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Technology for producing phosphate from pyrophosphate

A pyrophosphate and phosphate technology, which is applied in the field of phosphorus chemical industry, can solve the problems of increasing processing procedures, increasing equipment investment, hindering the reuse, application and promotion of phosphorus-containing wastes, and achieving a concise process route and product quality. Enhancement, good environmental protection effect

Active Publication Date: 2015-04-01
SHIFANG SUNDIA CHEM IND LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But the problem that above-mentioned technique exists is: directly recrystallize pyrophosphate or adjust PH to remove the technique of metal impurity, recrystallize remaining a large amount of mother liquors, or generate a large amount of metal impurity precipitations, increase follow-up processing procedure, and improve production efficiency Investment in equipment hinders the application and promotion of phosphorus reuse in phosphorus-containing waste to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Take crude sodium pyrophosphate with a sodium pyrophosphate content of more than 81%, add water to wash and perform desalination treatment, and the content of sodium chloride in the obtained desalted crude sodium pyrophosphate is lower than 0.8%;

[0034] (2) Take 1000g of the obtained desalted crude sodium pyrophosphate, add 2500g of water, heat to dissolve and filter to remove the insoluble solid;

[0035] (3) Heat up the obtained sodium pyrophosphate solution for hydrolysis reaction. The reaction temperature is 130-150°C, the reaction pressure is 0.4MP, and the reaction time is 3h. The depolymerized sodium phosphate solution is obtained. The pH value of the obtained sodium phosphate solution is 8.7;

[0036] (4) Add 10g of sodium sulfide to the obtained sodium phosphate solution, stir, set aside for precipitation and filter to obtain the product sodium phosphate solution. 25ppm.

[0037] further

[0038] (5) Add 700g of 85% phosphoric acid to the obtained prod...

Embodiment 2

[0040] (1) Take the crude sodium pyrophosphate with a sodium pyrophosphate content of more than 81% and grind it to 60 meshes, add water to wash the crushed crude sodium pyrophosphate and perform desalination treatment, so that the content of sodium chloride in the desalted crude sodium pyrophosphate less than 0.6%;

[0041] (2) Take 1000g of the obtained desalted crude sodium pyrophosphate, add 2500g of water, heat to dissolve and filter to remove the insoluble solid;

[0042] (3) Add 60g of sodium carbonate to the obtained sodium pyrophosphate solution, stir evenly and heat up to carry out the hydrolysis reaction, the reaction temperature is controlled at 125-130°C, the reaction pressure is about 0.25MPa, and the reaction time is 4h to obtain depolymerized Sodium phosphate solution, the pH value of gained sodium phosphate solution is 10;

[0043] (4) Add 85% phosphoric acid to the obtained sodium phosphate solution to adjust the pH of the solution to 7, stir, set aside for pr...

Embodiment 3

[0047] (1) Take the crude sodium pyrophosphate with a sodium pyrophosphate content of more than 81% and grind it to 60 meshes, add water to wash the crushed crude sodium pyrophosphate and perform desalination treatment, so that the content of sodium chloride in the desalted crude sodium pyrophosphate less than 0.6%;

[0048] (2) Take 1000g of the obtained desalted crude sodium pyrophosphate, add 2500g of water, heat to dissolve and filter to remove the insoluble solid;

[0049] (3) Add 30% sodium hydroxide to the obtained sodium pyrophosphate solution to adjust the pH of the solution to 12.0, stir evenly and heat up to carry out the hydrolysis reaction. The reaction temperature is controlled at 170-200°C, the reaction pressure is about 0.8MPa, and the reaction time is For 1h, the sodium phosphate solution after depolymerization was obtained, and the pH value of the gained sodium phosphate solution was 10.0;

[0050] (4) Add 5g of phosphorus pentasulfide to the obtained sodium...

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Abstract

The invention discloses a technology for producing phosphate from pyrophosphate and belongs to the technical field of the phosphorus chemical industry. The technology comprises steps as follows: the pyrophosphate is heated and dissolved after water is added to the pyrophosphate, a phosphate solution is obtained through depolymerization, and metal ion impurities in the phosphate solution are removed through sedimentation, and a product phosphate solution is obtained through filtration. According to the technology for producing the phosphate from the pyrophosphate, depolymerization is performed before removal of the metal ion impurities creatively, so that obtained sediment exists in the form of an inorganic compound; compared with existing routes, the technology has the advantages that the recovery rate of the phosphorus can be increased by more than 7%, depolymerization is performed before removal of the metal ion impurities, the content of residual metal ions in an obtained depolymerization solution is low, the product quality of the phosphate is substantially improved, the technology is simple in route, low in fixed equipment input, low in running cost, good in environmental protection benefit, high in technological operability, high in percent of pass of products and beneficial to application and popularization of recycling of the phosphorus of phosphorus waste, and major products and by-products are recovered at a time.

Description

technical field [0001] The invention relates to a process for recycling phosphorus-containing waste, in particular to a process for producing phosphate by using pyrophosphate, which belongs to the technical field of phosphorus chemical industry. Background technique [0002] In recent years, due to the pressure of resources and environmental protection, people have paid more and more attention to the technology of removing and recovering phosphorus from phosphorus-containing waste. With the development and continuous maturity of phosphorus-containing wastewater resource recovery and utilization technology, a large number of phosphate products are formed through the recovery of phosphorus elements in high-phosphorus pesticide production waste and phosphorus chemical industry high-phosphorus wastewater. [0003] In the existing phosphorus recovery technology that uses by-product pyrophosphate as raw material, the main process route is to depolymerize and repolymerize pyrophosp...

Claims

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Application Information

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IPC IPC(8): C01B25/26
Inventor 刘健王长胜杨友春
Owner SHIFANG SUNDIA CHEM IND LIMITED