Dressing's methods in Belaruskaliy

  Method of floatation.
Sylvinite dressing by means of floatation method is running in saturated salt solutions. This method is based on a selective water-repellency treatment of the surface of potash minerals by the collector agents. This establish conditions under which the particles of the mineral get fixed to the air bubbles so that it is possible to extract them as a foaming product. Floatation method of dressing also includes operations for preparation of mineral grain size (grinding and classification) and separation of the clay and carbonate slimes (slime removal). The final concentrate with the KCl content of 95,3-96,2% will be dehydrated and dried. Tailings of the floatation with the KCl content of 2,5-3,0% after dehydration will be transported to the waste storage. Slime product after thickening and liquor clarification will be transported to the slime storage. Extraction of the disposable component while using floatation method of processing makes out 84-85%.

   Hot-leaching method.
This method of dressing of the raw material, which contains potash, is based on dissolving the potassium chloride from the ore by the hot solution at the temperature of 120°C followed by the separate crystallization of the salt components of the processed ore.
 Technology of the hot-leaching method consists of crushing the sylvinite ore, dissolving the sylvinite by the hot liquor in dissolving tanks with screw mixers and bucket elevators, cooling (in order to achieve crystallization of the potassium chloride from the clarified saturated solution) and thickening in settling basins. After that the thickened suspension will be sent to the centrifuges. Drying of the filtrated potassium chloride is made on the drying drums and fluidized bed furnaces.Potassium chloride content in the concentrate makes out 95-98% and in halite waste 2,5-3,0%, extraction makes out 86,5-87,5%.

from