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Passivator for treating heavy metal polluted soil and its preparation and use method

A technology for polluted soil and heavy metals, which is used in the restoration of polluted soil, chemical instruments and methods, soil conditioning materials, etc. , high feasibility and stable effect

Active Publication Date: 2018-05-29
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

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of passivator of the present invention that is used to control heavy metal polluted soil, by mass fraction, this passivator comprises 45% clay mineral, 15% phosphate, 10% reducing agent, 10% sulfide and 20% alkaline substances. Among them, based on the total amount of passivating agent, the clay mineral specifically contains 10% zeolite, 25% montmorillonite and 10% vermiculite, the phosphate specifically contains 10% potassium phosphate and 5% potassium dihydrogen phosphate, and the 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 passivating agent of the above-mentioned present embodiment, comprising the following steps: mixing clay minerals, phosphate, reducing agent, sulfide and alkaline substances according to the above mass fraction, and stirring unifo...

Embodiment 2

[0035] A kind of passivator of the present invention that is used to control heavy metal polluted soil, by mass fraction, this passivator comprises 35% clay mineral, 20% phosphate, 10% reducing agent, 15% sulfide and 20% alkaline substances. Among them, based on the total amount of passivating agent, clay minerals specifically contain 10% sepiolite, 15% montmorillonite and 10% kaolinite, and phosphate specifically contain 10% sodium phosphate and 10% sodium dihydrogen phosphate. The agent specifically contains 5% ferrous sulfate and 5% sodium thiosulfate, the sulfide specifically contains 10% sodium sulfide and 5% ferrous sulfide, and the alkaline substance specifically contains 15% calcium oxide and 5% potassium carbonate.

[0036] A preparation method of the passivating agent of the above-mentioned present embodiment, comprising the following steps: mixing clay minerals, phosphate, reducing agent, sulfide and alkaline substances according to the above mass fraction, and stir...

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Abstract

The invention discloses a passivating agent for treating heavy metal polluted soil and its preparation and application method. The passivating agent includes 30% to 50% of clay minerals, 10% to 20% of phosphate, 10% to 15% of reducing agent, 10% to 15% of sulfide and 15% to 20% % alkaline substances. The preparation method is: mixing clay mineral, phosphate, reducing agent, sulfide and alkaline substance, and stirring to obtain passivating agent. The method of use is to crush the heavy metal-contaminated soil first, then add the passivator to the crushed heavy-metal-contaminated soil, add water and stir evenly, and maintain the mixed soil in situ to make the passivator and the heavy metal in the soil fully responsive. The passivating agent of the present invention can better meet the current urgent needs of heavy metal-contaminated soil remediation in my country for strong stability, no secondary pollution, long-lasting 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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Patent Type & Authority Patents(China)
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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