An improved process for the purification of phosphogypsum

Phosphogypsum, a by-product of the phosphoric acid industry, is contaminated with the impurities of P 2 O 5 , F, organic matter etc. These impurities impair the strength development of calcined products. For effective and proper utilization, a purification process for phosphogypsum by wet sieving through a 300 micron sieve has been developed. Based on the wet sieving, the laboratory trials were conducted using hydrocyclone. The findings of the purification trials and proposed pilot plant along with a list of uses and applications of the purified material are presented in this paper.