Contaminated soil passivator and preparation method and application thereof

A technology of polluted soil and passivator, which is applied in the restoration of polluted soil, chemical instruments and methods, application and other directions, can solve the problem of reducing the content of available heavy metals in soil crops, poor adsorption and exchange performance of heavy metals, and complex preparation process of adsorbents and other problems, to achieve the effect of improving long-term stability, reducing dissolution and low cost

A technology of polluted soil and passivator, which is applied in the restoration of polluted soil, chemical instruments and methods, application and other directions, can solve the problem of reducing the content of available heavy metals in soil crops, poor adsorption and exchange performance of heavy metals, and complex preparation process of adsorbents and other problems, to achieve the effect of improving long-term stability, reducing dissolution and low cost

CN104560046AActive Publication Date: 2015-04-29SHANGHAI LVQIANG NEW MATERIALS CO LTD +1
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  • Contaminated soil passivator and preparation method and application thereof
  • Contaminated soil passivator and preparation method and application thereof
  • Contaminated soil passivator and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Cd, Cu, Hg complex heavy metal pollution passivation:

[0033] Take 70kg of the above-mentioned polluted soil, divide it into 7 parts, numbered S1-S6, and S1 is a blank polluted soil, add different passivating agents to S2-S6 respectively, the total addition amount is not more than 2.5kg, fully stir, so that the passivating agent and Mix the contaminated soil evenly, pour it into the prepared water agent, and ensure that the soil moisture content is 30%, keep the moisture in the stack for 7 days, and measure the leaching amount of heavy metals in the soil. The specific test results are shown in the table below:

[0034]

[0035] Class 3A small-pore molecular sieves have very poor adsorption and exchange performance for heavy metals due to the limitation of pore size. Due to the heterogeneous crystal phase and irregular pores of natural zeolite, its adsorption and exchange performance for heavy metals is not very good.

[0036] Long-term stability test of passivated...

Embodiment 2

[0039] A polluted soil passivator, which is formed by mixing the following raw materials in weight percentage: 30% of natural clay mineral material (bentonite), 60% of industrial harmless waste (blast furnace slag), and 10% of cation exchanger (X-type molecular sieve). Mix natural clay mineral materials and industrial harmless wastes, then fully mix them with cation exchangers, and crush them to less than 100 meshes to obtain polluted soil passivation agents.

[0040] The soil used for the test was taken from a polluted site in Shanghai, and the total amount of heavy metals measured was Cd122mg / kg, Cu488mg / kg, and Hg150mg / kg.

[0041] Add the passivator to the polluted soil in an amount of 20wt%, and the addition ratio of the passivator is determined according to the degree of pollution. In order to ensure that the polluted soil and the passivator are mixed evenly, the moisture content of the polluted soil must be controlled below 15%. Make passivator and polluted soil mix eve...

Embodiment 3

[0044] A polluted soil passivator, which is formed by mixing the following raw materials in weight percentage: 60% of natural clay mineral material (attapulgite), 30% of industrial harmless waste (fly ash), cation exchanger (pore diameter greater than 4A) molecular sieve) 10%. Mix natural clay mineral materials and industrial harmless wastes, then fully mix them with cation exchangers, and crush them to less than 100 meshes to obtain polluted soil passivation agents.

[0045] The application of polluted soil passivator, in polluted soil, apply passivator by the addition amount of 15wt%, and wherein the addition ratio of passivator is determined according to pollution degree, in order to guarantee that polluted soil and passivator are mixed evenly, polluted soil The moisture content needs to be controlled below 15%; the passivating agent and the polluted soil are evenly mixed, poured into the prepared mixed acid solution of nitric acid and sulfuric acid with a pH value of 6, an...

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Abstract

The invention relates to a contaminated soil passivator and a preparation method and application thereof. The passivator is formed by mixing the following raw materials in percentage by weight: 30-60 percent of a natural clay mineral material, 30-60 percent of industrial harmless wastes and 10-20 percent of a cation-exchanger, wherein the cation-exchanger refers to an X-type molecular sieve or a molecular sieve with the particle size of more than 4A. Compared with the prior art, the passivator disclosed by the invention is completely prepared from the natural clay mineral material and a mineral-like material, the cost is low, secondary pollution is avoided, the environment friendliness idea is completely achieved, the pulverized fuel ash and other industrial wastes are introduced, the problems such as waste storage and treatment are solved, and the passivator has good passivation effect and high long-term stability on the contaminated soil, particularly heavy metal contaminated soil, and is suitable for large-scale popularization and application.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and relates to the passivation or harmless treatment of polluted soil, in particular to a polluted soil passivator and its preparation method and application. Background technique [0002] In recent years, due to the frequent occurrence of major environmental events such as cadmium rice, blood lead, and cancer villages, the problem of heavy metal pollution in soil and groundwater has attracted more and more attention. From the perspective of the formation process and mechanism of heavy metal-contaminated soil, the process of eradicating pollution must be long-term and gradual. Therefore, it is urgent to develop a treatment method that is efficient, environmentally friendly, and cost-effective. [0003] The solidification / stabilization repair technology has been widely used in Europe and the United States because of its advantages such as wide application range, short processing ti...

Claims

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Application Information

Patent Timeline
29 Apr 2015
Publication
CN104560046A
IPC
C09K17/04; C09K17/06; C09K17/08; B09C1/08
CPC
B09C1/08; C09K17/04; C09K17/06; C09K17/08
Inventors
胑杰; εΎεŽθƒœ