Coke hardness testing device

[calvin gao]

During the last refcomm conference Evan Hyde mentioned there is a coke hardness testing device from the mining industry that can be used to test DCU coke hardness. Could someone provide a bit more detail? I would like to purchase one. Thank you!

[Mike Kimbrell]

The test for coke hardness is Hardgrove Grindability Index or HGI. The test method is ASTM D5003. It is the same method for testing the grindability of coal which is covered in test ASTM D409.

The test uses a crushed sample of petroleum coke and then screens that sample for a particular size. That is put into the Hardgrove machine that is a ball mill and run 60 revolutions. The amount of 75 micron and smaller particles is weighed and then a chart is used to determine the HGI of the petroleum coke. Smaller numbers mean harder coke. Coke with an HGI of less than 30 is difficult to sell as it is too hard to grind without special equipment. Coke with an HGI of 40 or less can be sold but sometimes at a discount due to the hardness. An HGI of 80 or higher is very soft coke.

[tommeek]

SGS
RELATED SERVICES & RESOURCES
HARDGROVE GRINDABILITY INDEX (HGI)
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.

SGS is a world leader in coal and coke testing services. Our coal testing
procedures are completed globally by technical experts in state-of-the-art
facilities. SGS testing results are returned in a timely manner and comply with
ASTM, ISO and other international standards.

HGI is determined through a multi-step procedure:
A 50-gram sample of prepared coal that is uniform in size is placed
inside a grinding unit

1. The unit undergoes a standard number of revolutions under a specified
pressure
2. Steel balls within the unit crush the coke sample
3. The coal fines are sorted and the quantity of coke less than a specified
size is recorded and converted into a Hardgrove Grindability Index
(HGI) value
4. Typical resulting HGI values lie between 30 (increased resistance to
pulverization) and 100 (more easily pulverized). Experienced SGS technicians ensure your HGI testing is completed promptly and in accordance with global industry standards. Rely on the SGS global team for the results that allow you to make accurate estimations of the power requirements and throughput capacities in your facilities, leading to optimized plant operation and an improved bottom line.
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