67mg/L，该药剂对土壤中六价铬的稳定化率为93.5％。处理后土壤的“增容比”为1.08。 The tested soil was sieved to 1 cm, and the soil was added with 0.5% soil cement and 0.5% bentonite soil, 1% sodium tetraborate soil, and uniformly stirred to apply 40% sodium sulfide and sodium hydroxide aqueous solution. The amount of sodium sulfide added to the sodium sulfide and sodium hydroxide aqueous solution accounts for 1% of the soil mass, and the amount of sodium hydroxide added accounts for 0.3% of the soil mass (the pH of the chromium-contaminated soil is adjusted to 7), and the curing is carried out for 6 days. The leaching concentration of hexavalent chromium in the soil after treatment was 8.67 mg/L, and the stability of the hexavalent chromium in the soil was 93.5%. The "compatibility ratio" of the treated soil was 1.08.
实施例12Example 12
供试土壤过1cm筛，向土壤中添加土壤质量0.5％的水泥和土壤质量0.5％的高岭土，土壤质量0.5％的氯化铝和土壤质量0.5％的硫酸铝，均匀搅拌后施加土壤质量40％的亚硫酸钠和氢氧化钠水溶液，亚硫酸钠、氢氧化钠水溶液中亚硫酸钠的添加量占土壤质量的1％，氢氧化钠的添加量占土壤质量的0.3％(将铬污染土壤的pH调节为7)，养护7天，检测处理后土壤中六价铬的浸出浓度为7.42mg/L，该药剂对土壤中六价铬的稳定化率为94.43％。处理后土壤的“增容比”为1.05。The tested soil was sieved to 1 cm, and the soil was added with 0.5% soil quality and 0.5% kaolin soil, 0.5% aluminum chloride and 0.5% aluminum sulfate. After even mixing, the soil quality was 40%. The sodium sulfite and sodium hydroxide aqueous solution, the sodium sulfite solution in sodium sulfite and sodium hydroxide solution accounted for 1% of the soil mass, and the sodium hydroxide added amounted to 0.3% of the soil mass (the pH of the chromium-contaminated soil was adjusted to 7). After 7 days of curing, the leaching concentration of hexavalent chromium in the soil after the treatment was 7.42 mg/L, and the stability of the hexavalent chromium in the soil was 94.43%. The "compatibility ratio" of the treated soil was 1.05.
实施例13Example 13
供试土壤过1cm筛，向土壤中添加土壤质量0.5％的水泥和土壤质量0.5％的膨润土，土壤质量0.5％的硫酸铝钾和土壤质量0.5％的四硼酸钠，均匀搅拌后施加土壤质量40％的硫化钠、亚硫酸钠和氢氧化钠水溶液，硫化钠、亚硫酸钠和氢氧化钠水溶液中硫化钠的添加量占土壤质量的0.5％、亚硫酸钠的添加量占土壤质量的0.5％，氢氧化钠的添加量占土壤质量的0.3％(将铬污染土壤的pH调节为7)，养护7天，检测处理后土壤中六价铬的浸出浓度为3.56mg/L，该药剂对土壤中六价铬的稳定化率为97.33％。处理后土壤的“增容比”为1.02。The tested soil was sieved to 1 cm, and the soil was added with 0.5% soil quality and 0.5% bentonite soil, 0.5% potassium aluminum sulfate and 0.5% sodium tetraborate soil. The soil quality was evenly stirred after mixing 40. % sodium sulfide, sodium sulfite and sodium hydroxide aqueous solution, sodium sulfide, sodium sulfite and sodium hydroxide aqueous solution added to the amount of sodium sulfide 0.5% of the soil mass, sodium sulfite added 0.5% of the soil mass, sodium hydroxide added The amount accounts for 0.3% of the soil quality (the pH of the chromium-contaminated soil is adjusted to 7), and the leaching concentration of hexavalent chromium in the soil after treatment is 3.56 mg/L. The stability of the agent to the hexavalent chromium in the soil The rate of conversion was 97.33%. The "compatibility ratio" of the treated soil was 1.02.
