Passivating agent used for treating lead-cadmium compound contaminated soil as well as preparation method thereof and using method thereof

A compound pollution and passivation agent technology, applied in the field of remediation of heavy metal-contaminated soil, can solve problems such as soil acidification and water eutrophication, achieve the effect of reducing effective content, not occupying cultivated land, and broad application prospects

Inactive Publication Date: 2017-05-31
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

The remediation efficiency of soluble phosphate is higher than that of insoluble phosphate, but it is easy to cause soil acidification, and the application of excessive P may cause the risk of water eutrophication; and clay minerals, as the main body of soil colloid, play an important role in the natural purification process of soil. It has the characteristics of high mechanical stability, good dispersion and suspension, large porosity, strong ion exchange and adsorption, etc. It has the advantages of not changing the soil structure and not destroying the ecology when used in the restoration of heavy metal pollution in soil

Method used

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  • Passivating agent used for treating lead-cadmium compound contaminated soil as well as preparation method thereof and using method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0030] A passivating agent for controlling lead-cadmium complex polluted soil is obtained by compounding 55% of acid-modified sepiolite, 25% of calcium dihydrogen phosphate and 20% of phosphate rock powder in terms of mass fraction.

Embodiment 2

[0032] A passivating agent for controlling lead-cadmium complex polluted soil is obtained by compounding 50% of acid-modified sepiolite, 25% of calcium dihydrogen phosphate and 25% of phosphate rock powder in terms of mass fraction.

Embodiment 3

[0034] A passivating agent for controlling lead-cadmium complex polluted soil is obtained by compounding 55% of acid-modified sepiolite, 20% of calcium dihydrogen phosphate and 25% of phosphate rock powder in terms of mass fraction.

[0035] The passivating agent obtained by compounding described in above-mentioned embodiments 1~3, its preparation method is consistent, all comprises the following steps:

[0036] (1) pass through 100 mesh sieves respectively after calcium dihydrogen phosphate and phosphate rock powder are dried, get the undersieve of calcium dihydrogen phosphate and phosphate rock powder and mix for subsequent use;

[0037] (2) Break the sepiolite and pass through a 100-mesh sieve, take the under-sieve of the sepiolite and put it into an acidic solution with a concentration of 6mol / L, and stir continuously for 48 hours under the condition of a constant temperature water bath at 45°C until solid-liquid The volume ratio is 1:10, and then the sepiolite is separate...

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Abstract

The invention relates to the technical field of repair of heavy metal contaminated soil, in particular to a passivating agent used for treating lead-cadmium compound contaminated soil as well as a preparation method thereof and a using method thereof. The passivating agent is prepared by compounding sepiolite and phosphor-containing substances. The preparation method for the passivating agent comprises the following steps: mixing acidic modified sepiolite, calcium dihydrogen phosphate and phosphorite powder, and uniformly mixing to obtain the passivating agent. The using method for the passivating agent comprises the following steps: pre-treating the lead-cadmium compound contaminated soil, performing air-drying on the contaminated soil, grinding the contaminated soil, enabling the grinded contaminated soil to pass through a 20-mesh sieve, adding the passivating agent into the pre-treated contaminated soil, adding water to uniformly mix, maintaining the uniformly mixed soil in situ, and enabling the passivating agent to sufficiently react with heavy metals in the soil. The passivating agent provided by the invention is low in raw material cost, is high in passivating efficiency, is stable in effect, and is suitable for farmland treatment with great Pb and Cd contaminated area and light contamination degree.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of remediation of heavy metal-contaminated soil, in particular to a passivator for treating lead-cadmium compound-contaminated soil and a preparation and use method thereof. [0003] 【Background technique】 [0004] Soil is an indispensable natural resource for human survival. With the modernization of industrial and agricultural production in our country, soil heavy metal pollution has become a major environmental pollution problem. Soil heavy metal pollution has the characteristics of concealment, hysteresis, accumulation, and irreversibility. Once heavy metal elements enter the soil, they are difficult to be degraded by microorganisms in the soil. The treatment process is very difficult, and heavy metals will enter the food chain with crops, endangering people. of good health. As typical soil heavy metal pollutants, lead and cadmium have the characteristics of strong toxicity and wide pollution r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/06B09C1/08
CPCB09C1/08C09K17/06
Inventor 张惠灵付煜恒王宇陈永亮段宁
Owner WUHAN UNIV OF SCI & TECH
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