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Method for repairing chromium-contaminated soil

A technology of chromium-contaminated soil and soil, applied in the restoration of polluted soil, etc., to achieve the effect of solving the problem of yellowing

Inactive Publication Date: 2019-10-25
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the problems existing in the prior art, the present invention provides a method for remediating chromium-contaminated soil, which completely solves the problem of The problem of "returning yellow" after remediation of chromium-contaminated soil not only realizes the long-term treatment and ecological restoration of chromium-contaminated soil, but also realizes the recycling and utilization of chromium resources in soil, which has a good application prospect

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Effect test

Embodiment 1

[0068] The invention provides a method for remediating this chromium-contaminated soil, said method comprising the following steps:

[0069] (1) The chromium-contaminated soil containing 8000mg / kg of hexavalent chromium and the grinding solution are wet-milled to obtain a slurry; wherein, the particle size of the chromium-contaminated soil particles in the slurry is 160 mesh, and in the slurry The content of chromium-contaminated soil is 50%;

[0070] (2) mixing the slurry obtained in step (1) with 80% sulfuric acid and the return solution, and performing an acidification treatment for 2 hours to obtain the acidification treatment slurry, which was subjected to solid-liquid separation to obtain a treatment residue and pretreated soil; wherein , the amount of sulfuric acid added is H 2 SO 4 The ratio of meter to chromium-contaminated soil quality in the slurry is 0.2:1; wherein, 99.2% of the acid-soluble hexavalent chromium and water-soluble hexavalent chromium in the soil ar...

Embodiment 2

[0077] The invention provides a method for remediating this chromium-contaminated soil, said method comprising the following steps:

[0078] (1) The chromium-contaminated soil containing 16000 mg / kg of hexavalent chromium and the grinding solution are wet-milled to obtain a slurry; wherein, the particle size of the chromium-contaminated soil particles in the slurry is 200 mesh, and in the slurry The content of chromium-contaminated soil is 60%;

[0079] (2) mixing the slurry obtained in step (1) with sulfuric acid with a concentration of 95% and the return solution, and performing an acidification treatment for 2 hours to obtain the acidification treatment slurry, and through solid-liquid separation, to obtain a treatment residual liquid and pretreated soil; wherein , the amount of sulfuric acid added is H 2 SO 4 The ratio of meter to chromium-contaminated soil quality in the slurry is 0.3:1; wherein, 99.3% of the acid-soluble hexavalent chromium and water-soluble hexavalent...

Embodiment 3

[0086] The invention provides a method for remediating this chromium-contaminated soil, said method comprising the following steps:

[0087] (1) The chromium-contaminated soil containing 5000 mg / kg of hexavalent chromium and the grinding solution are wet-milled to obtain a slurry; wherein, the particle size of the chromium-contaminated soil particles in the slurry is 120 mesh, and in the slurry The content of chromium-contaminated soil is 50%;

[0088] (2) mixing the slurry obtained in step (1) with 80% sulfuric acid and the return solution, and performing an acidification treatment for 2 hours to obtain the acidification treatment slurry, which was subjected to solid-liquid separation to obtain a treatment residue and pretreated soil; wherein , the amount of sulfuric acid added is H 2 SO 4 The ratio of meter to chromium-contaminated soil quality in the slurry is 0.15:1; wherein, 99.1% of the acid-soluble hexavalent chromium and water-soluble hexavalent chromium in the soil ...

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Abstract

The invention relates to a method for repairing chromium-contaminated soil. The method for repairing the chromium-contaminated soil comprises the steps that a mode by combining acidification of chromium release, chemical and biomass reduction and phytoremediation is adopted, firstly acid-soluble hexavalent chromium and water-soluble hexavalent chromium in the soil are released to enter a slurry, solid-liquid separation is carried out on the slurry, so that the hexavalent chromium is transferred to a filter liquor and is effectively separated from the soil; and then the hexavalent chromium in the filter liquor is reduced and precipitated to chromium hydroxide, resource recycling is carried out, chemical reduction, long-acting reduction of biomass and the phytoremediation are adopted by thehexavalent chromium residual in the soil after separation and filtration, and the problem of ''yellowing'' after the chromium-contaminated soil is repaired is solved.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a method for remediating chromium-contaminated soil. Background technique [0002] Chromium-polluted soil in my country is mainly caused by the stockpiling of chromium slag discharged by chromium salt production enterprises and the leftover sites of relocation enterprises. After the founding of the People's Republic of China, 63 chromium salt factories have been built successively in my country, which is twice the total number of foreign chromium salt production enterprises. Due to the backward traditional production technology of chromium salt, about 1.5 to 3 tons of chromium slag are produced for every 1 ton of chromium salt produced. According to statistics, in 2005, my country accumulated more than 6 million tons of residual chromium slag, and as of 2012, all detoxification has been completed. However, during the long-term stockpiling of chromium slag, many measures...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08B09C1/10
CPCB09C1/00B09C1/08B09C1/105
Inventor 徐红彬陈辉霞唐海燕张红玲佟雪娇王兴润曾亚嫔
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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