ENHANCED PROCESS TO PRODUCE A THERMOFERTILISER FROM POTASSIUM-BEARING MINERALS

摘要

The present invention proposes a simplified and enhanced process route to produce thermofertiliser obtained from potassium and phosphorous-bearing minerals where these elements can be or not in the citric acid or water insoluble forms. The process described also comprises the use of specific additives, at the beginning of the process or immediately before the beginning of the thermal treatment step, in order to increase the potassium and phosphorous contents in the product and the overall efficiency of the process and also to promote the production of a high quality thermofertiliser.