实施例14Example 14
供试土壤过1cm筛，向土壤中添加土壤质量0.5％的水泥和土壤质量0.5％的膨润土，土壤质量0.5％的硫酸铝钾和土壤质量0.5％的四硼酸钠，均匀搅拌后施加土壤质量40％的硫化钠、亚硫酸钠和氢氧化钠水溶液，硫化钠、亚硫酸钠和氢氧化钠水溶液中硫化钠的添加量占土壤质量的0.6％、亚硫酸钠的添加量占土壤质量的0.3％，氢氧化钠的添加量占土壤质量的0.3％(将铬污染土壤的pH调节为7)，养护7天，检测处理后土壤中六价铬的浸出浓度为3.87mg/L，该药剂对土壤中六价铬的稳定化率为97.0％。处理后土壤的“增容比”为1.02。The tested soil was sieved to 1 cm, and the soil was added with 0.5% soil quality and 0.5% bentonite soil, 0.5% potassium aluminum sulfate and 0.5% sodium tetraborate soil. The soil quality was evenly stirred after mixing 40. % sodium sulfide, sodium sulfite and sodium hydroxide aqueous solution, sodium sulfide, sodium sulfite and sodium hydroxide aqueous solution in the amount of sodium sulfide added to the soil mass of 0.6%, sodium sulfite added to the soil mass of 0.3%, the addition of sodium hydroxide The amount is 0.3% of the soil quality (the pH of the chromium-contaminated soil is adjusted to 7), and the leaching concentration of hexavalent chromium in the soil after the treatment is 3.87 mg/L. The stability of the agent to the hexavalent chromium in the soil The rate of conversion was 97.0%. The "compatibility ratio" of the treated soil was 1.02.
实施例15Example 15
供试土壤过1cm筛，向土壤中添加土壤质量0.5％的高岭土和土壤质量0.5％的凹凸棒，土壤质量0.5％的聚合氯化铝和土壤质量0.5％的硫酸铝，均匀搅拌后施加土壤质量40％的Na2S2、焦亚硫酸钠和氢氧化钠水溶液，Na2S2、焦亚硫酸钠和氢氧化钠水溶液中硫化钠的添加量占土壤质量的0.5％、亚硫酸钠的添加量占土壤质量的0.5％，氢氧化钠的添加量占土壤质量的0.3％(将铬污染土壤的pH调节为7)，养护7天，检测处理后土壤中六价铬的浸出浓度为7.83mg/L，该药剂对土壤中六价铬的稳定化率为94.13％。处理后土壤的“增容比”为1.04。The test soil was sieved to 1 cm, and 0.5% of kaolin soil and 0.5% of attapulgite with soil mass of 0.5% of polyaluminum chloride and 0.5% of aluminum sulfate with soil mass of 0.5% of soil were added to the soil. 40% Na2S2, sodium metabisulfite and sodium hydroxide aqueous solution, Na2S2, sodium metabisulfite and sodium hydroxide aqueous solution added sodium sulfide 0.5% of the soil mass, sodium sulfite added 0.5% of the soil mass, sodium hydroxide The addition amounted to 0.3% of the soil quality (the pH of the chromium-contaminated soil was adjusted to 7), and the leaching concentration of hexavalent chromium in the soil after the treatment was 7.83 mg/L. The agent applied to the hexavalent chromium in the soil. The stabilization rate was 94.13%. The "compatibilization ratio" of the treated soil was 1.04.
以上所述实施例仅是为充分说明本发明而所举的较佳的实施例，本发明的保护范围不限于此。本技术领域的技术人员在本发明基础上所作的等同替代或变换，均在本发明的保护范围之内。本发明的保护范围以权利要求书为准。 The embodiments described above are merely preferred embodiments for the purpose of fully illustrating the invention, and the scope of the invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are within the scope of the present invention. The scope of the invention is defined by the claims.

Claims (10)

  1. 一种用于处理铬污染土壤的稳定化药剂，其特征在于，包括：晶容扩增剂、沉淀剂、絮凝剂和pH调节剂；A stabilizing agent for treating chromium-contaminated soil, comprising: a crystal bulk amplifying agent, a precipitating agent, a flocculating agent and a pH adjusting agent;
    其中，所述晶容扩增剂是水泥或粘土材料的其中之一或其组合；所述沉淀剂为硫化物、多硫化物、亚硫酸盐或焦亚硫酸盐的其中之一或其组合。Wherein the crystal volume amplification agent is one or a combination of cement or clay materials; the precipitant is one or a combination of sulfide, polysulfide, sulfite or pyrosulfite.
