METHODS FOR PREVENTION OF SURFACE WATER CONTAMINATION AND AIR POLLUTION BY FLUORINE COMPOUNDS FROM PHOSPHATE PLANTS

摘要

Processes for eliminating fluorine contamination of surface waters, and other pollution, by fluorine compounds from phosphate plants, and for recovery of fluorine as hydrofluosilicic acid. The processes involve the separation of fluorine compounds from waste gases by absorption-desorption with NaF, BaF2, or KF, and absorption of SiF4 in water. HF may also be recovered.