High purity metaphosphate and method for production thereof

A technology for metaphosphates and manufacturing methods, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as difficult molar ratio control, detailed manufacturing methods, and no records of impurities and no impurity content.
CN1761616AActive Publication Date: 2006-04-19NIPPON CHECMICAL IND CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NIPPON CHECMICAL IND CO LTD
Publication Date
2006-04-19

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Abstract

A high purity metaphosphate, characterized in that it contains each coloring metal element in an amount of 5 ppm or less. Metaphosphates include an aluminum salt, a barium salt, a calcium salt, a magnesium salt and a strontium salt. Aluminum metaphosphate is suitably produced by a method comprising a first step of reacting an aluminum compound with phosphoric acid with heating to prepare a fluidized reaction mixture comprising aluminum biphosphate, a second step of spreading an aluminum metaphosphate powder in a vessel for firing, adding the fluidized reaction mixture comprising aluminum biphosphate from the first step on the powder and then firing them, and a third step of pulverizing the fired product from the second step.
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Description

technical field

[0001] The present invention relates to high-purity metaphosphate and its production method. Background technique

[0002] Now, as environmental problems in the field of electronic materials are becoming more and more serious, lead-free is currently being pursued. In the glass industry, the lead-free process is also being promoted, and the development of high-refractive lenses and low-melting glass is being developed to replace leaded glass. Non-ferrous metals, especially iron, cannot be mixed into this high refraction lens. Phosphate-based glasses, bismuth-based glasses, borosilicate-based glasses, and the like are attracting attention as materials expected to be used as raw materials for high-refractive lenses. Among them, it is considered that metaphosphate is effective as a phosphate-based glass raw material because the average phosphorus content per unit weight is high.

[0003] Typical metaphosphates used as phosphate-based glass raw materials includ...

Claims

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