1.1 本试验方法 2. 涵盖了与标准煤相比，煤的相对可磨性或粉碎难易程度的测定。制备并定尺寸的样品在微型粉碎机中接收一定量的研磨能量，通过筛分确定粉碎产品的尺寸。所得粒度组成用于产生与研磨难易程度相关的指数[Hardgrove可磨性指数（HGI）]。 1.1.1 一些煤，如一些高挥发性烟煤、次烟煤和褐煤，在处理和制备过程中，随着天然或煤层水分的释放，可能会发生物理变化。 这种变化通常足以改变实验室测试时报告的可磨性特征，并可能根据干燥条件和1.18×0.60 mm（编号16×30）的含水量产生不同的指标（见试验方法 D4749 )用于测试的材料。因此，本试验方法中引用的重复性和再现性可能不适用于这些高挥发性烟煤、次烟煤和褐煤。 1.2 以国际单位制或英寸-磅单位表示的值应单独视为标准值。每个系统中所述的值可能不是完全等效的；因此，每个系统都应独立使用。 将两个系统的值结合起来可能会导致不符合标准。 1.3 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 =====意义和用途====== 3.1 该试验方法开发了一种研磨或粉碎特性的测量方法，可用于评估研磨或粉碎过程中所需的产量或能量输入，或两者兼而有之，这可能会影响各种过程，包括燃烧、炼焦、液化和气化。

1.1 This test method 2 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 3.1 This test method develops a measurement of grinding or pulverizing characteristics that can be used to evaluate the yield, or energy input, or both, required in a grinding or pulverizing process, which can impact a wide variety of processes, including combustion, coke-making, liquefaction, and gasification.