In Greek the word “halurgy” means salt business. The halurgical method was first used for the production of potassium chloride in the town of Stassfurt (Germany) in 1862. It is based on the different solubility of KCl and NaCl in water at elevated temperatures. The method is used for treatment of sylvinite ores, for solutions obtained by underground dissolution and for natural reservoirs with high mineral content. At normal temperatures the solubility of potassium and sodium chlorides is almost the same. As temperatures increase, the solubility of sodium chloride is almost unchanged, while the solubility of potassium chloride increases dramatically.
of halurgical
SPECIFICS OF APPLICATION OF THE HALURGICAL METHOD FOR TREATMENT OF NATURAL BRINES Prior to treatment, low-concentrated natural solutions are evaporated under the influence of solar energy resulting in the appearance of artificial carnallite crystals.
SPECIFICS OF APPLICATION OF THE HALURGICAL METHOD FOR SOLUTIONS OBTAINED BY THE UNDERGROUND DISSOLUTION METHOD The original potassium-containing solution is obtained not at a plant on the surface but during the direct dissolution of salt beds. Two enterprises in Canada use this technique.
30% KCl
White MOP 95% KCl or 98% KCl
as required
Tailing Debrining
Slimes Thickener
Brine Clarification
Dumping and Mine Backfilling
Leach with Brine
Brine Clarification
Crystalisation cooling to 35o
Product debrining