Study on the Separation Characteristics of Iron Ore Containing Carbonate
With increasing of mining depth, many iron ores in Liaoning Province contain carbonates such as siderite and ankerite. The emergence of these carbonates in ores creates a fatal impact on the running producing process of anionic reverse flotation in Dong Anshan Sintering Plant, which leads to concentrate and tailing no separated. And its reason is still unknown. Moreover, siderite, despite that its ferric theoretic grade is only 48.2%, however, do not affect the blast furnace utilization factor,therefore, can be used as raw materials in ironmaking.In order to solve the separate problem of iron ore containing carbonates, five pure minerals, martite, magnetite, quartz, siderite and ankerite, were selected for a series single flotation experiment.The aim was to discover the flotation difference of these minerals, furthermore, to explore a new flow sheet for the iron ore containing carbonates.The results of single mineral flotation experiment reveal that the combination regulators, starch and CaCl2, in different pH extent, can make these minerals taking on obvious flotation difference,which make it possible to process the iron ore containing carbonates.A new flow sheet, step-flotation, to process iron ore containing carbonates is explored, that is,first step, direct-flotation processing, is to eliminate the bad effect that the carbonates bring in flotation system by collecting carbonates under neutral condition; the second step, reverse-flotation processing, is to get qualified iron concentrate by collecting quartz under alkaline condition.Manual mixed ore sample were processed successfully through this new flowsheet under proper reagent system, which has absolute advantage compared with routine flowsheet. Actual ore sample of compound magnetic separation concentrate were processed successfully both open and closed circuit experiment through this new flowsheet.SEM and EDS were used to probe the reason why carbonates affect the regular processing. It is analyzed that moderate floatability of siderite and its coating on the surface of hematite and quartz make the phenomenon concentrate and tailing no separated.This research provides a reasonable processing scheme for iron ores containing carbonates and can be used for reference in processing other complicated, refractory iron ore.
Step-flotation Refractory iron ore Siderite Hematite
W. Z. Yin M. Zhang M. B. Liu Y. Z. Ding Y. Q. Ma S. B. Zhang Y. J. Li Y. X. Han
Northeastern University, Shenyang, China
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
962-970
2008-09-24(万方平台首次上网日期,不代表论文的发表时间)