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Vapor pressure filtration combines mechanical and thermal dehydration to increase the dewatering process. Its characteristic is that the vapor condenses in the filter cake to form a very obvious dehydration surface, and the moisture and condensate are discharged from the filter cake until the vapor penetrates the filter cake. Laboratory research results show that the economic effect of the process is obvious. Steam pressure filtered product moisture reaches the low moisture index that can only be obtained by thermal drying. Current research focuses on the conversion of laboratory research results to semi-industrial-scale studies. Establishing a filtration process using steam is not an initial attempt. Applying steam on a vacuum filter improves the dewatering of fine coal and mineral suspensions. All these experiments reduced the moisture content of the product. However, due to specific difficulties in some equipment, these processes have not been successfully applied to practice. Almost all vapor filters manufactured in the early days applied steam after the air was dehydrated, and it was often impossible to fully utilize the steam dewatering surface. In many cases, steam consumption is so large that it cannot be operated economically. As these filters are used, there is no good seal between the steam supply, the distribution system and the filter cake, so that the steam is lost to the working environment, causing serious pollution.
The semi-industrial equipment designed by Bokela GmbH is the first filter operating on the basis of a new steam filtration process and the first application of steam to a pressure filter. The device is equipped with a steam hood, and a special sealing device is used to isolate the steam chamber from other spaces in the pressure tank. The basic principle of steam pressure filtration The steam pressure filtration can be divided into 3 major phases. The formation of the filter cake is the same as the conventional pressure filtration. As the filter cake leaves the slurry, the first stage of mechanical dehydration begins. The filter cake then enters the vapor environment and the vapor condenses on the surface of the cold cake before entering the pores of the filter cake. Due to the condensation of the vapor, the filter cake is heated to the saturated vapor temperature at the working pressure. Foreign metal mines have stably formed mechanical dewatering surfaces.
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