Treatment method of high-palladium high-tin high-copper regenerated tin anode slime

Abstract

The invention relates to a treatment method of high-palladium high-tin high-copper regenerated tin anode slime. The method comprises the following steps of (1) pre-leaching; (2) pressurized oxidationleaching; (3) precipitating silver; (4) separating gold; (5) separating silver; and (6) smelting in a tin-lead antimony-fire method. According to the treatment method, the copper and nickel in the high-palladium high-tin high-copper tin anode slime are effectively and selectively leached into the copper removal liquid, so that a cathode copper and nickel sulfate product can be obtained, the loss of silver in the pressurized oxidation leaching working sequence is effectively reduced through the silver precipitation operation, gold, silver and platinum and palladium are separated can be realizedthrough 'gold separation-silver separation' process, and tin and lead-antimony alloy products can be obtained by smelting through the tin-lead antimony-fire method. According to the treatment method,automatic control is easy to realize, effective separation and recovery of copper-nickel, tin-lead and antimony and noble metals can be realized, the whole process can realize closed-loop circulationof the smelting system, without emission of three wastes, and has the characteristics of good environmental effect, good economical efficiency and the like.

Description

technical field [0001] The invention relates to the technical field of nonferrous metallurgy, in particular to a method for treating regenerated tin anode slime with high palladium, high tin and high copper. Background technique [0002] When crude tin is electrolytically refined, tin is reduced and precipitated at the cathode to become a product, and elements with a positive potential than tin remain at the anode and sink to the bottom of the electrolytic cell to become anode slime, which mainly contains Cu, Ni, Pb, Sn, Sb, Au, Ag , Pd and other metal elements. [0003] The existing tin anode slime treatment methods mainly include: [0004] One: reduction smelting - electrolysis process. The principle of this method is that the tin anode slime is mixed with sodium carbonate and reducing agent coal powder, etc., and sent to the reverberatory furnace or electric furnace for reduction smelting. The smelting temperature is 1200~1300°C, and the smelting time is 12h, and finall...

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Problems solved by technology

Similarly, this method also has many shortcomings: the process operation is intensive, the comprehensive recovery rate is not high, there is no comprehensive treatment process for precious metals such as Au, Ag, Pd, and the economic benefit is not high

However, this method consumes a lot of energy, and the smoke generated during the roasting process will bring out some volatile metals such as lead, tin, and antimony, which will reduce the metal recovery rate, and a separate arsenic removal and desulfurization process must be set up.

[0006] Specific processes such as: CN201610277602.0 discloses a method for the comprehensive recovery of valuable metals from tin anode slime by oxygen pressure treatment, which uses hydrometallurgy such as oxygen pressure alkaline leaching tin, sulfuric acid oxidation leaching copper, chlorination leaching antimony and bismuth, etc. method, can realize the separation and recovery of valuable metals such as tin, arsenic, antimony, copper, bismuth in tin anode slime, but this method uses sodium chloride and potassium chlorate to leach antimony and bismuth in the "chlorination leaching" step, which will cause The recovery rate of precious metal gold is reduced, and there are problems such as long process flow, high investment cost, and low recovery rate of precious metals.

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