THERMODYNAMIC ANALYSIS OF ENRICHMENT OF LOW-GRADE PHOSPHATE RAW MATERIALS WITH ORGANIC ACID

https://doi.org/10.48498/minmag.2023.2017.5.005

The phosphorus industry faces the challenge of developing low-grade phosphate reserves for industrial purposes, requiring technological solutions for enrichment. About 20 million tons of low-grade phosphorites are currently unsuitable for processing. Depleting phosphorite deposits and low phosphorus anhydride levels reduce global demand for domestic ore and necessitate research on enrichment and integrated use. This study aims to conduct a thermodynamic analysis of low-grade phosphate enrichment using acetic acid. Using the HSC Chemistry 9.3 program, developed by Finnish metallurgical company Outokompu, the thermodynamic interactions of phosphate compounds and acetic acid were analyzed. It reveals that the reactions of phosphate raw materials with acetic acid are thermodynamically feasible, except for fluorapatite, iron (III) oxide, and silicon dioxide. Carbonate, aluminum-, and potassium-containing compounds in low-grade phosphate materials show the highest likelihood of interaction with acetic acid.

*Y.B. Raiymbekov, P.A. Abdurazova, U.B. Nazarbek