Recovery of Hydrofluoric Acid from Waste Fluosilic Acid: Preliminary Studies

摘要

Preliminary studies showed that direct hydrolysis of H2SiF6 to SiO2 and HF at elevated temperatures was subject to many mechanical difficulties, and that corrosion of construction materials was a serious problem. Elimination of SiO2 from the HF product was generally poor. An alternative procedure, hydrolysis of lime-neutralized H2SiF6 by steam at 950 to 1,100C, yielded a product very low in SiO1. Condensates containing up to 300 g/1 HF were prepared. (Author)