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Process TechnologyShowroomNewsBHS finalizes three cyclic indexing belt filters for fluorosilicic acid
BHS finalizes three cyclic indexing belt filters for fluorosilicic acid
March 25, 2025
We cross the production hall with the drone and get an impressive view of the three BHS cyclic belt filters
BHS has completed the production of three large cyclic indexing belt filters intended for the processing of fluorosilicic acid. Fluorosilicic acid is a by-product of the processing of fluorapatite with sulphuric acid during the production of phosphoric acid.
Each of the machines actively measures 2 meters in width and 14 meters in length. During operation, the solids are first separated from the suspension as a filter cake and then washed three times in countercurrent to minimize the acid content. The aim is to achieve a residual acid content of less than 1 % in the filter cake.
The suspension is distributed evenly across the width of the machine to ensure a consistent and homogeneous filter cake, which enables effective washing. The filter cake thickness and the washing sequences are determined by tests during the project planning phase, whereby a thin filter cake is advantageous for high filtration performance and optimum displacement washing. The suspension is fed and the filter cake discharged continuously. The arrangement of the three washing stations can be flexibly adapted to the product.
Due to the corrosive and highly acidic atmosphere, the filter is made entirely of plastic in all areas in contact with the product. Components where this is not possible are made of Hastelloy. The filters are designed for outdoor installation and must therefore withstand large temperature differences. “Our plastic cyclic indexing belt filters have already proven themselves in many applications. Temperature changes in corrosive and harsh industrial environments, often combined with outdoor installation, are always a challenge. Experience is reflected in the design details that ensure safe and durable operation,” concludes Volker Spies, Vice President Sales of the Process Technology business unit.
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