赤泥提铁研究进展
Research progress on iron recovery from red mud
孙涛涛 1荣嵘 2洪亚军 1朱美庆 1彭昌盛3
作者信息
- 1. 安徽工程大学化学与环境工程学院,安徽芜湖 241000
- 2. 中国海洋大学环境科学与工程学院,山东青岛 266100
- 3. 安徽工程大学化学与环境工程学院,安徽芜湖 241000;中国海洋大学环境科学与工程学院,山东青岛 266100
- 折叠
摘要
我国赤泥堆存量已超过10亿t,主要类型为拜耳法赤泥,该赤泥中含铁量高达30％以上,是经济价值较高的铁资源.目前回收赤泥中铁资源的方法主要是高温还原焙烧-磁选,还原剂以固态碳基还原剂和气基还原剂为主,需大量能耗和成本.我国是农业大国,主要农作物秸秆年产量在7亿t以上,这些生物质具有碳中性、反应活性高、灰分含量低、储量高、可再生等优点,而且热解温度远远低于固态碳质还原剂,其还原三价铁的温度仅为300～800 ℃,属于低温热解,采用生物质还原焙烧赤泥可大幅降低能耗和成本.本文重点对固态碳质还原剂、气基还原剂和生物质还原剂还原三价铁的参数进行对比,并详细阐述了生物质热解过程及还原赤泥中Fe2O3的机理,认为生物质还原焙烧-磁选技术可以实现赤泥和农业秸秆等固体废弃物的减量化和高值化利用,具有极高的经济价值和环境效益.最后对未来研究赤泥中铁资源回收提出以下建议:加强探究技术耦合实现赤泥产业化处置;回收利用生物质热解产气及热量;探究尾渣综合利用途径;增强对铁铝矿物的分离研究,以实现铁精矿的连续动态化生产.
Abstract
The stockpile of red mud in China has exceeded 1 billion tons,and the main type of red mud is Bayer method red mud,which contains iron up to 30％or more,and is an iron resource with high economic value.The current method of recovering iron resources in red mud is mainly high-temperature reduction roasting-magnetic separation,with solid carbon-based reductant and gas-based reductant as the main reductant,which requires a large amount of energy consumption and cost.China is a large agricultural country,the annual output of the main crop residues is 700 million t.These biomasses have the advantages of carbon neutrality,high reactivity,low ash content,high storage capacity,renewable,etc.,and the pyrolysis temperature is much lower than the solid carbonaceous reductant,and the temperature of its reduction of trivalent iron is only 300～800 ℃,which belongs to the low-temperature pyrolysis,so that the use of biomass reduction roasting of red mud can greatly reduce the energy consumption and cost.This paper focuses on the comparison of the parameters of trivalent iron reduction by solid carbonaceous reductant,gas-based reductant and biomass reductant,and elaborates in detail the pyrolysis process of biomass and the mechanism of reducing Fe2O3 in red mud,and concludes that the biomass reduction roasting-magnetic separation technology can realize the reduction and high-value utilization of solid wastes,such as red mud and agricultural straw,and has very high economic value and environmental benefits.Finally,the following suggestions are made for the future study of iron resource recovery in red mud:to strengthen the exploration of technology coupling to achieve the industrialized disposal of red mud;to recycle the gas and heat produced by the pyrolysis of biomass;to explore the ways to comprehensively utilize the tailing slag;and to enhance the research on the separation of iron and aluminum minerals in order to achieve the continuous and dynamic production of iron ore concentrates.
关键词
赤泥/生物质/低温热解/低温还原/高值化利用/铁资源回收/农业秸秆/固废协同处理Key words
red mud/biomass/low-temperature pyrolysis/low-temperature reduction/high-value utilization/iron resource recovery/agricultural straw/solid waste co-processing引用本文复制引用
基金项目
安徽工程大学引进人才科研启动基金(2022YQQ076)
出版年
2024
NETL
NSTL
万方数据