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Method for preparing arsenic trioxide from arsenic-rich slag

An arsenic trioxide and arsenic-rich technology, which is applied in the field of preparation of arsenic trioxide, can solve the problems of high reaction temperature and unsuitability for industrial production, and achieve the effects of low reaction temperature, good operability and application prospects, and cost reduction

Inactive Publication Date: 2020-06-23
BLACK P2 USA INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The wastewater produced after the above wet treatment still contains arsenic, halogen and other substances, and the reaction temperature is high, which increases the requirements and loss of equipment while realizing the leaching of arsenic, and is not suitable for industrial production

Method used

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  • Method for preparing arsenic trioxide from arsenic-rich slag
  • Method for preparing arsenic trioxide from arsenic-rich slag
  • Method for preparing arsenic trioxide from arsenic-rich slag

Examples

Experimental program
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Effect test

Embodiment 1

[0045] A method for preparing arsenic trioxide from arsenic-rich slag, comprising the steps of:

[0046] (1) Pretreatment of arsenic-rich slag: crushing and grinding the arsenic-rich slag into mineral powder, putting the mineral powder into a compound agent for leaching reaction, and then introducing air and oxygen to react. After the reaction, an oxidative desulfurization solution is obtained; After heating, evaporating and concentrating, add 2g / L decolorizing agent for decolorizing, and filter out the filter residue to obtain the pretreatment solution; the compounding agent is obtained by mixing NaOH and NaClO in a molar ratio of 4:3; the slag and The molar ratio of the compounding agent is 6:1; the decolorizing agent is a mixture of coconut shell activated carbon, coal-based activated carbon, and diatomaceous earth in a mass ratio of 8:2:1;

[0047] (2) Reduction process: After adjusting the pH of the pretreatment solution to 0, intermittently feed sulfur dioxide gas at a r...

Embodiment 2

[0054] A method for preparing arsenic trioxide from arsenic-rich slag, comprising the steps of:

[0055] (1) Pretreatment of arsenic-rich slag: crushing and grinding the arsenic-rich slag into mineral powder, putting the mineral powder into a compound agent for leaching reaction, and then introducing air and oxygen to react. After the reaction, an oxidative desulfurization solution is obtained; After heating, evaporating and concentrating, add 2.5g / L decolorizing agent for decolorization, and filter out the filter residue to obtain the pretreatment solution; the compounding agent is obtained by mixing NaOH and NaClO in a molar ratio of 5:4; the slag The molar ratio to the complexing agent is 18:1; the decolorizing agent is a mixture of coconut shell activated carbon, coal-based activated carbon, and diatomaceous earth in a mass ratio of 18:6:1;

[0056] (2) Reduction process: After adjusting the pH of the pretreatment solution to a value of 3, intermittently feed sulfur dioxid...

Embodiment 3

[0061] A method for preparing arsenic trioxide from arsenic-rich slag, comprising the steps of:

[0062] (1) Pretreatment of arsenic-rich slag: crushing and grinding the arsenic-rich slag into mineral powder, putting the mineral powder into a compound agent for leaching reaction, and then introducing air and oxygen to react. After the reaction, an oxidative desulfurization solution is obtained; After heating, evaporating and concentrating, add 2.2g / L decolorizing agent for decolorization, and filter out the filter residue to obtain the pretreatment solution; the compounding agent is obtained by mixing NaOH and NaClO according to a molar ratio of 4.5:3.7; the slag The molar ratio of the compounding agent is 12:1; the decolorizing agent is a mixture of coconut shell activated carbon, coal-based activated carbon, and diatomaceous earth in a mass ratio of 13:4:1;

[0063] (2) Reduction process: After adjusting the pH of the pretreatment solution to 2, intermittently feed sulfur di...

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Abstract

The invention discloses a method for preparing arsenic trioxide from arsenic-rich slag, which belongs to the technical field of arsenic slag recovery processes, and comprises the following steps: on the basis of research on recovery of waste arsenic slag, recycling NaOH and NaClO as composite leachate in the form of As2O3 by reduction and freezing crystallization processes, and circularly extracting the recovered residual liquid. The method is simple to operate under the process conditions, short in reaction time, high in arsenic recovery rate and free of secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of arsenic slag recovery technology, in particular to a method for preparing arsenic trioxide from arsenic-rich slag. Background technique [0002] In response to the current rapid development of the chemical industry, more and more arsenic is discharged into the environment during the production process of metal smelting and phosphoric acid preparation, causing pollution and wasting resources. At present, my country has stipulated the sanitary standards for arsenic: the daily concentration of arsenic in the atmosphere of residents is 0.003mg / m 3 , the arsenic content in drinking water is less than or equal to 0.04mg / L, the maximum allowable discharge concentration of industrial wastewater is 0.5mg / L, and the arsenic content in food is limited within the range of 0.1-0.2mg / kg. Guangxi has more than 100 tons of phosphoric acid arsenic-rich slag that needs to be treated every year. If it is just a simple tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G28/00C01D5/00
CPCC01G28/005C01D5/00
Inventor 苏念英黎铉海谢元健林明曾云彬梁家英
Owner BLACK P2 USA INC
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