The utilization of phosphogypsum (PG) as a raw material for the production of valuable products is interesting. In this
regard, the full factorial design has been performed to improve the conversion process of phosphogypsum to calcium
carbonate using sodium carbonate. Four factors were taken into consideration in the experimental planning: time, solid/ liquid
ratio, sodium carbonate concentration, and temperature. The analysis of variance (ANOVA) has been used to determine the
main effects and interactions between the studied factors. The optimum conditions have been determined as, sodium
carbonate concentration of 30 %, reaction time of 10 min and solid/ liquid ratio, g/ ml of 1:2. Under these optimum
conditions, the phosphogypsum conversion to carbonate efficiency performance is 95.2 %.