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Method for prolonging expiration date of stannous sulfate product

A stannous sulfate and shelf life technology, applied in chemical instruments and methods, tin compounds, inorganic chemistry, etc., can solve the problems of increased product turbidity, product crystal oxidation, short product shelf life, etc., to achieve the effect of improving shelf life

Active Publication Date: 2015-05-06
广西华锡集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the method of producing stannous sulfate mainly is: under sulfuric acid solvent, electrolyze tin plate, or use tin powder and sulfuric acid direct reaction to obtain stannous sulfate solution and obtain stannous sulfate product through concentration, but exist in existing technology The problem is: when the stannous sulfate product crystal is stored in the air, the divalent tin in it is easily oxidized to tetravalent tin, resulting in increased turbidity of the product and shortened shelf life of the product
But the weak point of this invention is that the product crystal obtained has suffered air oxidation during drying and storage
However, the method has a high purity of stannous sulfate, but still fails to protect the oxidation situation of divalent tin well in the process, and the shelf life of the product is shorter

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for prolonging the shelf life of stannous sulfate products, comprising the following steps:

[0021] (1) Washing: After concentrated crystallization and solid-liquid separation of the stannous sulfate solution, the stannous sulfate crystals were washed with ethanol solution for 5 minutes, then centrifuged and dried at 60°C; the mass content of the ethanol solution was 60%;

[0022] (2) Coating: After the drying stops, when the temperature of the stannous sulfate crystal is ≤40°C, evenly spray the stannous sulfate crystal with a hydroquinone solution with a mass content of 0.1%, and spray 80g of terephthalate on 1t of the stannous sulfate crystal. Phenol, stirred for 10 minutes; then evenly sprayed with 0.3% β-naphthol solution, 1t of stannous sulfate crystal sprayed with 80g β-naphthol, stirred for 5 minutes; finally evenly sprayed with 0.05% benzotriazole solution , Spray 40g of benzotriazole on 1t of stannous sulfate crystals, and stir thoroughly for 20min. ...

Embodiment 2

[0024] A method for prolonging the shelf life of stannous sulfate products, comprising the following steps:

[0025] (1) Washing: After concentrated crystallization and solid-liquid separation of the stannous sulfate solution, the stannous sulfate crystals were washed with ethanol solution for 10 minutes, then centrifuged and dried at 60°C; the mass content of the ethanol solution was 80%;

[0026] (2) Coating: After the drying stops, when the temperature of the stannous sulfate crystal is ≤40°C, evenly spray the stannous sulfate crystal with a hydroquinone solution with a mass content of 0.2%, and spray 90g of terephthalate on 1t of the stannous sulfate crystal Phenol, stirred for 10 minutes; then evenly sprayed with 0.1% β-naphthol solution, 1t of stannous sulfate crystals were sprayed with 90g β-naphthol, stirred for 8 minutes; finally evenly sprayed with 0.08% benzotriazole solution , Spray 45g of benzotriazole on 1t of stannous sulfate crystals, and stir thoroughly for 20...

Embodiment 3

[0028] A method for prolonging the shelf life of stannous sulfate products, comprising the following steps:

[0029] (1) Washing: After concentrated crystallization and solid-liquid separation of the stannous sulfate solution, the stannous sulfate crystals were washed with ethanol solution for 10 minutes, then centrifuged and dried at 70°C; the mass content of the ethanol solution was 60%;

[0030] (2) Coating: After the drying stops, when the temperature of the stannous sulfate crystal is ≤40°C, evenly spray the hydroquinone solution with a mass content of 0.3% on the stannous sulfate crystal, and spray 100g of terephthalate on 1t of the stannous sulfate crystal phenol, stirred for 20 minutes; then evenly sprayed with 0.2% β-naphthol solution, 1t of stannous sulfate crystals were sprayed with 100g β-naphthol, stirred for 7 minutes; finally evenly sprayed with 0.1% benzotriazole solution , Spray 50g of benzotriazole on 1t of stannous sulfate crystals and stir thoroughly for 10...

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Abstract

The invention discloses a method for prolonging the expiration date of a stannous sulfate product. The method comprises the following steps: (1) washing: carrying out concentration and crystallization and solid-liquid separation on a stannous sulfate solution, washing stannous sulfate crystal with an ethanol solution for 5-10 minutes, carrying out centrifugal separation and then drying; and (2) coating: after drying, uniformly spraying the stannous sulfate crystal with a 0.1%-0.3% hydroquinone solution and stirring for 10-20 minutes, then uniformly spraying a 0.1%-0.3% beta-naphthol solution and stirring for 5-8 minutes, finally, uniformly spraying a 0.05%-0.1% benzotriazole solution and adequately stirring for 10-20 minutes. By using the method disclosed by the invention, the quality of the product is not affected, the expiration date of the product is improved, the expiration date of the product is extended from the initial and optimal 5 months to 8-10 months.

Description

technical field [0001] The invention belongs to the field of stannous sulfate preparation, and in particular relates to a method for prolonging the shelf life of stannous sulfate products. Background technique [0002] Stannous sulfate is white or light yellow crystalline powder. Soluble in water and dilute sulfuric acid, the aqueous solution decomposes rapidly, and begins to decompose into basic salt above 360°C, which will slowly oxidize in the air and become slightly yellow. It is mainly used for tin plating in electroplating industry, oxidation coloring of aluminum alloy surface, mordant in printing and dyeing industry, hydrogen peroxide remover, etc. At the same time, it is used for tinning or chemical reagents, such as acid plating of alloys, tinplate, cylinder pistons, steel wires, etc., bright tinning of electronic devices, etc. In addition, it is also used for oxidative coloring of the coating of aluminum alloy products, as a mordant in the printing and dyeing ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/00
Inventor 张诚赵鹏叶有明农永萍凌宏光阳吉华雷彬和
Owner 广西华锡集团股份有限公司
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