Method for recycling metal bismuth from anode slime
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A technology for anode slime and metal, applied in the field of recovering metal bismuth, can solve the problems of slow progress of the process and difficult leaching, and achieve the effects of simple method, convenient operation, high recovery rate and recovery purity
Active Publication Date: 2016-08-03
ZHEJIANG YADONG IND CO LTD
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[0003] In the prior art, the Chinese invention patent application with the publication number CN103334013A discloses a leaching process for extracting precious metals from silver separation slag, but the similar direct leaching method is difficult to leaching and the progress of the process is slow
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[0015] The present invention will be further described below in combination with specific embodiments.
[0016] A method for recovering metallic bismuth from anode slime, comprising the following steps a to e:
[0017] a. Roasting: acidify the anode slime with sulfuric acid, then roast to obtain roasted slag; the specific steps are: mix the anode slime and concentrated sulfuric acid at a solid-to-liquid mass ratio of 3:1 to 1:1, preferably 1.5:1, and mix Then place it in a muffle furnace for calcination, the calcination temperature is 500-600°C, preferably 550°C.
[0018] Anode slime and 98% concentrated sulfuric acid are mixed in the workshop and then placed in a muffle furnace to steam selenium, which mainly produces the following reactions:
[0019] Cu+2H 2 SO 4 →CuSO 4 +2H 2 O+SO 2
[0020] 2Ag+2H 2 SO 4 →2Ag2SO4+2H 2 O+SO 2
[0021] Se+2H 2 SO 4 → SeO 2 +2H 2 O+2SO 2
[0022] Cu 2 S+6H 2 SO 4 →2CuSO 4 +6H 2 O+5SO 2
[0023] Therefore, the waste ga...
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Abstract
A method for recycling metal bismuth from anode slime includes the following steps that a, sintering is performed; b, copper separation is performed so that a sulfate solution and copper separation slag can be obtained; c, gold separation is performed so that gold separation mother liquor can be obtained, wherein the concentration of sulfuric acid is 100 g / L to 120 g / L, the concentration of hydrochloric acid is 10 g / L to 15 g / L, the concentration of chloride ions is 25 g / L to 35 g / L, temperature is raised to 75 DEG C to 85 DEG C, excessive sodium chlorate is added, after a reaction, gold metal, platinum metal, palladium metal, tellurium metal and bismuth metal are dissolved in the gold separation mother liquor, then sodium sulfite is added in the gold separation mother liquor to separate gold so that gold separation liquid can be obtained; d, sodium chloride and sodium sulfite are added in the gold separation liquid obtained in the step c, the concentration of sodium chloride is controlled to be 250 g / L to 300 g / L, liquid temperature is controlled to be 75 DEG C to 85 DEG C, precious metal, tellurium and selenium in the liquid are reduced into suspended matter, and after filtration, bismuth separation liquid is obtained; and e, sodium hydroxide is added into the bismuth separation liquid obtained in the step d, PH is adjusted to be 10 to 11, bismuth in the liquid is hydrolyzed, bismuth slag is obtained after filtration, and metal bismuth is obtained after reduction. The method has the following beneficial effects that the method is simple, operation is convenient, and the bismuth recycling rate and the bismuth recycling purity are high.
Description
technical field [0001] The invention relates to metal smelting recovery technology, in particular to a method for recovering metal bismuth from anode slime. Background technique [0002] Anode slime is the residue accumulated from the deposits of the anode and cathode and the electrolyte flowing through the ditch after the electrolysis plant has been in operation for a long time. Anode slime is rich in precious metals, rare metals and other valuable metals. These metals occupy a very important position in the national economy. Extracting these metals from anode slime can obtain great economic benefits. For example, the benefits obtained from the treatment of copper anode slime are sufficient to cover the entire cost of copper electrolytic refining. Therefore, in order to reduce the cost of anode slime treatment, improve the treatment method, and increase the recovery rate of rare and precious metals, all countries are studying new methods for processing anode slime. craft. ...
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