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

International Journal of Minerals,Metallurgy and Materials 2011年第5期18卷 515-522页

作者： Danda Srinivas Rao Tadiparthi Venkata VijayaKumar Sripada Subba Rao swarna prabhakar Guntamadugu Bhaskar Raju National Metallurgical Laboratory-Madras Centre Council of Scientific and Industrial Research-Madras ComplexChennai 600 113India

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 A1203 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% A1203 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% A1203, when NazSiO3 with a silica-to-soda mole ratio of 2.19 is used as a depressant at a feed rate of 0.2 kg/t.

关键词： iron ores sodium silicate depressants flotation

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Beneficiation of a low grade limestone sample

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Mining Science and Technology 2011年第5期21卷 631-636页

作者： Rao Danda Srinivas Vijayakumar Tadiparthi Venkata Subba Rao Sripada Bhaskar Raju Guntamadugu prabhakar swarna National Metallurgical Laboratory Madras Centre CSIR Madras Complex Chennai 600 113 India

Pilot scale column flotation studies were conducted on a low grade siliceous limestone ore. Silica content was reduced to less than 1% in the concentrate so that it became satisfactory for use in the paper or rub- ber industries. The limestone sample was crystalline and constituted primarily of calcite that contained quartz, feldspar, pyroxene, and biotite as gangue minerals. Quartz is the major silicate gangue whereas feldspar, pyroxene, and biotite exist in minor to trace quantities. Traces of pyrite were also observed within the sample. A reverse flotation process was adopted where the silicate gangue minerals were floated using two different commercial cationic collectors: Chem-750 F or Floatamine-D. The studies clearly suggest it is possible to produce a limestone concentrate assaying around 96-97% CaCO3 contain- ing less than 1% SiO2. The effect of feed flow rate, percent solids, froth depth, and wash water on the grade and recovery of the CaCO3 concentrate is discussed.

关键词：低品位石灰石样品选矿二氧化硅含量精矿品位脉石矿物反浮选工艺 CaC03

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