1.1 This test method covers the procedure for determination of Air-Dry Loss in coal reduced to 2.36-mm (No. 8 Sieve) topsize by microwave oven. Coals subjected to this test method may be used for determination of other test parameters. However, this test method shall not be construed as the referee method. For referee purposes, users of this test method are referred to Test Method D3302. It is recognized that this test method does not work for all coals, especially coals containing pyrites. 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. 1.2.The values stated in SI units are to be regarded as 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 safety and health practices and determine the applicability of regulatory limitations prior to use.
The measurement of air-dry loss is required to determine Total Moisture which is used to determine whether coal meets commercial or environmental specifications, or both. Within the limitations prescribed in the scope, this test method describes a procedure for determination of air-dry loss that requires less time than the procedures described in Method D3302. The standard is available to producers, sellers and consumers as an alternative method of determination when accelerated analysis is required. Use of this standard test method shall be mutually agreed upon by all involved parties. Microwave air-drying is an alterative to the conventional air-drying process in D 3302 for coals that oxidize easily.
Keywordstotal moisture; microwave air-drying
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Draft Under Development