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Passivant for treating high-arsenic waste residues and preparing and using methods of passivant

A passivating agent and waste slag technology, which is applied in the field of passivating agents for treating high-arsenic waste slag, can solve the problems of complex melting and solidification process, difficult on-site construction, and high treatment costs, and achieves a reduction in the compatibilization ratio and reduction in compatibilization. The effect of strong ratio and stability

Inactive Publication Date: 2019-06-28
河南川萍环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The complex melting and solidification process, the requirements of equipment materials, especially the high processing cost make it less used for the treatment of arsenic-containing waste slag
[0006] Stabilization technology is generally used in conjunction with strong chemical oxidation technology, and its disadvantages are that construction pollution is large, on-site construction is difficult, and indicators are difficult to control

Method used

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  • Passivant for treating high-arsenic waste residues and preparing and using methods of passivant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 5 parts of iron sulfate, 10 parts of fly ash, 5 parts of sodium silicate and 80 parts of kaolin according to the weight ratio, calcinate the kaolin at 1200 degrees for one hour, mix it with other components, and grind it into 200 mesh in a ball mill Above, the new material with geopolymer characteristics generated by grinding raw materials is the passivator for treating high-arsenic waste residue. The passivator prepared above was added to the high-arsenic waste slag to be treated in an arsenic slag mine in Wenshan, Yunnan Province. The added amount accounted for 3% of the weight of the high-arsenic waste slag to be treated, and the arsenic content was detected after 20 days.

Embodiment 2

[0022] Weigh 20 parts of ferrous sulfate, 30 parts of fly ash, 10 parts of sodium silicate and 40 parts of illite according to the weight ratio, calcinate kaolin at 1200 degrees for one hour, mix it with other components and grind it in a ball mill More than 200 mesh, the new material with geopolymer properties produced by grinding raw materials is the passivator for treating high-arsenic waste residue. The passivator prepared above was added to the high-arsenic waste residue to be treated in an arsenic slag mine in Wenshan, Yunnan Province. The added amount accounted for 10% of the weight of the high-arsenic waste residue to be treated, and the arsenic content was detected after 20 days.

Embodiment 3

[0024] Weigh 15 parts of iron sulfate, 10 parts of fly ash, 5 parts of sodium silicate and 70 parts of illite according to the weight ratio, calcinate kaolin at 1200 degrees for one hour, mix it with other components, and grind it in a ball mill to make 200 parts. Above the above, the new material with geopolymer characteristics generated by grinding raw materials is the passivator for treating high-arsenic waste residue. The passivator prepared above was added to the high-arsenic waste slag to be treated in an arsenic slag mine in Wenshan, Yunnan Province. The added amount accounted for 6% of the weight of the high-arsenic waste slag to be treated, and the arsenic content was detected after 20 days.

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Abstract

The invention discloses a passivant for treating high-arsenic waste residues and preparing and using methods of the passivant. The passivant is prepared from, by weight, 5-20% of ferric sulfate or ferrous sulfate, 10-30% of pulverized fuel ash, 5-10% of sodium silicate and the balance filler. According to the passivant for treating the high-arsenic waste residues, the high-molecular polymer is prepared according to a matching ratio and added into the high-arsenic waste residues, arsenic in the waste residues is induced, adsorbed and agglomerated, finally, a monotonous and stable arsenic compound is formed, and migration of the arsenic in the waste residues is controlled. Through the triple effect, stabilization of the arsenic residues is achieved, the standard for the arsenic residues to enter a landfill is met, the technical effect is better than that of traditional technologies, the cost can be reduced, and the capacity enlargement ratio is reduced. The passivant can be effective fora long time, and the rebounding phenomena of arsenic pollution cannot occur. When the passivant is in use, the chemical addition amount only needs to account for 3-10% of the weight of the high-arsenic waste residues to be treated. The construction technology is simple, only blending and hydration treatment is needed at a construction site, and the passivant is simple and environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, in particular to a passivator for treating high-arsenic waste residue and a preparation and use method thereof. Background technique [0002] Arsenic-containing waste residue mainly comes from arsenic-containing compounds (arsenic-containing oxides, sulfides, and arsenic-containing calcium salts, etc.), its toxicity is related to the chemical form of arsenic, the poisoning dose to the human body is 0.010-0.052g, and the lethal dose is 0.06 -0.20g. Among them, typical arsenic compounds, such as As 2 S 3 、As 2 o 3 , AsH 3 are highly toxic substances. The oxide of trivalent arsenic is commonly known as white arsenic or arsenic, and its chemical formula is As 4 o 6 , usually written As 2 o 3 , is the product of burning elemental arsenic or arsenic compounds, and is highly toxic. Arsenic can gradually accumulate in the body, and the incubation period ranges from several years ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/12B09C1/08
Inventor 李世华罗琳
Owner 河南川萍环保科技有限公司
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