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

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

01-09-2016

Publisher

American Society for Testing and Materials

1.1 This test method2 covers the determination of the relative grindability or ease of pulverization of coals in comparison with coals chosen as standards.

1.1This test method2 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)].

1.1.1Some 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. This change is often sufficient to alter the grindability characteristics that will be reported when tested in the laboratory and could produce different indices dependent on the conditions of drying and the moisture level of the 1.18 × 0.60 mm (No. 16 × 30) (see Test Method D4749) materials used for the test. Therefore, the repeatability and reproducibility cited in this test method may not apply for these high-volatile bituminous, subbituminous, and lignite coals.

1.2The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

1.3This 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.

Committee	D 05
DocumentType	Test Method
Pages	15
PublisherName	American Society for Testing and Materials
Status	Current
Supersedes	ASTM D 409/D409M : 2012 : EDT 1 ASTM D 409/D409M : 2012

ASTM D 7430 : 2010	Standard Practice for Mechanical Sampling of Coal
ASTM E 11 : 2020	Standard Specification for Woven Wire Test Sieve Cloth and Test Sieves
ASTM D 7430 : 2012 : REV A	Standard Practice for Mechanical Sampling of Coal
ASTM D 6708 : 2018	Standard Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material
ASTM D 6708 : 2015	Standard Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material
ASTM D 6708 : 2013	Standard Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material
ASTM D 7430 : 2012 : REV B	Standard Practice for Mechanical Sampling of Coal
ASTM D 6883 : 2003 : REV A	Standard Practice for Manual Sampling of Stationary Coal from Railroad Cars, Barges, Trucks, or Stockpiles
ASTM D 6708 : 2007	Standard Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material
ASTM D 3302 : 2007 : EDT 1	Standard Test Method for Total Moisture in Coal
ASTM D 6609 : 2017	Standard Guide for Part-Stream Sampling of Coal
ASTM D 6708 : 2016 : REV B	Standard Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material
ASTM D 6883 : 2017	Standard Practice for Manual Sampling of Stationary Coal from Railroad Cars, Barges, Trucks, or Stockpiles
ASTM D 2013 : 2000 : REV A : EDT 1	Standard Practice of Preparing Coal Samples for Analysis
ASTM D 6708 : 2006	Standard Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material
ASTM D 3302 : 2002 : REV A	Standard Test Method for Total Moisture in Coal
ASTM D 7430 : 2009	Standard Practice for Mechanical Sampling of Coal
ASTM D 3302 : 2002	Standard Test Method for Total Moisture in Coal
ASTM D 2013 : 2000 : REV A	Standard Practice of Preparing Coal Samples for Analysis
ASTM D 6883 : 2003	Standard Practice for Manual Sampling of Stationary Coal from Railroad Cars, Barges, Trucks, or Stockpiles
ASTM D 7430 : 2016	Standard Practice for Mechanical Sampling of Coal
ASTM D 7430 : 2013	Standard Practice for Mechanical Sampling of Coal
ASTM D 3302 : 1991	Standard Test Method for Total Moisture in Coal
ASTM D 6708 : 2024	Standard Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material
ASTM D 6708 : 2004	Standard Practice for Statistical Assessment and Improvement of the Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material
ASTM D 4749 : 1987 : R2007	Standard Test Method for Performing the Sieve Analysis of Coal and Designating Coal Size
ASTM D 2013 : 2000	Standard Practice of Preparing Coal Samples for Analysis
ASTM D 6708 : 2019	Standard Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material
ASTM D 6708 : 2016 : REV A	Standard Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material
ASTM D 6708 : 2008	Standard Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material
ASTM D 6609 : 2008	Standard Guide for Part-Stream Sampling of Coal
ASTM E 11 : 2022	Standard Specification for Woven Wire Test Sieve Cloth and Test Sieves
ASTM D 2234/D2234M : 2009	Standard Practice for Collection of a Gross Sample of Coal
ASTM D 7430 : 2016 : REV A	Standard Practice for Mechanical Sampling of Coal
