YS/T 273.10-2006 English PDF (YST273.10-2006)

This Part specifies the method for determination of alumina content in cryolite. This Part applies to the determination of alumina content in cryolite. Determination range (mass fraction): ??5.00%. 2 Method summary The fluoride salt in the test portion is dissolved in hot aluminum chloride solution; but the free Al2O3 is not dissolved. After filtering, burn and weigh. 3 Reagents 3.1 Aluminum chloride solution (130 g/L); 3.2 Acetic acid solution (1+19); 3.3 Silver nitrate solution (10 g/L). 4 Apparatus 4.1 Platinum crucible: Top diameter is about 30 mm; bottom diameter is about 20 mm; height is about 35 mm. It is equipped with platinum lid. 4.2 High-temperature furnace: It can be controlled at 900??C??20??C. 5 Test sample The test sample shall comply with the requirements of 3.3 in YS/T 273.13. YS/T 273.10-2006 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 6 of 7 6 Analytical procedure 6.1 Test portion Weigh 0.5 g of dry test sample (5), accurate to 0.0001 g. 6.2 Number of determinations It shall make two determinations independently on the same test sample; shall take the average value. 6.3 Blank test Do a blank test along with the test po