Research On Separation Technology Of Jilin Linjiang Iron-manganese Ore

Since 1996, the steel output of China is always most in the world. With the rapid development of steel industrial production, it is caused that violent increase of demand and production of iron ores, and demand of iron ores exceeds supply. From 2003, China becomes most country for import quantity of iron ores, the import quantity of iron ores is as high as 383 millions tons in 2007. The price of import iron ores rise 65% again in 2008, which makes the high price of iron ores rise substantially again. Although some related macro-control policies were enacted by the government to restrain exceed rapid development of partial professions and slows down the increase of steel production, however with upgrade of consumed structure of resident and development of industrialization and urbanization, the demand for steel product will still increase continuously, steel industry will still be developed continuously, the situation that the iron ores relies on importing in large quantities is hard to get torsion in short period.The high quality resource of iron ores is gradually exhausted in China, in addition of the price of iron ores rise substantially, so we have to develop potential iron ores resource with strategic and foresighted vision. The major characteristic of the iron ores of China is "poor", "fine" and "miscellaneous", average iron grade is 32% and lower 11 percents than world average iron grade, the iron ores of the 97.5% need be handled by mineral processing, and the proportion of complex hematite which hard to separated is greater (20.8% of iron ores reserves). Therefore, it is particularly important to develop the crucial technology of mineral processing for low grade iron ores hard to be separated.With Jilin Linjiang iron-manganese ore(namely Jilin antelope iron ore) as research object, on the foundation of systematic technology mineralogy research, the effect of various testing conditions on separation results of the iron-manganese ore had been studied systematicly with various technology, such as direct flotation, reverse flotation, magnetic separation, roast-magnetic separation, and so on. The roast-magnetic separation conditions have been researched emphatically, such as matnetizing roast temperature, roast size, roast time, the kind and adding quantity of reductant, and so on. The study results show, direct and reverse flotation test effect of Linjiang iron-manganese ore aren't so good, iron minerals aren't separated effectively, and the iron concentrate that accords with quality requirement can be got by roast-magnetic separation technology, that is said, roast-magnetic separation technology is most effective process to separate Linjiang iron-manganese ore, when matnetizing roast temperature is 750℃-800℃, roast time is 40-120 min, the concentrate of 67% Fe grade can be got; With secondly bituminite of Hebei Fongning coal mine as reductant, suitable add quantity of coal is 8%, the concentrate of over 58% Fe grade and 70% recovery can be got. The results of classification roast test show, the separation results of 56.32% grade,96% recovery can be got by roasting of coarse size ore (-20mm+12mm), the roast-magnetic separation of coarse size ore is better than middle and fine size ore, the roast of coarse size ore is suitable for Linjiang iron-manganese ore.Above-mentioned research results provide reference basis for making use of Jilin Linjiang iron-manganese ore efficiently and reasonably,.