Sulfur-induced stabilization treatment method for iron-rich antimony polluted soil

A technology for stabilizing treatment and polluted soil, applied in the field of soil remediation, can solve the problems of secondary environmental pollution and high cost, and achieve the effect of simple operation

Inactive Publication Date: 2021-09-28
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above soil remediation technologies have limitations such as high cost, heavy metals will be activated and cause secondary pollution to the environment.

Method used

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  • Sulfur-induced stabilization treatment method for iron-rich antimony polluted soil
  • Sulfur-induced stabilization treatment method for iron-rich antimony polluted soil
  • Sulfur-induced stabilization treatment method for iron-rich antimony polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Self-made antimony-contaminated soil for testing was used as iron-rich antimony-contaminated soil, and the preparation method was as follows:

[0071] At room temperature, 160mL of water and 27g of FeCl 3 4H 2 After O is mixed, add water to dilute to 500mL, adjust the pH value to 7.5 with NaOH solution, stabilize for 4h, then repeatedly wash three times with deionized water in a positive pressure filter to remove excess electrolyte, and then evenly disperse the solid ferric hydroxide into anaerobic water, pass N 2 To remove the dissolved oxygen in the solution, 50mol / L is used as the background electrolyte to obtain the ferrihydrite suspension, and add Sb (V) reserve to the ferrihydrite suspension according to the molar ratio of Fe / Sb(V)=500 Liquid (potassium pyroantimonate solution, concentration is 3g / L), 170rmp shakes and balances 24h, removes supernatant after centrifugation, obtains iron-rich type antimony-contaminated soil, wherein, the material of iron and anti...

Embodiment 2

[0081] According to the method of embodiment 1, self-made test antimony-contaminated soil is used as iron-rich type antimony-contaminated soil, wherein, in the iron-rich type antimony-contaminated soil, the ratio of the amount of iron and antimony is 100:1, and the content of antimony is 7500mg / kg.

[0082] According to the method of Example 1, the iron-rich antimony-contaminated soil prepared by the above method was subjected to sulfur-induced stabilization treatment to obtain stable soil.

[0083] According to the method of Example 1, the steady-state soil obtained in Example 2 was carried out to the determination of phosphate-extracted antimony content, and the test result was: the leaching concentration of antimony in the described iron-rich type antimony-contaminated soil was 27 mg / L, and Example 1 The leaching concentration of antimony in the obtained steady-state soil was 3 mg / L, and 89% of the antimony in the steady-state soil obtained in Example 2 was transformed int...

Embodiment 3

[0086] According to the method of embodiment 1, self-made test antimony-contaminated soil is used as iron-rich type antimony-contaminated soil, wherein, the ratio of the amount of iron and antimony in the iron-rich type antimony-contaminated soil is 50:1, and the content of antimony is 15000mg / kg.

[0087] According to the method of Example 1, the iron-rich antimony-contaminated soil prepared by the above method was subjected to sulfur-induced stabilization treatment to obtain stable soil.

[0088] According to the method of embodiment 1, the steady state soil obtained in embodiment 3 is carried out the determination of phosphate extraction state antimony content, test result is: the leaching concentration of antimony in the described iron-rich type antimony polluted soil is 58mg / L, embodiment 1 The leaching concentration of antimony in the obtained steady-state soil was 21 mg / L, and 64% of the antimony in the steady-state soil obtained in Example 3 was transformed into a non...

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Abstract

The invention provides a sulfur-induced stabilization treatment method for iron-rich antimony polluted soil, and belongs to the field of soil remediation. According to the method, S<2-> ions serve as a reducing agent and react with amorphous ferric hydroxide in the soil to release ferrous ions, part of the ferrous ions promote the amorphous ferric hydroxide in the soil to be recrystallized and converted into stable iron oxyhydroxide, meanwhile, part of the ferrous ions react with the amorphous ferric hydroxide to generate superoxide radicals, Sb (III) adsorbed on the surface of the amorphous iron hydroxide is promoted to be oxidized into the Sb(V) so as to significantly reduce the toxicity of the antimony, and the Sb (V) is embedded into the stable iron hydroxide structure during the recrystallization so as to significantly reduce the mobility of the antimony and avoid the secondary pollution caused by the release of the antimony.

Description

technical field [0001] The invention relates to the field of soil remediation, in particular to a sulfur-induced stabilization treatment method for iron-rich antimony-contaminated soil. Background technique [0002] Antimony and its compounds are widely used in the production of batteries, combustion aids, papermaking, plastics, paints, glass and alloys because of their good semiconductor properties, flame retardancy, wear resistance and catalytic properties. However, due to extensive mining methods and low environmental awareness, a large amount of uncontrolled antimony enters the soil environment and water bodies. Antimony has toxic effects on microorganisms and plant growth, can inhibit the growth of plants, and is enriched in the edible parts of crops. Accumulation, exceeding the "National Food Hygiene Standard", and endangering human health. The problem of antimony pollution in the environment has attracted extensive attention of scholars at home and abroad. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/00B09C1/08
Inventor 王少锋尹秀玲张国庆贾永锋林金如
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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