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Large-particle desorption agent for treating cadmium-contaminated soil as well as preparation and application methods

A technology for cadmium-contaminated soil and a desorbent, which is applied in the field of cadmium pollution and can solve problems such as secondary pollution

Inactive Publication Date: 2021-04-20
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Aiming at the defect that the stable solidification method used in the existing treatment of industrial cadmium-contaminated soil is prone to secondary pollution, the first purpose of the present invention is to provide a method for preparing a large-particle desorbent for the treatment of cadmium-contaminated soil

Method used

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  • Large-particle desorption agent for treating cadmium-contaminated soil as well as preparation and application methods
  • Large-particle desorption agent for treating cadmium-contaminated soil as well as preparation and application methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1). 2.5Kg organic sulfide sodium dimethyl dithiocarbamate and 4Kg lime, 2.5Kg zeolite powder, and 8Kg straw powder are added to the agglomerator, and the polyacrylamide glue aggregate is sprayed. The mass concentration of the polyacrylamide glue 18% to obtain spherical particles with a diameter of 5-10mm;

[0039] (2). Pass 2000g of Portland cement, 100g of silica powder, and 500g of waste glass powder through a vortex airflow pulverizer, refine and compound them under the impact of airflow, and obtain a coating agent;

[0040] (3). The coating agent obtained in step (2) and water are prepared into a slurry at a mass ratio of 1:3, and the surface of the spherical particles obtained in step (1) is sprayed and coated, and the spraying amount is 15% of the mass of the spherical particles. %, vibrated and dried on a vibrating sieve at 75°C to obtain a large particle desorbent for treating cadmium-contaminated soil.

Embodiment 2

[0042] (1). 2.5Kg organic sulfide sodium dimethyl dithiocarbamate and 3Kg lime, 2.5Kg zeolite powder, and 8Kg straw powder are added to the agglomerator, and the polyacrylamide glue aggregate is sprayed. The mass concentration of the polyacrylamide glue 18% to obtain spherical particles with a diameter of 5-10mm;

[0043] (2). Pass 2000g of Portland cement, 100g of silica powder, and 500g of waste glass powder through a vortex airflow pulverizer, refine and compound them under the impact of airflow, and obtain a coating agent;

[0044] (3). The coating agent obtained in step (2) and water are prepared into a slurry at a mass ratio of 1:3, and the surface of the spherical particles obtained in step (1) is sprayed and coated. The amount of spray coating is 12% of the mass of the spherical particles. %, vibrated and dried on a vibrating sieve at 75°C to obtain a large particle desorbent for treating cadmium-contaminated soil.

Embodiment 3

[0046] (1). 2Kg organic sulfide sodium dimethyl dithiocarbamate and 4Kg lime, 2Kg zeolite powder, and 8Kg straw powder are added to the agglomerator, and the polyacrylamide glue aggregate is sprayed. The mass concentration of the polyacrylamide glue is 18 %, to obtain spherical particles with a diameter of 5-10 mm;

[0047] (2). Pass 2000g of Portland cement, 160g of silica powder, and 500g of waste glass powder through a vortex airflow pulverizer, refine and compound them under the impact of airflow, and obtain a coating agent;

[0048] (3). The coating agent obtained in step (2) and water are prepared into a slurry at a mass ratio of 1:3, and the surface of the spherical particles obtained in step (1) is sprayed and coated, and the spraying amount is 10% of the mass of the spherical particles. %, vibrated and dried on a vibrating sieve at 75°C to obtain a large particle desorbent for treating cadmium-contaminated soil.

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Abstract

The invention belongs to the technical field of cadmium pollution, and particularly relates to a large-particle desorption agent for treating cadmium-polluted soil and preparation and application methods. The preparation method of the large-particle desorption agent for treating the cadmium-contaminated soil comprises the following steps: (1) adding organic sulfide, lime, zeolite powder and straw powder into an aggregating machine, and spraying polyacrylamide glue for aggregating to obtain spherical particles with the diameter of 5-10mm; (2) allowingsilicate cement, silicon micropowder and waste glass powder to be subjected to thinning and compounding under the impact of air flow by a vortex air flow crusher to obtain a coating agent; and (3) adding water into the coating agent obtained in the step (2) to prepare slurry, spraying and coating the surfaces of the spherical particles obtained in the step (1), and carrying out vibration drying by virtue of a vibrating screen at 70-80 DEG C, so as to obtain the large-particle desorption agent for treating the cadmium-contaminated soil. Heavy metal cadmium in the slurry is fixed in the desorption agent and separated from the slurry, and the purpose of thoroughly removing the heavy metal cadmium is achieved.

Description

technical field [0001] The invention belongs to the technical field of cadmium pollution, and in particular relates to a large particle desorbing agent for treating cadmium-contaminated soil and a preparation and application method. Background technique [0002] Soil cadmium pollution has become the hardest hit area of ​​heavy metal pollution in soil, especially with the use of a large amount of cadmium in industry, mining, smelting, dust discharge, wastewater seepage, etc. have produced a large amount of industrial cadmium-contaminated soil. [0003] The main principle of remediation of heavy metal-contaminated farmland soil is to reduce the total amount of heavy metals or change their storage forms in the soil, reducing their mobility and bioavailability. By adding a passivating agent, through a series of processes such as adsorption, precipitation, complexation, ion exchange and redox, the mobility and bioavailability of heavy metal pollutants are reduced, so as to achiev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/00C09K17/40
Inventor 曾军堂陈庆司文彬李钧
Owner CHENDU NEW KELI CHEM SCI CO LTD
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