BS ISO 562:2010 pdf download – Hard coal and coke — Determination of volatile matter

BS ISO 562:2010 pdf download – Hard coal and coke — Determination of volatile matter 1 Scope This International Standard specifies a method of determining the volatile matter of hard coal and of coke. lt isnot applicable to brown coals and lignites. 2 Normative references The following referenced documents are indispensable for the application of this document.For datedreferences,only the edition cited applies. For undated references， the latest edition of the referenceddocument (including any amendments) applies. ISo 687, Solid mineral fuels — Coke —Determination of moisture in the general analysis test sample ISO11722,Solid mineral fuels —Hard coal—Determination of moisture in the general analysis test sampleby drying in nitrogen 3Principle A portion of the sample is heated out of contact with air at 900 °C for 7 min. The percentage mass fraction ofvolatile matter is calculated from the loss in mass of the test portion after deducting the loss in mass due tomoisture. 4Reagents and materials 4.1Cyclohexane, of recognized analytical grade. 5 Apparatus 5.1 Furnace，heated by electricity，in which a zone of uniform temperature of 900 “C±5 °C can bemaintained. lt may be of the stop-ended type or fitted at the back with a flue approximately 25 mm in diameter and150 mm long (see Figure 1). lt is important for furnaces with flues that the furnace door seal well. The flue should not reach far out of theoven and should be fitted with a butterfly valve to restrict airflow through the furnace. lts heat capacity shall be such that,with an initial temperature of 9o0 °C, the temperature is regained within4 min after insertion of a cold stand and its crucibles. The temperature is measured with a thermocouple (5.2). Normally, the furnace is designed specifically either for multiple determinations using a number of crucibles inone stand or for receiving one crucible and its stand. In the first case, the zone of uniform temperature shall beat least 160 mm x 100 mm; in the latter case, a zone with a diameter of 40 mm is sufficient. A position for the crucible stand shall be chosen within the zone of uniform temperature and this position shall be used for all determinations. The temperature of 900 °C shall be attained as closely as possible with a specified tolerance of ±5 °C in order to compensate for inherent errors in the temperature measurement and lack of uniformity in the temperature distribution. 5.2 Thermocouple, unsheathed, of wire no thicker...