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.%The high-sulfur bauxite in Wenshan of Yunnan is sedimentary bauxite and its high ratio of Al2O3to 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 quali-ty. Consequently,desulfurization is necessary for the utilization of this kind of bauxite. The content of sulfur,Al2O3and SiO2in 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 a-chieved. The technical indicators of the desulfurization by flotation are satisfying. The content of sulfur,Al2O3and SiO2inalumina concentrate is 0.43%,56.65% and 8.56%,respectively. The recovery of Al2O3is 92.71% and the A/S isincreased slightly to 6.62. The sulfur content and re-covery 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.
展开▼
