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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

Inactive Publication Date: 2020-06-30
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] Due to the presence 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.

Method used

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

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preparation example Construction

[0022] Such as figure 1 Shown, the preparation method of the optical grade potassium metaphosphate of technical scheme of the present invention comprises the steps:

[0023] (1) Potassium hydroxide, phosphoric acid and water are reacted in a certain proportion (ie figure 1 The acid-base reaction in), obtain thick potassium dihydrogen phosphate solution;

[0024] (2) adjust the concentration of described crude potassium dihydrogen phosphate solution (ie figure 1 The concentration adjustment step in the process), and pass through the ion exchange resin at a certain flow rate to remove non-ferrous metals and impurity ions;

[0025] (3) Evaporation and concentration to obtain a concentrated solution containing potassium dihydrogen phosphate at a concentration of more than 30%;

[0026] (4) dehydrate the concentrated solution (ie figure 1 In the clean spray calcination step), the removed moisture includes free water and structural water to obtain optical-grade potassium metapho...

Embodiment 1

[0029] The preparation method of the optical grade potassium metaphosphate of the present embodiment specifically comprises the following steps:

[0030] (1) 100kg of industrial potassium hydroxide with a content of 97% is added to dilute phosphoric acid blended with 202.9kg of 85% industrial phosphoric acid and 487.1kg of water, and the reaction temperature is controlled at 87°C to 91°C to obtain crude dihydrogen phosphate Potassium solution;

[0031] (2) adjust the thick potassium dihydrogen phosphate solution concentration to 12%, pass through a group of cation exchange resin and anion exchange resin with the flow velocity of 3.5L / min, the cation exchange resin that the embodiment of the present invention adopts is 001 * 7, 732 type cations Exchange resin, the anion exchange resin is D202 type anion exchange resin to remove Fe, Mn, Pb, Cr, Cu, Ni, Co and other non-ferrous metals and Cl － , sulfate and other impurities;

[0032] (3) Concentrate by evaporation to obtain a c...

Embodiment 2

[0035] The preparation method of the optical grade potassium metaphosphate of the present embodiment specifically comprises the following steps:

[0036] (1) 120kg of industrial potassium hydroxide with a content of 97% is added to dilute phosphoric acid blended with 244.7kg of 85% industrial phosphoric acid and 587.3kg of water, and the reaction temperature is controlled at 85°C to 89°C to obtain crude dihydrogen phosphate Potassium solution;

[0037] (2) adjust the thick potassium dihydrogen phosphate solution concentration to 11%, pass through a group of cation exchange resin and anion exchange resin with the flow velocity of 4L / min, the cation exchange resin that the embodiment of the present invention adopts is 741 type, D001 type cation exchange resin , the anion exchange resin is D202 type, D406 type anion exchange resin to remove Fe, Mn, Pb, Cr, Cu, Ni, Co and other non-ferrous metals and Cl － , sulfate and other impurities;

[0038] (3) Concentrate by evaporation to...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/445C03C1/00
CPCC01B25/445C01P2006/80C01P2006/82C03C1/00
Inventor 蒋加富
Owner 上海太洋科技有限公司
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