1.1 This practice covers an accelerated procedure for the determination of Air-Dry Loss in coal, reduced to 2.36-mm (No. 8 Sieve) topsize, by microwave oven. Coals subjected to this practice may be used for determining other test parameters. However, it shall not be construed as a referee method. For referee purposes, users are referred to Test Method D3302. 1.2. It is recognized that this standard practice does not work for all coals, especially coals containing pyritic material. If arcing, ash formation, fire or other anomalies occur and persist after multiple time and power adjustments, the coal is not appropriate for microwave use. 1.3. The values stated in SI units are to be regarded as the standard. 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 safety and health practices and determine the applicability of regulatory limitations prior to use.
The determination of air-dry loss is required, not only to determine total moisture, but also to dry coal samples sufficiently for analysis. This practice describes a procedure for the determination of air-dry loss that requires less time than traditional procedures. Laboratories, especially those located on mine sites, will find this particularly useful when accelerated analysis times are required. Using this practice, one can quickly determine whether a coal meets commercial or environmental specifications, or both.
Keywordstotal moisture; microwave air-drying, sample drying, accelerated procedure, coal
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top