摘要
我国铝土矿保有量有限,高品位铝土矿由于掠夺性开采而面临枯竭,具有高品位的高硫铝土矿将是今后氧化铝生产的主要矿物原料。铝土矿中的硫是影响氧化铝生产中的重要杂质之一,硫的含量直接影响到氧化铝生产的指标。高硫铝土矿的矿石性质和赋存状态研究表明,硫主要是以黄铁矿的形式赋存在矿物中.本文针对我国高硫铝土矿无法直接应用于工业生产这一现状,采用选矿手段,对含硫煤下铝土矿进行脱硫试验研究。采用单因素试验,研究了煤下高硫铝土矿浮选脱硫的工艺条件,重点考察了磨矿细度、浮选矿浆浓度、pH值及调整剂BKS-SNS对浮选的影响,得出了浮选脱硫的最佳工艺条件:磨矿细度(-0.075 mm)75%,矿浆浓度25%,pH值9.0,调整剂BKS-SNS用量2000 g/t。在最佳工艺条件下,获得了铝精矿铝硅比6.01,氧化铝回收率为94.13%、含硫量为0.35%的选别指标,达到氧化铝生产要求。不仅提供了满足氧化铝生产要求的优质可利用资源,同时实现了含硫矿物的高效利用,变废为宝,对于保护矿山环境,开展高硫铝土矿绿色生产氧化铝技术具有重大的环境和社会效益。
Due to the limited amount of bauxite and the depletion of high-grade bauxite in China, the high grade sulfur bauxite will be the main mineral raw material for alumina production in the future. Sulfur which is one of the important impurities in bauxite affects alumina production index. Study on ore properties and occurrence status indicated that the sulfur in alumina ores mainly occurs as pyrite. The high sulfur bauxite cannot be directly put into alumina process for its high sulfur content. In this article, the method of flotation was used in the desulfurization of high sulfur bauxite under the coal seam. Single factor experiments, which mainly focused on grinding fineness, ore pulp concentration, pH value, and BKS-SNS concentration, were done to find the optimum technological conditions. The Results showed that the optimum grinding fineness（-0. 075 mm）was 75% ,while the optimum ore pulp concentration was 25%, and the optimum pH value was 9.0, and the optimum BKS-SNS consumption was 2000g/t. Under the optimum technological conditions, the alumina recovery rate was 94. 13 %, while alumina-silica ratio and sulfur content of the concentrate were respectively 6.01 and 0. 35%, which can fulfill the requirements of alumina production. The flotation desnlfurization technology not only providing the quality of available resources to alumina production, while achieving efficient use of sulfur-containing minerals, turning process waste into useful material, has significant environmental and social benefits for the protection of mine environment and high-sulfur bauxite green alumina production technology.
出处
《矿产综合利用》
北大核心
2017年第3期51-54,共4页
Multipurpose Utilization of Mineral Resources
关键词
高硫铝土矿
浮选
脱硫
High sulfur bauxite
Flotation
Desulphurization
