某氰化尾渣煤基还原焙烧-磁选试验

在对某氰化尾渣进行化学分析和X射线衍射分析的基础上，进行了煤基还原焙烧-磁选试验研究，着重探讨了还原煤的种类和添加量、焙烧温度、焙烧时间对试验结果的影响。试验结果表明，用烟煤为还原剂，不仅用量比褐煤少，而且试验指标更好；在烟煤添加量为18%、焙烧温度为750 ℃、焙烧时间为60 min、焙烧产品磨矿细度为-0.074 mm占90%的情况下，经1粗1精弱磁选（磁场强度为149.6 kA/m），获得了铁品位为60%、回收率为70.80%的铁精矿。

Coal-based Reduction-Roasting of Ferric Oxide from A Cyanidation Slag

The research on coal-based reduction roasting-magnetic separation mineral processing is carried out on the basis of chemical analysis and X-ray diffraction analysis of the cyanidation slag.The effects of experimental conditions,such as the type and quality of reductant,roasting temperature and time were investigated.The results show that bituminous coal as the reductant was not only less than lignite,but better test indicator.When the slag was roasted at 750 ℃ for 60 min,followed by grinding to the fineness of-0.074 mm 90% and two-stage magnetic separation with the magnetic intensity of 149.6 kA/m,70.80% of the iron in the slag reduced by 18% bituminous coal was recovered as the product with 60% iron.