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Stabilizing agent and method for treating cadmium and arsenic compound pollution waste residue/soil

A complex pollution and stabilization technology, applied in the restoration of polluted soil, chemical instruments and methods, soil conditioning materials, etc., can solve the problems of cadmium and arsenic, which are easy to seep back and difficult to deal with, and achieve low price, Prevent heavy metals from remelting, good treatment effect

Active Publication Date: 2019-05-28
HUNAN MORDEN ENVIRONMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with single-polluted heavy metal hazardous waste (soil), compound-polluted heavy metal waste (soil) is relatively difficult to deal with, especially for cadmium-arsenic compound-polluted hazardous waste (soil).
Due to the large difference in properties between arsenic and cadmium, cadmium is easy to seep back after arsenic treatment, and arsenic is easy to seep back after cadmium treatment. It is necessary to develop an efficient and economical stabilizer for the treatment of cadmium-arsenic compound pollution hazardous waste residues. up to standard

Method used

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Examples

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Effect test

Embodiment 1

[0036] The stabilizing agent of this embodiment includes quicklime, calcium peroxide and iron salt modified sepiolite with a mass ratio of 5:5:8, wherein the iron salt modified sepiolite is prepared by the following preparation method :

[0037] (1) preparation massfraction is the dilute hydrochloric acid of 5%;

[0038] (2) Add dilute hydrochloric acid to the sepiolite with a solid-to-liquid ratio of 1:5 (g / ml) and magnetically stir for 30 minutes;

[0039] (3) After stirring, let stand for 24 hours, centrifuge, wash repeatedly with distilled water until the supernatant is neutral, dry the solid obtained by centrifugation at 105° C., and then grind to obtain acid-modified sepiolite.

[0040] (4) preparation concentration is 0.2mol / L ferric sulfate solution;

[0041] (5) Add the ferric sulfate solution into the acid-modified sepiolite with a solid-to-liquid ratio of 1:5 (g / ml) and magnetically stir for 30 minutes;

[0042] (6) After stirring, let stand for 24 hours, centrif...

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Abstract

The invention discloses a stabilizing agent for treating cadmium and arsenic compound pollution waste residue / soil. The stabilizing agent is prepared from the components in percentage by mass: 20-45%of quicklime, 20-50% of calcium peroxide and 30-60% of iron salt modified clay mineral. The invention further discloses a stabilizing method for treating the waste residue / soil by the stabilizing agent. The stabilizing method comprises the steps that (1) quicklime and water are added to the cadmium and arsenic compound pollution waste residue / soil and stirred and mixed uniformly, and the waste residue / soil pH is adjusted to be larger than 7.5; (2) calcium peroxide is added, and stirred and mixed uniformly; (3) the iron-based modified clay mineral is added, and stirred and mixed uniformly; and(4) curing is performed to complete the stabilization treatment of the cadmium and arsenic compound pollution waste residue / soil. The stabilizing agent can simultaneously stabilize cadmium and arsenicin the waste residue (soil) in a solidification mode, and the treatment effect is good. The addition of calcium peroxide in the stabilizing agent can continuously and stably increase a redox potential of the waste residue, heavy metal can be effectively prevented from being re-dissolved, and excellent long-term stability is achieved.

Description

technical field [0001] The invention belongs to the field of soil heavy metal treatment, and in particular relates to a stabilizing agent and method for treating cadmium-arsenic compound polluted waste residue / soil. Background technique [0002] With the rapid economic growth, the demand for non-ferrous metals continues to increase, and the production of heavy metal waste (soil) is also increasing year by year, becoming one of the main environmental hazards. If the heavy metal waste (soil) is not properly disposed of, it will occupy a large amount of land, damage the landscape, and even affect the surrounding soil, surface water, groundwater, crops and human health with the migration of rainwater. At present, when dealing with waste slag (soil) containing heavy metals at home and abroad, after the single-polluted heavy metal hazardous waste slag (soil) is treated with better stabilizers and curing agents on the market, the leaching concentration of heavy metals in the stabil...

Claims

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Application Information

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IPC IPC(8): B09C1/08B09C1/00C09K17/06
Inventor 刘朝辉刘艳李慧晏洪铃欧阳赛蔡亮亮
Owner HUNAN MORDEN ENVIRONMENT TECH
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