SU237832A1 - METHOD OF OBTAINING HYDROGEN FLUORINE - Google Patents

Description

A known method of producing hydrogen fluoride from fluorine-containing gases released during the process of sulfuric acid decomposition of fluorspar by absorbing them with an aqueous solution of am.mia to completely neutralize the solution. After absorption, ammonia is reintroduced and the resulting solution of ammonium fluoride and silicon dioxide is filtered. Since silicon dioxide contains fluoride, it is sent to the dump.

The filtered solution is evaporated until the ylut of ammonium fluoride-bifluoride ammonium is evaporated and treated with an excess of sulfuric acid (200-230%) at 160 ° C with the release of hydrogen fluoride and ammonium bisulfate. The degree of extraction of hydrogen fluoride is 75%.

In order to improve the degree of hydrogen fluoride recovery and to obtain high-quality silicon dioxide (Quality is offered as an ammonium solution; you can use ammonium fluoride pacTBQp ammonium, and neutralize ammonium silica with a solution of ammonia at a temperature of 0; 80 ° C. Then filter the solution by 2% ammonium fluoride at 2; washed with water and 1P1 diluted the washings with the absorption of a chain of silica fluoride, and the filtrate was evaporated to form an ammonium fluoride bifluoride melt. Decomposition of the mixture with sulfuric acid

It is proposed to conduct an IR, and a temperature of about 190 ° C with a stoichiometric amount of sulfuric acid.

PRI me R. Fluoric fluoride gases, porridge, and 137 kg of SiP absorb 6% solution of 1625 kg of ammonium fluoride.

The resulting solution of silicofluoride amlyium in the amount of 986 kg with a content of 203.3 kg (NI-Lj) 2SiF4 and 10.5 kg of SiO neutralizes 311 kg with a 25% -: ammonia solution at a temperature and filtered.

79 kg of silica are obtained, which are treated with water at a temperature T: W of 1: 40 and sunlat, and 902.7 kg of a 20% ammonium fluoride solution, which is directed to evaporation. After evaporation, 30.9 kg of ammonia are obtained in the form of 6% ammonia water and 159.1 kg of a mixture of ammonium bifluoride fluoride, which is treated with 392 kg of 97% sulfuric acid at 190 ° C and 103 kg of 97% fluoride are obtained. hydrogen and 358 kg of ammonium bisulfate.

Subject invention

The method of producing hydrogen fluoride, silicon dioxide, and ammonium bisulfate by absorbing fluorine-containing gases with ammonium-containing solution, followed by treating the solution with ammonia, filtering it, evaporating ammonium fluoride, ammonium fluoride, processing the resulting water with sulfuric acid, in order to get of high quality silicon and increase in the degree of extraction of fluorine-rich water of the genus; ammonium fluoride solution and treatment of fluorofluoride solution are used as ammonium-containing solution5 of ammonium is carried out with ammonia at a temperature of about 80 ° C, followed .razlozheniem obtained melt ammonium bifluoride-fluoride stoichiometrically necessary amount of sulfuric acid at a temperature of about 190 ° C.