Method for preparing stannous pyrophosphate by utilizing stannous chloride high-iron waste liquor

A technology of stannous pyrophosphate and stannous chloride, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problem of high cost, large differences in product particle purity, and no stannous chloride high iron waste found. problems such as liquid recycling reports, to achieve the effect of reducing production costs, increasing recycling channels, and uniform and moderate particles

Active Publication Date: 2014-05-14
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

But the problem that exists is: use various soluble stannous salt products as raw material, can cause the cost of product higher, have produced certain restriction for industrial production, simultaneously various factors such as temperature, reaction solution pH, solution concentration in production Under the influence of the influence, the obtained product particles, purity, etc. are quite different
[0006] The present applicant has not yet found reports on the recycling of stannous chloride high-iron waste liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for preparing stannous pyrophosphate by using stannous chloride high-iron waste liquid comprises the following steps:

[0028] (1) Solution preparation: Dissolve 200g sodium pyrophosphate into 1000g water to obtain sodium pyrophosphate solution;

[0029] (2) Metathesis reaction: Add the sodium pyrophosphate solution into the reaction vessel and stir to raise the temperature to 50°C, then slowly drop the stannous chloride high-iron waste liquid, and measure the pH value of the reaction liquid, when the pH value of the reaction liquid reaches 2 Stop the dropwise addition; after the pH is stable, slowly add hydrochloric acid dropwise into the reactor until the pH drops to 0.5, stop the dropwise addition, and keep warm for 30 minutes.

[0030] (3) After the reaction is over, cool the product to room temperature, dry it, wash it with water until there is no chlorine root, and then stop;

[0031] (4) Drying: put the washed product into a dryer for rotary drying at 9...

Embodiment 2

[0033] A method for preparing stannous pyrophosphate by using stannous chloride high-iron waste liquid comprises the following steps:

[0034] (1) Solution preparation: Dissolve 260g of sodium pyrophosphate into 1000g of water to obtain sodium pyrophosphate solution;

[0035] (2) Metathesis reaction: Add sodium pyrophosphate solution into the reaction vessel and stir to raise the temperature to 60°C, then slowly drop into stannous chloride high-iron waste liquid, and measure the pH value of the reaction liquid, when the pH value of the reaction liquid reaches 2 Stop the dropwise addition; after the pH is stable, slowly dropwise add hydrochloric acid into the reactor until the pH drops to 1, stop the dropwise addition, and keep warm for 30 minutes.

[0036] (3) After the reaction is over, cool the product to room temperature, dry it, wash it with water until there is no chlorine root, and then stop;

[0037] (4) Drying: Put the washed product into the dryer and rotate it at 10...

Embodiment 3

[0040] A method for preparing stannous pyrophosphate by using stannous chloride high-iron waste liquid comprises the following steps:

[0041] (1) Solution preparation: Dissolve 350g sodium pyrophosphate into 1000g water to obtain sodium pyrophosphate solution;

[0042] (2) Metathesis reaction: Add sodium pyrophosphate solution into the reaction vessel and stir to raise the temperature to 60°C, then slowly drop into stannous chloride high-iron waste liquid, and measure the pH value of the reaction liquid, when the pH value of the reaction liquid reaches 2.5 Stop the dropwise addition; after the pH is stable, slowly dropwise add hydrochloric acid into the reactor until the pH drops to 0.8, stop the dropwise addition, and keep warm for 30 minutes.

[0043] (3) After the reaction is over, cool the product to room temperature, dry it, wash it with water until there is no chlorine root, and then stop;

[0044] (4) Drying: Put the washed product into a dryer and perform rotary dryi...

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PUM

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Abstract

The invention discloses a method for preparing stannous pyrophosphate by utilizing stannous chloride high-iron waste liquor. The method comprises the following steps of (1) solution preparation: weighing sodium pyrophosphate, dissolving into water, and preparing a sodium pyrophosphate solution; (2) metathetical reaction: adding the sodium pyrophosphate solution to a reaction vessel, stirring, increasing temperature, then slowly dropping into the stannous chloride high-iron waste liquor, stopping dropping when the pH of reaction liquid is reduced to 2-3, reducing the pH to 0.5-1 by using acid, and then preserving the temperature for reaction; (3) after the reaction is finished, carrying out cooling, solid-liquid separation, washing and drying on a product to obtain a stannous pyrophosphate finished product. According to the invention, the stannous chloride high-iron waste liquor is taken as a raw material to react with the sodium pyrophosphate solution, various indexes of the product stannous pyrophosphate are controlled through concentration, temperature and the pH of the reaction liquid; the obtained product has the advantages of high purity, simple process, low cost and environmental friendliness, provides a new way for the recycling of the stannous chloride high-iron waste liquor and meets the requirement for circular economy.

Description

technical field [0001] The invention belongs to the field of waste liquid recovery and reuse, in particular to a method for preparing stannous pyrophosphate from stannous chloride high-iron waste liquid. Background technique [0002] Tin protochloride, chemical formula: SnCl 2 , the anhydrous is white monoclinic crystal, used in industries such as dyes, spices, mirrors, electroplating; and used as ultra-high pressure lubricating oil, bleaching agent, used as reducing agent, mordant, decolorizing agent and analytical reagent, used for silver , Arsenic, molybdenum, mercury determination. [0003] At present, the industrial production of stannous chloride mainly uses tin metal, hydrochloric acid and chlorine gas as raw materials, and is produced by chemical synthesis. The raw material of hydrochloric acid used is concentrated acid, and iron products are easily corroded. Therefore, the floor waste liquid and washing wastewater recovered from the production site are rich in iro...

Claims

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Application Information

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IPC IPC(8): C01B25/42
Inventor 张诚叶有明谢雪珍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 广西华锡集团股份有限公司
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