The Hardgrove Grindability Index (HGI) is a measure of coal's resistance to crushing. Grinding studies, and the resulting HGI, allow many different types of coal users to evaluate how coals will perform in their mills, allowing them to estimate grinding power requirements and throughput capacities.
Hardgrove Grindability of Coal. Part 1. Correlations with Composition, Structure, and Properties. Coke and Chemistry 62 (1):1-4. Authors: Denis Miroshnichenko. National Technical University...
The Hardgrove grindability index is used empirically to estimate the capacity and power consumption of a pulverizer, given a specified product fineness. 1 Scope. This International Standard specifies the method for determining the grindability index of hard coal using the Hardgrove machine.
In order to address the comminution behavior of rocks, mostly addressed index is HGI, i.e. Hardgrove Grindability Index. Although HGI is evaluated in most cases to understand coal comminution behavior by many researchers [ 12, 13, 19, 41, 50, 53, 63 ], still some other researchers [ 29, 51 ] have employed HGI in terms of carbonates …
Hardgrove Grindability. Hardgrove grindability is a measure of the relative ease with which a coal sample can be pulverized or ground to smaller sizes. All mined coals need to be ground to very small sizes (often powder size) before being utilized.
One of the parameters describing the energy input required for grinding is the Hardgrove index. This research was undertaken to determine the dependence of the Hardgrove grindability index on selected physicochemical properties of coal.
Hardgrove Grindability Index analysis is the ASTM method of determining the hardness of coal when pulverized for steam generation or size reduction. Grindabilities typically range on coal from 35 – 110. Harder and less grindable coal rates a smaller HGI index number.
Abstract. Grindability index of coal is an important technological parameter to understand the behaviour and assess the relative hardness of coals of varying ranks and grades during comminution.
This paper is concerned with the investigations to determine the usefulness of some rock index tests in assessing mechanical properties of coal and to determine whether there were significant...
The Hardgrove Grindability Index Standard Reference Sample (HGI-SRS) is a sample of coal used to calibrate instruments that are designed to determine the ease with which coal can be pulverized. The HGI value provides information for determining grinding power consumption and pulverizer capacities.
