Technology for extracting selenium from low-grade selenium-containing material

A low-grade, material technology, applied in the field of metallurgical technology, can solve the problems of large environmental pollution and low recovery rate, and achieve the effects of no environmental pollution, high recovery rate and wide source.

Active Publication Date: 2012-02-29
郴州雄风环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a process for extracting selenium from low-grade selenium-containing materials in view of the characteristics of low-grade selenium-containing materials, while solving the problems of large environmental pollution and low recovery rate in traditional processes

Method used

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  • Technology for extracting selenium from low-grade selenium-containing material
  • Technology for extracting selenium from low-grade selenium-containing material

Examples

Experimental program
Comparison scheme
Effect test

experiment approach 1

[0027] (1) Take 500g of selenium-containing raw material, which contains 4.32% selenium, and grind it to 100 mesh;

[0028] (2) Add 1500g of water, 150g of sulfuric acid, and 25g of hydrogen peroxide to the selenium-containing material, heat at 90°C, stir the acid-oxygen leaching solution for 3 hours, and filter to obtain 305g of leaching residue (including 0.30% selenium), and 1520mL of acid-oxygen leaching solution ; The leaching slag is sent to pyrometallurgy to recover lead, bismuth and copper;

[0029] (3) Add 43g of anhydrous sodium sulfite to the acid oxygen leaching solution produced in the previous step, heat at 90°C, stir for 1.5 hours and then filter to obtain 22g of coarse selenium powder; return the deselenized water to acid oxygen leaching;

[0030] (4) Add 100g of water and 30g of sulfuric acid to the selenium-containing material, heat at 90°C, stir for 3 hours, and filter to obtain 1.0 g of filter residue (including 13.5% selenium), and 110mL of secondary leach...

experiment approach 2

[0033] (1) Take 10kg of selenium-containing raw material, which contains 3.92% selenium, and grind it to 100 mesh;

[0034] (2) Add 30kg of water, 3kg of sulfuric acid, and 500g of hydrogen peroxide to the selenium-containing material, heat at 90°C, stir the acid-oxygen leaching solution for 3 hours, and filter to obtain 5.83kg of filter residue (including 0.28% selenium), and 30.98% of the acid-oxygen leaching solution L; the leaching slag is sent to pyrometallurgy to recover lead, bismuth and copper;

[0035] (3) Add 785g of anhydrous sodium sulfite to the acid oxygen leaching solution produced in the previous step, heat at 90°C, stir for 1.5 hours and filter to obtain 395.8g of coarse selenium powder; return the deselenized water to acid oxygen leaching;

[0036] (4) Add 2400g of water and 533.25g of sulfuric acid to the selenium-containing material, heat at 90°C, stir for 3 hours, and filter to obtain 18.0 g of filter residue (including 11.6% selenium), and 2483mL of secon...

experiment approach 3

[0039] (1) Take 500g of selenium-containing raw material, which contains 3% selenium, and grind it to 120 mesh;

[0040] (2) Add 1500g of water, 150g of sulfuric acid, and 25g of hydrogen peroxide to the selenium-containing material, heat at 90°C, stir the acid-oxygen leaching solution for 3 hours, and filter to obtain 325g of leaching residue (including 0.25% selenium), and 1538mL of acid-oxygen leaching solution ; The leaching slag is sent to pyrometallurgy to recover lead, bismuth and copper;

[0041] (3) Add 30g of anhydrous sodium sulfite to the acid oxygen leaching solution produced in the previous step, heat at 90°C, stir for 1.5 hours and filter to obtain 14.8g of coarse selenium powder; return the deselenized water to acid oxygen leaching;

[0042] (4) Add 100g of water and 20g of sulfuric acid to the selenium-containing material, heat at 90°C, stir for 3 hours, and filter to obtain 0.89 g of filter residue (including 12.5% ​​selenium), and 110mL of secondary leaching...

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Abstract

The invention discloses a technology for extracting selenium from a low-grade selenium-containing material, and belongs to the technical field of metallurgy. According to the scheme, the technology comprises the following steps of: performing acid-oxygen leaching on the ground low-grade selenium-containing material with heating by using sulfuric acid and oxidant, wherein the selenium enters the acid-oxygen leachate in a form of selenium sulfate; filtering the acid-oxygen leachate, adding anhydrous sodium sulfite into the acid-oxygen leachate, performing primary reduction, filtering after the reduction, and returning the selenium removed water to the acid-oxygen leaching; purifying the obtained elemental crude selenium powder containing certain impurities; performing selective leaching on the crude selenium powder by using 15 percent sulfuric acid solution; filtering, and quantitatively reducing the secondary leachate by using the anhydrous sodium sulfite to obtain sponge selenium; repeatedly cleaning the sponge selenium by using hot water, drying, and thus obtaining high-purity sponge selenium powder. The technology is not limited by the grade of a raw material, is suitable for treating various selenium-containing materials containing 3 to 10 percent of selenium, and is high in selenium recovery rate (reaching over 93 percent) and low in production cost; and the whole production process does not produce waste gas, most waste water can be recycled, and only a little waste water reaching the standard is discharged after being treated, so the technology has no pollution to the environment.

Description

Technical field [0001] The present invention involves the field of metallurgical technology, especially a process to extract selenium from low -quality selenium -containing materials. Background technique [0002] Separation from selenium-containing materials is usually used to use alkaline-soaked-neutralization. For example, in June 8, 2011, in the China Invention Patent Application Number CN 102086029 A, the "one of the" one proposed by Jinchuan Group Co., Ltd.The process method of separating selenium from selenium -containing materials "is to dissolve selenium sink into alkaline sodium sulfate solution. The single selenium and sodium sulfate solution react to generate sodium sodium sulfate that is easily dissolved in water. Sodium selenium sulfate is inUnder the acidification of sulfuric acid, the selenium single sediment is fully reflected. After washing and drying, the purity of about 90%of the thick selenium can be obtained.The invention realizes the separation of copper an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/02
Inventor 张二军谭雄玉曹孝义戴艳平
Owner 郴州雄风环保科技有限公司
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