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Passivating agent for governing heavy metal contaminated soil and preparation and use method of passivating agent

A technology of polluted soil and passivating agent, applied in the restoration of polluted soil, chemical instruments and methods, soil conditioning materials, etc., can solve the problems of poor anti-interference ability, heavy metal remelting, environmental hazards, etc. Less pollution, high feasibility and stable effect

Active Publication Date: 2015-08-19
CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor ability of some stabilizers to resist external interference, heavy metals may redissolve after alternating wet and dry conditions or changes in soil pH. Easy to return to solution, causing harm to the environment again

Method used

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Examples

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Effect test

Embodiment 1

[0025] A passivation agent for treating soil contaminated by heavy metals of the present invention. In terms of mass fraction, the passivation agent includes 45% clay minerals, 15% phosphates, 10% reducing agents, 10% sulfides and 20% alkaline substance. Among them, based on the total amount of passivating agent, clay minerals specifically contain 10% zeolite, 25% montmorillonite and 10% vermiculite, phosphate specifically contains 10% potassium phosphate and 5% potassium dihydrogen phosphate, and reducing agent specifically contains 8 % Ferrous sulfate and 2% sodium bisulfite, the sulfide is specifically 10% sodium sulfide, and the alkaline substance specifically contains 15% calcium oxide and 5% sodium carbonate.

[0026] A preparation method of the passivation agent of the above embodiment includes the following steps: according to the above mass fraction, mixing clay minerals, phosphates, reducing agents, sulfides and alkaline substances, and after stirring uniformly, the pas...

Embodiment 2

[0035] A passivating agent for treating soil contaminated by heavy metals of the present invention. In terms of mass fraction, the passivating agent includes 35% clay minerals, 20% phosphate, 10% reducing agent, 15% sulfide and 20% alkaline substance. Among them, based on the total amount of passivating agent, clay minerals contain 10% sepiolite, 15% montmorillonite and 10% kaolinite, and phosphate contains 10% sodium phosphate and 10% sodium dihydrogen phosphate. The agent specifically contains 5% of ferrous sulfate and 5% of sodium thiosulfate, the sulfide contains 10% of sodium sulfide and 5% of ferrous sulfide, and the alkaline substance contains 15% of calcium oxide and 5% of potassium carbonate.

[0036] A preparation method of the passivation agent of the above embodiment includes the following steps: according to the above mass fraction, mixing clay minerals, phosphates, reducing agents, sulfides and alkaline substances, and after stirring uniformly, the passivation agent...

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Abstract

The invention discloses a passivating agent for governing heavy metal contaminated soil and a preparation and use method of the passivating agent. The passivating agent comprises, in weight percent, 30%-50% of clay minerals, 10%-20% of phosphate, 10%-15% of reducing agents, 10%-15% of sulfide and 15%-20% of alkaline substances. The preparation method includes a step: mixing the clay minerals, the phosphate, the reducing agents, the sulfide and the alkaline substances to mix to obtain the passivating agent. The use method includes the steps: firstly, crushing the heavy metal contaminated soil; secondly, adding the passivating agent into the crushed heavy metal contaminated soil; thirdly, adding water into the crushed heavy metal contaminated soil added the passivating agent to uniformly mix, maintaining the uniformly mixed soil on site, and enabling the passivating agent and heavy metal in the soil to sufficiently react. The passivating agent can effectively meet the urgent requirements of current Chinese heavy metal contaminated soil for high stability, no secondary pollution, durable and stable effect and low cost.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a passivator for treating heavy metal polluted soil and a preparation and use method thereof. Background technique [0002] The Chinese patent document with the publication number CN102559198A discloses a passivator for controlling soil heavy metal copper, lead, and cadmium pollution. heavy metals in soil. This invention can make full use of the medium and low-grade phosphate rock resources that are generally difficult to use in my country, with less investment and a small amount of work, but its disadvantage is that the use of phosphate rock powder may cause soil compaction, and at the same time, the impurities in the phosphate rock powder may contain other heavy metals. Risk of secondary pollution. The Chinese patent document with the publication number CN102701554A discloses a stabilizer for the treatment of heavy metal-contaminated bottom sludge, the stabili...

Claims

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Application Information

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IPC IPC(8): C09K17/08B09C1/08
CPCB09C1/08C09K17/08C09K2109/00
Inventor 蒋晓云何劲松李军易亚男
Owner CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD
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