宽甸某低品级菱镁矿立式辊磨-浮选试验研究

辽宁宽甸某低品级菱镁矿石MgO、SiO₂、CaO含量分别为45.23%、3.36%、0.98%，主要脉石矿物为石英、滑石、白云石、方解石等。为开发利用该矿石，对其进行了立式辊磨-浮选试验研究。结果表明：在给矿粒度为-12 mm时、使用MPS32立式辊磨机在转盘转速为24.5 r/min、单辊压力为2 100 kN条件下进行磨矿，获得的产品细度为-0.074mm占81.6%，然后以十二胺为捕收剂、2号油为起泡剂，经1粗2精开路反浮选脱硅，反浮选精矿以碳酸钠为pH调整剂、水玻璃和六偏磷酸钠为抑制剂、油酸钠为捕收剂，经1粗1精正浮选提镁，可以获得MgO含量为47.24%、SiO₂含量为0.27%、CaO含量为0.29%、MgO回收率为65.14%的菱镁矿精矿。试验取得了较好的分选指标，可以为该菱镁矿的开发利用提供依据。

Research on Low-grade Magnesite from Kuandian Vertical Roller Mill-Flotation Experiment

There is 45.23% MgO，3.36% SiO₂ and 0.98% CaO in magnesite from Kuandian of Liaoning Province，main gangue minerals are quartz，talcum，dolomite andcalcite.In order to develop and utilize the ore，vertical roller mill grinding-flotation process tests were carried out.The results indicated that，at the feeding fineness of -12 mm，using vertical roller mill at the rotate speed of 24.5 r/min，single roller presser of 2 100 kN，ground products with grinding fineness of 81.6% passing 0.074 mm，using dodecylamine acetate as collector，2# oil as frother，via one roughing-two cleaning reverse flotation process to desilicication，concentrate of reverse flotation using sodium carbonate as pH regulator，sodium silicate and sodium hexametaphosphate as depressor，sodium oleate as collector，via one roughing one cleaning direct flotation process to concentration magnesite，magnesite concentrate was obtained with MgO content of 47.24%，SiO₂ content of 0.27%，CaO content of 0.29% and the recovery of MgO is 65.14%.Good beneficiation test results had been obtained，which can provide technique basis for the utilization of the ore.