Ys T 581 2 2006 Translated English Of Chinese Standard Yst581 2 2006
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YS/T 581.2-2006 Translated English of Chinese Standard (YST581.2-2006) by https://www.chinesestandard.net Pdf
These rules are applicable to the qualification examination of special equipment operators (including safety management personnel), within the scope of the "Classification and Projects for Qualification Recognition of Special Equipment Operators", which was formulated AND issued by the State Administration for Market Regulation.
YS/T 273.2-2006 Translated English of Chinese Standard (YS/T 273.2-2006, YST273.2-2006) by https://www.chinesestandard.net Pdf
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
YS/T 273.12-2006 Translated English of Chinese Standard (YS/T 273.12-2006, YST273.12-2006) by https://www.chinesestandard.net Pdf
This Part specifies the method for determination of calcium oxide content in cryolite. This Part applies to the determination of calcium oxide in cryolite. Determination range (mass fraction): ??1.25%. 2 Method summary Use perchloric acid to de-fluorinate the test portion; heat until the smoke of perchloric acid has evaporated, then use hydro
YS/T 273.10-2006 Translated English of Chinese Standard (YS/T 273.10-2006, YST273.10-2006) by https://www.chinesestandard.net Pdf
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