Abstract
An improved lime-sintering process was developed to produce alumina from low-grade diasporic bauxite in this paper. Both clinkers sintered by the real bauxite and simulated bauxite at 1350 °C when the molar ratio of CaO to Al2O3decreased to 1.4 were produced, the alumina leaching rates of which reached over 90% in sodium carbonate liquor. The main phases in the clinkers after sintering are 12CaO•7Al2O3, γ-2CaO•SiO2and 2CaO•Fe2O3. Addition of alkali can decrease the C/A ratio and get a high alumina leaching rate of clinker.
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