Lemica concentrate in Yichun area of Jiangxi province is widely used belt filter for dehydration, belt filter not only covers a large area of equipment, but also low dehydration efficiency, filtered lemica concentrate high water, generally greater than 18%, lemica concentrate high water directly leads to transportation costs and downstream lithium carbonate plant drying costs high. In order to solve this problem, a concentrator in Yichun area used FFP horizontal fast-opening filter press produced by a certain manufacturer to dehydrate leucite concentrate. The effects of FFP horizontal fast-opening filter press filter cloth type, cycle time, working pressure, filter aid type and dosage of leucite concentrate on the water content of leucite concentrate were investigated. The test results show that when the FFP horizontal fast opening filter press uses nylon monofilm filter cloth with air permeability of 300L/㎡/min, cycle time of 930s, working pressure of 11.0bar, and the filter aid uses polyaluminum chloride 450g/t, the water content of lemica concentrate is 13.80%, which is obviously lower than that of other concentrator in Yicchun area. Filter aid polyaluminum chloride is conducive to reducing water, this is because the molecular chain of polyaluminum chloride is fixed on the surface of different fine particles or very fine particles, and the bridge between the fine particles or very fine particles forms a polymer aggregate, and the aggregate will not cause the filter hole blockage of the filter cloth during the filtration process. Compared with the belt filter, the FFP horizontal fast-opening filter used by a concentrator in Yichun area has the characteristics of small equipment area, high dehydration efficiency and high degree of automation, which solves the industry problem of high water content of leucite concentrate in Yichun area. It is the first large-scale successful application in the leucite mineral processing industry, and has a very important demonstration significance in the industry. The future application prospect is broad.