Method for extracting selenium from selenium-contained material

A process method and technology of process steps, applied in the direction of elemental selenium/tellurium, etc., can solve the problems of high copper content, low qualified rate of electrolytic silver powder, incomplete selenium precipitation, etc., and achieve shortening of technological process, reduction of production cost, and improvement of qualified rate Effect

Active Publication Date: 2011-06-08
JINCHUAN GROUP LIMITED
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Problems solved by technology

In the process of processing the copper anode slime pressurized leaching solution, the end point of selenium precipitation is not easy to detect. When the selenium content of the solution is particularly low, an excessive amount of copper powder is needed to replace a small amount of selenium, otherwise the selenium precipitation will not be complete. As a result, the selenium slag produced contains more than 30% copper, which i

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  • Method for extracting selenium from selenium-contained material
  • Method for extracting selenium from selenium-contained material

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Embodiment 1

[0020] (1) First, add the dried selenium residue containing silver, copper, lead, and tellurium impurities into the reactor, add water to make slurry, turn on the stirring, and then slowly add sodium sulfite to control the liquid-solid ratio of the solution to 10:1, and the concentration of sodium sulfite 1mol / l, then add liquid alkali to adjust the pH value of the solution to 10;

[0021] (2) Stir and heat up, control the reaction temperature at 95°C, react for 1 hour, filter after the reaction is complete, and further recover selenium from the filtrate, so that selenium can be dissolved in alkaline sodium sulfite solution to form sodium selenosulfate which is easily soluble in water, while silver , copper and other impurities remain in the solution in solid form;

[0022] (3) Add sodium selenosulfate filtrate into the reaction kettle, add sulfuric acid reagent, adjust the final pH value of the solution to 4, start to heat up, turn on the stirring, and adjust the temperature ...

Embodiment 2

[0025] (1) First, add the dried selenium slag containing silver, copper, lead, and tellurium impurities into the reaction kettle, add water to make slurry, turn on the stirring, and then slowly add sodium sulfite to control the liquid-solid ratio of the solution to 20:1 and the concentration of sodium sulfite 2mol / l, then add liquid alkali to adjust the pH value of the solution to 12;

[0026] (2) Stir and heat up, control the reaction temperature at 90°C, react for 2 hours, filter after the reaction is complete, and further recover selenium from the filtrate, so that selenium can be dissolved in alkaline sodium sulfite solution to form sodium selenosulfate which is easily soluble in water, while silver , copper and other impurities remain in the solution in solid form;

[0027] (3) Add sodium selenosulfate filtrate into the reaction kettle, add sulfuric acid reagent, adjust the final pH value of the solution to 5, start to heat up, turn on the stirring, and adjust the tempera...

Embodiment 3

[0030] (1) First, add the dried selenium slag into the container, add water to slurry, turn on the stirring, and then slowly add sodium sulfite, control the liquid-solid ratio of the final solution to 20:1, and the concentration of sodium sulfite to 2mol / l, then add liquid alkali to adjust the solution The pH value is 12;

[0031] (2) Control the reaction temperature at 90°C and react for 2 hours. After the reaction is complete, filter and wash to remove impurity elements in the solution;

[0032] (3) Add sulfuric acid to the filtrate to adjust the pH value to 4, stir and heat up, adjust the temperature to 75°C, react for 2 hours, filter and wash the solution to obtain crude selenium with a purity of not less than 80%.

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Abstract

The invention relates to a method for extracting selenium from selenium-deposited residue. The method comprises the following steps of: dissolving selenium-deposited residue to an alkaline sodium sulfite solution, generating water-soluble seleno sodium sulfate through a reaction between elemental selenium and the sodium sulfite solution; fully reacting the seleno sodium sulfate under the acidification of sulfuric acid to obtain a selenium elemental precipitate; and washing and drying to obtain coarse selenium with the purity of about 90 percent. The invention realizes separation of copper, silver and selenium in the selenium residue, and the separated selenium can be directly refined due to higher purity, therefore, the process flow of selenium recovery is shortened, the recovery rate is increased, and the production cost is decreased; the trouble of high copper content of an anode plate in silver electrolysis in the gold and silver refining process is solved and the pass rate of primary silver powder electrolysis is increased. The invention can be applied to recovering and extracting selenium from materials, such as selenium-contained residue generated in the technical process by using a wet method for treatment or selenium-contained acid mud generated in the production process of the copper anode slime by using a pyrogenic method for treatment and can also be applied to the production of high-purity selenium products by directly purifying a coarse selenium raw material.

Description

technical field [0001] The technology relates to the field of metallurgical technology, especially the technology for extracting crude selenium from raw materials containing silver, selenium, copper, lead, tellurium and other elements, specifically a process for separating and extracting selenium from materials containing selenium. Background technique [0002] At home and abroad, rotary kilns are often used to process copper anode slime, and sulfuration roasting is used to steam selenium to extract crude selenium. Now some enterprises use pressure leaching-fire smelting process to extract crude selenium. The main process is: copper anode slime is pressurized Leaching, the output leaching solution is replaced by copper powder to recover silver and selenium, the silver-selenium slag and the pressurized slag after pressure leaching are put into the Caldo furnace for smelting, and crude selenium is produced from the pyro-smelting flue gas recovery system. In the process of proc...

Claims

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Application Information

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IPC IPC(8): C01B19/02
Inventor 马玉天黄虎军钟清慎周鹤立乔保民蔡静
Owner JINCHUAN GROUP LIMITED
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