Dahongshan Tailings Iron Minerals Comprehensive Recovery

In recent years, with the fast development of China's economic construction, the steel industry is always been well developed. The proportion of the iron tailings in solid and liquid industrial wastes is increasing. A large number of tailing wastes not only waste a lot of land and resources, they also bring the serious pollution to the human's life and even break the ecological balance. The issues of the tailings have already aroused the public concern.Mean-while, with the over-exploitation of the iron mine, the iron ore resources in our country are increasingly limited and the iron ore grade continuing decrease, which cause the imbalance of supply and demand in our country. However, tailings as the secondary energy resource which contain the valuable element are more and more important in the world. Therefore, starting with the practica-1 use of tailings resources and strengthening the comprehensive use of the tailings res-ources can make a double development of resources exploitation and saving. That not only increase the utilization ratio of resources, it also solve the tailings processing pr-oblems. And it has an very important economic and social significance.The research object of this report is the mixed tailings in Dahongshan factory. The iron grade in study sample is 13.86%, the originally ore losing at the high temperature is 5.5%. The The sample is mainly made up of feldspar,chlorite,isinglass,quartz,dolomite,garnet and a few magnetite and siderite. Except the magnetite has low degree of dissociation and has a lot of intergrowth a, other iron have a better degree of dissociation situation. Most iron exist in chlorite,mica and other gangue mineral. And a few iron exist in oxid and carbonate. irst, we use the magnetic sparation to deal with the ore to reduce the following processing volume, improve the selected grade and reduce the cost. Finally, we chose the 1/2 medium for magnetic selct,under the magnetic intensity is 600mT to do the examination of magnetic selct,after a series of conditioning tests. And the result is that the grade of the concentrated ore of magnetic selct is 18.80%, the rate of concentrate is 52.10%, recovery is 70.66%, the iron grade of taillings is 8.49% and has reached a better magnetic selct effect.second, I have done the exploratory experiment in retrieving the magnetite and the experiment in high intensity magnetic roughing-grinding-low intensity magnetic.we choose the 1/2 medium for magnetic selct,The intensity magnetic field is 400mT, the grinding fineness 95.02% for the-200, the magnetic intensity is 50mT, and finally we come up with result is that the grade of iron concentrate is 61.39% and the recovery is 9.01%.third, I have studied the experimentation of mill run to siderite.First opposite floatation biotite beforehand, then put up the floatation flow to retrieve siderite and get the iron concentrated,which grade is 34.54%, rate of production is 4.12%,rate of recovery is 7.57%. By analyzing the component of concentrated,we find that the content of silicate ore is fewer, such as biotite,garnet. However, the content of tourmaline and ankerite are more. The content of siderite and magnetite in iron concentrated is about 73%, and the content of siderite is 70%. According to the result of analyse of technics and mineral, the lowest grade of siderite, depend on the research by MLA the grad of iorn in the siderite is 13.00% and the highest grade is 39.68%,such as Ca,Mg,Mn metal hydronium in the low degree of isomorphism, therefore, the grade of iron concentrated is hard to improve.this report studied the siderite and magnetite intailings of Dahongshan. It examined the character and mineral constitute of iron ore and found the possibility by floatation of iron in tailings which has a higher grade. This report provides theoretical and practical references for exploiting and using tailings in other areas.