Innovative Flotation Routes in an Iron Ore Concentrator
This investigation addressed two products from Samarcos desliming circuit,namely underflow of cleaning cyclones and underflow of desliming cyclones.The roughing cyclones receive the product of the grinding circuit.The underflow of the roughing cyclones feeds the cleaning cyclones and the overflow feeds the desliming cyclones.The underflows of cleaning and roughing cyclones are combined to constitute the feed of the flotation circuit.These fractions were characterized and a new process route was proposed.The size distributions of the two fractions are quite different. The desliming cyclones underflow presents higher amount of material passing 37 μm and of ultrafines as compared with the cleaning cyclones underflow.Laboratory scale flotation tests were performed in a mechanical machine aiming at comparing the performances of these products in the presence of the reagents employed in the concentrator.Pilot scale column flotation yielded enhanced iron recoveries for both products in comparison with those achieved in laboratory mechanical cells,without impairing the concentrate quality.The increase in recovery was more significant in the case of the cleaning cyclones underflow.These results suggest the use of columns in the flotation of this product aiming at increasing the overall iron recovery.Nevertheless the results also showed that the use of columns to float the cleaning cyclones underflow should also be taken into consideration.Despite the fact that this product requires a longer residence time in order that the required silica content in the concentrate is achieved,the indication is that higher levels of iron recoveries might be reached.The conclusion is that,due to the different behaviors of the two products,they should be processed in distinct circuits to maximize the iron recovery.
Iron ore flotation Cationic flotation Column flotation
A.E.C.Peres P.S.Mapa
Department of Metallurgical and Materials Engineering,UFMG Federal University of Minas Gerais,MG,Bra Samarco Minera(ca)o SA - Mina do Oermano,MG,Brazil
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
4205-4210
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）