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Method for recovering selenium from acid mud wastes of acid production with copper smelting smoke

A recovery method and copper smelting technology, which is applied in the field of selenium recovery from copper smelting flue gas acid mud waste, can solve the problems of no extraction process, high leaching temperature, large equipment investment, etc., and achieve low production cost and smooth production process. Simple, high metal recovery effect

Inactive Publication Date: 2014-01-08
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the technology of recovering selenium from acid mud produced by sulfuric acid, Kunming Metallurgical Research Institute and Xiaocai have studied the process of sodium sulfite leaching selenium in high-lead and high-selenium acid mud, and applied for a patent. This method uses a pressure leaching process, leaching The temperature is high, the equipment investment is large, and the cost is high
There are also studies on the enrichment of selenium by using the separation and smelting method, which can enrich the acid mud containing 0.1-0.3% selenium to about 1%, but does not involve the extraction process

Method used

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  • Method for recovering selenium from acid mud wastes of acid production with copper smelting smoke

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Experimental program
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Effect test

Embodiment 1

[0020] Chemical weight composition of acid mud: selenium 0.2%, lead 50%, arsenic 0.01%, bismuth 0.1%, sulfur and oxygen, carbon 50%.

[0021] Acid mud or acid mud after extracting bismuth and arsenic, add sodium hypochlorite and sodium hydroxide solution, the concentration of sodium hypochlorite solution is 8%, sodium hydroxide is 2%, the liquid-solid ratio is 15:1, and the reaction is stirred for 1.5h, and the reaction temperature is 50°C. The selenium-containing liquid is obtained by filtration, the selenium-containing liquid is combined with the existing selenium powder production process, and relatively pure lead slag is obtained after leaching.

[0022] The lead slag after deselenization is sent to the precious metal factory to recover lead and precious metals. The chemical composition of lead slag after deselenization: lead 76.88%, selenium 0.015%, arsenic 0.04%, bismuth 0.13%, silver 0.0025%, sulfur, oxygen, chlorine, sodium 23%.

Embodiment 2

[0024] Chemical weight composition of acid mud: Selenium 2%, Lead 70%, Arsenic 0.05%, Bismuth 0.5%, Sulfur and Oxygen, Carbon 27%.

[0025] Acid mud or acid mud after extracting bismuth and arsenic, add sodium hypochlorite and sodium hydroxide solution, the concentration of sodium hypochlorite solution is 12%, sodium hydroxide is 1.5%, the liquid-solid ratio is 20:1, the reaction is stirred for 1.0h, and the reaction temperature is 80°C. The selenium-containing liquid is obtained by filtration, the selenium-containing liquid is combined with the existing selenium powder production process, and relatively pure lead slag is obtained after leaching.

[0026] The lead slag after deselenization is sent to the precious metal factory to recover lead and precious metals. The chemical composition of lead slag after deselenization: lead 74.25%, selenium 0.04%, arsenic 0.02%, bismuth 0.17%, silver 0.0015%, sulfur, oxygen, chlorine, sodium 25.5%.

Embodiment 3

[0028] Chemical weight composition of acid mud: Selenium 1%, Lead 60%, Arsenic 0.05%, Bismuth 0.3%, Sulfur and Oxygen, Carbon 39%.

[0029] Acid mud or acid mud after extracting bismuth and arsenic, add sodium hypochlorite and sodium hydroxide solution, the concentration of sodium hypochlorite solution is 4%, sodium hydroxide is 4%, the liquid-solid ratio is 10:1, and the reaction is stirred for 0.5h, and the reaction temperature is 60°C. The selenium-containing liquid is obtained by filtration, the selenium-containing liquid is combined with the existing selenium powder production process, and relatively pure lead slag is obtained after leaching.

[0030] The lead slag after deselenization is sent to the precious metal factory to recover lead and precious metals. The chemical composition of lead slag after deselenization: lead 78.5%, selenium 0.15%, arsenic 0.04%, bismuth 0.17%, silver 0.0025%, sulfur, oxygen, chlorine, sodium 21.5%.

[0031] The present invention separates ...

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Abstract

The invention discloses a method for recovering selenium from acid mud wastes of acid production with copper smelting smoke. The method comprises the steps of adding the acid mud into a solution containing sodium hypochlorite and sodium hydroxide, carrying out a selenium leaching reaction, filtering to obtain selenium removed slag and a sodium selenate containing solution, recovering lead, precious metals and valuable metals from the selenium removed slag, and carrying out acidification reduction on the sodium selenate solution to obtain rough selenium powder. Before recovering the selenium from the acid mud, arsenic and bismuth are separated from the selenium and lead in the acid firstly, the selenium removing rate is higher than 95%, the lead content in the slag is increased to 70-80%, the enrichment of the valuable metal lead in the slag is beneficial for a subsequent recovering process, the process is simple, the purpose of treatment of wastes with processes of wastes against one another is realized, the circular economy is realized, the production cost is low, and the metal recovering rate is high. In particular, residual chlorine in a production process is used for absorbing sodium hypochlorite in the waste solution, and then the selenium is directly removed from the acid mud wastes, so that the selenium recovering problem is solved, and meanwhile, the sodium hypochlorite wastewater problem is also solved.

Description

technical field [0001] The invention relates to the field of recycling and utilization of chemical production waste, in particular to a method for recovering selenium in acid mud waste produced from copper smelting flue gas. Background technique [0002] The main raw material (90%) for industrial selenium extraction is anode slime produced by copper electrolytic refining, and the rest comes from calcine produced by refining lead, cobalt and nickel, and residual sludge produced by sulfuric acid. In recent years, with the substantial increase in copper production capacity, the acid production capacity of smelting flue gas accounts for an increasing proportion of sulfuric acid production. The company's smelting flue gas acid production is 2600 kt / a, and the soot purification acid sludge produced in the chemical acid production process is about There are 5500t / a, and the acid mud of copper smelting furnace is about 350t / a, which contains rare and precious metals such as selenium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/02
Inventor 王玉华张鹏黄晓元贺来荣张立岩张晗
Owner JINCHUAN GROUP LIMITED
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