Beneficiation of Low Grade Limestone from Madukkarai, Coimbatore District, Tamil Nadu, India
International Journal of Mineral Processing and Extractive Metallurgy
Volume 2, Issue 1, January 2017, Pages: 1-6
Received: Aug. 29, 2016; Accepted: Sep. 10, 2016; Published: Apr. 22, 2017
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Authors
B. P. Ravi, Mineral Processing Department, VSKU PG Centre, Nandihalli, Sandur, India
S. J. G. Krishna, Mineral Processing Department, VSKU PG Centre, Nandihalli, Sandur, India
M. R. Patil, Mineral Processing Department, VSKU PG Centre, Nandihalli, Sandur, India
C. Rudrappa, Mineral Processing Department, VSKU PG Centre, Nandihalli, Sandur, India
P. S. Kumar, Mineral Processing Department, VSKU PG Centre, Nandihalli, Sandur, India
V. Rampur, Mineral Processing Department, VSKU PG Centre, Nandihalli, Sandur, India
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Abstract
A low grade Limestone from ACC mines, Madukkarai, Coimbatore district, Tamil Nadu, India, was subjected to beneficiation by cationic reverse flotation process with the aim of producing cement grade and metallurgical grade concentrates. The low grade limestone analyzed 43% CaO, 76%TC, 18% SiO2, 1.3% MgO, 1.30% Fe2O3, 2.50% Al2O3, 0.33% alkalis and 36.00% LOI. It contained mainly calcite and quartz which were mutually intergrown with fair degree of liberation at 65 mesh size. Reverse cationic flotation was preferred to direct soap flotation, as practiced in beneficiation plant at Madukkarai. Inverse flotation studies were carried out to float siliceous impurities using cationic collectors varying collector type, collector dosage, mesh of grind and pulp density. Cement grade composite concentrate ( non-float and slimes) assaying 9.51% AI, 90% Total carbonates at wt.% yield of 88 by a process comprising of grinding to MOG D80 400 microns, desliming/ screening over 400 mesh, rougher conditioning with 0.4kg/t SOKEM565C for 2minutes at 50%S, rougher flotation for 4 minutes, at pH 8 and 28% S. The float sand fraction assaying 80.30% AI, 18% total carbonates may be used as eco sand. On the contrary, premium metallurgical grade concentrate assaying 54.64% CaO, 0.6% SiO2, 0.7% MgO, 1.4% Fe2O3, 0.7% Al2O3, 41.0% LOI with weight% yield of 55.2, could be produced at 20% solids, MOG D80 400 microns, and pH 8 with 1.0 kg /t of SOKEM 565 C. The evolved nil waste process is stable, selective, and easily adaptable in the existing anionic soap direct flotation plant at ACC Madukkarai cement works, yielding valuable products.
Keywords
Flotation, Cationic Collectors, Limestone Flotation, Cement and Metallurgical Grades
To cite this article
B. P. Ravi, S. J. G. Krishna, M. R. Patil, C. Rudrappa, P. S. Kumar, V. Rampur, Beneficiation of Low Grade Limestone from Madukkarai, Coimbatore District, Tamil Nadu, India, International Journal of Mineral Processing and Extractive Metallurgy. Vol. 2, No. 1, 2017, pp. 1-6. doi: 10.11648/j.ijmpem.20170201.11
Copyright
Copyright © 2017 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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