METHOD OF OBTAINING SODIUM SILICON FLUORIDE Russian patent published in 2009 - IPC C10B33/10

Abstract RU 2356933 C2

FIELD: chemistry.

SUBSTANCE: present invention relates to chemical industry. Fluorine-containing gases from wet-process production of phosphoric acid and fertiliser are absorbed in water. The obtained silicon hydrofluoric acid is neutralised with soda in the presence of sodium bicarbonate at pH 0.2-3 for a period of 0.25-1 hour. Mass ratio soda:sodium bicarbonate equals 1:1 - 4.

EFFECT: increased rate of settling sodium silicon fluoride crystals to 8 - 10 m/h due to increase in percentage of crystals with size of 60-70 mcm to 80-85%.

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RU 2 356 933 C2

Authors

Mustafin Akhat Gaziz'Janovich

Sharipov Tagir Vil'Danovich

Dates

2009-05-27—Published

2007-06-05—Filed