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Method for recycling tin from tin alkali solution

A technology of tin alkali and solution, which is applied in the field of recovering tin from tin alkali solution, can solve the problems of bringing in impurities and low precipitation efficiency, and achieve the effect of low temperature, high purity and high value

Inactive Publication Date: 2016-04-13
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The product obtained by the precipitation method is a tin-containing oxide or compound, which requires reduction and smelting to obtain metallic tin, and the precipitation efficiency is not high, and new impurities may be introduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Taking the tin-containing waste residue of a tin-plating factory as the treatment object, its composition (wt%) is tin Sn: 28.25%, iron Fe: 3.51%, leaching with alkali solution, leaching temperature 30℃, leaching time 2h, alkali concentration 180g / L , The leachate composition (g / L) is tin Sn: 24.53g / L.

[0025] Heat the tin alkali solution to 90°C, add 200 mesh metal zinc powder according to the molar ratio of zinc Zn: tin Sn=3:1, and add a certain amount of copper oxide CuO additive, the dosage of copper oxide CuO is metal zinc powder The dosage is 0.01%, the replacement time is 1h, after the reaction is completed, filter while it is hot, the obtained filtrate components are zinc Zn: 21.08g / L, tin Sn: 0.098g / L, the filtrate is directly electrolyzed to recover zinc powder, zinc powder The recovery rate reaches 93.23%, and the tin content in the obtained filter residue is 85.82%, which is sold or subsequently processed.

Embodiment 2

[0027] Taking the tin-containing waste slag of a tin-plating factory as the processing object, its composition (wt%) is tin Sn: 32.17%, iron Fe: 1.30%, leaching with alkali solution, leaching temperature 50℃, leaching time 2h, alkali concentration 200g / L , The leachate composition (g / L) is tin Sn: 26.88g / L.

[0028] Heat the tin alkali solution to 70°C, add 200 mesh metal zinc powder according to the molar ratio of zinc Zn: tin Sn=2:1, and add a certain amount of antimony trichloride SbCl3 additive, the additive dosage is metal zinc powder The dosage is 0.1%, the replacement time is 1.5h, after the reaction is completed, filter while it is hot, the obtained filtrate components are zinc Zn: 20.25g / L, tin Sn: 0.085g / L, the filtrate is directly electrolyzed to recover zinc powder, zinc powder The recovery rate reached 95.08%, and the tin content in the obtained filter residue was 87.47%, which was sold or subsequently processed.

Embodiment 3

[0030] Taking the tinplate anode slime of a factory as the treatment object, its composition (wt%) is tin Sn: 15.25%, iron Fe: 18.51%, leaching with alkali solution, leaching temperature 70°C, leaching time 3h, alkali concentration 150g / L, leaching solution Composition (g / L) is tin Sn: 12.25g / L.

[0031] Heat the tin alkali solution to 50°C, add 200 mesh metal zinc powder according to the molar ratio of zinc Zn:tin Sn=1.5:1, and add a certain amount of copper oxide CuO, the dosage of copper oxide CuO is metal zinc powder 0.05% of the added amount, the replacement time is 2 hours, after the reaction is completed, filter while it is hot, the obtained filtrate components are zinc Zn: 11.54g / L, tin Sn: 0.073g / L, and the filtrate is directly electrolyzed to recover zinc powder, recovery of zinc powder The rate reaches 90.41%, and the tin content in the obtained filter residue is 89.18%, which is sold or subsequently processed.

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Abstract

The invention relates to a method for recycling tin from a tin alkali solution. The method comprises the following steps: stirring the tin alkali solution at a rotation speed of 300-800r / min; adding an additive and metal zinc powder, and reacting for 0.5-2 hours at a temperature of 15-95 DEG C, wherein the adding amount of the additive is 0.01%-2% the adding amount of the metal zinc powder, the adding amount of the metal zinc powder is 1-4 times the molar weight of tin in the tin alkali solution; after the reaction is ended, stopping stirring, filtering, reducing concentration of tin in filtrate to be lower than 100mg / L, and directly electrolyzing the filtrate to produce metal zinc powder, wherein filter slag is coarse tin with content being greater than or equal to 85%; using the metal zinc powder obtained by electrolyzing to replace tin in the next-batch tin alkali solution, so that the production cost is reduced, and the electrolysis waste liquor is recycled for leaching tin-containing materials to prepare the tin alkali solution, and no waste liquor is exhausted. The method is simple in replacement reaction condition, is not high in temperature, is quick in replacement, and the obtained tin is great in purity, is great in value; and the additive is wide in source, is cheap and easily available, and is less in dosage.

Description

technical field [0001] The invention belongs to the field of solid waste recycling, and relates to a method for recovering metallic tin from tin-containing waste, in particular to a method for recovering tin from a tin-alkali solution. Background technique [0002] Metal tin is widely used in national production and life because of its good properties. The most important use of tin is to plate tin and its alloys on metal surfaces for protection and decoration, and it is widely used in pharmaceuticals, plastics, ceramics, wood preservation, coatings, flame retardants and plastic stabilizers. Due to the wide variety of tin products and scattered uses, it is inevitable to produce various tin-containing wastes, such as tinplate waste, tin-containing waste slag and smoke, electroplating tin anode slime, etc. At present, the treatment methods of tin-containing waste include pyrotechnics and wet methods. The pyrotechnic method is the main method, but the pyrotechnic method has hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B25/06C25C5/02
CPCC22B7/008C22B25/04C22B25/06C25C1/16C25C5/02Y02P10/20
Inventor 蒋家超刘汉湖田源李萌赵由才商晓甫易天晟
Owner CHINA UNIV OF MINING & TECH
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