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Arsenic sulfide residue transformation and microcapsule curing stabilization method

A microcapsule solidification and arsenic sulfide technology, applied in microcapsule preparations, chemical instruments and methods, fixed on or in inorganic carriers, etc., to achieve good stability, reduced toxicity, and low toxicity

Active Publication Date: 2019-03-22
BEIJING GEOENVIRON ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for transformation of arsenic sulfide slag and high-efficiency microcapsule solidification and stabilization for the existing problems in the treatment of arsenic sulfide slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: A method for transforming arsenic sulfide slag and solidifying and stabilizing microcapsules provided in this embodiment includes the following steps:

[0036] Step 1: Prepare arsenic trioxide from arsenic sulfide slag. First, add the arsenic sulfide slag to sulfuric acid solution with a concentration of 50% (mass fraction), the liquid-solid mass ratio is 5:1, and carry out stirring and slurrying in the slurrying tank, wherein the stirring speed is 300rpm / min, and the stirring time is 1h. After the slurrying is completed, the slurry is pumped into the high-pressure reaction kettle, and a sulfuric acid solution with a concentration of 70% (mass fraction) is added to adjust the liquid-solid mass ratio in the reaction kettle to 7:1, and the temperature in the kettle is 150°C. Oxygen, the oxygen partial pressure is controlled to 0.6MPa, and the arsenic sulfide slag is subjected to pressurized oxidation leaching, and the leaching reaction time is 3h. After the...

Embodiment 2

[0047] Embodiment 2: A method for transforming arsenic sulfide slag and solidifying and stabilizing microcapsules provided in this embodiment includes the following steps:

[0048] Step 1: Prepare arsenic trioxide from arsenic sulfide slag. First, add the arsenic sulfide slag to sulfuric acid solution with a concentration of 50% (mass fraction), the liquid-solid mass ratio is 5:1, and carry out stirring and slurrying in the slurrying tank, wherein the stirring speed is 500rpm / min, and the stirring time is 2h. The slurry after slurrying is pumped into the high-pressure reaction kettle, and a sulfuric acid solution with a concentration of 70% (mass fraction) is added to adjust the liquid-solid mass ratio in the reaction kettle to 7:1, and the temperature in the kettle is 160°C. Oxygen, the oxygen partial pressure is controlled to 0.7MPa, and the arsenic sulfide slag is subjected to pressurized oxidation leaching, and the leaching reaction time is 4h. After the reaction is finis...

Embodiment 3

[0059] Embodiment 3: A method for transforming arsenic sulfide slag and solidifying and stabilizing microcapsules provided in this embodiment includes the following steps:

[0060] Step 1: Prepare arsenic trioxide from arsenic sulfide slag. First, add the arsenic sulfide slag to sulfuric acid solution with a concentration of 50% (mass fraction), the liquid-solid mass ratio is 5:1, and carry out stirring slurry in the slurrying tank, wherein the stirring speed is 450rpm / min, and the stirring time is 1.5h. The slurry after slurrying is pumped into the autoclave, and sulfuric acid solution with a concentration of 70% (mass fraction) is added to adjust the liquid-solid mass ratio in the autoclave to 7:1, and the temperature in the autoclave is 158°C. Oxygen, the oxygen partial pressure is controlled to 0.67MPa, and the arsenic sulfide slag is subjected to pressurized oxidation leaching, and the leaching reaction time is 3.5h. After the reaction is finished, filter to realize soli...

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Abstract

The invention provides an arsenic sulfide residue transformation and microcapsule curing stabilization method. The arsenic sulfide residue transformation and microcapsule curing stabilization method comprises the following steps that (1) arsenic sulfide residues are used as raw materials to prepare arsenic trioxide; (2) the arsenic trioxide is used as the raw material to prepare 4-hydroxy-3-nitrophenylarsonic acid; (3) an iron-manganese binuclear clustered metal arsonate compound of a porous structure is prepared; (4) silicon coating is conducted on the surface of the iron-manganese binuclearclustered metal arsonate compound of the porous structure; (5) Fe(0) / Al-SBA-15 mesoporous compound stabilizing agent is compounded by means of a hydrothermal reaction; (6) microcapsule curing stabilization treatment is conducted on the iron-manganese binuclear clustered metal arsonate compound with the surface coated with silicon. According to the arsenic sulfide residue transformation and microcapsule curing stabilization method, the 4-hydroxy-3-nitrophenylarsonic acid is prepared through transformation, the metal arsonate compound of the porous structure is prepared finally, compared with atraditional arsenic compound, the prepared metal arsonate compound has the features of being good in stability and low in toxicity, and the toxicity of the arsenic compound is greatly lowered.

Description

technical field [0001] The invention relates to a treatment and disposal method for arsenic sulfide slag, in particular to a method for transforming arsenic sulfide slag and solidifying and stabilizing microcapsules, which belongs to the field of hazardous waste treatment and is suitable for the treatment of arsenic-containing waste. Background technique [0002] In the process of chemical and metallurgical production, a large amount of high-arsenic polluted acid is usually produced, and the sulfide precipitation method is usually used to remove arsenic in the waste liquid to obtain arsenic sulfide slag. At present, solidification stabilization is a technology commonly used at home and abroad to treat arsenic sulfide slag. Inorganic materials such as cement and lime are usually used for solidification. Due to the large amount of cement added, the volumetric expansion ratio of the solidified product is large, resulting in high disposal costs. [0003] Patent CN102151690A disc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00C01B37/02C01B33/126C12N11/02B09B3/20B09B3/40C09D7/62B01J13/04B82Y30/00C01P2004/84C01P2006/14C12N11/14
Inventor 霍成立熊辉刘力奇刘泽军甄胜利贺真刘超
Owner BEIJING GEOENVIRON ENG & TECH
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