新型活化剂在高硫铝土矿浮选脱硫中的应用研究

云南文山高硫铝土矿主要为沉积型铝土矿，矿石铝硅比较高，能满足拜耳法生产氧化铝需求。但矿石中硫含量高，范围为1%~18%，硫在拜尔法生产过程中会造成管道结疤、碱耗升高、晶种分解速度降低及氧化铝品质降低等不利影响，高硫铝土矿需脱硫后才能资源化利用。此次研究矿样硫含量为6.8%，Al₂O₃含量为49.39%，SiO₂含量为7.87%，A/S比为6.27。采用新型活化剂及组合捕收剂开展浮选脱硫，实现了无酸活化及强化回收黄铁矿的目的，浮选脱硫技术指标良好，能得到铝精矿硫含量为0.43%，Al₂O₃含量56.65%，Al₂O₃回收率为92.71%，SiO₂含量为8.56%，A/S比为6.62，铝硅比略有提高；硫精矿含硫34.06%，硫回收率为94.88%。本研究为该类型高硫铝土矿的高效利用提供了参考借鉴。 

Application of a New Activator in Desulfurization of High-sulfur Bauxiteby Flotation

The high-sulfur bauxite in Wenshan of Yunnan is sedimentary bauxite and its high ratio of Al₂O₃ to SiO₂(A/S) can meet the requirements of alumina production by Bayer process. The high sulfur content in ores of 1% to 18%, however, is unfavorable as sulfur will cause pipe scale, increase of alkaline consumption, slowing down of seed precipitation and sacrifice of alumina quality. Consequently, desulfurization is necessary for the utilization of this kind of bauxite. The content of sulfur, Al₂O₃ and SiO₂ in the sample for the tests is 6.8%, 49.39% and 7.87%, respectively, and the A/S is 6.27. Desulfurization of high-sulfur bauxite by flotation was carried out by using a new activator and combined collectors. Acid-free activation and intensive pyrite recovery were achieved. The technical indicators of the desulfurization by flotation are satisfying. The content of sulfur, Al₂O₃ and SiO₂ inalumina concentrate is 0.43%, 56.65% and 8.56%, respectively. The recovery of Al₂O₃ is 92.71% and the A/S isincreased slightly to 6.62. The sulfur content and recovery in sulfur concentrate is 34.06% and 94.88% respectively. This study serves as a reference for the efficient utilization of this kind of high-sulfur bauxite.