The mine adopted Changjie CJXA highly efficient filter press to filter and wash lithium chloride at the same time. After the filtration and washing, the moisture content in the filter cake was reduced to under 18%, and the lithium slag generated were much less than the previous generated by the process of filtration-mixing-filtration, meanwhile, the process requires less water. After adopting Changjie CJXA filer, the drying process saved and production cost been reduced greatly.