JMMCE  Vol.11 No.10 , October 2012
Application of High Tension Roll Separator for the Separation of Titanium Bearing Minerals: Process Modeling and Optimization
ABSTRACT
The High Tension Roll Separator (HTRS) is one of the main electrostatic unit operations employed to separate titanium minerals like ilmenite, rutile and leucoxene which behave as conducting from zircon, sillimanite, garnet and monazite which behave as non-conducting minerals when a high potential difference is applied. Three process inputs, namely roll speed, feed material temperature and roll speed have been optimized. Experiments were conducted based on the Box- Behnken factorial design; the results were analyzed using response surface methodology (RSM). A new term, called Operational Quality Index (OQI) has been defined as a process output, which is maximized by quadratic programming, to obtain the optimum operating conditions. The maximum value of OQI obtained under the constraints of grade >96% and recovery >98% is 195.53, at the following operating conditions—Temperature: 102°C, Feed Rate: 1.75 tph and Roll Speed: 132 rpm. Under these conditions, the grade and recovery obtained are 96.6% and 98.9% respectively.

Cite this paper
S. Mohanan, S. Tripathy, Y. Ramamurthy and C. Kumar, "Application of High Tension Roll Separator for the Separation of Titanium Bearing Minerals: Process Modeling and Optimization," Journal of Minerals and Materials Characterization and Engineering, Vol. 11 No. 10, 2012, pp. 1005-1011. doi: 10.4236/jmmce.2012.1110103.
References
[1]   A. D. Dance and R. D. Morrison, “Quantifying a Black Art: The Electrostatic Separation of Mineral Sands,” Min- erals Engineering, Vol. 5, No. 7, 1992, pp.751-765. doi:10.1016/0892-6875(92)90244-4

[2]   J. Elder and E. Yan, “Newest Generation of Electrostatic Separator for the Minerals Sands Industry,” Heavy Min- erals 2003, South African Institute of Mining and Metal- lurgy, Johannesburg, pp. 63-70.

[3]   M. Ziemski and P. N. Holtham, “Particle Bed Charge Decay Behaviour under High Tension Roll Separation,” Minerals Engineering, Vol. 18, No. 15, 2005, pp. 5-14. doi:10.1016/j.mineng.2005.02.013

[4]   J. M. Lottering and C. Aldrich, “Online Measurement of Factors Influencing the Electrostatic Separation of Min- eral Sands,” The Journal of the South African Institute of Mining and Metallurgy, Vol. 106, 2006, pp. 283- 290.

[5]   E. G. Kelly and D. J. Spottiswood, “The Theory of Elec- trostatic Separations: A Review Part 1. Fundamentals,” Minerals Engineering, Vol. 2, No. 1, 1989, pp. 33-46. doi:10.1016/0892-6875(89)90063-0

[6]   N. Aslan, “Application of Response Surface Methodol- ogy and Central Composite Rotatable Design for Model- ing the Influence of Some Operating Variables of a Multi- Gravity Separator for Coal Cleaning,” Fuel, Vol. 86, No. 5-6, 2007, pp.769-776. doi:10.1016/j.fuel.2006.10.020

[7]   N. Aslan and Y. Cebeci, “Application of Box-Behnken Design and Response Surface Methodology for Modeling of Some Turkish Coals,” Fuel, Vol. 86, No. 1-2, 2007, pp. 90-97. doi:10.1016/j.fuel.2006.06.010

[8]   N. Aslan, “Modeling and Optimization of Multi Gravity Separator to Produce Celestite Concentrate,” Powder Technology, Vol. 174, No. 3, 2007, pp. 127-133. doi:10.1016/j.powtec.2007.01.007

[9]   M. Kincl, S. Turk and F. Vrecer, “Application of Experi- mental Design Methodology in Development and Opti- mization of Drug Release Method,” International Journal of Pharmaceutics, Vol. 291, No. 1-2, 2005, pp. 39-49. doi:10.1016/j.ijpharm.2004.07.041

[10]   Z. Xiao and A. Vien, “Experimental Designs for Precise Parameter Estimation for Non-Linear Models,” Minerals Engineering, Vol. 17, No. 3, 2004, pp. 431-436. doi:10.1016/j.mineng.2003.11.018

[11]   G. E. P. Box and D. W. Benhken, “Some New Three Level Designs for the Study of Quantitative Variables,” Technometrics, Vol. 2, 1960, pp. 455-475.

