Study on a New Method of Clean Production of Alumina by Calcification Transformation

The Bayer processBayer process technologyProcess technology is widely used for the industrial production of aluminaAlumina, however, it is significantly impacted by two important defectsDefects: firstly, when using low-grade ore for production of aluminaAlumina the economics become very challenging, and secondly, the discharge of large volumes of alkaline red mudRed mud (bauxite residueBauxite residue) to the environment is highly undesirable. Based on the idea of redesigning the extraction phase of the process, a new methodMethod of producing aluminaAlumina by calcification transformation is proposed in this paper. The characteristics, advantages and disadvantages and economy of calcified carbonizationCalcified carbonization, calcified biomassCalcified biomass, calcified potassium alkaliCalcified potassium alkali and chlorinated alkali solutionChlorinated alkali solution are compared and analyzed. The feasibility of various calcified transformation red mudsRed mud are compared, and the progress of laboratory and industrial research on calcification transformation methodsMethod are analyzed comprehensively.