粒度分级对脉石英提纯效果影响研究

脉石英是一种优质硅资源,是加工高纯石英的理想原料。对脉石英矿进行了工艺矿物学研究,并分析破碎后和磨矿后不同粒级试样的差异。对原矿-0.6+0.1 mm粒级、-0.1+0.045 mm粒级和磨矿后得到的-0.6+0.1 mm粒级、-0.1+0.045 mm粒级四个试样分别进行磁选除铁和浮选除长石、云母实验。结果表明,该脉石英以大石英颗粒为主,脉石矿物为云母类、长石类矿物和少量铁矿物,四个试样在品质上存在差异。原矿-0.6+0.1 mm、-0.1+0.045 mm粒级和磨矿后得到的-0.6+0.1 mm、-0.1+0.045 mm粒级经分级分选后SiO₂含量从原矿的99.10%分别提升至99.62%、99.74%、99.67%和99.66%,Fe₂O₃含量则从609.55 μg/g分别降至70.26 μg/g、69.90 μg/g、38.64 μg/g和40.33 μg/g。总体上,磨矿后得到的-0.6+0.1 mm粒级的提纯效果最为显著,说明分级分选利于优质石英的提纯。

Effect of Particle Size Classification on Purification of Vein Quartz

Vein quartz is a kind of high quality silicon resource as an ideal raw material for processing high purity quartz. The process mineralogy of vein quartz was studied. The differences of samples with different size fractions after crushing or grinding were also analyzed. The experiments of iron removal by magnetic separation and feldspar and mica removal by flotation were carried out on four samples of -0.6+0.1 mm grade, -0.1+0.045 mm grade of raw material and -0.6+0.1 mm grade, -0.1+0.045 mm grade of grinding product, respectively. The results show that the vein quartz mainly consists of large quartz grains and the gangue is mainly muscovite, feldspar and a small amount of iron minerals. The content of SiO₂ in -0.6+0.1 mm grade, -0.1+0.045 mm grade of raw material and -0.6+0.1 mm grade, -0.1+0.045 mm grade of grinding product are increased from 99.10% to 99.62%, 99.74%, 99.67% and 99.66%, respectively. And the contents of Fe₂O₃ in each sample are decreased from 609.55 μg/g to 70.26 μg/g, 69.90 μg/g, 38.64 μg/g and 40.33 μg/g respectively. In general, the purification effect of -0.6+0.1 mm grade of the grinding product is the best, showing that the classification separation process is beneficial to the purification of vein quartz.