YS/T 273.2-2006 English PDF (YST273.2-2006)

This Part specifies the method for determination of cryolite ignition loss. This Part applies to the determination of cryolite ignition loss. Determination range: ??6.00%. 2 Method summary The sample is burned at 550 ??C??5 ??C for 30 minutes. The amount of mass reduction after burning is the ignition loss. 3 Apparatus 3.1 High-temperature furnace: The temperature can be controlled at 550 ??C??5 ??C. 3.2 Platinum crucible: The diameter is 30 mm, the height is 40 mm, and it has a lid. 4 Test sample The sample shall comply with the requirements of 3.2 in YS/T 273.13. 5 Analysis procedure 5.1 Test portion Weigh 2.5 g of dry test sample (4), accurate to 0.0001 g. 5.2 Number of determinations Two determinations shall be carried out independently and the average value shall be taken. 5.3 Determination 5.3.1 Turn on the high-temperature furnace (3.1), adjust the furnace temperature to YS/T 273.2-2006 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery Page 6 of 7 550 ??C??5 ??C, and start the determination after the temperature remains constant for 20 minutes. 5.3.2 According to the requirements of 5.1, accurately weigh the test porti