| 摘要 |
FIELD: inorganic chemistry, chemical technology. SUBSTANCE: invention relates to technology for preparing sodium silicofluoride from fluosilicic acid solutions formed at the stage of an aqueous absorption of gases in producing hydrogen fluoride and phosphoric acid containing SiF4 and HF. Invention is directed to the preparing easily filtering sodium silicofluoride of the high quality. Sodium silicofluoride is prepared by interaction of fluosilicic acid and sodium hydroxide in the mole ratio of fluorine to silicon = 6: 1 and by changing pH up to a single value in the range 5.0-6.5. EFFECT: improved preparing method. 2 cl, 1 tbl, 4 ex |
