云南某低品位铝土矿铝硅浮选分离试验研究

云南文山某低品位铝土矿Al2O3及SiO2含量分别为44.35%、10.52%，Fe及TiO2含量分别为13.36%、4.64%，属于高铁高钛、低铝低硅型铝土矿；可回收铝矿物主要以一水硬铝石相态存在，铁矿物主要包括赤铁矿与针铁矿，钛矿物主要以锐钛矿相态存在，脉石矿物主要为高岭石。对该矿石进行了铝硅浮选分离试验研究，重点考察了捕收剂种类与用量、磨矿细度、调整剂用量、抑制剂种类与用量等条件对浮选效果的影响，确定了以改性组合脂肪酸KYB为捕收剂，硅酸钠+GY 3为组合抑制剂，碳酸钠为调整剂的药剂制度。在磨矿细度为-0.074 mm占90%的条件下，采用“1粗2精1扫”闭路试验可获得铝精矿Al2O3含量为53.34%、铝硅比为9.79、Al2O3回收率为81.62%的技术指标。研究结果可为开发该类铝土矿资源提供技术支撑及借鉴。

Experimental Study on Flotation Separation of Aluminum and Silicon for a Low Grade Bauxite in Yunnan

The Al2O3 and SiO2 contents of a low grade bauxite from Wenshan,Yunnan are 44.35% and 10.52%,Fe and TiO2 contents are 13.36% and 4.64%,respectively,which belongs to high iron and titanium,low aluminum and silicon bauxite.The recoverable aluminum minerals mainly exist in diaspore phase.The iron minerals mainly include hematite and goethite.The titanium minerals mainly exist in anatase phase,and the gangue mineral mainly is kaolinite.The flotation separation research of aluminum and silicon were carried out for the ore,focusing on influence of the kind and dosage of collectors,the grinding fineness,dosage of adjusting agent,kind and dosage of inhibitors on the flotation effects,and finally determine the agent system with modified fatty acids KYB as collector,sodium silicate + GY 3 as combination inhibitor,sodium carbonate as adjusting agent.Under the condition of grinding fineness of -0.074 mm accounting for 90%,the technical indexes of Al2O3 contents of 53.34%,Al—Si ratio of 9.79 and Al2O3 recovery rate of 81.62% were obtained by closed circuit test of "one roughing,two cleaning and one scavenging".The research results could provide technical support and reference for the development of the bauxite resources.