低品位铝土矿在旋流离心力场中的分选试验研究

以铝土矿中赋存的一水硬铝石和硅酸盐矿物间的硬度和密度差异为理论出发点，分析了对之实施分级和常规重力分选的困难所在，提出引入旋流离心力场以强化基于密度差异的分选作用，并对A/S为4.39、磨矿细度为-0.074 mm占61.90%的铝土矿进行了旋流分选试验。试验结果表明，增大水力旋流器的入料动压可同时获得A/S分别为7.64和2.18的底流和溢流产物，此时基于密度差异的分选作用可得到有效强化；增大水力旋流器的沉砂口直径，可以获得A/S为2.08和6.5～7.0的溢流和底流产物，这可为低品位铝土矿的预脱泥处理提供有效的技术途径。

Experimental Research on Separation of Low Grade Bauxite in Cyclonic Centrifugal Field

Theoretically based on the difference in the hardness and density of diaspore and silicate mineral in bauxite, the analysis is made of where the difficulty lies in their classification and separation by conventional gravity method. It is suggested to introduce a cyclonic centrifugal field to intensify the difference in density, and the test is made on bauxite ore with A/S of 4.39 and a grind of 61.90% -0.074mm. The test results show that by increasing the feeding pressure of the hydrocyclone,the separation based on the density difference can be effectively strengthened. Increasing the apex diameter of the hydrocyclone can obtain underflow and overflow with A/S being 6.5～7.0 and 2.08 respectively. This can be an effective technical reference for the pre-desliming of low grade bauxite.