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Process for separating and recovering selenium from selenium-containing material

A technology for recycling selenium and materials, applied in the direction of element selenium/tellurium, can solve the problems of low comprehensive utilization rate, long process flow, complicated process, etc., and achieve the effect of shortening production cycle, shortening process flow, and reducing environmental pollution

Active Publication Date: 2012-06-13
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are more suitable for processing materials with low selenium grades, and have disadvantages such as complex procedures, large pollution, long process flow and low comprehensive utilization rate.

Method used

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  • Process for separating and recovering selenium from selenium-containing material
  • Process for separating and recovering selenium from selenium-containing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A process for separating and reclaiming selenium from selenium-containing materials, the implementation steps are as follows:

[0029] ① Oxidative leaching of selenium: Take 100g of dried selenium-containing material, and the selenium content in the analysis residue is 21.54%; lead 45.52%; tellurium 0.28%; silver 0.2%; Add 200% of the theoretical amount and 10% H by mass percentage 2 o 2 ; The concentration of sulfuric acid is controlled to 3mol / L, the liquid-solid ratio is 4:1, stirring at a constant speed, the reaction temperature is 85°C, and the oxidation time is 3 hours; solid-liquid separation, leaching slag containing 58.83% lead is sent to the pyrometallurgy system with known technology Extract silver, lead and copper; the recovery rate of lead can reach 98.12%; the concentration of selenium in the separated leachate can reach 43.28g / L;

[0030] ②Separation of selenium and tellurium: add sodium hydroxide with a mass percentage concentration of 10% to the leach...

Embodiment 2

[0035] A process for separating and reclaiming selenium from selenium-containing materials, the implementation steps are as follows:

[0036] ① Oxidative leaching of selenium: Take 100g of dried selenium-containing material, and the selenium content in the analysis residue is 18.22%; lead 48.66%; tellurium 0.31%; silver 0.32%; Add 150% of the theoretical amount, 10% H in mass percent concentration 2 o 2 ; Control the concentration of sulfuric acid to 2.5mol / L, liquid-solid ratio 3:1, constant speed stirring, reaction temperature is 65 ℃, oxidation time 1 hour; Technology to extract silver, lead and copper; the recovery rate of lead can reach 97.23%; the concentration of selenium in the separated leachate can reach 40.05g / L;

[0037] ②Separation of selenium and tellurium: add sodium hydroxide with a mass percentage concentration of 10% to the leaching solution separated in step ① to adjust the pH to 5.5, so that tellurium forms a tellurite precipitate, and the sulfur remainin...

Embodiment 3

[0042] A process for separating and reclaiming selenium from selenium-containing materials, the implementation steps are as follows:

[0043] ① Oxidative leaching of selenium: Take 100g of dried selenium-containing material, and the selenium content in the analysis residue is 28.774%; lead 40.13%; tellurium 0.25%; silver 0.14%; Add 180% of the theoretical amount, 10% H by mass percentage 2 o 2 ; The concentration of sulfuric acid is controlled to 3.5mol / L, the liquid-solid ratio is 6:1, the constant speed is stirred, the reaction temperature is 95°C, and the oxidation time is 2 hours; solid-liquid separation, the leaching slag containing 55.64% of lead is sent to the pyrometallurgy system with known Technology to extract silver, lead and copper; the recovery rate of lead can reach 97.85%; the concentration of selenium in the separated leachate can reach 45.92g / L;

[0044] ②Separation of selenium and tellurium: Add sodium hydroxide with a mass percentage concentration of 10% ...

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Abstract

The invention relates to a process for separating and recovering selenium from a selenium-containing material. The process comprises the following steps: dissolving the selenium-containing material into a sulfuric acid solution, adding 10% H2O2 into the mixture, filtering and separating to get leachate and residue containing silver, lead, copper and other valuable metals; separating the selenium from tellurium in the oxidation leachate by using sodium hydroxide; and acidifying the selenium leachate with hydrochloric acid, adding sodium sulfite to reduce the settled selenium, washing and drying to get crude selenium with the grade of not lower than 90%. The crude selenium which is separated by the process is higher in purity and can be directly refined, so that the process flow of recovering selenium is shortened, the recovery rate of selenium is improved, the production cost is reduced and the energy is saved; and the sodium sulfite is used for substituting sulfur dioxide to perform reduction, the control is easy and the environmental pollution is further reduced. The process has very important significance in both aspects of recovering resources and protecting an environment.

Description

technical field [0001] The technology belongs to the field of non-ferrous metal hydrometallurgy and secondary resource recovery, and relates to a process for separating and recovering selenium from selenium-containing materials. technical background [0002] Scattered metal selenium is widely used in metallurgical industry, electronics industry, national defense industry, electrostatic copying, glass, medicine and agriculture. With the continuous expansion of selenium application fields, the demand for selenium in the international market is also increasing year by year. Due to the rarity of selenium, it is not feasible to directly recover it from the ore. The by-products produced in the smelting process of heavy metal sulfide ores are an important source of selenium recovery. Major source of selenium. At present, solvent extraction, ultra-vacuum evaporation, ion exchange, and soda ash roasting are mainly used in China to separate selenium from other impurities. However, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/02
Inventor 柴承平杨跃新蔡练兵曹永德曹永贵
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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