[12]   C. D. Montgomery, “Design and Analysis of Experi- ments,” John Wiley and Sons, Pte. Ltd, Singapore, 2001.

[13]   S. L. C. Ferreira, W. N. L. Santos, C. M. Quintella, B. B. Neto and J. M. Boque-Sendra, “Doehlert Matrix: A Che- mometric Toll for Analytical Chemistry Review,” Ta- lanta, Vol. 63, No. 4, 2004, pp. 1061-1067. doi:10.1016/j.talanta.2004.01.015

[14]   S. Souza Anderson, N. L. dos Santos Walter and L. C. Ferreira Sergio, “Application of Box-Behnken Design in the Optimization of an On-Line Pre-Concentration Sys- tem Using Knotted Reactor for Cadmium Determination by Flame Atomic Absorption Spectrometry,” Spectro- chimica Acta Part B, Vol. 60, No. 5, 2005, pp. 737-742. doi:10.1016/j.sab.2005.02.007

[15]   D. L. Massart, B. G. M Vandeginste, L. M. C. Buydens, S. D. Jong, P. J. Lewi and J. V. Smeyers, “Handbook of Chemometrics and Qualimetrics Part A,” Elsevier, Am- sterdam, 2003.

[16]   N. Kannan, A. Rajakumar and G. Rengasamy, “Optimi- zation of Process Parameters for Adsorption of Metal Ions on Straw Carbon by Using Response Surface Meth- odology,” Environmental Technology, Vol. 25, No. 5, 2004, pp. 513-522.

[17]   P. Rana, N. Mohan and C. Rajagopal, “Electrochemical Removal of Chromium from Wastewater by Using Carbon Aerogel Electrodes,” Water Research, Vol. 38, No. 12, 2004, pp. 2811-2820. doi:10.1016/j.watres.2004.02.029

[18]   G. Annadurai, S. S. Sung and D. L. Lee, “Optimization of Floc Characteristics for Treatment of Highly Turbid Wa- ter,” Separation Science and Technology, Vol. 39, No. 1, 2005, pp. 19-42. doi:10.1081/SS-120027399

[19]   C. Nilkuha, “The Examination of Some Aspects of High Tension Separation of Minerals,” MEngSc Thesis, Uni- versity of Melbourne, Melbourne, 1959.

[20]   D. M. Hopstock, “An Analysis of a Rotating-Drum-Type Electrostatic Separator,” Ph.D. Thesis, University of Min- nesota, Minnesota, 1972.

[21]   R. D. Morrison, “Mathematical Modeling of High Ten- sion Roll Separation,” Ph.D. Thesis, University of Queen- sland, Queensland, 1977.

[22]   J. S. Kwak, “Application of Taguchi and Response Surface Methodologies for Geometric Error in Surface Grinding Process,” International Journal of Machine Tools and Manufacture, Vol. 45, No. 3, 2005, pp. 327- 334. doi:10.1016/j.ijmachtools.2004.08.007

[23]   V. Gunaraj and N. Murugan, “Application of Response Surface Methodologies for Predicting Weld Base Quality in Submerged Arc Welding of Pipes, Journal of Materials Processing Technology, Vol. 88, No. 1-3, 1999, pp. 266- 275. doi:10.1016/S0924-0136(98)00405-1

[24]   C. R. Kumar, S. Tripathy and D. S.Rao, “Characterization and Pre-Concentration of Chromite Values from Plant Tailings Using Floatex Density Separator, Journal of Minerals and Materials Characterization and Engineer- ing, Vol. 8, No. 5, 2009, pp. 367-378

 
 
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