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Passivator for repairing soil heavy metal Cd pollution and preparation method thereof

A technology for repairing soil and heavy metals, applied in chemical instruments and methods, soil conditioning materials, applications, etc., can solve the problems of poor passivation repair effect, complex synthesis process, difficult to use on a large scale, etc., to make up for poor passivation effect, Simple synthesis process and small application amount

Active Publication Date: 2020-04-28
广东省地质实验测试中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, most of the soil heavy metal ion passivators used at home and abroad are mainly organic collectors containing sulfur and nitrogen or natural clay minerals and their mixed materials. Although the passivation repair effect of the material is very good, the price is generally expensive, and the synthesis process is very complicated, so it is difficult to use on a large scale, and the simple clay minerals, such as montmorillonite, wollastonite, attapulgite, etc. Although the synthesis process of passivation materials is simple and the cost of use is low, the passivation repair effect is poor, and often requires a very large amount of application to achieve an obvious passivation effect

Method used

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  • Passivator for repairing soil heavy metal Cd pollution and preparation method thereof
  • Passivator for repairing soil heavy metal Cd pollution and preparation method thereof
  • Passivator for repairing soil heavy metal Cd pollution and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A passivator for remediating soil heavy metal Cd pollution, it is made of the following raw materials in parts by weight:

[0043]

[0044] Above-mentioned a kind of preparation method that is used to repair the passivator of soil heavy metal Cd pollution, it comprises the following steps:

[0045] Step 1. Treatment of diatomite: Put the formula amount of diatomite into the scrubbing machine, add water to adjust the mass concentration to 35%, stir evenly, then add sodium hexametaphosphate with a mass concentration of 0.5% to continue scrubbing for 30 minutes, and then The scrubbing product is diluted to a mass concentration of 10% under stirring conditions, and then passed through a 100-mesh sieve to remove weeds, large-grained quartz and feldspar, and then allowed to settle, and the precipitate is filtered and then dried and crushed in sequence and grinding through a 200-mesh sieve to obtain treated diatomite; in the present embodiment, the drying temperature is 105...

Embodiment 2

[0053] A passivator for remediating soil heavy metal Cd pollution, it is made of the following raw materials in parts by weight:

[0054]

[0055] Above-mentioned a kind of preparation method that is used to repair the passivator of soil heavy metal Cd pollution, it comprises the following steps:

[0056] Step 1. Treatment of diatomite: Put the formula amount of diatomite into the scrubbing machine, add water to adjust the mass concentration to 30%, stir evenly, then add sodium hexametaphosphate with a mass concentration of 0.3% to continue scrubbing for 20 minutes, and then Dilute the scrubbing product to a mass concentration of 7% under stirring conditions, and then pass through an 80-mesh sieve to remove weeds, large-grained quartz and feldspar, and then let it stand for precipitation, filter the sediment, and then dry and pulverize it in turn and grinding through a 180 mesh sieve to obtain treated diatomite; in the present embodiment, the drying temperature is 100°C;

...

Embodiment 3

[0064] A passivator for remediating soil heavy metal Cd pollution, it is made of the following raw materials in parts by weight:

[0065]

[0066] Above-mentioned a kind of preparation method that is used to repair the passivator of soil heavy metal Cd pollution, it comprises the following steps:

[0067] Step 1. Treatment of diatomite: put the formula amount of diatomite into the scrubbing machine, add water to adjust the mass concentration to 40%, stir evenly, then add sodium hexametaphosphate with a mass concentration of 0.8% to continue scrubbing for 40 minutes, and then Dilute the scrubbing product to a mass concentration of 13% under stirring conditions, and then pass it through a 120-mesh sieve to remove weeds, large-grained quartz and feldspar, and then let it stand for precipitation, filter the sediment, and then dry and pulverize it in turn and grinding through a 220 mesh sieve to obtain treated diatomite; in the present embodiment, the drying temperature is 110°C...

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Abstract

The invention relates to the technical field of soil passivating and repairing materialsr, in particular to a passivator for repairing soil heavy metal Cd pollution and a preparation method thereof. The passivator for repairing the soil heavy metal Cd pollution is prepared from fly ash, diatomite, montmorillonite and quick lime, industrial solid waste fly ash generated by coal combustion is used as a main body material synthesized by the passivator ; clay mineral diatomite and montmorillonite are used as auxiliary materials for synthesis of the passivator; quicklime is used as an accelerant for synthesis of the passivator. The four materials are uniformly mixed according to a certain composition ratio and then a chemical thermal compounding reaction is performed and then the passivator forrepairing soil heavy metal Cd pollution can be obtained; the prepared passivator is low in price, simple in synthesis process, easy to produce in large scale, convenient to apply and popularize on alarge scale, small in application amount and excellent in passivating and repairing effect, and the environment-friendly concept of treating pollution with waste is achieved through recycling of industrial solid waste.

Description

technical field [0001] The invention relates to the technical field of soil passivation restoration materials, in particular to a passivation agent for restoration of soil heavy metal Cd pollution and a preparation method thereof. Background technique [0002] At present, with the continuous development of my country's social economy, environmental problems are becoming more and more prominent, especially the problem of heavy metal pollution in soil. Discovered and put to use. At present, domestic and foreign methods of remediation of heavy metal pollution in soil are mainly carried out from two aspects. One is to try to remove heavy metals from contaminated soil. Plant extraction and other technologies can extract excessive heavy metals in the soil by increasing the solubility and mobility of heavy metals. The common characteristics of these technologies are high repair costs, long repair cycles, and some will cause great damage to the physical and chemical properties of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/08C09K101/00
CPCC09K17/08C09K2101/00
Inventor 李媛媛江海燕曹鹏朱凰榕冯先翠刘文华李展强焦洪鹏陈亚刚
Owner 广东省地质实验测试中心
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