ASTM D 6708 : 2001	Standard Practice for Statistical Assessment and Improvement of the Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material
ASTM D 3302 : 2000	Standard Test Method for Total Moisture in Coal
ASTM D 6883 : 2004 : R2012	Standard Practice for Manual Sampling of Stationary Coal from Railroad Cars, Barges, Trucks, or Stockpiles
ASTM D 6708 : 2021	Standard Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material
ASTM D 7430 : 2010 : REV A	Standard Practice for Mechanical Sampling of Coal
ASTM D 7430 : 2011	Standard Practice for Mechanical Sampling of Coal
ASTM D 6609 : 2001	Standard Guide for Part-Stream Sampling of Coal
ASTM D 6708 : 2001 : EDT 1	Standard Practice for Statistical Assessment and Improvement of the Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material
ASTM D 7430 : 2017	Standard Practice for Mechanical Sampling of Coal
ASTM D 6708 : 2005	Standard Practice for Statistical Assessment and Improvement of the Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material
ASTM D 7430 : 2012	Standard Practice for Mechanical Sampling of Coal
ASTM D 6609 : 2000	Standard Guide for Part-Stream Sampling of Coal
ASTM D 6708 : 2013 : EDT 1	Standard Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material
ASTM D 6609 : 2008 : R2015	Standard Guide for Part-Stream Sampling of Coal
ASTM D 6708 : 2016	Standard Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material
ASTM D 2013 : 2003	Standard Practice of Preparing Coal Samples for Analysis
ASTM D 7430 : 2008 : REV A	Standard Practice for Mechanical Sampling of Coal
ASTM D 3302 : 2007	Standard Test Method for Total Moisture in Coal
ASTM D 7430 : 2018 : REV A	Standard Practice for Mechanical Sampling of Coal
ASTM D 4749 : 1987 : R1994 : EDT 1	Standard Test Method for Performing the Sieve Analysis of Coal and Designating Coal Size
ASTM D 2013 : 2004	Standard Practice of Preparing Coal Samples for Analysis
ASTM D 7430 : 2016 : REV B	Standard Practice for Mechanical Sampling of Coal
ASTM D 6708 : 2019 : REV A	Standard Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material
ASTM D 2013 : 2001	Standard Practice of Preparing Coal Samples for Analysis
ASTM D 6609 : 2007	Standard Guide for Part-Stream Sampling of Coal
ASTM D 7430 : 2014	Standard Practice for Mechanical Sampling of Coal
ASTM D 4749 : 1987 : R2012	Standard Test Method for Performing the Sieve Analysis of Coal and Designating Coal Size
ASTM D 3302 : 2005	Standard Test Method for Total Moisture in Coal
ASTM D 3302 : 2002 : REV A : EDT 1	Standard Test Method for Total Moisture in Coal
ASTM D 7430 : 2015 : REV A	Standard Practice for Mechanical Sampling of Coal
ASTM D 7430 : 2015	Standard Practice for Mechanical Sampling of Coal
ASTM D 7430 : 2016 : REV B : EDT 1	Standard Practice for Mechanical Sampling of Coal
ASTM D 2013 : 1972	Standard Method Of Preparing Coal Samples For Analysis
ASTM D 7430 : 2011 : REV A : EDT 1	Standard Practice for Mechanical Sampling of Coal
ASTM D 2013 : 2007	Standard Practice for Preparing Coal Samples for Analysis
ASTM D 7430 : 2018 : REV A : EDT 1	Standard Practice for Mechanical Sampling of Coal
ASTM D 7430 : 2008 : REV A : EDT 1	Standard Practice for Mechanical Sampling of Coal
ASTM D 6883 : 2004	Standard Practice for Manual Sampling of Stationary Coal from Railroad Cars, Barges, Trucks, or Stockpiles
ASTM D 3302 : 2005 : EDT 1	Standard Test Method for Total Moisture in Coal
ASTM D 4749 : 1987	Standard Test Method for Performing the Sieve Analysis of Coal and Designating Coal Size
ASTM D 6708 : 2019 : REV A : EDT 1	Standard Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material
ASTM D 7430 : 2008	Standard Practice for Mechanical Sampling of Coal
ASTM D 7430 : 2010 : REV B	Standard Practice for Mechanical Sampling of Coal
ASTM D 7430 : 2011 : REV A	Standard Practice for Mechanical Sampling of Coal
ASTM D 7430 : 2018	Standard Practice for Mechanical Sampling of Coal
ASTM D 7430 : 2015 : REV B	Standard Practice for Mechanical Sampling of Coal
ASTM D 4749 : 1987 : R2002	Standard Test Method for Performing the Sieve Analysis of Coal and Designating Coal Size
ASTM D 3302 : 2007 : REV A	Standard Test Method for Total Moisture in Coal
ASTM D 3302 : 2007 : REV A : EDT 1	Standard Test Method for Total Moisture in Coal