Technology of Kalimagnesia and Potassium Sulfate Based
sylvinite ore with increased carnallite
and sodium sulfate (mirabilite) content.
Sylvinite ores with high carnallite content are not processed today due to the accumulation of magnesium chloride in the circulation solution and the decrease in the solubility of potassium chloride from the ore. The dissolution of sylvinite ore with a high content of carnallite is carried out in a circulating shenite solution, thus obtaining a saturated solution and an undissolved solid residue.
Carnalite impurities in new technology form a reaction medium from which shenite crystallizes, the decomposition of which produces potassium sulfate. Due to the crystallization of shenite in solution, the magnesium chloride concentration increases.
Sodium sulfate (mirabilite) is added to the system at various stages to bind magnesium chloride.
If necessary, excess magnesium is removed from the system in the form of commercial shenite production.
STATE ENTERPRISE “SCIENTIFIC RESEARCH INSTITUTE OF GALURGIYA” SE “NDI GALURGIYA”, Kalush, Ukraine