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Method for extending warranty period of stannous sulfate

A technology of stannous sulfate and shelf life, applied in chemical instruments and methods, tin compounds, inorganic chemistry, etc., can solve the problems of increased product turbidity, shortened product shelf life, easy oxidation, etc., to improve shelf life and avoid oxidation resistance Reduced effect

Active Publication Date: 2019-01-01
GUANGXI NORMAL UNIV OF SCI & TECH
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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
This method is to coat the crystallized product to prolong the shelf life, but after the coating, the product needs to be vibrated and sieved to remove hard heads or other sundries in the product, and some of the just wrapped A good film falls off, which affects the effect

Method used

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  • Method for extending warranty period of stannous sulfate

Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] A method for prolonging the shelf life of stannous sulfate, comprising the following steps:

[0028] (1) Preparation of electrolytic acid solution: add boric acid to the sulfuric acid solution, the concentration of the sulfuric acid solution is 15g / L, and the concentration after the addition of boric acid is 1g / L;

[0029] (2) Electrolytic reaction: put the prepared electrolytic acid solution into the electrolytic cell and the refined tin plate for electrolytic reaction, the voltage of the electrolytic cell is 1.8V, and the electrolytic reaction time is 20h;

[0030] (3) Add antioxidant: add pyrogallic acid, hydroquinone and ascorbic acid successively in the solution after reaction finishes, mix uniformly, the concentration after pyrogallic acid adds is 0.1g / L, described terephthalic acid The concentration after the addition of phenol is 0.05g / L, and the concentration after the addition of the ascorbic acid is 0.02g / L;

[0031] (4) The uniformly mixed reaction solution...

Embodiment 2

[0033] A method for prolonging the shelf life of stannous sulfate, comprising the following steps:

[0034] (1) Preparation of electrolytic acid solution: add boric acid to the sulfuric acid solution, the concentration of the sulfuric acid solution is 18g / L, and the concentration after the addition of boric acid is 1.5g / L;

[0035] (2) Electrolytic reaction: put the prepared electrolytic acid solution into the electrolytic cell and the refined tin plate for electrolytic reaction, the voltage of the electrolytic cell is 1.9V, and the electrolytic reaction time is 20h;

[0036] (3) Add antioxidant: add pyrogallic acid, hydroquinone and ascorbic acid successively in the solution after reaction finishes, mix uniformly, the concentration after pyrogallic acid adds is 0.1g / L, described terephthalic acid The concentration after the addition of phenol is 0.06g / L, and the concentration after the addition of the ascorbic acid is 0.03g / L;

[0037] (4) the homogeneously mixed reaction so...

Embodiment 3

[0039] A method for prolonging the shelf life of stannous sulfate, comprising the following steps:

[0040] (1) Preparation of electrolytic acid solution: add boric acid to the sulfuric acid solution, the concentration of the sulfuric acid solution is 20g / L, and the concentration after the addition of boric acid is 2g / L;

[0041] (2) Electrolytic reaction: put the prepared electrolytic acid solution into the electrolytic cell and the refined tin plate for electrolytic reaction, the voltage of the electrolytic cell is 2.0V, and the electrolytic reaction time is 19h;

[0042] (3) Add antioxidant: add pyrogallic acid, hydroquinone and ascorbic acid successively in the solution after reaction finishes, mix uniformly, the concentration after pyrogallic acid adds is 0.2g / L, described terephthalic acid The concentration after the addition of phenol is 0.07g / L, and the concentration after the addition of the ascorbic acid is 0.04g / L;

[0043] (4) The uniformly mixed reaction solution...

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Abstract

The invention relates to a method for extending warranty period of stannous sulfate. The method comprises the following steps of preparation of an electrolytic acid solution adding boric acid into a sulfuric acid solution; electrolyzing reaction: putting the prepared electrolytic acid solution into an electrolysis tank, and generating electrolyzing reaction with a pure tin electrode plate; addingof an antioxidant: sequentially adding pyrogallic acid, hydroquinone and ascorbic acid into the solution after reaction, and uniformly mixing; precipitating the uniformly mixed reaction solution, concentrating and crystallizing, separating solid and liquid, and drying, so as to obtain a stannous sulfate product. The method has the advantages that the risk of oxidizing of local crystals due to cracking of crystals is avoided, and the problem of degrading of anti-oxidizing property of the product with falling of coating film is solved.

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. 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 industry, as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00C01G19/00
CPCC01G19/00C25B1/00
Inventor 叶有明覃逸明张诚廖政达陈碧
Owner GUANGXI NORMAL UNIV OF SCI & TECH