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Method for producing calcium phosphate salt and sodium phosphate salt with sodium sulfate wastewater

A technology of sodium phosphate salt and calcium phosphate salt, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of poor utilization of waste water and waste of resources, and achieve recycling, resource conservation, and Simple and reasonable process

Active Publication Date: 2016-06-08
江苏德邦多菱健康科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the production of silica, a large amount of waste water containing sodium sulfate will be produced, which cannot be well utilized in the prior art, resulting in a certain waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1, a kind of method of producing calcium phosphate salt and sodium phosphate salt with sodium sulfate waste water, this method is raw material with the waste water that contains sodium sulfate; First in raw material sodium sulfate waste water, add excessive 5% mass concentration be 80% Phosphoric acid to make the solution acidic and completely acidify sodium sulfate; then add lime milk to it to control the pH value to 2.6 to generate calcium sulfate precipitate and remove the sulfate radical in the solution; filter and continue to add lime milk to the filtrate to control the pH The value is 6.5. After the reaction, the solid is calcium hydrogen phosphate, and the liquid is mainly sodium phosphate.

Embodiment 2

[0014] Embodiment 2, a kind of method of producing calcium phosphate salt and sodium phosphate salt with sodium sulfate waste water, this method is raw material with the waste water that contains sodium sulfate; It is 90% to add excessive 15% mass concentration in raw material sodium sulfate waste water Phosphoric acid to make the solution acidic and completely acidify sodium sulfate; then add lime milk to it to control the pH value to 3.2 to generate calcium sulfate precipitation and remove sulfate radicals in the solution; filter and continue to add lime milk to the filtrate to control the pH The value is 7.0. After the reaction, the solid is calcium hydrogen phosphate, and the liquid is mainly sodium phosphate.

Embodiment 3

[0015] Embodiment 3, a kind of method of producing calcium phosphate salt and sodium phosphate salt with sodium sulfate waste water, this method is raw material with the waste water that contains sodium sulfate; It is 85% to add excessive 10% mass concentration in raw material sodium sulfate waste water Phosphoric acid to make the solution acidic and completely acidify sodium sulfate; then add lime milk to it to control the pH value to 2.9 to generate calcium sulfate precipitation and remove sulfate radicals in the solution; filter and continue to add lime milk to the filtrate to control the pH The value is 6.7. After the reaction, the solid is calcium hydrogen phosphate, and the liquid is mainly sodium phosphate. This scheme can realize the conversion of 90% sodium sulfate.

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PUM

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Abstract

The present invention is a method for producing calcium phosphate salt and sodium phosphate salt by using sodium sulfate wastewater. The method uses wastewater containing sodium sulfate as raw material; 90% phosphoric acid makes the solution acidic and completely acidifies sodium sulfate; then add milk of lime to it to control the pH value of 2.6~3.2 to generate calcium sulfate precipitate and remove the sulfate radical in the solution; filter and continue to add to the filtrate Lime milk, the pH value is controlled at 6.5~7.0. After the reaction, the solid is calcium hydrogen phosphate, and the liquid is mainly sodium phosphate. The process of the invention is simple and reasonable, with strong operability and high conversion rate. It treats waste water and saves resources, which not only protects the environment but also realizes the recycling of resources. It is verified by experiments that the present invention can convert 80% to 90% of sodium sulfate.

Description

technical field [0001] The invention relates to a method for preparing phosphate, in particular to a method for producing calcium phosphate and sodium phosphate by using sodium sulfate wastewater. Background technique [0002] Sodium sulfate, an inorganic compound, sodium sulfate decahydrate, also known as Glauber's salt, is a white, odorless, bitter crystal or powder, hygroscopic. Appearance is colorless, transparent, large crystals or granular small crystals. It is mainly used in the production of sodium silicate, glass, enamel, pulp, refrigeration mixture, detergent, desiccant, dye thinner, analytical chemical reagents, pharmaceuticals, etc. Sodium sulfate is widely found in nature and chemical waste. During the production of silica, a large amount of waste water containing sodium sulfate will be produced, which cannot be well utilized in the prior art, resulting in a certain waste of resources. Contents of the invention [0003] The technical problem to be solved by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/32C01B25/30
Inventor 赵祥海
Owner 江苏德邦多菱健康科技有限公司