Innovation of traditional series of combination process for alumina production

When the Bayer process is applied to the middle/low grade bauxite with A/S <5, the production flow is simple and energy consumption is low, but the yield rate and resource availability are low as well. However if a series of combination process is used a high yield rate can be high, but the energy consumption is also high and Bayer process system is affected. In this paper an innovative series combination process to minimize the energy consumption, and to reduce the negative effects caused to Bayer process system is proposed for optimal production of alumina from middle/low grade bauxite with SiO2 mainly existing in the form of kaolinite.