Method for preparing stannous pyrophosphate

A technology of stannous pyrophosphate and metal pyrophosphate, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of high turbidity and low turbidity of electroplating solution, and achieve the improvement of electroplating quality, The effect of turbidity reduction

Inactive Publication Date: 2008-08-06
易鹤翔
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiency that the turbidity of the electroplating solution prepared by the existing stannous pyrophosphate is large, the invention provides a method for preparing stannous pyrophosphate with a low turbidity of the prepared electroplating solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Dissolve 20kg of sodium pyrophosphate in 600kg of water, add 33.9kg of stannous chloride with a storage time of 10 hours while stirring at room temperature, and make 60kg of the solution, adjust the pH value of the reaction end point to 1-2 with hydrochloric acid or alkali, wash the reaction with water to no Cl - , filtered, dried, and pulverized to obtain 30.2kg of a white powdery product with a tin content of 57.2%.

Embodiment 2

[0014] Potassium pyrophosphate 24.8kg was dissolved in 600kg of water, and 60kg of the solution formed by adding tin protochloride with a storage time of 62 hours was added during stirring at room temperature, and the pH value of the reaction end was adjusted to 2-4 with hydrochloric acid or alkali, and the reactant was washed with water until Cl-free - , filtered, dried, and pulverized to obtain 30.6k of a white powdery product with a tin content of 57.18%.

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Abstract

The invention discloses a method for preparing stannous pyrophosphate. The technique of the method is as follow: stannous chloride and stannous sulfate with a short time retention period (0 to 72 hours) reacts with stoichiometric alkali metal pyrophosphate solution (thickness of 1 to 30 percent) in room temperature; the reaction precipitate is washed by water until Cl<-> is less than 1 percent; white powder products are obtained after filtering, drying and crashing. The complex compound solution which is formed by the products and alkali metal pyrophosphate is colourless and transparent, and has a turbidity degree merely of 0 to 5.

Description

technical field [0001] The invention belongs to the technical field of metal chemical production, in particular to a method for preparing stannous pyrophosphate. Background technique [0002] At present, there is no detailed literature report on the production method of stannous pyrophosphate. Usually, it is produced by reacting stannous chloride with potassium pyrophosphate or sodium pyrophosphate, washing with water, filtering and drying. The products produced are mainly used in electroplating at present. For non-toxic electroplating in industry, since stannous pyrophosphate is insoluble in water, potassium pyrophosphate or sodium pyrophosphate is generally used to form a complex with it and dissolve in water. It is prepared as an electroplating solution, but the electroplating solution prepared by the product produced by the above-mentioned method has a large turbidity, which has a strong impact on the quality of the electroplating product. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/42
Inventor 易鹤翔
Owner 易鹤翔
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