Novel Purification Technology of Carnallite and Potassium Chloride Product by Preprocessing-reverse Flotation in Reverse Flotation-cold Crystallization Production of KCI

摘要

The purification process of water-mining carnallite and rough potassium chloride concentrate from Qinghai Salt Lake Industry Group Co. Ltd. are investigated by the preprocessing-reverse flotation technology respectively.The results show that the impurities such as calcium sulfate and sodium chloride can be effectively removed from water-mining carnallite ore and rough potassium chloride concentrate by the new technology, the low-sodium carnallite is obtained and the final potassium chloride product greatly upgraded. The content and the recovery of KCI in the low-sodium carnallite are 25.78% and 97.50%, meanwhile the content of NaCI, CaSO4 in the low-sodium carnallite are 0.56% and 0.24%,and the removal of sodium chloride and calcium sulfate in the low-sodium carnallite are 97.48%,85.10% respectively. The KCI content and recovery of high quality potassium chloride product are 98.25%, 96.70%, and CaSO4 content is 0.40% with 83.24% calcium sulfate removed in the high quality potassium chloride product.