Method for preprocessing anode sludge and recovering dissipated metal
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A technology of scattered metals and anode slime, applied in non-metallic elements, chemical instruments and methods, and improvement of process efficiency. The effect of silver recovery rate and simple process
Inactive Publication Date: 2009-01-07
CENT SOUTH UNIV
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The traditional pyrolysis process has strong adaptability to raw materials and large processing capacity, but its electrolysis process is complicated and lengthy, the direct recovery rate of gold and silver is not high, there is a lot of slag returning, and the production cycle is long, which affects the synthesis of copper, lead, antimony, bismuth and other metals. Low utilization rate and serious environmental pollution; the combination process of dressing and smelting has the characteristics of strong adaptability of raw materials, low construction investment, low operatin
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Embodiment 1
[0014] Take 3kg of copper anode slime, the composition of which is shown in Table 1:
[0015] Table 1 Composition / % of copper anode slime
[0016]
[0017] When the amount of sulfuric acid is 1.5% of the amount of copper in the anode slime, the reaction temperature is 80°C, the reaction time is 1.5h, and the reaction liquid-solid ratio is 3:1, the copper leaching rate reaches 99%, and the selenium leaching rate is 10.4%. Tellurium leaching rate was 22.4%.
[0018] The sulfuric acid leaching solution is evaporated, cooled, and crystallized to recover copper sulfate. The contents of Se and Te in the mother liquor respectively reach 6.105g L -1 , 10g·L -1 . Sodium sulfite was added to the mother liquor according to 2.6 times of the amount of selenium substance, reacted at room temperature for 0.5h, filtered and dried to obtain 9.1g of crude selenium with a mass percentage of 85%. After reducing selenium, add sodium sulfite three times the amount of tellurium, and add appro...
Embodiment 2
[0027] Take 3kg of copper anode slime, the composition of which is shown in Table 1. The anode slime is leached under the conditions that the amount of sulfuric acid is 1.5% of the amount of copper in the anode slime, the reaction temperature is 80°C, the reaction time is 1.5h, and the reaction liquid-solid ratio is 3:1.
[0028] After sulfuric acid leaching to remove copper, sodium carbonate conversion to remove lead. The conditions for sodium carbonate conversion and deleading are: the ball milling time is 3 hours, the amount of sodium carbonate is 2.5 times the theoretical amount, the ball milling liquid-solid ratio is 2:1, and the ball-to-material ratio is 8:1. Sodium carbonate conversion deleading slag is leached with nitric acid, the liquid-solid ratio is 2:1, the leaching temperature is 23°C, the leaching time is 1.5h, and the amount of nitric acid is 6.0 times the amount of lead substance. The lead leaching rate reached 68.2%, and the composition of the deleaded anode...
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Abstract
The invention relates to a method for pre-processing anode mud and recycling rare metals. The invention carries out pre-processing on the anode mud of copper and lead ions and recycling the rare metals; firstly the anode mud is extracted by an acid liquid; a primary acid extraction liquid and the primary decopper anode mud are obtained by filtering; the primary decopper anode mud after being stirred and grinded with sodium carbonate is extracted by metric acid or acetic acid to obtain the deleading anode mud; after sulfated roasting for steaming selenium is carried out on the primary decopper anode mud or the deleading anode mud, the steaming selenium anode mud is extracted by the acid liquid; a secondary acid extraction liquid and the secondary decopper anode mud are obtained by filtering. The acid extraction liquid recycles the selenium and Te by reducing or recycles the slag of selenium and Te by directly adding alkali to react in the acid extraction liquid. The secondary acid extraction liquid after recycling the Te by reducing uses alkali or adds water to dilute and adjust the pH value of a filter liquid and obtain the slag of bismuth by filtering. The method of the invention has a simple flow, a high recycling rate of selenium, Te and bismuth; the noble metals can be enriched and the recycling rate of gold and silver can be remarkably improved.
Description
technical field [0001] The invention belongs to the field of hydrometallurgy, in particular to a method for pretreating copper-lead anode slime and recovering scattered metals. Background technique [0002] Anode slime is composed of various substances that are insoluble in the electrolyte produced during the electrolytic refining process of copper and lead anodes. Its composition and yield are mainly related to the composition of the anode, the quality of the ingot and the technical conditions of electrolysis. During electrolysis, the base metal with negative potential dissolves into the solution, and the noble metal, scattered metal (such as selenium, tellurium, bismuth), anode powder, etc. form insoluble matter and become anode slime. [0003] The yield of anode slime is generally 0.2-1%, and its main components are Cu: 10-35%, Ag: 1-28%, Au: 0.1-1.5%, Se: 2-23%, Te: 0.5-8%, S: 2 to 10%, Pb: 1 to 25%, Ni: 0.1 to 15%, Sb: 0.1 to 10%, As: 0.1 to 5%, Bi: 0.1 to 1%, trace am...
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