Friday, 5 December 2008

Slon Magnetic Separators Applied to Beneficiate Low Grade Oxidized Iron Ores

D. H. Xiong

SLon Magnetic Separator Ltd, Ganzhou, China

Email: xdh@slon.com.cn




ABSTRACT


Low grade oxidized iron ores are usually not economic to utilize. However, the development of SLon magnetic separators and other new technologies make the process cost lower and lower. In this paper, several low-grade oxidized iron ore process flowsheets are introduced. The key procedure is that at the early stage, SLon magnetic separators are applied to discharge as more tails as possible with very low cost, only a small portion of rough concentrate going to the cleaning stage, showing the new technologies are profitable for such iron ores.



Keywords: SLon magnetic separator, Oxidized iron ore, Magnetic separation, iron ore



INTRODUCTION


Most Chinese iron ores deposits are very poor. The grades of some of them are lower than 30%Fe. In recent years, Chinese iron and steel industry develops rapidly and consumes huge amounts of iron concentrate. The facing problem for iron mining and processing industry is that the production scale is getting bigger and bigger, but the feeding grade is getting lower and lower. To solve this problem, the most important technologies of SLon vertical ring and pulsating high gradient magnetic separators (Xiong, Liu and Chen, 1998) and reverse flotation are widely applied in oxidized iron ore processing industry. Now many low grade oxidized iron ores can be utilized economically (Xiong, 1997, 2003, 2006).



SLON APPLIED IN HU JIA MIAO IRON ORE PROCESSING PLANT


Hu Jia Miao iron ore processing plant was built in 2006. It belongs to Anshan Iron and Steel Company. It treats 8 minion low-grade oxidized iron ore annually. 8 SLon-2000 middle intensity magnetic separators (SLon MIMS) and 8 SLon-2000 vertical-ring and pulsating high gradient magnetic separators (SLon VP HGMS) are applied in this plant.



The characterization of the ore


The ore consists of magnetite, mag-hematite and hematite. The main gang mineral is quartz. The assay, mineralogical composition, particle size distribution and particle size liberation are shown in Table 1, Table 2, Table 3 and Table 4, respectively.



Table 1 Assay of Ru Jia Miao iron ore (%)





Table 2 Mineralogical compositions of Ru Jia Miao iron ore (%)





Table 3 Particle crystal size distributions of Ru Jia Miao iron ore





Table 4 Particle size liberation of Ru Jia Miao iron ore




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