安徽某地长石石英降铁分离选别试验研究

Experiment of iron reduction and fledspar-quartz flotation separation in Anhui province

石英长石的无氟浮选分离一直是个难题。本文对安徽某地石英正长岩进行原矿性质研究,表明其Fe2O3质量分数较高,且多存在于黑云母中,考虑到黑云母具有弱磁性,因此采用强磁选除去。通过磨矿细度和磁场强度试验,最终确定在磨矿细度为-0.074mm占77%,磁场强度为1432kA/m条件下,可除去产率为14.14%的黑云母,强磁尾矿中仍有1.70%的Fe2O3,为了减小黑云母在后续石英—长石浮选分离中的影响,采用浮选再次降铁,可将Fe2O3质量分数降至1.0%。随后对磁选—浮选尾矿进行了长石—石英浮选分离选别试验,重点考察了六偏磷酸钠、常用捕收剂种类及其用量3个因素。结果表明,在溶液pH=2,使用十二胺和2#油,采用一粗一扫浮选流程,可得到产率30.70%,K2O质量分数12.08%的长石精矿。

Quartz feldspar non-fresno flotation separation has been a difficult question.Research on the properties of raw ore showed that Fe2O3 content is 3.79% and most of Fe2O3 exists in biotite.In consideration of the low-magnetic of biotite,strong magnetic separation was adopted to reduce Fe2O3.On the basis of grinding fineness test and magnetic field strength experiment,the optimum condition was grinding fineness is -0.074mm 77% with 1432kA/m magnetic strength,under this condition,14.14%biotite was removed.But there is 1.70% Fe2O3 in the magnetic separation tailing.In order to decrease the effect of biotite on the separation flotation of feldspar and quartz,flotation was used to reduce iron again in raw ore to 1.0% Fe2O3.Three factors were researched in the following flotation of feldspar and quartz,sodium hexametaphosphate,collectors kind and dosage of collector.It was showed that feldspar concentrate with productivity 30.70%,K2O 12.08% grade could be got under the condition of pulp pH 2,lauryl amine and 2# oil,and the final flotation circuit was one roughing stage,one scavenging.