There is abundant of brine with lithium in our country. Lithium, which is of very important value of exploitation, is mainly contained in the brine of plateau-salt lakes and underground brine. With the advantages of low cost of exploitation and little investment of projects, extracting lithium from liquid lithium-mine directly is thought to be an optimal and economic technical path, is adequate for making use of the dispersive and low-content resource of brine-contained lithium of our country. Because of th...