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A method for recovering refined tin for tin plating from electro-tin plating mud

A technology of electro-tinning and tinning, which is applied in the field of tin recycling, can solve problems such as environmental pollution and impact on the environment, and achieve the effect of solving difficult to handle, easy to obtain sources, and reducing impact

Active Publication Date: 2015-10-21
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The filtered tin sludge belongs to the solid waste gas of the metallurgical industry. Improper treatment can easily affect the environment and cause environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The pretreatment process of tin slime includes acid leaching and oxidation roasting. Take 500g of tin sludge from the electroplating tin factory, add 50g of hydrochloric acid with a concentration of 22%, and use water bath heating to keep the temperature at 90°C for 60min. Suction filtration obtains 300 g of filter residue, and the calculated tin sludge moisture content is 40%. The filter residue was calcined at 600°C for 2 hours, crushed to a particle size of about 1mm for use, and the tin content was 62.4% according to the fluorescence spectrum test.

[0033] Take 200g of pretreated tin sludge in a crucible, weigh 20g of reduced coal that has been crushed to a particle size of 40 mesh, stir and mix thoroughly, and place it in a protective atmosphere heating furnace. Before heating, replace the oxygen in the furnace with industrial nitrogen, turn on the reduction temperature at 900°C, and keep it warm for 40 minutes. After the heating stops, continue to protect the at...

Embodiment 2

[0035] The pretreatment process of tin slime includes acid leaching and oxidation roasting. Take 1000g of tin sludge from the electroplating tin factory, add 100g of hydrochloric acid with a concentration of 22%, and use water bath heating to keep the temperature at 90°C for 60min. Suction filtration obtained 620 g of filter residue, and the calculated tin sludge moisture content was 38%. The filter residue was calcined at 600°C for 2 hours, crushed to a particle size of about 1mm for use, and the tin content was 58.9% according to the fluorescence spectrum test.

[0036] Take 500g of pretreated tin sludge in a crucible, weigh 55g of reduced coal that has been crushed to a particle size of 40 mesh, stir and mix thoroughly, and place it in a protective atmosphere heating furnace. Before heating, replace the oxygen in the furnace with industrial nitrogen, turn on the reduction temperature at 900°C, and keep it for 40 minutes. After the heating stops, continue to protect the atm...

Embodiment 3

[0038]The pretreatment process of tin slime includes acid leaching and oxidation roasting. Take 2000g of tin sludge from the electroplating tin factory, add 200g of hydrochloric acid with a concentration of 22%, and use water bath heating to keep the temperature at 90°C for 60min. Suction filtration obtained 1160 g of filter residue, and the calculated tin sludge moisture content was 42%. The filter residue was calcined at 600°C for 2 hours, crushed to a particle size of about 1 mm for use, and the tin content was 61.8% according to the fluorescence spectrum test.

[0039] Take 1000g of pretreated tin sludge in a crucible, weigh 115g of reduced coal that has been crushed to a particle size of 40 mesh, stir and mix thoroughly, and place it in a protective atmosphere heating furnace. Before heating, replace the oxygen in the furnace with industrial nitrogen, turn on the reduction temperature at 900°C, and keep it warm for 60 minutes. After the heating stops, continue to protect...

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PUM

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Abstract

The invention discloses a method for recovering refined stannum for tinning from electroplate tin mud, and the method belongs to the technical field of tin recovery methods and is used to recover refined stannum for tinning from electroplate tin mud. The technical scheme employs the following recovery process: performing dewatering drying on electroplate tin mud subjected to acid leaching; performing oxidation roasting, and mixing with proper amount of a reducer for preparing a material; performing protective-atmosphere reduction at a relatively low reducing temperature for relatively short reducing time; and performing electrorefining and remelting on obtained crude tin to obtain refined tin for tinning. The method removes Bi, As, Sb and other harmful elements through acid leaching and roasting manners; the reducer is cheap in price and easily available; the reducing conditions are easily controlled, and the reducing time is substantially shortened compared with that of conventional reduction smelting; and the obtained refined tin is extremely less in impurities and completely accords with electroplating requirement. The recovering method helps to obtain refined tin for electrotinning and alleviate the problem that a large amount of tin is loss during electroplating, also solves the problems that tin mud is difficult is process and easily causes environment pollution, and has economic benefit and environmental benefit.

Description

technical field [0001] The invention relates to a method for recovering refined tin for tin plating from electroplating tin mud, and belongs to the technical field of tin recovery methods. Background technique [0002] At present, the most widely used electrolytic tin plating method is Fronstein tin plating (PSA). The early PSA tin plating solution uses a soluble tin anode for electrolysis, but it is prone to the problem of excess plating solution being drained out. In order to fundamentally solve this problem, insoluble anodes are mostly used in the tin plating process, and tin ions are added to the solution from the outside during the electroplating process. At present, the process of dissolving tin mostly adopts the method of dissolving tin through oxygen. The process of dissolving tin is usually completed in the tin dissolving tank. There is a tin particle container above the tin dissolving tank. Open the tin particle input valve and put a certain amount of tin particles...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B25/06C22B25/02C25C1/14
CPCY02W30/54Y02P10/20
Inventor 田京雷许磊黄世平李立业刘宏强李建新
Owner HEBEI IRON AND STEEL