桐柏萤石矿点星罗棋布,自1958年开采至今,富矿已基本少见,大量的萤石砂被丢弃。为了变废为宝,我们根据原矿砂含SiO_2高的特点,进行了降硅试验。采用两次磨矿,一粗六精开路流程,精矿质量达到特级标准。此后,我们又采用两次磨矿、一粗六精闭路流程进行了工业性试验,效果也很好。由于SiO_2不稳定,这样磨矿细度必须保证在85％ Tongbai fluorite ore dotted, mining since 1958 so far, the rich ore has been basically rare, a large number of fluorite sand was discarded. In order to turn waste into treasure, we have carried out the descending silicon test according to the characteristics of the original ore containing SiO_2. Using two grinding, a crude six fine open process, concentrate quality to super standard. Since then, we have adopted two grinding, a crude six precision closed-circuit process for industrial testing, the effect is also very good. Due to the instability of SiO 2, the fineness of grinding must be guaranteed at 85%