ASTM D5003 Standard Test Method for Hardgrove Grindability Index (HGI) of Petroleum Coke
1. Scope
1.1 This test method covers the determination of the hardgrove grindability index (HGI) of those petroleum cokes that contain no dedusting additive. The procedure for this test method is the same as in Test Method D409. Sections of this test method contain the significance and use of the HGI of petroleum coke, preliminary sample preparation procedures, and procedure and precision and bias data specific to petroleum coke.
NOTE 1 - The size consistency (particle size distribution) of fluid petroleum coke is generally 100 % passing a 6.73 mm (No. 3) sieve and greater than 80 % passing a 2.00 mm (No. 10) sieve. Much of fluid cokes will pass a 0.59 mm (No. 30) sieve. Because ofthis fineness the HGI value is related to the coarser particles in fluid coke and large samples are required to prepare sufficient material of the correct particle size for Test Method D409.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.2.1 Exception - Hardgrove grindability index is unitless.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
D409 Test Method for Grindability of Coal by the Hardgrove-Machine Method
D4930 Test Method for Dust Control Material on Calcined Petroleum Coke
3. Terminology
3.1 Definitions:
3.1.1 calcined petroleum coke, n - petroleum coke that has been thermally treated to drive off the volatile matter and to develop crystalline structure.
3.1.2 fluid coke, n - petroleum coke with a granular, microscopic layered structure resulting from injection of petroleum feedstock into a flowing, loose bed of coke particles.
3.1.3 Hardgrove Grindability Index, HGI, unitless, n - in petroleum coke technology, measurement ofthe relative ease of pulverizing a raw petroleum coke or green petroleum coke in comparison with coal standards. The higher the HGI value, the easier the petroleum coke is to grind.
3.1.4 petroleum coke, n - solid, carbonaceous residue produced by thermal decomposition of heavy petroleum fractions or cracked stocks, or both.
3.1.5 raw petroleum coke, n - petroleum coke that has not been calcined.
