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Calcium metaphosphorate production process

A calcium metaphosphate and production process technology, applied in the field of calcium metaphosphate production process, can solve the problems of unstable product quality, complex production process, high cost, etc., and achieve the effect of compact structure, simple production process and low cost

Inactive Publication Date: 2006-07-12
MEDICAL COLLEGE OF XIAN JIAOTONG UNIV
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AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a production process of calcium metaphosphate, which solves the technical problems of complex production process, high cost, low efficiency and unstable product quality in the background technology

Method used

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specific Embodiment approach

[0034] DETAILED DESCRIPTION Precipitating agent can adopt metastannic acid or high molecular polymer etc.

[0035] The principle of production technique of the present invention is as follows:

[0036] The milk of lime and phosphoric acid are neutralized to form calcium dihydrogen phosphate solution. Because milk of lime contains impurities such as iron, copper, nickel, manganese, cobalt, lead, and arsenic, a precipitant is added to filter out impurities such as iron, copper, nickel, manganese, cobalt, lead, and arsenic by using the principle of adsorption and co-precipitation. Concentrate calcium dihydrogen phosphate with a solid content of 50% or more, and condense it into calcium metaphosphate through high-temperature centrifugal spray drying to obtain finished calcium metaphosphate that fully meets the requirements of modern biological glass and special optical glass.

[0037] Concrete production technique of the present invention is as follows:

[0038] 1. Take the lime...

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Abstract

The invention discloses a manufacturing technology of calcium metaphosphate, which comprises the following steps: placing lime cream in the reaction container; adding the deionized water to immerse the raw material; heating; stirring; adding phosphate slowly until the pH value is 3-3.5; fetching the filter liquid to obtain the synthetic filter of calcium biphosphate; adding the deionized water to dilute the solution at 1.05-1.10 specific gravity; cooling; adding hydrogen dioxide solution; stirring; adding precipitant; stewing; filtering the calcium biphosphate in another container; heating the solution to concentrate at 1.3-1.35 specific gravity; subsiding the phosphate again; adjusting the pH value at 3.2; shifting the material in the spray drying tower to compress into calcium metaphosphate after filtering. The invention simplifies the manufacturing technology and reduces the cost, which improves the production quality and stability.

Description

technical field [0001] The invention relates to a production process of calcium metaphosphate, in particular to a kind of low-impurity glass for modern medical biological glass and special optical glass, and the content of impurities iron, copper, nickel, manganese, cobalt, arsenic and lead is less than 2PPm The production process of calcium metaphosphate. Background technique [0002] The traditional production method of calcium metaphosphate is to crystallize calcium dihydrogen phosphate, dehydrate it to make anhydrous calcium dihydrogen phosphate, and then calcine it at high temperature. The production method mainly has the following defects or deficiencies: [0003] 1. The production process is complicated and the efficiency is low. [0004] 2. The drying process has low thermal efficiency and high energy consumption. The thermal efficiency of the drying process is only about 26%. [0005] 3. The production cost is higher. [0006] 4. The reliability of equipment pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/44
Inventor 俞小瑞王淑红邱志明刘明钢
Owner MEDICAL COLLEGE OF XIAN JIAOTONG UNIV
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