袁家村闪石型磁铁矿选矿技术开发

袁家村难选闪石型磁铁矿具有铁硅酸盐含量高、矿物组成复杂、矿物嵌布粒度极细的特点。在工艺矿物学研究的基础上，通过预选（早丢）和弱磁精矿反浮选或淘洗磁选在相对粗粒条件下获得大部分高品位铁精矿，达到降低磨矿成本的目的。最终得出了适合袁家村闪石型磁铁矿石的选矿工艺流程，采用-3 mm湿式预选-两段阶磨-四次弱磁选-反浮选-浮尾再磨弱磁选流程，可获得精矿产率29.42%、铁品位68.16%、回收率66.55%的指标。该工艺解决了袁家村闪石型磁铁矿经济开发利用的难题。 

Beneficiation Technology for Amphibole Type Magnetite Ore in Yuanjiacun

The refractory amphibole type magnetite in Yuanjiacun iron ore deposit has the characteristics of high content of iron-bearing silicate, complex mineral composition, and extremely fine dissemination sizes. Based on process mineralogy study, the purpose of reducing the cost of grinding was achieved through the process of preconcentration (early loss) and reverse flotation or elutriation magnetic separation of the low intensity magnetic separation (LIMS) concentrate to obtain most of the high-grade iron concentrate under relatively coarse grain conditions. Finally, the ore dressing process suitable for amphibole type magnetite ore in yuanjiacun was developed, which contained a wet preconcentration of -3 mm grains, two stages of grinding, four times of low intensity magnetic separation, a reverse flotation, and a regrinding of flotation tailings with the LIMS. With this process, an iron concentrate with a yield of 29.42%, a TFe grade of 68.18%, and a TFe recovery of 66.55% could be obtained. This study solves the problem of the economic exploitation and utilization of the amphibole type magnetite ore in Yuanjiacun.