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Treatment method of tin anode slurry

A technology of tin anode slime and treatment method, which is applied in the direction of improving the process efficiency, can solve the problems of high operation intensity, long process time, long process flow, etc., so as to reduce the production cost, strengthen the removal effect, and simplify the treatment process. Effect

Inactive Publication Date: 2013-08-21
CENT SOUTH UNIV
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Problems solved by technology

But there are also many disadvantages: (1) Due to the high temperature of reduction smelting, the process takes a long time, resulting in high energy consumption; (2) A large amount of flue gas and slag will be generated during the reverberatory furnace smelting process, and the emission of flue gas will easily lead to Smoke pollution, some metals enter the slag, resulting in low smelting recovery rate; (3) The secondary anode slime generated during the treatment process needs to be recycled in the subsequent acid leaching process, resulting in lengthy process flow, high acid consumption, and large acid mist. The operation intensity is high, and the comprehensive recycling benefit is poor

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Embodiment 1

[0045] A compound compound containing lead and antimony (molecular formula: Pb 2 Sb 2 o 7 ) tin anode slime as raw material (the stacking days are 300 days), the chemical composition analysis results show that the slime mainly contains Sn31.27wt%, Pb13.63wt%, Sb19.85wt%, Ag0.098wt%. First, take 8g of the anode slime and mix it evenly with 4% charcoal powder, put it into a material boat and place it in a vacuum reaction furnace for vacuum carbothermal reduction reaction. The reduction temperature is 850° C., the reduction time is 60 minutes, the vacuum degree of the system is about 100 Pa, and the air flow rate is about 400 ml / min. After the reaction was completed, 3.77 g of distillate was collected from the boat, and the evaporation rate was 52.9%. According to chemical composition analysis, the residue mainly contains Sn63.71wt%, Pb0.12wt%, Sb3.00wt%, Ag0.203wt%. Calculated according to the residue, the removal rate of lead and antimony in the vacuum carbothermal reductio...

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Abstract

The invention relates to a treatment method of tin anode slurry, which belongs to the technical field of vacuum metallurgy of non-ferrous metals. The treatment method of the tin anode slurry comprises the following steps of: reducing and decomposing lead-antimony composite compound carbon in the tin anode slurry into lead oxide and antimony oxide by using naturally stacked oxidized tin anode slurry as the material through two-step vacuum melting, quickly evaporating to remove the lead oxide and the antimony oxide to obtain residuum; and reducing the residuum, so that tin dioxide in the residuum is reduced to obtain crude tin. According to the treatment method of the tin anode slurry, the lead removing rate of the tin anode slurry is not lower than 99%, the antimony removing rate is not lower than 92%, the direct tin yield is not lower than 94% and the tin content in the crude tin is not less than 94wt%. The treatment method of the tin anode slurry disclosed by the invention can be used for simultaneously removing the lead and the antimony by one step, simplifying the treatment process of the tin anode slurry and lowering the production cost. Compared with the existing tin anode slurry treatment process, the treatment method of the tin anode slurry disclosed by the invention has the advantages of being simple in process, low in energy consumption, small in smoke gas pollution and the like.

Description

technical field [0001] The invention relates to a treatment method for tin anode slime, which belongs to the technical field of nonferrous metal pyrometallurgy. Background technique [0002] Tin anode slime is a by-product of the tin electrolytic refining process, which mainly contains metal elements such as Sn, Pb, Sb, Ag, Bi and Cu, and is an important raw material for tin recycling. Lead and antimony in tin anode slime exist in the form of lead-antimony complex compounds, and antimony exists in tin anode slime in the form of pentavalent. In order to effectively enrich and recover tin, other valuable elements such as Pb and Sb should be separated and recovered first. [0003] At present, the domestic treatment of tin anode slime mainly adopts the process of reduction smelting-fluosilicate electrolysis, that is, the anode slime is mixed with fluxes such as sodium carbonate and fluorite and reduced coal powder, and sent to the reverberatory furnace for reduction smelting. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B25/06
CPCY02P10/20
Inventor 丘克强李伟
Owner CENT SOUTH UNIV
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