The operation test of lime cake with 20ram thickness showed that water content could be reduced to 1% at less than 100 C and 4kPa under pressure, and the traditional vacuum dryer needed about 4H. Hot water circulates between the frames, heating the metal frame and drying the cake. The heat transfer rate of metal plate is about 4 times higher than that made of PP. At present, the capacity of the filter can reach 1 ~ 5kt / a level, which is suitable for the fine chemical industry and the pharmaceutical industry. Because the new design structure can carry out bilateral filtering, thus reducing the filtering time. Filtech, in Wiesbaden, Germany, has launched a heated plate filter developed by the Bayer technology service company and the Strasbourg filter company, which can also be converted into a traditional filter filter that combines filtering and drying in a single unit, thereby greatly reducing the filtration process. Time and investment cost. The filtration system is made up of a membrane filter plate sandwiched between metal plates and frames. In addition, the cleaning of the wing filter press of the suspension or filter fluid can also be combined on the downstream side of the filter process, which is not possible for the traditional plate filter press.