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Restoration method for chromium-polluted soil

A technology of chromium-contaminated soil and remediation method, which is applied in the restoration of polluted soil, etc. It can solve the problems of secondary pollution, improper treatment of curing agent, high material and labor costs, etc., and achieve the effect of reducing repair cost and usage volume

Inactive Publication Date: 2016-07-13
侯绪华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to excavate the soil, requires a large amount of curing agent, high material and labor costs, and improper handling of the curing agent may cause secondary pollution

Method used

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Embodiment Construction

[0026] The present invention will be described in detail below through specific embodiments. This description is exemplary, and those skilled in the art should understand that changes and modifications can be made on the basis of the present invention, and the protection scope of the present invention is not limited to this embodiment.

[0027] The chromium-contaminated soil remediation method provided by the present invention simply includes the following steps: (1) at first, get a maximized long side and a maximized wide side around the chromium-contaminated soil to be repaired, and then encircle a city with a thin line For rectangles (including squares), take M points (M is a positive integer greater than or equal to 10) at equal intervals on the long side as measurement points, and select N points at equal intervals on the wide side (N is a positive integer greater than or equal to 10) as measurement points point, M can be greater than or equal to N, and the distance betwee...

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Abstract

The invention discloses a long-effecting restoration method for chromium-polluted soil. The restoration method is good in treatment effect, low in cost, low in secondary pollution possibility and high in practicability, and comprises the following steps: drawing a chromium pollution distribution diagram of measurement points, simulating a chromium pollution distribution diagram of a whole soil block, excavating heavily polluted soil according to the pollution distribution diagram, putting the heavily polluted soil into a ball grinder, reducing hexavalent chromium in chromate into trivalent chromium through a reducing agent, then adding an adhesive to cure the reduced soil, ploughing moderately polluted soil to flatten the soil, spraying a sulfate aqueous solution into the soil according to the chromate concentration obtained by calculation, soaking the soil, extracting to separate the chromate out, further reducing the hexavalent chromium in the extracted chromate into trivalent chromium through the reducing agent, and adding the adhesive to cure the soil.

Description

technical field [0001] The invention relates to a method for remediating chromium-contaminated soil, in particular to a modular method for remediating chromium-contaminated soil. Background technique [0002] In recent years, metal chromium and chromium salts have been widely used as industrial raw materials in electroplating, casting, chemical industry, metallurgy, leather manufacturing, aerospace and other industries, and their demand is also increasing day by day. The chromium slag produced in the industrial production process is harmful to the environment. Cause serious pollution. Chromium slag mainly refers to waste residue containing Cr(Ⅵ) produced in the production and application of chromium compounds. Roasting (or liquid-phase oxidation) reaction, and the residue containing Cr(Ⅵ) obtained after chromate leaching and separation is also included in industrial applications such as iron and steel, nonferrous metals, chemicals, electroplating, and leather tanning. Cr(Ⅵ)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02B09C1/08B09C1/00
CPCB09C1/02B09C1/00B09C1/08
Inventor 侯绪华
Owner 侯绪华
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