Sintered filter materials with controlled porosity for water purification prepared from mixtures with optimal ratio of zeolite, bentonite, kaolinite, and charcoal

Abstract Water filter materials were prepared from the mixtures of zeolite, bentonite, kaolinite, and charcoal powder, fired to temperatures from 1000 to 1100 °C. The effects of charcoal powder and firing temperature on porosity of filter materials were studied. The results show that the filter materials prepared at 1000 °C, from the mixtures of 85.00 mass% zeolite, 8.00 mass% bentonite, 6.00–6.50 mass% kaolinite, and 0.50–1.00 mass% charcoal powder, have a uniform pore size of 0.3 μm. The main components of the filter materials are heulandites, mordenite, cristobalite, montmorillonite, mullite, and hematite.