Preparation method of optical-grade potassium metaphosphate

An optical-grade potassium metaphosphate technology, which is applied in the field of preparation of optical-grade potassium metaphosphate, can solve problems affecting the optical properties of glass and achieve strong adaptability
CN111348635AInactive Publication Date: 2020-06-30上海太洋科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
上海太洋科技有限公司
Publication Date
2020-06-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

The technical scheme of the invention discloses a preparation method of optical-grade potassium metaphosphate, wherein the preparation method comprises the following steps: (1) carrying out a reactionof potassium hydroxide, phosphoric acid and water according to a certain proportion to obtain a crude potassium dihydrogen phosphate solution; (2) adjusting the concentration of the crude potassium dihydrogen phosphate solution, and enabling the crude potassium dihydrogen phosphate solution to pass through ion exchange resin at a certain flow rate to remove non-ferrous metals and impurity ions; (3) evaporating and concentrating to obtain a concentrated solution containing 30% or more of monopotassium phosphate; and (4) dehydrating the concentrated solution to obtain the optical-grade potassium metaphosphate finished product, wherein the removed moisture comprises free water and structural water. According to the technical scheme, the preparation method is high in adaptability to potassiumhydroxide serving as a raw material, the crude potassium dihydrogen phosphate reaction solution is purified by adopting an ion exchange method, high-purity potassium metaphosphate powder can be prepared in combination with a clean spray calcination mode, and various indexes meet the requirements of optical glass and laser glass raw materials.
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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 potassium 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.

[0003] 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. Ther...

Claims

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