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Method of recovering selenium

A technology for recovering selenium and crude selenium, which is applied in the field of selenium recovery, can solve the problems of unsatisfactory selenium recovery rate, high consumption of raw materials, increased production costs, etc., and achieve the effects of solving cost increases, increasing economic benefits, and saving production costs

Inactive Publication Date: 2007-03-07
JINCHUAN GROUP LIMITED
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the use of sulfur dioxide gas in the extraction process, the environmental pollution is relatively large; the absorption of liquid alkali is used, and the consumption of raw materials is relatively high
The recovery rate of selenium by sulfated roasting-reduction method is not very ideal, some selenium enters the washing water and copper separation liquid, the loss of selenium in the copper separation liquid accounts for about 6.5%, and the waste water accounts for 6.3%.
The cost of processing the selenium-refined solution is high. If the washing water is directly discharged outside, it will easily cause serious environmental pollution; the copper separation solution enters the next process, which needs to be deeply removed, which will increase the production cost.
Since waste gas, waste liquid, and copper separation liquid are all treated separately in the original process, the selenium in them cannot be recovered

Method used

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  • Method of recovering selenium

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Embodiment 1

[0015] Take the waste liquid produced in the selenium refining process, in which: copper sulfate is the main component in the copper separation solution, containing 0.50 g / L of selenium; the waste water contains 0.03 g / L of selenium; first, the copper separation solution and the waste water are added to the reaction kettle for heating At 50°C, fully stirred, the waste gas generated during the selenium refining process and the selenium in the waste liquid are introduced for reduction reaction, aging and precipitation, and then filtration, drying, and returning to the anode slime, and sulfation roasting to recover selenium. The remaining copper separation liquid filtrate mainly contains copper sulfate, which is used as the raw material of copper sulfate. Since the selenium in the copper sulfate is reduced and recovered, the process of removing selenium is omitted, thereby reducing the production cost of copper sulfate and improving the product quality. added value. The selenium ...

Embodiment 2

[0017] Take the waste liquid produced in the selenium refining process, in which: copper sulfate, the main component in the copper separation solution, contains 2.5 g / L of selenium; the waste water contains 0.1 g / L of selenium; first, the copper separation solution and waste water are added to the reaction kettle for heating At 90°C, fully stirred, the waste gas generated during the selenium refining process and the selenium in the waste liquid are introduced for reduction reaction, aging and precipitation, and then filtration, drying, and returning to the anode slime ingredient, and sulfation roasting to recover selenium. The remaining copper separation liquid filtrate mainly contains copper sulfate, which is used as the raw material of copper sulfate. Since the selenium in the copper sulfate is reduced and recovered, the process of removing selenium is omitted, thereby reducing the production cost of copper sulfate and improving the product quality. added value. The selenium...

Embodiment 3

[0019] Take the waste liquid produced in the selenium refining process, in which: copper sulfate, the main component in the copper separation solution, contains 1.5 g / L of selenium; the waste water contains 0.06 g / L of selenium; first, the copper separation solution and waste water are added to the reaction kettle for heating At 70°C, fully stirred, the waste gas generated in the selenium refining process was introduced into the selenium for a reduction reaction with the selenium in the waste liquid, aged and precipitated, then filtered, dried, returned to the anode slime ingredient, and sulfated and roasted to recover selenium. The remaining copper separation liquid filtrate mainly contains copper sulfate, which is used as the raw material of copper sulfate. Since the selenium in the copper sulfate is reduced and recovered, the process of removing selenium is omitted, thereby reducing the production cost of copper sulfate and improving the product quality. added value. The se...

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Abstract

The invention discloses a selenium extracting method from washing water and copper liquid, which comprises the following steps: heating waste liquid with selenium to 50-90 deg.c; aerating sulfur dioxide; stirring to react for 3-12h; sedimenting; filtering; drying to obtain rough selenium material; returning to allocating course to extract selenium.

Description

technical field [0001] A method for recovering selenium relates to a method for extracting selenium from washing water and copper-separating solution formed from copper anode slime in a copper electrolysis production process to extract selenium. Background technique [0002] Due to the unique and excellent physical and chemical properties of selenium, selenium is widely used in electronics, glass ceramics, chemistry, metallurgy, medical care, IT and other industries. In recent years, with the increasing application of selenium, the demand for selenium has also increased, resulting in an increase in the consumption demand of selenium year by year. [0003] Due to the low grade of selenium in natural raw ore, most methods for extracting selenium are from copper anode slime formed during copper electrolysis production. The specific method is to use the sulfated roasting-reduction process for refining. Due to the use of sulfur dioxide gas in the extraction process, the environ...

Claims

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Application Information

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IPC IPC(8): C01B19/02
Inventor 夏毅祖爱国郭小英陈真华
Owner JINCHUAN GROUP LIMITED