贵州某高硫铝土矿工艺矿物学研究

Study on Process Mineralogy of A High-sulfur Bauxite Ore in Guizhou

以贵州某高硫铝土矿为研究对象,采用元素分析、矿物自动分析仪(MLA)和扫描电镜(SEM)等方法,研究了高硫铝土矿的化学组成、主要矿物的解离度及连生关系、矿物表面形貌等,结果表明:矿石中Al_(2)O_(3)含量为62.71%,S含量为3.37%,SiO_(2)含量为9.94%;矿石中元素Ce和Ga含量分别达到121.0 g/t和40.3 g/t;黄铁矿在矿石中分布广泛,与一水硬铝石连生紧密,嵌布粒度较细;在磨矿细度为-0.075 mm占77%的条件下,一水硬铝石和黄铁矿的解离度分别为14.10%和71.20%,黄铁矿解离度较高,一水硬铝石解离度较低,可采用“阶段磨矿—阶段选别”的浮选工艺脱硫。

This paper aims to study the chemical composition,liberation degree,interlocking relationship and surface morphology of the main minerals in high-sulfur bauxite.The high-sulfur bauxite ore in Guizhou,China was taken as the study object.By adopting the means of elemental analysis,mineral liberation analyzer(MLA)and scanning electron microscope(SEM),the research came to the following findings.The contents of Al_(2)O_(3),S and SiO_(2) in ore were 62.71%,3.37%and 9.94%,respectively.The contents of Ce and Ga in ores were 121.0 g/t and 40.3 g/t,respectively.Pyrite was widely distributed in the ore,closely associated with diaspore,with fine embedded particle size.When the grinding fineness was-0.075 mm accounting for 77%,the liberation degrees of diaspore and pyrite were 14.10%and 71.20%,respectively.Because the liberation degree of pyrite was high,and the liberation degree of diaspore was low,the flotation process of'stage grinding-stage separation'could be used for desulfurization.