Title: Kinetics and sub sieve morphology of ball mill grinding for different grades of Indian coals

Authors: R. Keshav Johar; G. Saravanakumar; R. Krishna Prasad

Addresses: Department of Chemical Engineering and Materials Science, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Amrita University, Ettimadai, Coimbatore – 641 112, India ' Department of Chemical Engineering and Materials Science, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Amrita University, Ettimadai, Coimbatore – 641 112, India ' Department of Chemical Engineering and Materials Science, Center of Excellence in Advanced Materials and Green Technology, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Amrita University, Ettimadai, Coimbatore – 641 112, India

Abstract: The interactions of various factors affecting the ball mill grinding such as diameter of the ball, particle size and grinding time were studied. The kinetics of grinding on 80% passing size of product d₈₀ was studied for two grades of coal namely lignite and bituminous using Box-Behnken method of surface response experiment. The bond grindability index and work index of the ball mill were determined. The variation in specific rate of breakage with ball diameter and number of balls was studied. The study on power consumption was done by varying the number of balls, ball diameter and grinding time. It was observed that the breakage was better for more balls with increase in ball diameter. The sub sieve morphology of particles in sieve was analysed using scanning electron microscopic observations to determine the breakage characteristics. [Received: March 8, 2016; Accepted: July 17, 2016]

Keywords: ball mill; Box-Behnken; sub sieve morphology; specific rate of breakage.

DOI: 10.1504/IJOGCT.2018.090967

International Journal of Oil, Gas and Coal Technology, 2018 Vol.17 No.4, pp.458 - 471

Received: 26 Mar 2016
Accepted: 17 Jul 2016
Published online: 05 Apr 2018 *

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