Utilization of sugar processing filter cake instead of calcite in production of anorthite based ceramics
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In recent years, the reuse of industrially generated residues in ceramic bodies has been an important issue. Reuse of industrialwaste products is not only environmental responsibility, but also cost reduction and efficient use of raw materials. The aim ofthe study was to investigate the possibility of using press filter cake (PFC) instead of calcite in the production of anorthitebasedceramics. The PFC is an industrial solid waste, which is a by-product in the production of sugar from sugar beet. Thissolid waste quantity is about one million ton per year in Turkey. PFC was evaluated as alternative raw material in thepreparation of anorthite based ceramic bodies. In this study, anorthite based ceramics were produced by using two differenttypes of calcium oxide source. While PFC and calcite were used as CaO source, clay was used as the source of aluminumsilicate. Compositions were prepared from 30% calcium oxide sources and 70% clay by weight. The ceramic bodies weresintered at different temperatures from 1000 oC to 1200 oC. The micro-porous structure of ceramics were obtained by burningof organic substances and by decomposing of carbonate compounds of the PFC wastes during firing process. The differencesbetween the physical, mechanical and microstructural properties of anorthite based ceramics produced from two differentCaO sources were investigated. Also, their phase analysis results were compared. While the specimens with 30 wt% PFCaddition fired at 1200 oC contained anorthite (CaO·Al2O3·2SiO2) and cristobalite (SiO2) as major phase, the specimens with30wt% calcite addition fired at same temperature included anorthite as major phase and minor secondary phases such ascristobalite and quartz.
Abstract
In recent years, the reuse of industrially generated residues in ceramic bodies has been an important issue. Reuse of industrialwaste products is not only environmental responsibility, but also cost reduction and efficient use of raw materials. The aim ofthe study was to investigate the possibility of using press filter cake (PFC) instead of calcite in the production of anorthitebasedceramics. The PFC is an industrial solid waste, which is a by-product in the production of sugar from sugar beet. Thissolid waste quantity is about one million ton per year in Turkey. PFC was evaluated as alternative raw material in thepreparation of anorthite based ceramic bodies. In this study, anorthite based ceramics were produced by using two differenttypes of calcium oxide source. While PFC and calcite were used as CaO source, clay was used as the source of aluminumsilicate. Compositions were prepared from 30% calcium oxide sources and 70% clay by weight. The ceramic bodies weresintered at different temperatures from 1000 oC to 1200 oC. The micro-porous structure of ceramics were obtained by burningof organic substances and by decomposing of carbonate compounds of the PFC wastes during firing process. The differencesbetween the physical, mechanical and microstructural properties of anorthite based ceramics produced from two differentCaO sources were investigated. Also, their phase analysis results were compared. While the specimens with 30 wt% PFCaddition fired at 1200 oC contained anorthite (CaO·Al2O3·2SiO2) and cristobalite (SiO2) as major phase, the specimens with30wt% calcite addition fired at same temperature included anorthite as major phase and minor secondary phases such ascristobalite and quartz.
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