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Production technology and application of calcium hydrophosphate

A technology of calcium hydrogen phosphate and production process, which is applied in the field of calcium hydrogen phosphate preparation, and achieves the effects of simple synthesis process, easy availability of raw materials and little environmental pollution

Inactive Publication Date: 2013-03-27
LIAONING GOLDEN ANCHOR IND
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of producing calcium hydrogen phosphate amorphous form in other ways, the purpose of the present invention is to provide a production process and application of calcium hydrogen phosphate. little pollution

Method used

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Embodiment 1

[0015] 1. Solution preparation:

[0016] Diammonium hydrogen phosphate solution: Concentration: 2.5mol / L

[0017] pH value: 7.6

[0018] Temperature: 30°C

[0019] Calcium chloride solution: Concentration: 2.5mol / L

[0020] pH: 5.0

[0021] Temperature: 30°C

[0022] 2. Synthesis, washing, pulping

[0023] 1. First fill the first synthesis tank (the two synthesis tanks are continuous) with deionized water, and turn on the stirring. Turn on the flowmeters of the diammonium hydrogen phosphate solution and the calcium chloride solution according to requirements, the flow rates are 800L / hour and 840L / hour respectively, and the synthesis temperature is 30°C.

[0024] 2. When the second synthesis tank is filled with slurry, open the belt filter to separate the mother liquor, and start the washing device to wash the cake (calcium hydrogen phosphate dihydrate) to make the cake contain less than 500PPM of chloride ions. The cake falls from the filter cloth into the recycled slur...

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Abstract

The invention relates to a production technology and application of calcium hydrophosphate. The production technology comprises the following steps of: by using an ammonium dibasic phosphate and a calcium chloride solution as raw materials, carrying out double liquid phases to obtain hydryoxyapetite by stirring at a certain temperature and flow rate, then dewatering through a belt filter to separate and washing a mother liquid till chloride ions reach 500PPM, thus obtaining hydryoxyapetite; adding a certain amount of deionized water to hydryoxyapetite, adjusting a slurry ratio to be in line with technological requirements, adding a certain amount of acid, carrying out high-temperature digestion after adjusting a pH value, observing the state of the slurry after raising the temperature to 90 DEG C, stopping heating when the slurry is expanded and solidified, and removing two crystal water after settling for 30 minutes, thereby obtaining calcium phosphate dibasic anhydrous; carrying out washing chlorine, dewatering, drying and sieving, thus obtaining the calcium hydrophosphate finished product. The production technology has the advantages that the synthetic technology is simple, raw materials are easily obtained, by-products can be recycled, and the environmental pollution is little.

Description

technical field [0001] The invention belongs to the field of calcium hydrogen phosphate preparation, and in particular relates to a production process and application of calcium hydrogen phosphate. Background technique [0002] There are many ways to produce calcium hydrogen phosphate (that is, calcium monohydrogen phosphate), although its calcium-phosphorus ratio and the content of various impurities can meet the requirements for the production of calcium halophosphate phosphor, but due to the calcium hydrogen phosphate in halophosphoric acid Calcium phosphors account for more than 80% of the preparation, which is the skeleton of phosphors, so the requirements for the crystal form of calcium hydrogen phosphate are strict. Incomplete and thin calcium hydrogen phosphate crystals will affect the brightness of phosphors and increase Large light attenuation reduces the quality and service life of the phosphor, and the particle shape of calcium hydrogen phosphate synthesized by t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32C09K11/71
Inventor 孙兴民周人周
Owner LIAONING GOLDEN ANCHOR IND
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