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Preparation method of optical-grade calcium metaphosphate

An optical-grade calcium metaphosphate technology, which is applied in the field of preparation of optical-grade calcium metaphosphate, can solve the problems of lagging development of fine phosphorus chemical products, lack of international market competitiveness, etc., and achieve the effect of high purity

Inactive Publication Date: 2020-07-17
上海太洋科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although my country is already a major producer of phosphorus chemicals, the development of high-addition and fine phosphorus chemical products lags behind and lacks competitiveness in the international market

Method used

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  • Preparation method of optical-grade calcium metaphosphate
  • Preparation method of optical-grade calcium metaphosphate
  • Preparation method of optical-grade calcium metaphosphate

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preparation example Construction

[0024] Such as figure 1 Shown, the preparation method of the optical grade calcium metaphosphate of technical scheme of the present invention comprises the steps:

[0025] 1) the calcium source ( figure 1 Take industrial-grade calcium hydroxide as an example) react with industrial-grade phosphoric acid and water in a certain proportion under heating and pressurized conditions to obtain crude calcium dihydrogen phosphate solution;

[0026] 2) adjust the concentration of the crude calcium dihydrogen phosphate solution and make it pass through the ion exchange resin to remove non-ferrous metals and impurity ions;

[0027] 3) evaporating and concentrating the solution after passing through the ion exchange resin, and concentrating it to more than 25%;

[0028] 4) Carry out clean calcination for the first time to remove free water and structural water to obtain calcium metaphosphate intermediate powder;

[0029] 5) Carry out the second clean calcination to obtain the optical gra...

Embodiment 1

[0031] The preparation method of the optical grade calcium metaphosphate of the embodiment of the present invention, comprises the following steps:

[0032] 1) Add 100kg of calcium hydroxide with a content of 98% to dilute phosphoric acid blended with 307.6kg of 85% industrial phosphoric acid and 738.4kg of water for reaction. Control the reaction temperature at 125°C to 128°C and the reaction pressure at 0.3 MPa~0.34MPa, the reaction time is 5h~6h, and the crude calcium dihydrogen phosphate solution is obtained;

[0033] 2) Adjust the concentration of the crude calcium dihydrogen phosphate solution to 11%, and pass through the ion exchange resin at a flow rate of 4.5L / min to remove non-ferrous metals such as Fe, Mn, Pb, Cr, Cu, Ni, Co and Cl - , sulfate and other impurities, wherein the ion exchange resin is composed of D402, D405, IONRESIN 1600 type cation exchange resin and D201, D407 type anion exchange resin;

[0034] 3) Evaporating and concentrating the solution after p...

Embodiment 2

[0038] The preparation method of the optical grade calcium metaphosphate of the embodiment of the present invention, comprises the following steps:

[0039] 1) Add 110kg of calcium hydroxide with a content of 97% to dilute phosphoric acid blended with 334.1kg of 85% industrial phosphoric acid and 801.9kg of water for reaction, control the reaction temperature at 128°C to 132°C, and the reaction pressure at 0.34 MPa~0.37MPa, the reaction time is 4h~5h, and the crude calcium dihydrogen phosphate solution is obtained;

[0040] 2) Adjust the concentration of the crude calcium dihydrogen phosphate solution to 12%, and pass through the ion exchange resin at a flow rate of 4.2L / min to remove non-ferrous metals such as Fe, Mn, Pb, Cr, Cu, Ni, Co and Cl - , sulfate and other impurities, wherein the ion exchange resin is composed of D401, D402 type cation exchange resin and 201×7, D201, D202 type anion exchange resin;

[0041] 3) Evaporating and concentrating the solution after passing...

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Abstract

The technical scheme of the invention provides a preparation method of optical-grade calcium metaphosphate, wherein the preparation method comprises the following steps that: carrying out a reaction of a calcium source, phosphoric acid and water according to a certain proportion under the heating and pressurizing conditions, to obtain a crude monocalcium phosphate solution, wherein the calcium source is selected from calcium hydroxide or calcium oxide; adjusting the concentration of the crude monocalcium phosphate solution and enabling the crude monocalcium phosphate solution to pass through ion exchange resin so as to remove non-ferrous metals and impurity ions; evaporating and concentrating the solution passing through the ion exchange resin, and concentrating to 25% or more; cleaning and calcining for the first time to remove free water and structural water to obtain calcium metaphosphate intermediate powder; and carrying out secondary clean calcination to obtain the optical-grade calcium metaphosphate finished product. According to the technical scheme, the preparation method is high in adaptability to the raw material calcium hydroxide or calcium oxide, the prepared calcium metaphosphate is high in purity, all indexes meet the requirements of optical glass and laser glass raw materials, and a key high-purity raw material is provided for industrial production of laser glassand civil optical glass.

Description

technical field [0001] The invention relates to the field of fine inorganic phosphorus chemical industry, in particular to a preparation method of optical-grade calcium metaphosphate. Background technique [0002] Metaphosphate is the most stable phosphate among dibasic phosphates, and is the basic raw material for making phosphate glass. Due to its excellent light transmission performance, high-purity metaphosphate can not only be used as an important raw material for laser glass in high-power lasers (such as the National Science Project-Shenguang Project), but also for some advanced optical equipment such as camera lenses, high-definition cameras, smart phones, etc. An important raw material for mobile phone lenses and mobile phone panel substrates. Due to the existence of transition metals Fe, Co, Ni, etc., metaphosphate glass will produce strong absorption in the near ultraviolet to infrared region, which will affect the optical properties of the glass. Therefore, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/44C03C1/00
CPCC01B25/44C01P2006/80C01P2006/82C03C1/00
Inventor 蒋加富
Owner 上海太洋科技有限公司
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