{"id":106782,"date":"2024-10-18T14:34:51","date_gmt":"2024-10-18T14:34:51","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/astm-d409-2002-2\/"},"modified":"2024-10-24T21:38:00","modified_gmt":"2024-10-24T21:38:00","slug":"astm-d409-2002-2","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/astm\/astm-d409-2002-2\/","title":{"rendered":"ASTM-D409 2002"},"content":{"rendered":"
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-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.<\/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<\/i> is considered equivalent to mass 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.<\/i><\/p>\n Keywords<\/strong><\/p>\n grindability; Hardgrove-Grindability Index (HGI); pulverization<\/p>\n ICS Code<\/strong><\/p>\n ICS Number Code 73.040 (Coals)<\/p>\n DOI:<\/strong> 10.1520\/D0409-02<\/p>\n<\/div>\n D409-02 Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method<\/b><\/p>\nPDF Catalog<\/h4>\n
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\n PDF Pages<\/th>\n PDF Title<\/th>\n<\/tr>\n \n 1<\/td>\n Scope
Referenced Documents
Significance and Use
Apparatus <\/td>\n<\/tr>\n\n 3<\/td>\n Gross Samples
Preparation of Test Samples
FIG. 1 <\/td>\n<\/tr>\n\n 4<\/td>\n Calibration
FIG. 2
TABLE 1 <\/td>\n<\/tr>\n\n 5<\/td>\n Procedure
FIG. 3 <\/td>\n<\/tr>\n\n 6<\/td>\n Calculation and Report
Precision and Bias
Keywords
TABLE 2 <\/td>\n<\/tr>\n\n 7<\/td>\n FIG. 4 <\/td>\n<\/tr>\n \n 8<\/td>\n 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 <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n ASTM<\/b><\/a><\/td>\n 2002<\/td>\n 9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":106783,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2637],"product_tag":[],"class_list":{"0":"post-106782","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\/106782","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\/106783"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=106782"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=106782"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=106782"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}