江苏某原生金红石矿选矿试验研究

Experimental study on mineral processing of a primary rutile ore in Jiangsu province

江苏东海某金红石原矿TiO_(2)品位为4.01%,通过浮选试验研究了其获得合格金红石精矿的可行性,结果表明:该原矿的最佳磨矿细度为-0.074 mm质量分数占47.36%,最佳脱泥时间为1 min。粗选正交试验显示氟硅酸钠用量是影响精矿TiO_(2)品位和回收率的显著因素,粗选较优的药剂制度为硝酸铅用量300 g/t、氟硅酸钠用量800 g/t、SPA用量600 g/t、水玻璃用量200 g/t。在此条件下,采用一粗一扫两精的开路浮选工艺流程处理金红石原矿,对所得浮选精矿在50 A磁选电流下进行磁选,可以得到金红石精矿TiO_(2)品位为84.68%、回收率为65.27%的优异指标;同时,磁选尾矿为钛铁矿,其TiO_(2)品位为47.59%,亦达到了我国对钛铁矿中钛品位的要求。

The TiO_(2) grade of a certain rutile ore in Donghai,Jiangsu province is 4.01%,and the feasibility of obtaining qualified rutile concentrate was investigated by flotation flotation experiments.The results showed that the optimal grinding fineness of the ore is-0.074 mm,with the mass fraction of 47.36%,and the optimal time of desliming is 1 minute.The orthogonal experiment of rough selection shows that the dosage of sodium fluorosilicate is the significant factor affecting the grade and recovery rate of TiO_(2) concentrate.The optimal reagent system for rough selection is lead nitrate dosage of 300 g/t,sodium fluorosilicate dosage of 800 g/t,SPA dosage of 600 g/t,and sodium silicate dosage of 200 g/t.Under these conditions,the open-circuit flotation process with one coarse,one sweep,and two concentrates is adopted to treat the raw ore of rutile.The obtained flotation concentrate is magnetically separated under a 50 A magnetic separation current,and excellent indicators of rutile concentrate TiO_(2) grade of 84.68%and recovery rate of 65.27%can be obtained;Meanwhile,the magnetic separation tailings are ilmenite,with a TiO_(2) grade of 47.59%,which also meets China's requirements for the titanium grade in ilmenite.