Study on cold decomposition crystallization process of underground primary high-sodium carnallite ore
In order to improve the particle size of KCl products,the effects of factors such as the concentration of MgCl2 in the decomposition solution,the crystallization residence time,the stirring rate,the feed size,and the fine crystal treatment method on the particle size,grade,and recovery of KCl products prepared by cold decomposition crystallization of under-ground primary high-sodium carnallite ore were studied,and the optimized process conditions were obtained.The results showed that the concentration of decomposition medium MgCl2,crystallization residence time and stirring rate were the most sensitive to the influence of KCl crystal size.The effect of feed size on KCl crystal size was not significant.After the fine crys-tals were dissolved,they could return to the crystallizer and participate in crystallization again to obtain larger KCl products.The optimized process conditions were as follows:decomposition medium MgCl2 concentration of 17%,residence time of 2 h,stirring rate of 800 r/min,feed size of raw ore of 1～<4 mm,fine crystal precipitation mixed with decomposition solu-tion and returned to crystallizer.Under the optimized process conditions,good test indexes such as decomposition crystalliza-tion KCl recovery rate of 84.70%,flotation concentrate KCl grade of 90.50%,and KCl product average particle size of 0.264 mm were obtained.
KClcarnallitecold decomposition crystallizationfeed sizecrystallization time
NETL
NSTL
万方数据
维普
