Method for preparing calcium phosphate by utilizing slag charge discharged during sodium hypophosphite preparation

A technology of calcium phosphite and sodium hypophosphite, applied in the chemical industry, can solve problems such as environmental pollution and energy consumption, and achieve the effects of less investment in equipment, solving environmental pollution, and reasonable utilization of resources

Active Publication Date: 2013-04-24
王军民
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  • Application Information

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Problems solved by technology

The slag is oxidized calcium phosphite to calcium orthophosphate in the rotary kiln under high temperature conditions to obtain fertilizer grade tricalcium phosphate products. Using this production process is a low-end industrial route, which consumes energy and pollutes surroundings

Method used

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  • Method for preparing calcium phosphate by utilizing slag charge discharged during sodium hypophosphite preparation
  • Method for preparing calcium phosphate by utilizing slag charge discharged during sodium hypophosphite preparation
  • Method for preparing calcium phosphate by utilizing slag charge discharged during sodium hypophosphite preparation

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Embodiment Construction

[0044] Below in conjunction with accompanying drawing 1 and attached figure 2 Examples illustrating, but not limited to, the invention are as follows:

[0045] See attached picture 1:

[0046] In Figure 1, point A calcium dihydrogen phosphite monohydrate Ca(H 2 PO 3 ) 2 ·H 2 O solid phase formation point, B point calcium phosphite monohydrate CaHPO 3 ·H 2 o

[0047]The solid phase forms a point, the point E monohydrate calcium phosphite and the monohydrate calcium phosphite co-saturated solution form a point, the curve of the saturated solubility of the line segment ME monohydrate calcium phosphite salt; the line segment DE monohydrate calcium phosphite Salt saturation solubility curve; ΔAME monohydrate calcium dihydrogen phosphite salt crystallization region, ΔEBD monohydrate calcium salt crystallization region, ΔEAB monohydrate calcium phosphite and monohydrate calcium salt crystallization of two calcium salts Area.

[0048] Below with the slag material that produce...

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Abstract

The invention relates to a method for preparing calcium phosphate by utilizing slag charge discharged during sodium hypophosphite preparation. Calcium hydroxide and calcium carbonate in the slag charge react with phosphorous acid to generate calcium phosphate monohydrate, phosphorous acid is prepared according to the condition that the content of calcium hydroxide in the slag discharge is 35.48wt% and the content of calcium carbonate in the slag discharge is 10.91%, calcium phosphate is generated at a certain temperature under a stirring condition, and washing, filtering, drying and smashing are performed after the PH value is regulated, so that pure calcium phosphate is obtained. The method provided by the invention has the following prominent advantages: 1, resource utilization is reasonable, the low-end resource is extended to a high-end product; 2, the equipment investment is small, the process is simple, production is easy to control and the method is environmentally-friendly; and 3, the method provided by the invention can be used for solving the pollution of slag charge discharged by enterprise sodium hypophosphite to environment, and reducing the production cost.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for producing calcium phosphite by using industrial waste. Background technique [0002] Sodium hypophosphite is the main raw material of electroless plating industry. At present, raw materials such as yellow phosphorus, quicklime (CaO), and sodium hydroxide are used both at home and abroad, and sodium hypophosphite is obtained under certain conditions by a one-step method. The main function of quicklime in the reaction process of sodium hypophosphite is to disperse yellow phosphorus, inhibit the formation of sodium phosphite, and precipitate calcium phosphite at the same time, so as to meet the quality requirements of sodium hypophosphite products. Some unreacted calcium oxide is converted into calcium hydroxide and calcium carbonate and will be discharged together with calcium phosphite. The composition of these slags is as follows: [0003] Composition of dry residu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/163B09B3/00
Inventor 王军民吴树平
Owner 王军民
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