铜冶炼渣选铜尾矿还原焙烧—磁选回收铁工艺研究.docVIP

doi：10.3969/j.issn.1007-7545.2016.07.004 铜冶炼渣选铜尾矿还原焙烧—磁选回收铁工艺研究 朱茂兰1,2，熊家春3，胡志彪2，童长青2，王瑞祥3 (1.江西理工大学 应用科学学院，江西赣州 341000；2.龙岩学院 化学与材料学院，福建龙岩 364012；3.江西理工大学 冶金与化学工程学院，江西赣州 341000) 摘要：以炭粉为还原剂，通过还原焙烧—磁选工艺从铜冶炼渣选铜尾矿中回收铁，考察了影响铁回收效果的主要工艺参数，并通过试验验证。结果表明，在炭粉用量为铜渣量的25%、氧化钙用量为铜渣量的10%、焙烧温度1 300 ℃、焙烧时间1.5 h、焙烧产物磨细度为-0.074 mm占55%的条件下，磁选精矿（即还原铁粉）铁含量可达92.16%，尾矿铁含量可降低至3.91%，铁回收率87.65%。 关键词：铜冶炼渣；还原焙烧；磁选；回收；铁 中图分类号：TF111.13 文献标志码：A 文章编号：1007-7545（2016）07-0000-00 Iron Recovery from Copper Tailings of HYPERLINK /dict_result.aspx?searchword=%e9%93%9c%e5%86%b6%e7%82%bc%e6%b8%a3tjType=sentencestyle=t=copper+smelting+slagCopper Smelting Slag with Reduction Roasting and Magnetic Separation ZHU Mao-lan1,2, XIONG Jia-chun3, HU Zhi-biao2, TONG Chang-qing2, WANG Rui-xiang3 (1, School of Applied Sciences, Jiangxi University of Science and Technology, Ganzhou 34l000, Jiangxi, China； 2. College of Chemistry and Materials Science, Longyan University, Longyan 364012, Fujian, China; 3. Faculty of Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 34l000, Jiangxi, China) Abstract：Iron was recovered from copper tailings of copper smelting slag by reduction roasting and magnetic separation with powdered carbon as reductant. Effect of parameters on iron recovery was investigated and verified with experiments. The results show that content of iron in magnetic concentrate is 92.16% and that of iron in gangue drops to 3.91% with iron recovery of 87.65% under the optimum conditions including dosage of carbon powder and CaO of 25% and 10% of slag amount respectively, roasting temperature of 1 300 ℃, roasting time of 1.5 h, and size of roasted product of -0.074 mm of 55%. Key words：copper smelting slag; reduction roasting; magnetic separation; iron; recovery 目前火法炼铜产量占铜产量的80%以上[1]。火法炼铜产生大量炉渣，其中含有铜、铁、锌、铅、镍、钴、金、银等有价金属元素，不同冶炼工艺产生的铜渣成分略有差别，但其主要成分铜、铁含量分别为0.7%~0.9%、38%~41%，均高于一般矿石品位，具有较高的经济价值。从炉渣中回收有价金属主要有火法贫化[2]、湿法分离[3]和炉渣选矿[4]等方法。炉渣中铁主要以铁橄榄石(Fe2SiO4)形式存在，采用传统方法难以有效回收，通常富集到选铜尾矿中。 从选