Methods for graded utilization of fluorine and silicon resources in phosphate ores

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United States of America Patent

PATENT NO 11891344
APP PUB NO 20230339822A1
SERIAL NO

18296356

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Abstract

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The present disclosure discloses a method for graded utilization of fluorine and silicon resources in a phosphate ore. While the phosphate ore reacts with sulfuric acid, a fluorine-containing and silicon-containing tail gas is produced. SiO2 and H2SiF6 solution with a high concentration are obtained by concentrating and filtering a solution containing HF and H2SiF6 formed after tail gas is absorbed by water. Crude SiF4 and a solution containing HF and H2SO4 are obtained by extracting, adsorbing, and dehydrating the H2SiF6 solution. SiF4 with a 5N purity is obtained after the crude SiF4 is adsorbed and distilled, at the same time, an impurity-enriched SiF4 is returned to operations of concentration and filtration to react with the solution containing HF and H2SiF6 to generate the H2SiF6 and SiO2. High-purity HF and waste sulfuric acid are obtained after the H2SO4 solution containing HF is separated by steam stripping and distillation.

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Patent Owner(s)

Patent OwnerAddress
CHTEM LIMITEDROOM 922 F2-1 BUILDING FUTURE ARK YUNYAN DISTRICT GUIYANG

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Quan, Xiaowei Guiyang, CN 1 0

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