海南石碌铁矿石磁化焙烧-弱磁选试验  

Experiment on Magnetization Roasting and Low Intensity Magnetic Separation of Shilu Iron Ores in Hainan Province

作　　者：梁居明 朱海龙[1] 王开扬[1] 李志明[2] LIANG Juming;ZHU Hailong;WANG Kaiyang;LI Zhiming(Hainan Mining Co.,Ltd.;School of Resources and Civil Engineering,Northeastern University)

机构地区：[1]海南矿业股份有限公司 [2]东北大学资源与土木工程学院

出　　处：《现代矿业》2022年第8期151-153,共3页Modern Mining

摘　　要：海南石碌铁矿石铁品位为40.21%,主要有害成分硫含量达1.32%,铁主要以赤铁矿的形式存在,分布率达73.56%。为确定该矿石的合理开发利用工艺进行了选矿试验。结果表明,采用预富集—磁化焙烧—弱磁选工艺处理试样,在磨矿细度为-0.074 mm占62.18%的条件下,采用1粗1精1扫、中矿顺序返回反浮选流程脱硫,1次中磁选+1次强磁选预富集,进入磁化焙烧—弱磁选工艺的矿量减少了16.50%,预富集精矿铁品位为45.61%、S含量为0.54%;预富集精矿在还原温度为520℃、还原剂浓度为30%、还原时间为20 min,弱磁选给矿细度为-0.038 mm占90%的情况下可获得铁品位为66.86%、回收率为92.27%的铁精矿,试验指标良好。The iron grade of iron ores in Hainan Shilu is 40.21%,and the content of sulfur of the main harmful ingredient is 1.32%.The iron mainly exists in the form of hematite,and the iron distribution rate is 73.56%.Beneficiation tests were carried out to determine the rational development and utilization process of the ore.The results showed that the samples were treated by preconcentration,magnetization roasting and low intensity magnetic separation when the grinding fineness of-0.074 mm accounts for 62.18%.The ore was desulfurized by the reverse flotation process of one roughing,one cleaning,one scavenging and middling return in sequence,and then enriched by one medium magnetic separation and one high intensity magnetic separation.The amount of ore entering the magnetic roasting and low intensity magnetic separation process is reduced by 16.50%,and the preconcentration concentrate with iron grade of 45.61%and sulfur content of 0.54%was achieved.The iron concentrate with iron grade of 66.86%and recovery rate of 92.27%was obtained under the conditions of reduction temperature of 520℃,reducing agent concentration of 30%,reduction time of 20 min and feeding fineness of low intensity magnetic separation of-0.038 mm accounting for 90%.

关 键 词：赤铁矿 磁化焙烧 弱磁选 

分 类 号：TD951[矿业工程—选矿] TD924