By Tao Jiang, Jiann-Yang Hwang, Patrick Masset, Onuralp Yucel, Rafael Padilla, Guifeng Zhou
Proceedings of a symposium subsidized by means of the Pyrometallurgy Committee and the strength Committee of the Extraction and Processing department of TMS (The Minerals, Metals & fabrics Society)
Held throughout the TMS 2012 Annual assembly & Exhibition Orlando, Florida, USA
March 11-15, 2012
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Extra resources for 3rd International Symposium on High-Temperature Metallurgical Processing
In recent years with the iron ore prices soaring, significant progress was made in mineral processing research of limonite. Laboratory research and industrial test results showed that flocculation-desliming-flotation process and roasting-magnetic separation process are the two best methods to recover limonite till now. To compare these two methods, roasting-magnetic separation process is superior to flocculation-desliming-flotation process in aspects of beneficiation indexes and industrial stability.
Metallic and slag phases were obtained after smelting. Slags were discarded and grinded. Magneticmetallic and non-magnetic parts of the slags were separated by using magnetic separation process. Magnetic parts were added to the metallic phase to re-melt. General flowchart of the process is shown in Figure 2. The homogenized metal buttons were characterized using XRF, AAS, EPMA techniques. The most efficient experiment in recovery of Ni and Co was P4 mixture with 30 g reductant and 100 g ore. 19 Figure 2.
It can be used for high iron limonitic ores and tolerates more Mg than other acid leaching processes. In this process, ore is blended and dried, then reduced in a roaster by using fuel and air around 700 °C. The product is generally iron-nickel alloy. Hot and reduced ore is cooled in a roaster under reducing atmosphere and quench in ammoniacal ammonium carbonate solution in the tanks. Nickel and Co are precipitated as carbonate form from solution. The recovery is lower compared to pyrometallurgical and hydrometallurgical processes.