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MEI Online: Solid-Liquid Separation: Latest News: July 12th 2002


Click for more info on Process Mineralogy '20

:: Improvement of Filter Performance Enables Capacity Increase Without New Equipment  

The 3-step filter optimisation program of BOKELA enables customers to increase the performance and profitability of solid/liquid separation plants such as disc, drum and belt filters, candle filters, filter presses or sieve belt presses. The feasibility of this filter revamping program is backed up by numerous filter optimisation projects of BOKELA in many industries like in the alumina, chemical, pharmaceutical, pigment and other industries. Two current projects for clients in the mining industry show again the convincing benefits of this economic alternative to new investments.

At the filtration of a fine particle product (x50 < 3 m) on fourteen (14) drum filters of 40 m filter area each the BOKELA filter optimisation program effected a throughput increase of 40-50%. The on-site tests revealed the major weak-points of the running filters and showed a considerable potential for improving the operation behaviour and the filter performance. The revamping measures proposed by BOKELA included modifications to the control valve, to the filtrate piping, to the filter cloth fixing, to the cake washing and cake discharge system and to the control philosophy of the filter. After these modifications, which were first carried out at one drum filter, the modified filter shows now an guaranteed increase of the solids throughput of 40-50%, a 20% reduced soluble soda content of the filter cake and an increase of the plant performance of 75%.

A second example of the BOKELA filter optimisation program from a client in India shows a different way for an economic filter upgrade. BOKELA suggested to the client to rebuild two out of work drum filters with 125 m filter area each from another plant instead of investing in new filter equipment. BOKELA took over all kind of engineering work on a lump sum basis such like the dismounting, modification and rebuilding, transport and commissioning of both drum filters. The total costs for these measures came to some 30% compared to the investment costs for new drum filters which means cost savings of 70%.




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