ASTM-D409 2008

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D409-08 Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method

Published By	Publication Date	Number of Pages
ASTM	2008	16

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Description

ASTM D409-08

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-μm (No. 16 × 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; Coal products; Grindability; Hardgrove machine method; Sieve analysis–coal/coke; Coal products; Grindability; Hardgrove machine method; Sieve analysis–coal/coke

ICS Code

ICS Number Code 73.040 (Coals)

DOI: 10.1520/D0409-08

PDF Catalog

PDF Pages	PDF Title
2	Scope Referenced Documents Significance and Use Apparatus
3	TABLE 1 Gross Samples Preparation of Test Samples
4	FIG. 1
5	Procedure Calculation and Report FIG. 2
6	FIG. 3
7	Precision and Bias Keywords A1. METHOD TO OBTAIN AND PREPARE INTERNATIONAL HGI STANDARD REFERENCE COAL SAMPLE FEEDSTOCK (HGI RM Feedstock) A1.1 Scope A1.2 Apparatus A1.3 HGI RM Feedstock Requirements TABLE 2
8	A1.4 Preparation of Each Candidate HGI RM A2. METHOD TO DIVIDE AND CONTAINERIZE CANDIDATE INTERNATIONAL HGI STANDARD REFERENCE COAL SAMPLES (Candidate HGI RMs) A2.1 Scope A2.2 Apparatus A2.3 Blending and Division of Each Feedstock
9	A3. METHOD FOR HOMOGENEITY TESTING OF CANDIDATE INTERNATIONAL HGI STANDARD REFERENCE COAL SAMPLES (Candidate HGI RMs) A3.1 Scope A3.2 Referenced Documents A3.3 Apparatus A3.4 Determination of the Homogeneity of Each of the Candidate HGI RM Lots
10	A4. METHOD FOR DETERMINING THE HARDGROVE GRINDABILITY INDEX TO BE ASSIGNED TO EACH LOT OF THE CANDIDATE INTERNATIONAL HGI STANDARD REFERENCE COAL SAMPLES (HGI RMs) A4.1 Scope A4.2 Apparatus A4.3 Determination of Grindability Index of Each Lot of Standard Reference Samples A5. CALIBRATION OF HARDGROVE MACHINE (HGI Machine) A5.1 Scope
11	A5.2 International HGI Standard Reference Coal Samples (HGI RMs) for Calibration7 A5.3 Apparatus A5.4 Calibration TABLE A5.1
12	A6. METHOD TO OBTAIN AND PREPARE NATIONAL HGI STANDARD REFERENCE COAL SAMPLE FEEDSTOCK (N HGI RM Feedstock) A6.1 Scope A6.2 A6.3 FIG. A5.1
13	A7. METHOD TO DIVIDE AND CONTAINERIZE CANDIDATE NATIONAL HGI STANDARD REFERENCE COAL SAMPLES (Candidate N HGI RMs) A7.1 Scope A7.2 A8. METHOD FOR HOMOGENEITY TESTING OF CANDIDATE NATIONAL HGI STANDARD REFERENCE COAL SAMPLES (Candidate N HGI RMs) A8.1 Scope A8.2 Referenced Documents A8.3 Apparatus A8.4 Determination of the Homogeneity of Each of the Candidate HGI RM Lots
14	A9. METHOD FOR DETERMINING THE HARDGROVE GRINDABILITY INDEX TO BE ASSIGNED TO EACH LOT OF THE CANDIDATE NATIONAL HGI STANDARD REFERENCE COAL SAMPLES (N HGI RMs) A9.1 Scope A9.2 Apparatus A9.3 Determination of Grindability Index of Each Lot of Standard Reference Samples
15	A10. CALIBRATION OF NATIONAL HARDGROVE MACHINES (N HGI Machine) A10.1 Scope A10.2 International HGI Standard Reference Coal Samples (HGI RMs) for Calibration9 A10.3 Apparatus A10.4 Calibration A10.5 Verification/Recalibration A11. METHOD FOR DETERMINING THE MOISTURE CONTENT OF THE 1.18 0.60 mm (No. 16 30) TEST SAMPLE (Moisture Content) A11.1 Scope A11.2 Apparatus
16	A11.3 Reagents A11.4 Moisture in the 1.18- 0.60-mm (No. 16 30) Test Sample A11.5 Calculation and Report

Additional information

Standard Title	D409-08 Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method
Published Code	ASTM
Publication Date	2008
Pages Count	16