USE OF POLYMERS FOR THE MODIFICATION OF GYPSUM CRYSTALS IN THE WET PROCESS PHOSPHORIC ACID PRODUCTION

摘要

of the Invention A wet process production of phosphoric acid in which phosphate rock is digested, whereby phosphoric acid is released and calcium sulfate crystals are formed, employs a polymeric crystal modifier in the digestion stage of the process to improve the separation of the raw phosphoric acid product from the calcium sulfate crystals and to increase the concentration of phosphoric acid in the raw phosphoric acid product.