Abstract: The desulfurization of high-sulfur diasporic bauxite from China with flotation process and butyl xanthate as collector was studied, and the effects of flotation time, pulp density, pH value and particle size of ores on the desulfurization rate were examined. The results indicated that the sulfur in bauxite was successfully decreased through flotation. The sulfur content was lowed to 0.41% under the conditions of pH value at 10, the dose of flotation agent butyl xanthate 0.16 kg/t, frother 20 g/t, flotation time 15 min, mass ratio of liquid to solid 10, the particle size of ores 0.15 mm, and the reclamation of Al2O3 was 90.83%. The kinetics of flotation desulfurization was also studied. The flotation obeyed the first order kinetic equation.

Key words: bauxite, floatation, desulfurization, kinetics, butyl xanthate

摘要： 采用浮选方法对我国含硫一水硬铝石型铝土矿进行脱硫，采用单因素实验研究了高硫铝土矿在浮选剂丁基钠黄药作用下反浮选除硫的工艺条件，考察了浮选剂用量、浮选时间、浮选矿浆浓度(液固质量比)、pH值及矿石粒度对浮选的影响. 结果表明，反浮选除硫的合适工艺条件为，矿浆pH 10、浮选剂用量0.16 kg/t、起泡剂20 g/t、浮选刮泡时间15 min、液固质量比10、矿石粒度0.15 mm. 在此工艺条件下，铝土矿中硫含量由2.08%降低到0.41%，符合我国氧化铝工业对矿石中硫含量的要求，Al2O3回收率达90.83%. 浮选过程基本符合一级动力学反应方程.

关键词: 铝土矿, 浮选, 脱硫, 动力学, 丁黄药