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About This Item

 

Full Description

This test method covers the determination of the relative grindability or ease of pulverization of coals in comparison with coals chosen as standards. A prepared and sized sample receives a definite amount of grinding energy in a miniature pulverizer, and the size consist of the pulverized product is determined by sieving. The resultant size consist is used to produce an index relative to the ease of grinding [Hardgrove Grindability Index (HGI)].

Some coals, such as some high-volatile bituminous, subbituminous, and lignite coals, can undergo physical change as the natural or seam moisture is released during handling and preparation.
 

Document History

  1. ASTM D409/D409M-16


    Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method

    • Most Recent
  2. ASTM D409/D409M-12e1


    Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method

    • Historical Version
  3. ASTM D409/D409M-12

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    Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method

    • Historical Version
  4. ASTM D409/D409M-11ae1


    Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method

    • Historical Version
  5. ASTM D409/D409M-11a


    Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method

    • Historical Version
  6. ASTM D409/D409M-11


    Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method

    • Historical Version
  7. ASTM D409/D409M-09ae1


    Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method

    • Historical Version
  8. ASTM D409/D409M-09a


    Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method

    • Historical Version
  9. ASTM D409/D409M-09


    Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method

    • Historical Version
  10. ASTM D409-08


    Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method

    • Historical Version
  11. ASTM D409-02(2007)e1


    Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method

    • Historical Version
  12. ASTM D409-02e1


    Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method

    • Historical Version
  13. ASTM D409-02


    Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method

    • Historical Version