ASTM-D409 2011

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D409/D409M-11 Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method

Published By	Publication Date	Number of Pages
ASTM	2011	14

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Description

ASTM D409/D409M-11

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

ASTM D409/D409M

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 × 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.

1.2 The 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.

1.3 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; Sieve analysis–coal/coke; Coal products; Grindability; Hardgrove machine method

ICS Code

ICS Number Code 73.040 (Coals)

DOI: 10.1520/D0409_D0409M-11

PDF Catalog

PDF Pages	PDF Title
1	Scope
2	Referenced Documents Significance and Use Apparatus TABLE 1
3	Gross Samples Preparation of Test Samples
4	Procedure FIG. 1
5	Calculation and Report FIG. 2
6	Precision and Bias FIG. 3 TABLE 2
7	Keywords A1. METHOD TO OBTAIN AND PREPARE HGI REFERENCE MATERIAL FEEDSTOCK (HGI RM Feedstock) A1.1 Scope A1.2 Apparatus A1.3 HGI RM Feedstock Requirements A1.4 Preparation of Each Candidate HGI RM
8	A2. METHOD TO DIVIDE AND CONTAINERIZE CANDIDATE HGI REFERENCE MATERIALS (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 HGI REFERENCE MATERIALS (Candidate HGI RMs) A3.1 Scope A3.2 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 HGI REFERENCE MATERIALS (HGI RMs) A4.1 Scope A4.2 Apparatus A4.3 Determination of Grindability Index of Each Lot of HGI Reference Materials
11	A5. CALIBRATION OF HARDGROVE MACHINE (HGI Machine) A5.1 Scope A5.2 HGI Reference Materials (HGI RMs) for Calibration5 A5.3 Apparatus A5.4 Calibration TABLE A5.1
12	A5.5 Verification/Recalibration FIG. A5.1
13	A6. METHOD FOR DETERMINING THE MOISTURE CONTENT OF THE 1.18 0.60 mm (No. 16 30) TEST SAMPLE (Moisture Content) A6.1 Scope A6.2 Apparatus A6.3 Reagents A6.4 Moisture in the 1.18 0.60-mm (No. 16 30) Test Sample A6.5 Calculation and Report

Additional information

Standard Title	D409/D409M-11 Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method
Published Code	ASTM
Publication Date	2011
Pages Count	14