METHOD OF PROCESSING HYDROSILICOFLUORIC ACID PRODUCED DURING THE WET DECOMPOSITION OF PHOSPHATES, AND ARRANGEMENT FOR CARRYING OUT THIS METHOD

摘要

1. A method of processing hydrosilicofluoric acid resulting during the wet decomposition of phosphates, by treating silicofluoride-containing washings with fine-particle CaCO3 , characterized in that washings with a content of silicofluorides of at least 20% by mass, preferably between 24 and 30%, calculated as H2 SiF6 , are reacted, with CaCO3 to SiF6 **2 (cation) ions at a molar ratio of from 3.3 : 1 to 5 : 1, preferably 3.9 : 1, being used and the paste-like reaction mixture obtained is allowed to solidify into a solid consistency.