Study On Treating Low Grade Iron Concentrate Of High Intensity Magnetic Separation Of Daye Iron Mine By Flash Magnetization Roasting

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.