Method for recovering tellurium and selenium from copper anode slime smelting flue gas

A technology of copper anode slime and flue gas, applied in the direction of element selenium/tellurium, etc., can solve the problems of affecting selenium recovery rate, melt temperature, high oxygen level requirements, low operating efficiency, etc., and achieve the solution of metal cycle enrichment, The treatment process is simple and feasible, and the effect of improving product quality

Pending Publication Date: 2021-11-09
BAIYIN NONFERROUS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tellurium is easy to form Ag2Te and (Au,Ag)Te with gold and silver during the smelting process and enters the slag, which affects the recovery of gold and silver. High, resulting in low operating eff

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Main content of washing liquid: Se 50g / L, Te 1g / L, Cu 0.6g / L, Mg 2g / L;

[0023] Venturi mud main components: Se 20%, Te 5.0%, Pb 15%, Bi 3.5%, Sb 2.0%;

[0024] (1) Alkaline leaching: After the flue gas from the Caldo furnace is absorbed by the Venturi washing system, the Venturi mud and the washing liquid are put into the neutralization and impurity removal reaction tank, and sodium hydroxide (NaOH) is added at 45g / L for neutralization Precipitate and remove impurities, pass steam to keep the temperature at 80°C, then slowly add hydrogen peroxide at 50g / L for leaching reaction for 2 hours, so that copper, zinc, magnesium and other metal ion impurities are precipitated into the slag, and tellurium in the slag is leached into the solution;

[0025] (2) sulfur dioxide complexation leaching: lead to sulfur dioxide (SO 2 ) complex leaching, so that the selenium in the slag enters the solution in the form of sodium selenosulfite, and after reacting for 4 hours, the pH of th...

Embodiment 2

[0030] Main content of washing liquid: Se 50g / L, Te 1g / L, Cu 0.6g / L, Mg 2g / L;

[0031] Venturi mud main components: Se 20%, Te 5.0%, Pb 15%, Bi 3.5%, Sb 2.0%;

[0032] (1) Alkaline leaching: After the flue gas from the Caldo furnace is absorbed by the Venturi washing system, the Venturi mud and the washing liquid are put into the neutralization and impurity removal reaction tank, and sodium hydroxide (NaOH) is added at 60g / L for neutralization Precipitate and remove impurities, pass steam to keep the temperature at 70°C, and then slowly add hydrogen peroxide at 40g / L for leaching reaction for 2 hours, so that copper, zinc, magnesium and other metal ion impurities are precipitated into the slag, and tellurium in the slag is leached into the solution;

[0033] (2) sulfur dioxide complexation leaching: lead to sulfur dioxide (SO 2 ) complex leaching, so that the selenium in the slag enters the solution in the form of sodium selenosulfite, and after reacting for 4 hours, the pH o...

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PUM

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Abstract

The invention discloses a method for recovering tellurium and selenium from copper anode slime smelting flue gas. The method comprises the following steps: alkaline leaching of tellurium, complexing leaching of selenium by sulfur dioxide, step-by-step neutralization and recovery of tellurium, and selenium reduction. According to the method, the product quality of the crude selenium can be effectively improved; meanwhile, selenium and tellurium are comprehensively recovered, so that selenium and tellurium in the Venturi mud enter washing liquor, the content of selenium and tellurium in the Venturi mud is reduced, the circulation amount of metal selenium and tellurium returned to a Kaldo furnace is reduced, the direct recovery rate of selenium is increased, the influence of tellurium on subsequent selenium reduction is reduced, and the problems of metal circulation enrichment, large system pressure, high energy consumption and metal loss are solved; and the treating process is simple and feasible, the cost is low, and stable operation of the selenium recovery system can be realized.

Description

technical field [0001] The invention belongs to the technical field of comprehensive recovery of selenium in copper anode slime, and in particular relates to a method for recovering tellurium selenium from copper anode slime smelting flue gas. Background technique [0002] Copper smelting anode slime adopts the Kaldor furnace smelting process, which has strong adaptability of process raw materials and high production efficiency. There are many types of intermediate materials and a large amount of returned materials in the process. The current Kaldor furnace smelting process is mostly equipped with a Venturi scrubbing system for flue gas purification and selenium recovery. During the flue gas purification process, when the selenium in the circulating washing liquid reaches a certain concentration, it will be neutralized and precipitated to remove impurities, and the filter residue will be Venturi mud and returned to the Caldo furnace. Production of refined selenium dioxide. ...

Claims

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Application Information

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IPC IPC(8): C01B19/02
CPCC01B19/02
Inventor 王栋贾启金张晓星周明祖
Owner BAIYIN NONFERROUS GROUP
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