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Method and application for preparing sodium selenite from selenium dioxide containing bismuth and copper

A technology of selenium dioxide and sodium selenite, which is applied in the directions of selenium/tellurium oxysalt, chemical instruments and methods, applications, etc., can solve the problem of high cost, and achieve the effect of improving absorption effect and short process flow

Active Publication Date: 2016-12-14
NORTHWEST RES INST OF MINING & METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the preparation of sodium selenite, relevant researchers have proposed some methods. Most of the processes are prepared by oxidation of metal selenium powder, but this process requires high pressure oxygen pressure, and the cost is relatively high; the application number is 200710028913.4 Chinese invention patent Provided "a production process for sodium selenite", using pure selenium dioxide to prepare sodium selenite; and about using selenium dioxide containing bismuth and copper produced in the process of nonferrous metals to prepare sodium selenite The method has not been reported yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Crude selenium dioxide composition in weight percent as SeO 2 86.8%, Bi3.5%, Cu6.8%.

[0017] Take 500g of crude selenium dioxide, stir and dissolve with pure water, control the liquid-solid mass ratio to 3:1, add sodium hydroxide and sodium chloride with a mass ratio of 20%:80% to remove bismuth by hydrolysis, and the reaction temperature is 25 ° C, 0.5 Filtrate after h to obtain bismuth oxychloride precipitation; decopper the filtrate with sodium sulfide with an excess multiple of 1.05, the reaction temperature is 40 ° C, press filter after 0.5 h, the filter residue is copper sulfide, sold as copper concentrate; the filtrate is sodium selenate Solution, sodium selenite product was obtained after evaporation and crystallization.

[0018] It is 98.2% by weight percentage to contain sodium selenite in detecting sodium selenite product.

Embodiment 2

[0020] The crude selenium dioxide composition is calculated in weight percent: SeO 2 88.6%, Bi2.8%, Cu7.9%.

[0021] Take 500g of crude selenium dioxide, stir and dissolve with pure water, control the liquid-solid mass ratio to 4:1, add sodium acetate and sodium chloride with a mass ratio of 30%:70% to hydrolyze and remove bismuth, and the reaction temperature is 35°C, after 1h Filtration to obtain bismuth oxychloride precipitation; the filtrate is decoppered with hydrogen sulfide with an excess multiple of 1.05, the reaction temperature is 40 ° C, and press-filtered after 0.5h, the filter residue is copper sulfide, which is sold as copper concentrate; the filtrate is sodium selenate solution, The sodium selenite product is obtained after evaporation and crystallization.

[0022] Detect that sodium selenite is 98.4% by weight percentage in the sodium selenite product.

Embodiment 3

[0024] The crude selenium dioxide composition is calculated in weight percent: SeO 2 89.5%, Bi2.3%, Cu4.6%.

[0025] Take 500g of crude selenium dioxide, stir and dissolve with pure water, control the liquid-solid mass ratio to 3:1, add sodium carbonate and sodium chloride with a mass ratio of 60%:40% to hydrolyze and remove bismuth, and the reaction temperature is 60°C. After 2h Filtration to obtain bismuth oxychloride precipitation; the filtrate is decoppered with hydrogen sulfide with an excess multiple of 1.1, the reaction temperature is 70 ° C, and press-filtered after 0.5h, the filter residue is copper sulfide, which is sold as copper concentrate; the filtrate is sodium selenate solution, The sodium selenite product is obtained after evaporation and crystallization.

[0026] Detecting sodium selenite in the sodium selenite product is 97.2% by weight percentage.

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Abstract

The invention discloses a method and application for preparing sodium selenite from selenium dioxide containing bismuth and copper, and belongs to the technical field of recycling and reuse of non-ferrous metal metallurgy byproducts. According to the method, crude selenium dioxide generated from a recycled precious metal system is treated with processes of hydrolysis bismuth removal and vulcanization copper removal, then sodium selenite can be generated, chlorine and sulfur added in the bismuth removal and copper removal process are essential mineral elements in animal bodies and can join in substance metabolism inside the animal bodies, and if sodium selenite is used as a feed additive, the absorption effect of animal feed can be improved; bismuth and copper as impurities in crude sodium selenite can be effectively utilized. The method is short in process procedure, the whole process is a sealed circulation system, the environment is not polluted, and requirements of clean production can be met.

Description

technical field [0001] The invention belongs to the technical field of recycling by-products of nonferrous metal smelting, and in particular relates to a method for preparing sodium selenite from selenium dioxide containing bismuth and copper and the application of the sodium selenite as a feed additive. Background technique [0002] Selenium is an essential trace element in the life activities of animals. It is used to synthesize glutathione peroxidase, which can prevent exudative constitutional diseases and liver necrosis in animals. Selenium deficiency will lead to the occurrence of Keshan disease and Kaschin-Beck disease. In selenium-deficient areas, selenium deficiency in plants will lead to insufficient selenium supply in animals. Although there are many ways to supplement, it is better to supplement with food. Since selenium is an element that is easily excreted, animals must take in sufficient amounts of selenium every day to maintain normal metabolism. Once the sup...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/00A23K20/20
CPCC01B19/008C01P2006/80
Inventor 鲁兴武朱来东王惠莹程亮易超陈一博李俞良李彦龙马爱军陈文波张恩玉杨刚曹桂银
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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