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Lithium metaphosphorate production process

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

Inactive Publication Date: 2007-12-19
SHANXI SUPERNEW METAL MATERIAL
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Problems solved by technology

[0009] The purpose of the present invention is to provide a production process of lithium metaphosphate, which solves the technical problems of complex production process, high production cost and unstable product quality in the background art

Method used

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  • Lithium metaphosphorate production process

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Embodiment Construction

[0029] Production technology principle of the present invention is as follows:

[0030] 1. The refining of lithium hydroxide. Industrial lithium hydroxide contains impurities such as chlorides, acid salts, phosphates, silicates, etc., taking advantage of the low solubility of these impurities in cold water, the method of cold dissolution can be used to filter out impurities.

[0031] 2. Neutralize the refined lithium hydroxide and phosphoric acid to generate lithium dihydrogen phosphate. The chemical reaction formula is as follows:

[0032] LiOH+H 3 PO 4 →LiH 2 PO 4 +H 2 o

[0033] 3. In the presence of a small amount of excess phosphoric acid, water-soluble lithium dihydrogen phosphate is condensed into lithium metaphosphate through high-pressure centrifugal spray drying. The chemical reaction formula is as follows:

[0034]

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

[0036] 1. Take industrial lithium hydroxide or refined l...

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Abstract

The invention discloses a manufacturing technology of lithium metaphosphate, which comprises the following steps: placing the raw material of industrial lithium hydroxide or fine lithium hydroxide in the reaction container; adding the deionized water and active carbon; stirring evenly; adding the deionized water to dilute the solution at 1.05-1.10 specific gravity; stewing; filtering the solution in another container to obtain heavy fine lithium hydroxide solution; adding phosphate slowly until the pH value is 2.8-3; stirring; obtaining the lithium phosphate solution; adding active carbon and precipitant to remove impurity; adding the deionized water until the specific gravity is 1.05-1.10; heating; stewing; filtering the solution in another container to obtain the concentrated lithium phosphate solution; 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 lithium metaphosphate, in particular to a production process of lithium metaphosphate with low metal impurity content for special optical protective glass, and the main impurities iron, copper, nickel, manganese and cobalt are respectively less than 0.0003% . Background technique [0002] At present, the production of lithium metaphosphate mainly adopts the reaction of lithium phosphate and hydrochloric acid to generate lithium dihydrogen phosphate, which is then calcined at high temperature. The main drawbacks of this method are: [0003] 1. The production process is complicated. [0004] 2. Production costs and equipment maintenance costs are high. [0005] 3. The drying process has low thermal efficiency and high energy consumption. The thermal efficiency of the drying process is only about 26%. [0006] 4. The product has high impurity content, and the product quality fails to meet the quality r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/445
Inventor 邱志明邱雯刘明钢
Owner SHANXI SUPERNEW METAL MATERIAL
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