Potential of High-Pressure Grinding Roll (HPGR) for Size Reduction of Hard Banded Iron Ore

Abstract

HPGR has been found to be efficient size reduction equipment compared to conventional size reduction equipments due to its potential processing benefits in terms of energy savings, improved exposure or liberation and particle weakening. The objective of the current work is to study the optimization of different process parameters during grinding. The HPGR is instrumented with load sensors, torque sensors and displacement sensor to measure the related data, i.e., applied load, torque generated, roll speed, specific energy consumption and roll gap in real-time basis with an on-line data acquisition system to capture and store the data in a computer for offline processing. The material used to optimize the process parameters is hard banded iron ore. In this study the second-order experimental planning, i.e., response surface methodology, was used. Accordingly, the experimental design was developed using the central composite design of the Design-Expert software.