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Method for extracting tellurium from copper anode sludge

A copper anode slime and leaching technology, which is applied to the improvement of process efficiency, photography process, instruments, etc., can solve the problems of complex process, increased consumption of chemicals, consumption, etc., to simplify the process flow, reduce production costs, and achieve good separation effect. Effect

Inactive Publication Date: 2011-10-19
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are: (1) Sulfation roasting consumes a lot of energy and pollutes the environment; (2) Two-stage leaching of copper and tellurium is complicated, and acid and alkali are used alternately, resulting in increased consumption of chemicals, difficult wastewater treatment, and is not conducive to factory operations management; (3) low recovery rates of selenium and tellurium
Disadvantages are: tellurium undergoes multiple leaching-precipitation-re-leaching processes, the process is complicated, and a large amount of copper powder is consumed

Method used

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  • Method for extracting tellurium from copper anode sludge

Examples

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Effect test

Embodiment 1

[0036] Add sulfur dioxide to the above-mentioned oxygen pressure acid leaching solution to reduce the selenium precipitation, reduce the selenium precipitation under the conditions of a reduction temperature of 80°C, a reduction time of 4h, and a sulfur dioxide consumption of 5Kg / Kg selenium to obtain crude selenium, and the selenium content of the liquid after selenium removal is 0.01g / kg. l. The selenium-precipitated solution is then electrowinning to remove copper to obtain a copper-removed solution with a copper content of 1g / l, and then add hydrochloric acid to the copper-removed solution, at a chloride ion concentration of 30g / l, a reduction temperature of 75°C, and a reduction time of 1h , Sulfur dioxide consumption is 3Kg / Kg tellurium. Under the condition of tellurium, sulfur dioxide is introduced to precipitate tellurium. After the tellurium is precipitated, the tellurium content in the liquid is 0.01g / l, and the crude tellurium grade is 86%.

Embodiment 2

[0038]Add sulfur dioxide to the above-mentioned oxygen pressure acid leaching solution to reduce the selenium precipitation, reduce the selenium precipitation under the conditions of 90°C reduction temperature, 3h reduction time, and sulfur dioxide consumption of 3Kg / Kg selenium to obtain crude selenium, and the selenium content of the liquid after selenium removal is 0.06g / kg. l. The selenium-precipitated liquid is then electrowinning to remove copper to obtain a copper-removed liquid with a copper content of 2g / l, and then add sodium chloride to the copper-removed liquid with a chloride ion concentration of 10g / l and a reduction temperature of 80°C. The time is 3 hours, and the sulfur dioxide consumption is 6Kg / Kg tellurium. Sulfur dioxide is introduced to precipitate tellurium. After the tellurium precipitation, the tellurium content in the liquid is 0.007g / l, and the crude tellurium grade is 84%.

Embodiment 3

[0040] Add sulfur dioxide to the above-mentioned oxygen pressure acid leaching solution to reduce selenium precipitation, reduce selenium precipitation under the conditions of reduction temperature 90°C, reduction time 0.5h, sulfur dioxide consumption 4Kg / Kg selenium to obtain crude selenium, selenium content after selenium removal 0.1g / l. The selenium-precipitated liquid is then electrowinning to remove copper to obtain a copper-removed liquid with a copper content of 1.5g / l, and then potassium chloride is added to the copper-removed liquid, the chloride ion concentration is 50g / l, and the reduction temperature is 80°C. The reduction time is 0.5h, and the sulfur dioxide consumption is 3Kg / Kg tellurium. Sulfur dioxide is introduced to precipitate tellurium. After the tellurium precipitation, the tellurium content in the solution is 0.02g / l, and the crude tellurium grade is 75%.

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Abstract

The invention discloses a method for extracting tellurium from copper anode sludge and relates to the method for recovering the tellurium from copper-containing tellurium material, in particular to the method for extracting the tellurium from the copper anode sludge. The method is characterized in that the process sequentially comprises the following steps: (1) performing oxygenation, pressurization and sulfuric acid leaching on the copper anode sludge for leaching copper, the tellurium and part of selenium; (2) introducing sulfur dioxide gas into leachate, and precipitating and separating the selenium; (3) performing electrodeposition on a solution after removing the selenium by precipitation and separation, and separating the copper; and (4) introducing the sulfur dioxide gas into the solution after removing the copper by electrodeposition and separation for performing reduction reaction so as to get the deposited crude tellurium. In the method, the selenium deposition and tellurium deposition technology by sulfur dioxide step-by-step reduction is adopted, no copper powder is consumed during the process, the effect of separating the selenium, the tellurium and the copper is good, the grades of the crude tellurium and crude selenium are high, the production cost can be greatly reduce, the process flow is simplified, and convenient conditions are provided for preparing follow-up fine tellurium.

Description

technical field [0001] The invention discloses a method for extracting tellurium from copper anode slime, which relates to recovering tellurium from materials containing copper and tellurium, especially a method for extracting tellurium from copper anode slime. Background technique [0002] Tellurium is a rare metal element, mainly symbiotic with pyrite, chalcopyrite, sphalerite, etc., and forms telluride, tellurium sulfur (selenium) compound with gold, silver, platinum group elements and heavy metal elements such as lead, bismuth, and copper And tellurium oxide, etc. Tellurium is mainly enriched and recovered in the smelting process of copper, lead, zinc and precious metals, among which the anode slime produced in the copper and lead smelting process is the most important tellurium-containing enrichment. Since the anode slime usually contains relatively high amounts of copper, selenium, tellurium, gold and silver, etc., the process of recovering tellurium from the anode sli...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B3/44C25C1/12
CPCY02P10/20
Inventor 蒋训雄范艳青汪胜东蒋开喜蒋伟冯林永刘巍王海北黄胜冯亚平张登高
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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