The reliable separation of interfering coarse particles from dispersions or absolute filtrate clarity is of great importance in many processes. Dynamic filtration and screening with the BoCross filter enables efficient solutions for both classification and clear filtration tasks where state-of-the-art processes such as wedge wire screens, cartridge and backwash filters, vibrating screens, centrifuges, cyclones or membrane filtration reach their limits.

In particular, the sieving of suspensions with a high particle concentration is not possible or not recommendable with the above-mentioned devices, or at least the suspension must be diluted before sieving. Depending on the task at hand, the Bo-Cross filter can be used to implement various processes tailored to the product and objective. Accordingly, a base layer on the separation medium can be reliably prevented or deliberately adjusted. The article explains the possible operating modes with a focus on screen filtration for separating unwanted coarse particles from highly concentrated suspensions. The aim is to achieve a continuous filtrate throughput with a high concentration of fine particles that is still capable of flowing.

Options are explained using two application examples: It is shown how the BoCross filter is used to continuously sieve off interfering coarse particles from a highly concentrated, viscous dispersion with a defined separation cut in a tightly sealed apparatus. The proportion of coarse material retained in the retentate is very low in relation to the filtrate throughput. Another example shows the separation of interfering mineral particles. The materials used here are used for coating electrodes. Even one particle protruding from the coating can lead to production rejects and must therefore be reliably removed.