江西某钨锡重选尾矿综合回收石英和长石试验研究

针对江西某钨锡重选尾矿中石英、长石、云母含量高的特点，试验采用磨矿—磁选除铁—脱泥—云母浮选—石英与长石浮选分离的无氟少酸工艺综合回收石英和长石。在试样磨矿细度?0.074 mm含量占73.20%、磁场强度为1.0 T条件下进行磁选除铁，非磁性产品采用静置—虹吸方法脱去?0.020 mm细泥。磨矿—磁选—脱泥等预处理后的样品采用碳酸钠调整矿浆pH=10.5、捕收剂YF-1用量240 g/t 和十二胺用量80 g/t 联合浮选云母。对云母浮选尾矿以Ba2+用量120 g/t活化石英、YF-2用量250 g/t 抑制长石、捕收剂YF-1用量250 g/t 进行石英与长石的浮选分离。石英浮选尾矿即为长石精矿 ，石英精矿通过酸法反浮选长石工艺得到石英精矿和长石副产品。试验获得石英精矿产率25.30%，SiO₂含量99.20%，石英矿物回收率50%；长石精矿产率22.69%，K₂O+Na₂O含量13.16%，长石副产品产率7.68%，K₂O+Na₂O含量9.23%，长石矿物总回收率约79%；云母精矿产率14.50%，K₂O含量7.65%，Na₂O含量1.65%，Al₂O₃ 含量16.40%，云母矿物回收率85%。 

Experimental Study on Comprehensive Recovery of Quartz and Feldspar from a Tailings of Tungsten and Tin Gravity Separation in Jiangxi

According to the characteristics of high content of quartz, feldspar and mica in the tailings of tungsten and tin gravity separation from Jiangxi Province, a fluoride-free and less acid process of grinding-iron removal by magnetic separation-desliming-mica floatation-quartz and feldspar flotation separation was adopted to comprehensively recover quartz and feldspar. Magnetic separation was carried out with the sample grinding fineness of ?0.074 mm content 73% and the magnetic field intensity of 1.0 T, following the fine mud of ?0.020 mm removed by static-siphon method for non-magnetic products. Furthermore, the mica was floated using a combination of YF-1 (240 g/t) and dodecylamine (80 g/t) as collectors while the slurry pH was adjusted to 10.5 by Na₂CO₃. Subsequently, quartz and feldspar were separated from mica flotation tailings using Ba2+ as the activator of quartz (120 g/t), YF-2 as the inhibitor of feldspar (250 g/t), and YF-1 as the collector (250 g/t). The flotation tailings was feldspar concentrate, and the flotation concentrate was further separated to obtain the quartz concentrate and feldspar by-products by reverse flotation feldspar process under acidic conditions. The yield of quartz concentrate was 25.30% with a SiO₂ content of 99.20%, and the recovery rate of quartz mineral was 50%. Additionally, the yield of feldspar concentrate was 22.69% with K₂O+Na₂O content of 13.16%, while the yield of feldspar by-products was 7.68% with the content of K₂O+Na₂O of 9.23%, and the total recovery of feldspar mineral was 79%. The yield of mica concentrate was 14.50%, with K₂O, Na₂O, and Al₂O₃ content of 7.65%, 1.65%, and 16.40%, respectively. The recovery rate of mica mineral was 85%.