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Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals
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Abstract
An improved method for producing hydrogen fluoride from fluoride bearing ores, such as fluorospar and fluorapatite, by reacting of the ore as a slurry in fluorosulfonic acid, the slurry is heated by the exothermic heat of the reaction to vaporize volatile phosphorous compounds and substantial quantities of hydrogen fluoride, the calcium fluoride is substantially reacted to form hydrogen fluoride, high silica fluorospar ores can be used since silicon tetrafluoride is not formed with fluorosulfonic acid, another feature provides for addition of calcium fluoride to the slurry to react with the by- product sul-furic acid in the residual solids to eliminate the sulfuric acid recovery step in the process, hydrogen fluoride produced is re-covered , together with the hydrogen fluoride produced from the hydrolysis, or pyrolysis of the intermediate fluorphosphorous compounds, additionally at least a portion of the hydrogen fluoride can be reacted with sulfur trioxide to form fluorosulfonic acid fro makeup in the process
JO19811146A1981-03-301981-03-30Process for producing hydrogen fluoride
JO1146B1
(en)
Method for preparing elemental sulfur as a diffusion-resistant gas and methods for its use in making lime, sulfur dioxide and sulfuric acid from waste gypsum