This Standard specifies the requirements, test methods, inspection rules, marking, packaging, transportation, storage and order form (or contract) content of lepidolite concentrate. This Standard is applicable to lepidolite concentrate, which is obtained through mineral processing and enrichment. The product is for the purpose of extracting lithium and its compounds in the glass and ceramic industry, etc.
This Standard specifies the measurement principle, instrument requirements, test conditions, test procedures, and test report of the closed gas loop circulation method for measuring hydrogen content in liquid aluminum and aluminum alloys. This Standard applies to the determination of hydrogen content in liquid aluminum and aluminum alloys. 2 Measurement principle The closed gas loop circulation method uses a circulation system to promote the diffusion of hydrogen in the aluminum melt into a quantitative volume of inert gas, until the hydrogen partial pressure reaches equilibrium. It uses the thermal conductivity test principle to test the change in thermal conductivity of circulating gas due to hydrogen, and measure the partial pressure of hydrogen Pi. The calculation method of hydrogen content is as shown in formula (1): where: [H] - the hydrogen content, in cubic centimeter per 100 grams of aluminum (cm3/100 g Al); Pi - the hydrogen partial pressure, in kilopascal (kPa); K - the alloy correction coefficient, determined by referring to formula (2). The correction coefficient K of commonly used aluminum and aluminum alloys is shown in Table 1; S0 - the solubility of hydrogen in pure aluminum, which is a function of temperature, as shown in formula (3), in cubic centimeter per 100 grams of aluminum (cm3/100 g Al). YS/T 600-2009 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 5 of 8 where: Cu% - the percentage content of copper; Si% - the percentage content of silicon; Mg% - the percentage content of magnesium. where: T - the absolute temperature, in Kelvin (K). Table 1 No. Designation Correction coefficient YS/T 600-2009 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 6 of 8 Table 1 (continued) 3 Instrument requirements 3.1 Measurement principle: closed gas loop circulation method. 3.2 Measuring range: 0.01 cm3/100 g Al ~ 0.99 cm3/100 g Al. 3.3 Resolution: 0.001 cm3/100 g Al. 3.4 Accuracy: ¡À0.02 cm3/100 g Al (when the alloy correction...
This Standard specifies the terms and definitions, ordering information, classification and designation, dimensions, appearance and permissible deviation, technical requirements, test methods, inspection rules, packing, marking and quality certificate of stainless steel wires.
