Effectiveness of sodium silicate as gangue depressants in iron ore slimes flotation

Rao, D S and Vijaya Kumar, T V and Subba Rao, S and Prabhakar, S and Bhaskar Raju, G (2011) Effectiveness of sodium silicate as gangue depressants in iron ore slimes flotation. International Journal of Minerals, Metallurgy and Materials, 18 ( 5). pp. 515-522.

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The recovery of iron from the screw classifier overflow slimes by direct flotation was studied. The relative effectiveness of sodium silicates with different silica-to-soda mole ratios as depressants for silica and silicate bearing minerals was investigated. Silica-to-soda mole ratio and silicate dosage were found to have significant effect on the separation efficiency. The results show that an increase of Fe content in the concentrate is observed with concomitant reduction in SiO2 and Al2O3 levels when a particular type of sodium silicate at a proper dosage is used. The concentrate of 58.89wt% Fe, 4.68wt% SiO2, and 5.28wt% Al2O3 with the weight recovery of 38.74% and the metal recovery of 41.13% can be obtained from the iron ore slimes with 54.44wt% Fe, 6.72wt% SiO2, and 6.80wt% Al2O3, when Na2SiO3 with a silica-to-soda mole ratio of 2.19 is used as a depressant at a feed rate of 0.2 kg/t.

Item Type:Article
Official URL/DOI:DOI: 10.1007/s12613-011-0471-4
Uncontrolled Keywords:iron ores; sodium silicate; depressants; flotation
Divisions:NML Chennai > Mineral Processing
ID Code:4102
Deposited By:Dr. G Bhaskar Raju
Deposited On:12 Oct 2011 10:23
Last Modified:21 Nov 2011 17:25
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