|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Alumina & Bauxite
||A Novel Process of Alumina Production from Low-grade Bauxite Containing Sulfur
||Bo Wang, Kai Zhao, Huilan Sun, Xuezheng Zhang, Zepeng Li, Hongyou Ma
|On-Site Speaker (Planned)
Soda-lime sintering process and lime sintering process are the research focus on utilization of low-grade alumina recently. The latter process can realize dry-sintering process and its energy consumption is relatively lower. However, its sintering temperature is up to 1350°C, which is unfavorable to industrial production. Based on lime sintering method, a novel process of alumina production from low-grade bauxite containing sulfur or fly ash is carried out in this paper. The phase of alumina transforms from 12CaO•7Al<SUB>2</SUB>O<SUB>3</SUB> (C<SUB>12</SUB>A<SUB>7</SUB>) to 4CaO•3Al<SUB>2</SUB>O<SUB>3</SUB>•SO<SUB>3</SUB> (C<SUB>4</SUB>A<SUB>3</SUB>S), whose alumina leaching property is better, through decreasing sinter temperature and time and adjusting the content of CaSO<SUB>4</SUB> in this process. The main phases of the clinker sintered at 1250°C are C<SUB>4</SUB>A<SUB>3</SUB>S and silicon dioxide. Its leaching ratio reaches 89% after 10min reaction, and the conditions of leaching temperature and sodium carbonate’s concentration are lower than that of C<SUB>12</SUB>A<SUB>7</SUB>.
||Planned: Light Metals