  2. 根据权利要求1所述的稳定化药剂，其特征在于，所述晶容扩增剂、絮凝剂和沉淀剂的质量比为0.1～3:0.1～3:0.1～1。The stabilizing agent according to claim 1, wherein the mass ratio of the crystal bulk amplifying agent, the flocculating agent and the precipitating agent is from 0.1 to 3:0.1 to 3:0.1 to 1.
  3. 根据权利要求1所述的稳定化药剂，其特征在于，所述絮凝剂为水溶性铝盐或四硼酸钠的其中之一或其组合；所述粘土材料为膨润土、高岭土、凹凸棒或海泡石中的一种或其组合。The stabilizing agent according to claim 1, wherein the flocculating agent is one or a combination of a water-soluble aluminum salt or sodium tetraborate; and the clay material is bentonite, kaolin, attapulgite or sea breeze. One or a combination of stones.
  4. 根据权利要求1所述的稳定化药剂，其特征在于，所述絮凝剂为硫酸铝钾、氯化铝、聚合氯化铝或四硼酸钠的其中之一或其组合；所述沉淀剂为硫化钠、多硫化钠、硫化钙、多硫化钙、亚硫酸钠或焦亚硫酸钠的其中之一或其组合。The stabilizing agent according to claim 1, wherein the flocculating agent is one or a combination of potassium aluminum sulfate, aluminum chloride, polyaluminum chloride or sodium tetraborate; and the precipitating agent is vulcanized. One or a combination of sodium, sodium polysulfide, calcium sulfide, calcium polysulfide, sodium sulfite or sodium metabisulfite.
  5. 根据权利要求4所述的稳定化药剂，其特征在于，所述絮凝剂为硫酸铝钾和四硼酸钠重量比1:0.8～1的混合物；所述沉淀剂为硫化钠与亚硫酸钠重量比1:0.5～1的混合物。The stabilizing agent according to claim 4, wherein the flocculating agent is a mixture of potassium sulfate and sodium tetraborate in a weight ratio of 1:0.8 to 1; and the precipitating agent is a weight ratio of sodium sulfide to sodium sulfite 1: A mixture of 0.5 to 1.
  6. 根据权利要求1所述的稳定化药剂，其特征在于，所述pH调节剂呈碱性。The stabilization agent according to claim 1, wherein the pH adjuster is alkaline.
  7. 根据权利要求1所述的稳定化药剂，其特征在于，所述晶容扩增剂是水泥和膨润土重量比1:1的混合物。The stabilizing agent according to claim 1, wherein the crystal bulk amplifying agent is a mixture of cement and bentonite in a weight ratio of 1:1.
  8. 权利要求1～7任一项所述的稳定化药剂用于处理铬污染土壤的方法，其特征在于，包括如下步骤：The method for treating a chromium-contaminated soil according to any one of claims 1 to 7, comprising the steps of:
    向铬污染土壤中加入晶容扩增剂和絮凝剂，搅拌；Adding a crystal bulk amplifying agent and a flocculating agent to the chromium contaminated soil and stirring;
    将沉淀剂和pH调节剂配制成水溶液，加入步骤(1)的所得的混合物中，pH调节剂将pH值调节至6～9，搅拌，养护。The precipitating agent and the pH adjuster are formulated into an aqueous solution, added to the resulting mixture of the step (1), and the pH adjuster is adjusted to a pH of 6 to 9, stirred, and cured.
  9. 根据权利要求8所述的方法，其特征在于，步骤(2)的水溶液中沉淀剂的质量百分比浓度为1％～10％，pH调节剂的质量百分比浓度为0.1～10％。The method according to claim 8, wherein the concentration of the precipitant in the aqueous solution of the step (2) is from 1% to 10%, and the concentration by mass of the pH adjuster is from 0.1 to 10%.
  10. 根据权利要求8所述的方法，其特征在于，养护时间为1～10天。 The method of claim 8 wherein the curing time is from 1 to 10 days.
PCT/CN2016/087207 2016-04-06 2016-06-27 Stabilizing agent for treating chromium contaminated soil and application thereof WO2017173737A1 (en)

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