Beneficiation of low grade graphite ore of eastern India by two-stage grinding and flotation

Vasumathi, N and Vijaya Kumar, T V and Nayak, B and Subba Rao, S and Prabhakar, S and Bhaskar Raju, G (2014) Beneficiation of low grade graphite ore of eastern India by two-stage grinding and flotation. Journal of Mining and Metallurgy Section A Mining, 50 A (1) . pp. 9-17.

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A low grade graphite run-of-mine (r.o.m) ore from eastern India was studied for its amenability to beneficiation by flotation technique. The petrography studies indicate that the ore primarily consists of quartz and graphite with minor quantity of mica. It analyzed 89.89% ash and 8.59% fixed carbon. The ore was crushed in stages followed by primary coarse wet grinding to 212 µm (d80). Rougher flotation was carried out in Denver flotation cell to eliminate gangue as much as possible in the form of primary tailings with minimal loss of carbon. Diesel & pine oil were used as collector and frother respectively. Regrinding of rougher concentrate to150 µm (d80) was resorted to further liberate the graphite values and was followed by multi-stage cleaning. This two-stage grinding approach involving a primary coarse grinding and regrinding of rougher float followed by its multi-stage cleaning was found to yield required grade of concentrate for applications such as refractories, batteries and high temperature lubricants. This approach is supposed to retain the flake size of coarse, free and liberated graphite, if available, during primary coarse grinding and rougher flotation stage with minimal grinding energy costs as against the usual practice of single stage grinding in the case of many ores. A final concentrate of 8.97% weight recovery with 5.80% ash and 92.13% fixed carbon could be achieved.

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:Low grade graphite, liberation, froth flotation, regrinding, refractory
Divisions:NML Chennai > Mineral Processing
ID Code:7182
Deposited By:Ms. N Vasumathi
Deposited On:19 Mar 2015 10:30
Last Modified:19 Mar 2015 10:30
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