Method for extracting selenium and tellurium from pyrometallurgy smelting soot
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A technology of pyromelting and soot, applied in the direction of elements such as selenium/tellurium, which can solve the problems of harsh working environment, low direct recovery rate, and easy flying and diffusion
Inactive Publication Date: 2015-04-08
JINCHUAN GROUP LIMITED
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However, due to the extremely fine particle size of the soot, it is easy to fly and spread during the pyromelting process, and a part of the soot escapes into the environment, resulting in a poor working environment on site; part of the soot is absorbed again by the dust collection system, so it is treated by the method of pyroprocessing. Soot has the disadvantage of low direct yield of selenium, tellurium and other elements
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Embodiment 1
[0016] Put 300kg of soot into the pulping tank, add water for pulping and dissolving, the liquid-solid ratio of water and soot is 4:1, raise the temperature to 75°C for stirring and pulping, react for 1 hour and then filter, the filtrate is selenous acid solution for reduction Extract crude selenium, add 3mol / L sodium hydroxide solution to the filter residue to leach selenium and tellurium, the liquid-solid ratio of sodium hydroxide solution to water-insoluble residue is 6:1, heat up to 80°C and stir, react for 2 hours, filter again, and the filtrate Add 10% dilute sulfuric acid, adjust the pH value to 5, stir, react for 1 hour to separate selenium and tellurium, filter, and reduce the filtrate to extract crude selenium. By calculation, the direct recovery rate of selenium is 95.08%, the direct recovery rate of tellurium is 81.2%, the selenium content of crude selenium after reduction is 95.12%, and the tellurium content of tellurium-rich slag is 52.48%.
Embodiment 2
[0018] Put 300kg of soot into the pulping tank, add water for pulping and dissolving, the liquid-solid ratio of water and soot is 5:1, heat up to 75°C for stirring and pulping, react for 0.5h and then filter, the filtrate is selenous acid solution, carry out Reductively extract crude selenium, add 4mol / L sodium hydroxide solution to the filter residue to leach selenium and tellurium, the liquid-solid ratio of sodium hydroxide solution to water-insoluble residue is 8:1, heat up to 80°C for stirring, react for 2 hours, filter again, and the filtrate Add 15% dilute sulfuric acid to the solution, adjust the pH value to 5.5, stir, react for 1 hour to separate selenium and tellurium, filter, and reduce the filtrate to extract crude selenium. By calculation, the direct recovery rate of selenium is 95.23%, the direct recovery rate of tellurium is 81.45%, the selenium content of crude selenium after reduction is 95.35%, and the tellurium-rich slag contains 53.25% tellurium.
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Abstract
The invention relates to a method for extracting selenium and tellurium from pyrometallurgy smelting soot, and relates to a method for extracting selenium and tellurium from pyrometallurgy smelting soot collected by a dust collection system in the pyrometallurgy treatment process of copper anode slime. The method is characterized by comprising the following steps: (1) adding water to the pyrometallurgy smelting soot for slurrying and dissolution, filtering to obtain a seleninic acid solution, and extracting crude selenium through direct reduction; (2) adding a sodium hydroxide solution to filter residues to leach selenium and tellurium, and filtering again; (3) adding sulfuric acid to a filtrate, regulating the pH value to obtain a selenium-containing filtrate to extract crude selenium through reduction, and extracting tellurium by using tellurium-rich filter residues as a raw material. According to the method provided by the invention, the direct recovery rates of extracting selenium and tellurium from the soot are 95% and 80% respectively, and the crude selenium contains more than 93% selenium, and the tellurium-rich residues contain more than 50% of tellurium after reduction. In addition, the soot from which selenium and tellurium are recovered is fully enriched in precious metal elements, the grade reaches about 15%, and the soot can be mixed with the copper anode slime to be dried and then treated by pyrometallurgy.
Description
technical field [0001] The invention discloses a method for extracting selenium and tellurium from pyrometallurgy soot, relating to a method for extracting selenium and tellurium in soot collected by a dust collection system in the process of pyroprocessing copper anode slime. Background technique [0002] The soot collected by dry dust collection in the process of pyroprocessing copper anode slime is rich in valuable metal elements such as silver, selenium, tellurium, etc., so it is usually added to the furnace as a return material to recover the valuable metals. However, due to the extremely fine particle size of the soot, it is easy to fly and spread during the pyromelting process, and a part of the soot escapes into the environment, resulting in a poor working environment on site; part of the soot is absorbed again by the dust collection system, so it is treated by the method of pyroprocessing. Soot has the disadvantage of low direct yield of selenium, tellurium and othe...
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