Sustainable Mining and Metallurgy

This paper introduced the harm and influence of high sulfur minerals and high carbon minerals in domestic bauxite on the Bayer process production process, systematically combed the current application status of desulfurization and decarbonization technology, and emphatically introduced the practice of desulfurization, desiliconization and decarbonization process in an alumina enterprise. Combined with the characteristics of bauxite in Sanmenxia area of Henan Province, the alumina enterprise proposed a positive flotation synchronous desulfurization and desilication process for low-grade high-sulfur bauxite after process modification and collector formula optimization. Under the premise of desilication rate of 60%-65%, the desulfurization rate of 60%-70% can be obtained. A reverse flotation desulfurization process was proposed for high-sulfur bauxite with sulfur content greater than 2.0%, and the desulfurization rate reached about 85%. At the same time, combined with the advantages of sintering process and Bayer process, a low-cost process decarburization process was proposed, and the decarburization rate reached about 30%. Focusing on the combination of source impurity removal and process impurity removal is the direction of efficient and economical utilization of high-sulfur and high-carbon bauxite in the future.