某低品位坡洪积型钛铁矿石选矿工艺研究

Study on Beneficiation Process of a Low Grade Slope-type Ilmenite Ore

江苏某坡洪积型钛铁矿石TiO2品位2.63%,钛铁矿嵌布粒度细,矿石矿物组成复杂,黏土含量高。为开发利用该矿石资源,在工艺矿物学性质研究的基础上,首先进行了重选预选工艺和磁选预选工艺对比试验,磁选预选工艺抛除尾矿产率大且TiO2损失率较低。对磁选预选精矿在一段磨矿细度为-0.076 mm占60%、二段磨矿细度为-0.076 mm占90%条件下进行二阶段磨矿-阶段磁选试验,TiO2品位由6.78%提高至14.53%;二段强磁精矿采用螺旋溜槽重选,重选精矿以硫酸为pH调整剂、草酸为抑制剂、水玻璃为分散剂、MOH为捕收剂,经1粗4精1扫闭路浮选,能获得TiO2品位48.26%、回收率13.69%的钛精矿。因此,采用原矿强磁预选-预选精矿二阶段磨矿阶段磁选-磁选精矿螺旋溜槽重选-重选精矿浮选的联合选矿工艺,最终能获得TiO2品位高于48%的合格钛精矿。试验结果可以为坡洪积型钛铁矿石的开发利用提供参考依据。

The TiO2 grade of a sloping ilmenite ore in Jiangsu Province is 2.63%.The ilmenite is fine in grain size,mineral composition is complex and high clay content.In order to develop and utilize the ore resources,based on the research of process mineralogical properties,the comparison test of gravity separation pre-separation process and the magnetic separation pre-separation process were first carried out,compared with the gravity pre-separation process,magnetic pre-separation process has large yield of tailings and low loss rate of TiO2.The magnetic pre-separation concentrate was subjected to two stage grinding-stage magnetic separation test,at first stage grinding fineness is 60%passing 0.076 mm,second stage grinding fineness is 90%passing 0.076 mm,the grade of TiO2 is increased from 6.78%to 14.53%.The second-stage high intensity magnetic concentrate is separated by spiral.Gravity concentrate with sulfuric acid as pH adjuster,oxalic acid as inhibitor,sodium silicate as dispersing agent,and MOH as collector,via one roughing four cleaning one scavenging closed circuit flotation process,titanium concentrate with TiO2 grade of 48.26%,the recovery rate of 13.69%was obtained.Above all,via high intensity magnetic pre-separation-pre-separation concentrate two stage grinding stage magnetic separation-spiral gravity separation on magnetic concentrate-gravity concentrate flotation combined beneficiation process,titanium concentrate with TiO2 grade of above 48%can be obtained.The test results can provide reference for the development and utilization of slope alluvial ilmenite ore.