【作者】 龚国华；

【导师】 余永富； 朱瀛波；

【作者基本信息】 武汉理工大学 ， 环境工程， 2004， 硕士

【摘要】 矿产资源是人类社会文明必须的物质基础，同时，矿产资源也是一种不可再生的自然资源，随着社会对矿产资源的需求量日益增大，矿产资源的开发、加工和使用过程不可避免地要破坏和改变自然环境，产生各种各样的废物和污染物质，造成大气、水体和土壤的污染，并给生态环境和人体健康带来直接和间接、近期或远期的、急性或慢性的不利影响。 我国是矿业生产大国，矿产资源总量比较丰富，但人均占有量不足世界平均水平的一半。经济发展与矿产资源供给之间的矛盾日益突出。目前，我国矿山排放的尾矿堆存量已达50余亿吨，并且每年以2～3亿吨的速度增长。因此，开展矿山固体废物的二次资源利用，实现固体废物资源化，将是解决资源短缺矛盾的有效途径。 目前，对矿山固体废物实现资源化尚处于探索时期，要真正在实际中得到应用，还需对之进行比较系统的研究。本文旨在将铁矿山尾矿资源化，针对铁矿山尾矿含铁量高，共生脉石复杂，经过强磁选后只可将铁品位富集到30％左右，采用目前已有的选矿工艺也无法将其铁品位再得到有效提高。根据该矿石粒细，主要成分为赤铁矿易于还原的特点，拟开发闪速还原焙烧新工艺对选矿厂低品位铁矿石进行铁金属的二次回收再利用，探索其回收利用的一般规律，以期为这一课题的进一步深入充奠基础。 本文对大冶铁矿低品位铁精矿进行了马弗炉、回转窑和沸腾炉的磁化焙烧试验研究，考查了磨矿细度、磁场强度、空气鼓入流量、焙烧温度、焙烧时间、煤粉粒度、煤粉含量以及煤种对铁精矿指标的影响。同时本文对磁化焙烧过程机理进行了探讨。 试验研究表明：通过马弗炉和回转窑进行磁化焙烧可以获得优质的铁精矿(TFe60％左右)。通过沸腾炉进行磁化焙烧，在磨矿细度为—0.074mm占90.48％，磁场强度为1.2A，空气鼓入流量为3m~3／h，煤粉粒度为—1mm，煤粉含量为13.04％，焙烧温度为850℃左右，焙烧时间为8min，以及选用固定碳含量高的煤种可以获得优质的铁精矿(TFe63％左右)。 本文对低品位铁精矿品位的提高进行了较系统的研究，取得了良好的试验结果。为低品位铁矿石的有效利用提供了新的技术路线，同时为我国钢铁企业的技术改造提供了依据，并能为矿山企业带来巨大的经济和社会效益。更多还原

【Abstract】 Mineral resource is the necessary material base of human social civilization. Meanwhile, it is not a kind of reborn natural resource. With the increasing of requirement for mineral resource by society, the exploitation, processing and use of mineral resource will destroy and alter natural environment inevitably and produce various waste and pollution, which pollutes atmosphere, water and soil and bring direct or indirect, present or future, acute or chronic effects to ecological environment and human health.China is a main mineral production nation. Although the gross of mineral resource is abundant in the world, the individual possessing is lower than half of world average. The conflict between economic development and supply of mineral resource is becoming more and more seriously. Presently, the amount of mine tailing has exceeded 5 billion ton in our country and the increasing speed is 20~30 million ton each year. Therefore, we should develop the recycling utilization of mine solid waste and turn it into resource radically, which will be an effective approach for the badly shortage of resource.At present, the work of turning mine solid waste into resource is being exploited. If it is applied in practice, the research should be done systematically. In this program, we aim.to turn iron mine tailing into resource due to its high content of iron and intricate commensal gangue, so it can only be enriched to 30% or so by high intensity magnetic separation. Moreover, the total content of iron can not be improved effectively by nowaday mineral processing technology. Because the particle size is extremely fine and the main content is hematite which can be reduced easily, the low grade iron of concentrate mill can be recycled and utilized by flash reduction roasting technology. We are seeking after its general law and looking forwarding to building up the base for the further research of the task.Using Daye Iron Mine low grade iron concentrate as test specimen, study on magnetization roasting was made systematically in Mafu furnace, rotary kiln and fluidized furnace. All kinds of factors affect iron concentrate index such as grinding granularity, magnetic field density, air flux, roasting temperature,roasting time, coal powder size, coal powder content and coal category was examined. The mechanism of magnetization roasting was also discussed in this paper.Study shows that excellent iron concentrate(TFe60% or so)can be obtained through magnetization roasting by Mafu furnace and rotary kiln. By fluidized furnace, when the grinding size(-0.074mm) is 90.48%, magnetic field density is 1.2A, air flux is 3m3/h, coal powder size is -1mm, coal powder content is 13.04%, roasting temperature is 850 C or so, roasting time is 8min and fixed carbon content of coal powder is high, we can obtained excellent iron concentrate(TFe63% or so).This paper studied systemically low grade concentrate and achieved good experimental results. The technology will provide new technological routine for making use of low grade iron and gist for technological modifying of iron and steel enterprise, which also can bring enormous economic and social benefit.更多还原