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Method for selectively separating arsenic trioxide from non-ferrous metal smelter off-gas

A technology for arsenic trioxide and smelting flue gas, applied in chemical instruments and methods, inorganic chemistry, arsenic compounds, etc., can solve the problems of increased toxicity, air pollution, and high treatment costs, achieve high separation rate, avoid smoke and dust treatment, and high purity Effect

Inactive Publication Date: 2014-02-19
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The chemical treatment of arsenic solid waste is costly and some will cause air pollution
In addition, under biological action, after inorganic arsenic is converted into volatile methyl arsenic, its toxicity will increase significantly. Therefore, there is currently no suitable biological method for treating hazardous solid waste containing arsenic

Method used

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  • Method for selectively separating arsenic trioxide from non-ferrous metal smelter off-gas

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the block diagram of technological process shown in accompanying drawing, and in conjunction with examples.

[0013] The method for extracting arsenic trioxide from nonferrous metal smelting flue gas comprises the following steps:

[0014] (1) Fill the arsenic-containing material according to the capacity of the converter, raise the temperature in the furnace to 200°C and keep it warm for 60 minutes, the moisture in the arsenic-containing material in the furnace becomes water vapor and is discharged by the fan.

[0015] (2) After the next process, raise the furnace temperature to 900~1100°C and keep it warm for 60~120 minutes. Under this temperature condition, the arsenic-containing material is oxidized into arsenic trioxide gas, and other metals are oxidized into oxides. The smoke enters in sequence Purified in the surface cooler and electrostatic precipitator, the purified high-temperature flue ...

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Abstract

The invention relates to a method for selectively separating arsenic trioxide from non-ferrous metal smelter off-gas, and belongs to the technical field of the non-ferrous metallurgy. The method is mainly characterized in that the off-gas enters a high temperature membrane module at a temperature of 500-700DEG C, so a gas traverses through a membrane filter core, and dusts are intercepted and adsorbed by a membrane through inertial impaction and the interception or diffusion effect to realize gas-solid separation. The method has the advantages of reasonable, controllable and stable process flow, high arsenic separation rate, high purity of the obtained arsenic extraction product, and no arsenic pollution in the smelting process.

Description

technical field [0001] The invention relates to a method for selectively separating arsenic trioxide from nonferrous metal smelting flue gas, belonging to the field of nonferrous metal metallurgy. Background technique [0002] In recent years, countries have paid more and more attention to arsenic pollution, and the requirements for environmental protection have also become higher and higher, making non-ferrous smelting enterprises require a limited amount of arsenic in the concentrate used. However, since arsenic and copper, lead, zinc, cobalt, tin, antimony, gold and silver often co-exist together, it cannot be completely separated by general beneficiation methods, and some arsenic inevitably enters the concentrate. The arsenic-containing fumes produced by the non-ferrous metallurgical industry mainly come from the smelting, roasting or waste residue fuming recovery process of arsenic-containing ores in the extraction of heavy metals such as copper, lead, zinc, cobalt, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B30/04C01G28/00
CPCY02P10/20
Inventor 谢兆凤刘万里覃小龙谭霖柴承平
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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