Stable solidification method of arsenic-containing waste residues

A solidification method and waste residue technology, which is applied in the field of hazardous solid waste treatment and disposal, can solve the problems of complex process operation and reduced toxicity of arsenic-containing waste slag leaching, and achieve the effects of simple process operation, shortened curing time, and high compressive strength

CN109226210AActive Publication Date: 2019-01-18西安同鑫伟业环保科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-01-18

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Abstract

The invention provides a stable solidification method of arsenic-containing waste residues. According to the method provided by the invention, the arsenic-containing waste residues and a soil solidifying agent are combined, so that the arsenic-containing waste residues are solidified in a high-strength solidified body, and the leaching toxicity of the arsenic-containing waste residues is reduced;the leaching rate of solidified arsenic can reach related requirements of Identification Standards for Hazardous Wastes-Identification for Extraction Toxicity (GB5085.3-2007), so that the arsenic-containing waste residues are changed into common solid wastes, stable solidification treatment of the arsenic-containing waste residues is realized, and furthermore, the aim of safety stacking is realized; the method is simple to operate, economical and environmentally friendly; the environment pollution problem caused by the arsenic-containing waste residues in the prior art is solved.
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Description

technical field

[0001] The invention belongs to the technical field of hazardous solid waste treatment and disposal, and in particular relates to a method for stably solidifying arsenic-containing waste residue. Background technique

[0002] Arsenic is widely distributed in nature, mostly associated with copper, lead, zinc and other deposits in the form of sulfide. During the smelting process of metal ore, the arsenic-containing wastewater, waste gas and waste residue will pollute the environment. Among them, the toxicity of elemental arsenic is extremely low, but all arsenic compounds are toxic, and the toxicity of trivalent arsenic compounds is stronger than that of other arsenic compounds. Therefore, hazardous solid waste such as arsenic slag must be stabilized and solidified before storage.

[0003] Before the hazardous solid waste is processed and disposed of, it must be solidified first, which is to use physical or chemical methods to immobilize or contain toxic and ...

Examples

Embodiment 1

[0038] A soil stabilizer, each component in parts by weight, comprises:

[0039]

[0040] In this embodiment, a method for stabilizing arsenic-containing waste residues, combining arsenic-containing waste residues with a soil stabilizer, includes the following steps:

[0041] S1, configuring a soil curing agent, adding water to the components in the above parts by weight and stirring them evenly;

[0042] S2, adding the arsenic-containing waste residue into the mixer;

[0043] The arsenic-containing waste residue mainly contains arsenic sulfide, and also contains a small amount of other free arsenates. The arsenic-containing waste residue has a high water content and is in the form of sludge. It can be directly added to the mixer without crushing.

[0044] S3. Add the aqueous solution of each component configured in step S1 to the mixer in turn, and stir for 3-5 minutes;

[0045] The stirring process is carried out at normal temperature (15-25°C). During the stirring proc...

Embodiment 2

[0060] A soil stabilizer, each component in parts by weight, comprises:

[0061]

[0062] Among them, the phosphate is preferably sodium phosphate, the water reducer is preferably sulfamate and sodium lignosulfonate, the waterproofing agent is preferably sodium silicate, and the reinforcing agent is preferably sodium carboxymethyl cellulose and hydroxyethyl cellulose.

[0063] In this embodiment, a method for stabilizing arsenic-containing waste residues, combining arsenic-containing waste residues with a soil stabilizer, includes the following steps:

[0064] S1, configuring a soil curing agent, adding water to the components in the above parts by weight and stirring them evenly;

[0065] S2, adding the arsenic-containing waste residue into the mixer;

[0066] S3. Add the aqueous solution of each component configured in step S1 to the mixer in turn, and stir for 3-5 minutes;

[0067] S4. Add auxiliary binder, stir for 10-20 minutes, then add appropriate amount of water, ...

Embodiment 3

[0077] A soil stabilizer, each component in parts by weight, comprises:

[0078]

[0079] Among them, the phosphate is preferably sodium phosphate and potassium dihydrogen phosphate, the water reducing agent is preferably sodium lignosulfonate, calcium lignosulfonate and sodium naphthalenesulfonate condensate, the waterproofing agent is preferably sodium silicate, and the reinforcing agent is preferably Sodium carboxymethylcellulose and hydroxyethylcellulose.

[0080] In this embodiment, a method for stabilizing arsenic-containing waste residues, combining arsenic-containing waste residues with a soil stabilizer, includes the following steps:

[0081] S1, configuring a soil curing agent, adding water to the components in the above parts by weight and stirring them evenly;

[0082] S2, adding the arsenic-containing waste residue into the mixer;

[0083] S3. Add the aqueous solution of each component configured in step S1 to the mixer in turn, and stir for 5-10 minutes;

...