ASTM WK36006

    Work Item: ASTM WK36006 - Revision of D409 / D409M - 11 Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method

    (What is a Work Item?)

    Active Standard: D409 / D409M - 12

    Developed by Subcommittee: D05.07 | Committee D05 | Contact Staff Manager

    1. Rationale

    As recommended by producer of HGI SRMs, the requirement in A1.4.2.1 that: , 1 If, after air drying, a feedstock contains greater than 5 % undersize (3.35-mm) [-1/8 in.] or greater than 5 % oversize +63-mm [+2.5 in.], sieve the entire feedstock coal to remove the undersize or oversize. would cause a problem in that 80 and 100 HGI coals contain a significant fraction of -1/8, thereby increasing the amount of stock material by a factor of 4 (estimated). Currently the producer of HGI SRMs is NOT following A1.4.2.1.


    grindability; Hardgrove Grindability Index; HGI; pulverization; Sieve analysis--coal/coke; Coal products; Grindability; Hardgrove machine method;
    Citing ASTM Standards
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    Work Item Status

    Date Initiated:

    Technical Contact:
    Lee Rigsby

    Draft Under Development