ASTM-D409 2002

$40.63

D409-02 Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method

Published By	Publication Date	Number of Pages
ASTM	2002	9

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Category: ASTM

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Description

ASTM D409-02

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

ASTM D409

Scope

1.1 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)).

1.1.1 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. 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-mm by 600-m (No. 16 x No. 30) (see Test Method D 4749) 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.

1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses may be approximate.

1.3 It is recognized that the term weight is considered equivalent to mass as used in this test method.

1.4 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.

Keywords

grindability; Hardgrove-Grindability Index (HGI); pulverization

ICS Code

ICS Number Code 73.040 (Coals)

DOI: 10.1520/D0409-02

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Significance and Use Apparatus
3	Gross Samples Preparation of Test Samples FIG. 1
4	Calibration FIG. 2 TABLE 1
5	Procedure FIG. 3
6	Calculation and Report Precision and Bias Keywords TABLE 2
7	FIG. 4
8	A1. METHOD FOR PREPARING AND DETERMINING GRINDABILITY INDEXES OF PRIMARY HGI STANDARD REFERENCE SAMPLES A1.1 Scope A1.2 Apparatus A1.3 Standard Coals A1.4 Preparation of Standard Reference Samples A1.5 Determination of Grindability Index of Each Lot of Standard Reference Samples