ASTM D409/D409M-12

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

ASTM International , 10/01/2012

Publisher: ASTM

File Format: PDF

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Description

Standard By:ASTM International , 10/01/2012

Published:10/01/2012

Pages:15

File Size:1 file , 550 KB

Language:English

Note:This product is unavailable in Russia, Ukraine, Belarus

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.