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A stabilizing agent and method for treating cadmium-arsenic compound polluted waste residue/soil

A technology for compound pollution and treatment method is applied in the field of stabilization agents for treating cadmium-arsenic compound-polluted waste residue/soil, which can solve the problems of arsenic and cadmium being easy to re-infiltrate, and difficult to deal with, so as to prevent heavy metal re-dissolution and reduce the cost of Inexpensive, good treatment effect

Active Publication Date: 2021-10-26
HUNAN MORDEN ENVIRONMENT TECH
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  • 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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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) Stand still for 24 hours after stirring, centrifuge, wash repeatedly with distilled water until the supernatant is neutral, dry the solid obtained by centrifugation at 105° C. and 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, centrifuge, ...

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Abstract

The invention discloses a stabilizing agent for treating cadmium-arsenic compound polluted waste residue / soil, which comprises: 20-45% of quicklime, 20-50% of calcium peroxide and 30-30% of iron salt modified clay mineral in terms of mass content. 60%. The invention also discloses a method for stabilizing the waste residue / soil with the stabilizing agent: 1) adding quicklime and water to the cadmium-arsenic compound polluted waste residue / soil, stirring and mixing evenly, and adjusting the pH value of the waste residue / soil to pH>7.5; 2) Add calcium peroxide, stir and mix evenly; 3) Add iron-based modified clay minerals, stir and mix evenly; 4) Curing, complete the stabilization treatment of cadmium-arsenic compound polluted waste residue / soil. The stabilizing agent of the invention can solidify and stabilize the cadmium and arsenic in the waste residue (soil) at the same time, and has good treatment effect. The addition of calcium peroxide in the stabilizing agent can continuously and stably increase the oxidation-reduction potential of the waste residue, which can effectively prevent heavy metals from re-dissolving, and has excellent long-term stability.

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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Patent Type & Authority Patents(China)
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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