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A stabilizer for repairing heavy metal chromium pollution and its preparation method and application

A technology of stabilizer and heavy metal, applied in the field of stabilizer for repairing heavy metal chromium pollution and its preparation, can solve the problems of low stabilization efficiency, short stabilization period and the like

Active Publication Date: 2021-12-21
HUNAN JINLV ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The key point of curing / stabilization repair technology is the stabilizer used. Traditional stabilizers usually have low stabilization efficiency and short stabilization period. Therefore, it is very important to develop a stabilizer with high efficiency and long stabilization period. Significance

Method used

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  • A stabilizer for repairing heavy metal chromium pollution and its preparation method and application
  • A stabilizer for repairing heavy metal chromium pollution and its preparation method and application
  • A stabilizer for repairing heavy metal chromium pollution and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A preparation method for a stabilizer for repairing heavy metal chromium pollution, comprising the following steps:

[0045] 1) Mix the following agents that have been fully dried according to the following mass ratio, calcium polysulfide: reduced iron powder: wheat bran = 3:1:1, and put them into a ball mill mixer to quickly mix evenly. Stored in a dry environment for later use, the reducing agent prepared at this stage is recorded as reducing agent 1.

[0046] The calcium polysulfide added during the preparation of the reducing agent needs to be dried in a blast drying oven at 45°C for 4 hours. The purity of the calcium polysulfide is industrially pure crystals with a purity greater than 50%. Wheat bran is a by-product of flake wheat flour. The added The moisture content of wheat bran must not exceed 2%; the particle size of the above-mentioned reduced iron powder is more than 400 mesh, and the iron content must be greater than 85%.

[0047] 2) Add 2.65% to 4.4% of b...

Embodiment 2

[0057] Preliminary experiment: Screening and ratio selection experiment of the effective components of the reducing agent in the reducing core:

[0058] 1. Stabilization efficiency experiment of single-component reducing agent on chromium-contaminated soil:

[0059] Table 1: Experimental results of stabilization efficiency of single-component reducing agent on chromium-contaminated soil

[0060]

[0061] The above table 1 shows that the soil stabilization experiments were carried out on the single components of the reducing inner core agent. The hexavalent chromium leaching concentration blank control value of the untreated soil was 28.2mg / L. After adding different dosages of the single agent, The concentration of leached hexavalent chromium in the soil has been reduced to a certain extent, and the use of calcium polysulfide component has the highest degree of stabilization of the soil, and the concentration of leached hexavalent chromium has been reduced to below the detec...

Embodiment 3

[0067] Verification experiment of biodegradable outer film:

[0068]The verification experiment of the degradable biological outer membrane is mainly demonstrated through the membrane biodegradation experiment, and the implementation process is as follows: in the membrane biodegradation experiment, the membrane liquid is cast on a horizontal glass plate, and the thickness of the membrane is kept within the range of 0.1-0.2mm. The film was cut into small square pieces of 2cm*2cm, and the weight of the film was weighed with a ten-thousand-digit balance and the serial number was recorded. Parallel experiments were performed on different concentrations of the film solution, and each sample was processed 3 times. In the experiment, the numbered square membranes were buried in the experimental soil at the same time and in order (Note: The membrane material needs to be soaked in water before being embedded in the soil, and the membrane material should be placed in deionized water at r...

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Abstract

The invention discloses a stabilizer for repairing heavy metal chromium pollution and its preparation method and application. The structure of the stabilizer includes a reducing inner core inside and a degradable biological outer film coated on the outside. The reducing inner core contains Calcium polysulfide, reduced iron powder and wheat bran, the degradable bio-outer film contains modified polyvinyl alcohol; the preparation method of the stabilizer includes preparing the inner core and the degradable bio-outer film to cover the film. The stabilized granule has a good stabilization effect on chromium-contaminated soil, and the stabilization rate is as high as 99% or more; the outer film covered by the stabilizer has good biodegradability, and can realize the segmented and slow release of the drug, The long-term stability of the drug is increased to a large extent. After the large-scale preparation of the stabilizer, it can be widely used in the restoration of heavy metal pollution in soil and the restoration of groundwater in contaminated sites, and has a certain promotion value.

Description

technical field [0001] The invention relates to the technical field of heavy metal pollution treatment, in particular to a stabilizer for repairing heavy metal chromium pollution, a preparation method and application thereof. Background technique [0002] As a major heavy metal pollutant in the environment, chromium mainly exists in trivalent and hexavalent forms, and trivalent chromium and hexavalent chromium can be transformed into each other. The toxicity of chromium is related to its valence state. Hexavalent chromium is 100 times more toxic than trivalent chromium, and it is easily absorbed and accumulated in the body, and can invade the human body through the digestive tract, respiratory tract and mucous membranes. Natural water does not contain chromium, the average concentration of chromium in seawater is 0.05μg / L, and it is even lower in drinking water. Chromium slag is toxic waste slag discharged during the production process of chromium salt and ferroalloy indust...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40A62D3/37B09C1/08
CPCC09K17/40A62D3/37B09C1/08A62D2101/43
Inventor 江湛如黄放魏勇红喻海彬袁本琦
Owner HUNAN JINLV ENVIRONMENTAL PROTECTION CO LTD
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