Preparation method of lanthanum metaphosphate as high-purity optical glass additive

An optical glass, lanthanum metaphosphate technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problem that the content of pure metal ion elements of lanthanum metaphosphate cannot meet the requirements of technical indicators, and achieve low implementation costs and reduced costs. The effect of high production cost and high utilization rate of raw materials

Active Publication Date: 2019-07-23
莹科新材料股份有限公司
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Problems solved by technology

[0003] In order to solve the problem that the purity and metal ion element content of lanthanum metaphosphate prepared by the existing method cannot meet the technical index requirements of high-performance phosphate optical glass for additive raw materials, the present invention provides a high-purity optical glass additive lanthanum metaphosphate Preparation

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  • Preparation method of lanthanum metaphosphate as high-purity optical glass additive

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Embodiment 1

[0045] Embodiment 1: the preparation method of high-purity optical glass additive lanthanum metaphosphate:

[0046] Step 1, purifying lanthanum chloride raw material:

[0047] 1.1) Take industrial-grade lanthanum chloride raw material, put it into an enamel reaction kettle, add deionized water, heat and dissolve until the specific gravity is 1.15;

[0048] 1.2) After fully dissolving, when the temperature of the solution drops below 30°C, add a small amount of hydrogen peroxide, stir evenly, add a small amount of lanthanum carbonate, adjust the pH to 3.3, absorb and settle for 6 hours, remove the head and filter into another container Medium, standby; the volume ratio of hydrogen peroxide and lanthanum chloride added in this step is 2:1000; the volume ratio of lanthanum carbonate and lanthanum chloride is 5:1000;

[0049]1.3) Put the lanthanum chloride solution that has been filtered in step 1.2) into an enamel reaction kettle, add deionized water to adjust the specific gravi...

Embodiment 2

[0063] The preparation method of high-purity optical glass additive lanthanum metaphosphate:

[0064] Step 1, purifying lanthanum chloride raw material:

[0065] 1.1) Take industrial-grade lanthanum chloride raw material, put it into an enamel reaction kettle, add deionized water, heat and dissolve until the specific gravity is 1.18;

[0066] 1.2) After fully dissolving, when the temperature of the solution drops below 40°C, add a small amount of hydrogen peroxide, stir evenly, add a small amount of lanthanum carbonate, adjust the pH to 3.5, absorb and settle for 6 hours, remove the head and filter into another container Medium, standby; the volume ratio of hydrogen peroxide and lanthanum chloride added in this step is 1.5:1000; the volume ratio of lanthanum carbonate and lanthanum chloride is 2:1500;

[0067] 1.3) Put the lanthanum chloride solution filtered by step 1.2) into an enamel reaction kettle, add deionized water to adjust the specific gravity of the solution to 1.1...

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Abstract

In order to solve the problem that the purity of lanthanum metaphosphate and the content of metal ions prepared by existing methods cannot meet the technical index requirements on additive raw materials of high-performance phosphate optical glass, the invention provides a preparation method of lanthanum metaphosphate as a high-purity optical glass additive. The preparation method comprises the following steps: 1, purifying lanthanum chloride material; 2, preparing lanthanum hydroxide filter cake; 3, synthesizing lanthanum dihydrogen phosphate; and 4, synthesizing lanthanum metaphosphate. In the invention, roasting is carried out with special temperature gradient to obtain the lanthanum metaphosphate product with purity of 99.95%-99.99%, and the content of metallic impurities such as Fe, Cu, Ni, Cr, Co, Mn, Ti, V and Pb in lanthanum metaphosphate is all less than 1. 5 ppm.

Description

technical field [0001] The present invention relates to a kind of lanthanum metaphosphate (La(PO 3 ) 3 ) preparation method, in particular to a preparation method of lanthanum metaphosphate with high purity ppm level and low metal impurity content for rare earth phosphate optical glass. Background technique [0002] Phosphate optical glass used in high-definition camera equipment, surveillance cameras, high-refraction and low-scattering lenses, the purity of lanthanum metaphosphate added to optical glass and the metal ion elements Fe, Cu, Ni, Cr, Co, Mn, Ti , V, Pb content has very strict requirements. However, the purity of lanthanum metaphosphate prepared by the existing method is generally about 98%, and the metal ion elements Fe, Cu, Ni, Cr, Co, Mn, Ti, V, Pb content are in 80-100ppm, which will affect the optical glass. The performance has a negative impact, and it cannot meet the technical index requirements of phosphate optical glass for additive raw materials. C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/44C03C1/00
CPCC01B25/44C01P2006/80C03C1/00
Inventor 林玉果刘明钢朱建平魏宁黄雪锋杨玉田张福
Owner 莹科新材料股份有限公司
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