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A kind of recovery treatment method of stannous pyrophosphate waste residue

A stannous pyrophosphate, recycling and processing technology, applied in the direction of phosphorus compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problem of not finding the relevant literature and patent reports, finished products, etc. of stannous pyrophosphate waste residue recycling, To achieve the effect of reducing waste, improving direct yield and improving utilization rate

Active Publication Date: 2015-09-30
GUANGXI HUAXI GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are few studies on the production method of stannous pyrophosphate, among which the Chinese patent application number is CN201210481363.2, and the name is "a method for preparing high-purity stannous pyrophosphate" and the Chinese patent application number is CN200810080821.5, and the name is " The method for preparing stannous pyrophosphate" patent report stated that the current production method of stannous pyrophosphate is mainly prepared by reacting stannous chloride or stannous sulfate with pyrophosphate, and the raw materials used in this method are commercially available sales of chemicals, the finished product is relatively high, and the present applicant has not yet found relevant literature and patent reports on the recycling and treatment of stannous pyrophosphate waste residue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Put 200kg stannous pyrophosphate waste residue into 3m 3 In the reactor, add 300 L of concentrated hydrochloric acid with a mass fraction of 35%, stir until the stannous pyrophosphate waste residue is completely dissolved, put it into a filter plate, filter, and pump the filtrate to the high tank of the reactor for subsequent use;

[0022] (2) After washing the reactor with water, in 3m 3 Add 400L of deionized water into the reaction kettle, and then add 100kg of sodium carbonate under constant stirring. After the sodium carbonate is completely dissolved, steam heating will raise the solution temperature to 90°C. Under constant stirring, add the high level tank filtrate dropwise. Until the pH of the reaction solution is 2.5, continue to keep warm for 30 minutes for later use;

[0023] (3) The above-mentioned spare reaction solution was successively dried by centrifugation, washed, and vacuum-dried to obtain 180 kg of stannous pyrophosphate product, and the mass p...

Embodiment 2

[0025] (1) Put 200kg stannous pyrophosphate waste residue into 3m 3 In the reactor, add 350 L of water and 350 L of concentrated sulfuric acid with a mass fraction of 98%, stir until the stannous pyrophosphate waste residue is completely dissolved, put it into a filter plate, filter, and pump the filtrate to the high tank of the reactor for later use;

[0026] (2) After washing the reactor with water, in 3m 3 Add 400L of deionized water to the reaction kettle, and then add 100kg of sodium carbonate under constant stirring. After the sodium carbonate is completely dissolved, steam heating will raise the solution temperature to 70°C. Under continuous stirring, add the high level tank filtrate dropwise. Until the pH of the reaction solution is 3, continue to keep warm for 30 minutes for later use;

[0027] (3) The above-mentioned standby reaction solution was successively dried by centrifugation, washed, and vacuum-dried to obtain 173 kg of stannous pyrophosphate product, and...

Embodiment 3

[0029] (1) Put 200kg stannous pyrophosphate waste residue into 3m 3 In the reactor, add 350 L of water and 350 L of concentrated sulfuric acid with a mass fraction of 98%, stir until the stannous pyrophosphate waste residue is completely dissolved, put it into a filter plate, filter, and pump the filtrate to the high tank of the reactor for subsequent use;

[0030] (2) After washing the reactor with water, in 3m 3 Add 400L of deionized water into the reaction kettle, and then add 75kg of sodium hydroxide under continuous stirring. After the sodium hydroxide is completely dissolved, the steam heating temperature rises to 80°C. The pH of the reaction solution was 3.5, and it was kept warm for 30 minutes for later use;

[0031] (3) The above-mentioned spare reaction solution was successively dried by centrifugation, washed, and vacuum-dried to obtain 171 kg of stannous pyrophosphate product, and the mass percentage of stannous pyrophosphate was 99.21%.

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Abstract

The invention discloses a recycling treatment method for stannous pyrophosphate waste slag. The recycling treatment method comprises the following steps: (1) adding concentrated acid into the stannous pyrophosphate waste slag to be dissolved; filtering to obtain a filtering solution for later use; (2) heating alkali liquid to 70-90 DEG C and dripping the filtering solution until the pH is 2-4 under an agitating state and preserving the heat to react for 30-60 minutes to obtain a mixed solution; (3) centrifuging and drying the mixed solution; and washing and drying in vacuum to obtain a stannous pyrophosphate product. The invention provides the recycling treatment method for the stannous pyrophosphate waste slag so that the produced waste slag is reused and the waste of resources is reduced; a tin metal resource is recycled, the utilization rate of the resource is improved and the direct yield of the product is improved.

Description

technical field [0001] The invention belongs to the technical field of recycling stannous pyrophosphate, and in particular relates to a method for recycling and treating stannous pyrophosphate waste residue. Background technique [0002] Stannous pyrophosphate is colorless or white powder at room temperature, insoluble in water, and its performance is stable when stored and used. Stannous pyrophosphate is widely used, mainly used for tin plating of cyanide-free electroplating; used as a filling agent for toothpaste, slightly dissociated in toothpaste, and has a certain effect on preventing dental diseases; used for dyeing in the printing and dyeing industry; used in the ceramic industry Appropriate addition in the paint industry can slow down the settling speed of the paint filler in the paint and improve the paint performance. [0003] At present, there are few studies on the production method of stannous pyrophosphate, among which the Chinese patent application number is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/42
Inventor 叶有明谢雪珍张诚阮桦吴伯增农永萍廖珍旭陈进中伍祥武杨育兵王运龙荣桂能
Owner GUANGXI HUAXI GRP CO LTD
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