{"id":106774,"date":"2024-10-18T14:34:42","date_gmt":"2024-10-18T14:34:42","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/astm-d409-2008\/"},"modified":"2024-10-24T21:38:00","modified_gmt":"2024-10-24T21:38:00","slug":"astm-d409-2008","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/astm\/astm-d409-2008\/","title":{"rendered":"ASTM-D409 2008"},"content":{"rendered":"

ASTM D409-08<\/h3>\n

Historical Standard: Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method<\/h4>\n
\n

ASTM D409<\/h4>\n

Scope<\/strong><\/p>\n

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)).<\/p>\n

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-\u03bc<\/span>m (No. 16 \u00d7<\/span> 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.<\/p>\n

1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses may be approximate.<\/p>\n

1.3 It is recognized that the term weight<\/span> is considered equivalent to mass<\/span> as used in this test method.<\/p>\n

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.<\/span><\/p>\n

Keywords<\/strong><\/p>\n

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<\/p>\n

ICS Code<\/strong><\/p>\n

ICS Number Code 73.040 (Coals)<\/p>\n

DOI:<\/strong> 10.1520\/D0409-08<\/p>\n<\/div>\n

PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
2<\/td>\nScope
Referenced Documents
Significance and Use
Apparatus <\/td>\n<\/tr>\n
3<\/td>\nTABLE 1
Gross Samples
Preparation of Test Samples <\/td>\n<\/tr>\n
4<\/td>\nFIG. 1 <\/td>\n<\/tr>\n
5<\/td>\nProcedure
Calculation and Report
FIG. 2 <\/td>\n<\/tr>\n
6<\/td>\nFIG. 3 <\/td>\n<\/tr>\n
7<\/td>\nPrecision 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 <\/td>\n<\/tr>\n
8<\/td>\nA1.4 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 <\/td>\n<\/tr>\n
9<\/td>\nA3. 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 <\/td>\n<\/tr>\n
10<\/td>\nA4. 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 <\/td>\n<\/tr>\n
11<\/td>\nA5.2 International HGI Standard Reference Coal Samples (HGI RMs) for Calibration7
A5.3 Apparatus
A5.4 Calibration
TABLE A5.1 <\/td>\n<\/tr>\n
12<\/td>\nA6. 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 <\/td>\n<\/tr>\n
13<\/td>\nA7. 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 <\/td>\n<\/tr>\n
14<\/td>\nA9. 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 <\/td>\n<\/tr>\n
15<\/td>\nA10. 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 <\/td>\n<\/tr>\n
16<\/td>\nA11.3 Reagents
A11.4 Moisture in the 1.18- 0.60-mm (No. 16 30) Test Sample
A11.5 Calculation and Report <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

D409-08 Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
ASTM<\/b><\/a><\/td>\n2008<\/td>\n16<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":106775,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2637],"product_tag":[],"class_list":{"0":"post-106774","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-astm","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/106774","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/106775"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=106774"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=106774"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=106774"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}