黑龙江某难选锌铁矿浮选-磁选联合选别工艺研究

Study on Flotation-Magnetic Separation Combined Beneficiation of Certain Zn-Fe Ore in Heilongjiang

黑龙江某锌铁矿石由于矿物组成复杂,且毒砂等含砷矿物含量较高而难以有效回收利用。针对该锌铁矿的矿物组成及粒度嵌布特征,开展了优先浮选闪锌矿、浮选尾矿进行磁选回收磁铁矿的工艺流程试验。结果表明:在磨矿细度为-0.074 mm占75%条件下,以硫酸铜为活化剂、亚硫酸钠为抑制剂、硫氨酯为捕收剂,经过1粗3精2扫的闭路浮选工艺流程,可以获得Zn品位47.45%、Zn回收率94.31%、As品位0.13%的锌精矿,同时获得Fe品位31.84%的锌浮选尾矿;将锌浮选尾矿在磁选粗选磁场强度79.6 kA/m条件下经过1次磁选粗选,粗精矿再磨至细度-0.038 mm占85%,经磁场强度条件下55.7 kA/m二次磁选,可以获得Fe品位67.54%、Fe回收率50.81%、As品位0.06%、S品位0.28%的铁精矿。试验结果可为复杂难选锌铁矿石的有效回收利用提供依据。

Azinc-iron ore is difficult to be effectivelyrecycled because of its complex mineral composition and high content of arsenic containing minerals such as arsenopyrite.According to the mineral composition and particle size distribution characteristics of the zinc-iron ore,the process tests of preferential flotation of sphalerite and flotation tailings for magnetic separation and recovery of magnetite was carried out.The results show that whenthe proportion of grinding fineness of-0.074 mm is 75%,with copper sulfate as activator,sodium sulfite as inhibitor and thiourethane as collector,zinc flotation concentrate with Zn grade of 47.45%,Zn recovery of 94.31%and As grade of 0.13%can be obtained,and the flotation tailings with Fe grade of 31.84%can be obtained by the closed-circuit flotation process.The zinc flotation tailings were subjected to primary magnetic separation under the condition of magnetic field strength of 79.6 kA/m.The coarse concentrate is grinded again to the fineness of-0.038 mm accounted for 85%.After secondary magnetic separation with the condition of magnetic field strength of 55.7 kA/m,iron concentrate with Fe grade of 67.54%,Fe recovery of 50.81%,As grade of 0.06%and S grade of 0.28%can be obtained.The above research results can provide a basis for the effective utilization of complex refractory zinc-iron ore.