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Production method for preparing high-purity calcium phosphite from sodium hypophosphite industrial waste residues

A technology of high-purity calcium phosphite and sodium hypophosphite, which is applied in the direction of phosphorous acid, phosphorus oxyacids, chemical instruments and methods, etc., can solve problems such as non-conformity to use requirements, low purity of calcium phosphite, and great environmental hazards. Achieve the effects of improving exchange speed and work efficiency, good chemical stability and large resin volume

Inactive Publication Date: 2020-12-08
江苏康祥实业集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the continuous expansion of the application field of sodium hypophosphite and the increase of production capacity, a large amount of industrial waste residue containing calcium phosphite is produced in the industrial production of sodium hypophosphite. At present, the annual output of sodium hypophosphite in my country accounts for about 30% of the world's total output. 70%, reaching hundreds of thousands of tons. At the same time, the industrial waste residue of sodium hypophosphite is becoming more and more harmful to the environment. Most of them in China adopt the method of digging and burying the ground for treatment, which leads to soil pollution and resource loss. Waste, and the purity of calcium phosphite produced by the existing part of the production method of calcium phosphite is low, which does not meet the requirements for use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment one: a kind of sodium hypophosphite industrial waste residue prepares the production method of high-purity calcium phosphite, comprises the steps:

[0027] 1) Pretreatment: take an appropriate amount of sodium hypophosphite waste residue, and use a dryer to dry at 105°C until it reaches a constant weight;

[0028] 2) Acid hydrolysis: put the pretreated sodium hypophosphite waste residue into the acid hydrolysis pool, inject sulfuric acid into the acid hydrolysis pool, and fully stir and mix the sodium hypophosphite waste residue and sulfuric acid. Stir for 0.5h, then filter the mixture of waste residue and sulfuric acid, collect the filtrate for storage, and wait for the ion exchange resin method to remove impurities from the filtrate;

[0029] 3) Resin selection: Ion exchange resins should be compared with those with large capacity, good selectivity, fast exchange speed, high strength, easy regeneration, and cheap and easy to obtain. Therefore, it is more ap...

Embodiment 2

[0035]Embodiment two: a kind of sodium hypophosphite industrial waste residue prepares the production method of high-purity calcium phosphite, comprises the steps:

[0036] 1) Pretreatment: take an appropriate amount of sodium hypophosphite waste residue, and use a dryer to dry at 105°C until it reaches a constant weight;

[0037] 2) Acid hydrolysis: Put the pretreated sodium hypophosphite waste residue into the acid hydrolysis pool, inject sulfuric acid into the acid hydrolysis pool, make the sodium hypophosphite waste residue and sulfuric acid fully mix and mix, and at the same time, adjust the reaction temperature to 70°C, Stir for 1h, then filter the mixture of waste residue and sulfuric acid, collect the filtrate for storage, and wait for the ion exchange resin method to remove impurities from the filtrate;

[0038] 3) Resin selection: Ion exchange resins should be compared with those with large capacity, good selectivity, fast exchange speed, high strength, easy regenera...

Embodiment 3

[0044] Embodiment three: a kind of sodium hypophosphite industrial waste residue prepares the production method of high-purity calcium phosphite, comprises the steps:

[0045] 1) Pretreatment: take an appropriate amount of sodium hypophosphite waste residue, and use a dryer to dry at 105°C until it reaches a constant weight;

[0046] 2) Acid hydrolysis: put the pretreated sodium hypophosphite waste residue into the acid hydrolysis pool, inject sulfuric acid into the acid hydrolysis pool, make the sodium hypophosphite waste residue and sulfuric acid fully mix and mix, and at the same time, adjust the reaction temperature to 80°C, Stir for 1.5h, then filter the mixture of waste residue and sulfuric acid, collect the filtrate for storage, and wait for the ion exchange resin method to remove impurities from the filtrate;

[0047] 3) Resin selection: Ion exchange resins should be compared with those with large capacity, good selectivity, fast exchange speed, high strength, easy reg...

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Abstract

The invention discloses a production method for preparing high-purity calcium phosphite from sodium hypophosphite industrial waste residues. The production method comprises the following steps: pretreating: taking a proper amount of sodium hypophosphite waste residues, and drying at 105 DEG C by using a dryer until constant weight is reached; performingacidolysis: putting the pretreated sodium hypophosphite waste residues into an acidolysis pool, injecting sulfuric acid into the acidolysis pool, and fully stirring and uniformly mixing the sodium hypophosphite waste residues and the sulfuric acid; and pretreating resin: taking saturated edible salt water with the volume two times that of resin, putting the resin into edible salt water, soaking for 24 h, and then repeatedly washing the resinwith deionized water till washing water is yellow and the color is transparent. According to the production method for preparing the high-purity calcium phosphite from the sodium phosphate industrialwaste residues, the sodium hypophosphite industrial waste residues can be used for producing the calcium phosphite, the purity of the calcium phosphite is high, meanwhile, recycling of the waste residues is achieved, environmental pollution is avoided, the additional value of an enterprise is increased, and practicability is high.

Description

technical field [0001] The invention relates to the technical field of calcium phosphite production, in particular to a production method for preparing high-purity calcium phosphite from industrial waste residue of sodium hypophosphite. Background technique [0002] With the continuous expansion of the application field of sodium hypophosphite and the increase of production capacity, a large amount of industrial waste residue containing calcium phosphite is produced in the industrial production of sodium hypophosphite. At present, the annual output of sodium hypophosphite in my country accounts for about 30% of the world's total output. 70%, reaching hundreds of thousands of tons. At the same time, the industrial waste residue of sodium hypophosphite is becoming more and more harmful to the environment. Most of them in China adopt the method of digging and burying the ground for treatment, which leads to soil pollution and resource loss. Waste, and the calcium phosphite purity...

Claims

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Application Information

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IPC IPC(8): C01B25/163C01B25/46
CPCC01B25/163C01B25/468
Inventor 朱雪松冯振华刘仕通高宏福钱旭
Owner 江苏康祥实业集团有限公司