木屑对铁尾矿磁化焙烧磁选工艺的影响  

Effects of sawdust on magnetization calcination-magnetic separation process of iron tailings

作　　者：黄玥 陈海斌 蒙李燕 宁寻安[1,2] 路星雯 余国煜 王逸 HUANG Yue;CHEN Haibin;MENG Liyan;NING Xun′an;LU Xingwen;YU Guoyu;WANG Yi(School of Environmental Science and Engineering,Guangdong University of Technology,Guangzhou 510006,China;Institute of Environmental Health and Pollution Control,Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control,Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control,Guangzhou 510006,China;Guangzhou Zefang Environmental ProtectionTechnology Co.Ltd.,Guangzhou 510006,China)

机构地区：[1]广东工业大学环境科学与工程学院,广州510006 [2]广东省环境催化与健康风险控制重点实验室,广州市环境催化与污染控制重点实验室,环境健康与污染控制研究院,广州510006 [3]广州泽方环保科技有限公司,广州510006

出　　处：《环境工程学报》2020年第11期3147-3154,共8页Chinese Journal of Environmental Engineering

基　　金：2017年土壤中央专项(18HK0108);广东省“珠江人才计划”本土创新科研团队项目(2017BT01Z032)。

摘　　要：由于我国铁尾矿堆存量大、铁品位低,导致其资源化利用率低,因此,以木屑生物质作还原剂回收铁尾矿中的铁元素,考察不同焙烧温度、焙烧时间、木屑添加量等对铁尾矿磁化焙烧的影响。结果表明:木屑磁化焙烧提高铁尾矿磁性性能的最佳焙烧条件为焙烧温度750℃、木屑添加量15%及焙烧时间40 min;在该条件下,铁精矿品位为62.84%,且铁回收率为94.58%。经物相分析发现,原铁尾矿中,含铁矿物主要为赤铁矿,而焙烧后主要以磁铁矿为主。振动样品磁强计分析表明,铁矿石的饱和磁化强度从0.04 emu·g-1提高到了46.01emu·g-1。以木屑生物质作为还原剂进行铁尾矿磁化焙烧,可较好地提高其中铁的品位和磁化强度,从而实现铁矿石的低强度磁选分离。China’s iron tailings pile has a large stock and low iron grade, resulting in its low resource utilization rate. In this study, sawdust biomass was used as reducing agent to recover the iron element in iron tailings, and the influence of calcination temperature, calcination time and sawdust dosage on magnetization-calcination of iron tailings. The results show that the best conditions for sawdust magnetization calcination to improve the magnetic property of iron tailings were as follows: calcination temperature of 750 ℃, 15% sawdust dosage and calcination time of 40 min, at which the iron concentrate grade and iron recovery rate were 62.84% and 94.58%,respectively. Phase analysis showed that hematite was the main crystalline phase in the iron-bearing minerals of raw iron tailings were mainly, and magnetite was the main crystalline phase in calcined iron tailings. The analysis with vibration sample magnetometer further showed that the saturation magnetization of iron ore increased from 0.04 emu·g-1 to 46.01 emu·g-1. Magnetization calcination using sawdust biomass as a reducing agent could greatly improve the grade and magnetization intensity of iron in iron tailings, and achieve lowintensity magnetic separation of iron oxide.

关 键 词：铁尾矿 木屑 磁化焙烧 磁选 固体废物资源化 

分 类 号：X753[环境科学与工程—环境工程]