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YS/T 254.1-2011 PDF in English


YS/T 254.1-2011 (YS/T254.1-2011, YST 254.1-2011, YST254.1-2011)
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YS/T 254.1-2011English130 Add to Cart 0-9 seconds. Auto-delivery. Methods for chemical analysis of beryllium concentrate and beryl. Part 1: Determination of beryllium oxide content. Phosphate gravimetry Valid
YS/T 254.1-1994English199 Add to Cart 2 days Methods for chemical analysis of beryllium concentrates-beryl The phosphate gravimetric method for the determination of beryllium oxide content Obsolete
Standards related to (historical): YS/T 254.1-2011
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YS/T 254.1-2011: PDF in English (YST 254.1-2011)

YS/T 254.1-2011 YS NONFERROUS METAL INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 73.060 D 43 Replacing YS/T 254.1-1994 Methods for chemical analysis of beryllium concentrate and beryl - Part 1: Determination of beryllium oxide content - Phosphate gravimetry ISSUED ON: DECEMBER 20, 2011 IMPLEMENTED ON: JULY 01, 2012 Issued by: Ministry of Industry and Information Technology of the People's Republic of China Table of Contents Foreword ... 3 1 Scope ... 5 2 Method summary ... 5 3 Reagents ... 5 4 Specimen ... 6 5 Analysis steps ... 6 6 Calculation and presentation of analysis results ... 7 7 Precision ... 8 8 Quality assurance and control ... 9 Methods for chemical analysis of beryllium concentrate and beryl - Part 1: Determination of beryllium oxide content - Phosphate gravimetry 1 Scope This Part of YS/T 254 specifies the method for determining the content of beryllium oxide in beryllium concentrate and beryl. This Part is applicable to the determination of beryllium oxide in beryllium concentrate and beryl. The determination range is 6.00%~14.00%. 2 Method summary The test material is melted with potassium hydrofluoride. Beryllium is converted into beryllium fluoride salt. After sulfuric acid fumes and melts, it is converted into beryllium sulfate. Leach with water. Acidify with hydrochloric acid. Use hydrogen peroxide and disodium ethylenediaminetetraacetate to complex impurity elements. In the presence of ammonium acetate, diammonium hydrogen phosphate is used to precipitate beryllium twice at a pH value of 5.2~5.8. The precipitate is burned into beryllium pyrophosphate at 1000°C. Weigh to constant. 3 Reagents 3.1 Potassium hydrofluoride. 3.2 Sulfuric acid (ρ1.84 g/mL). 3.3 Hydrochloric acid (ρ1.19 g/mL). 3.4 Hydrogen peroxide (ρ1.10 g/mL). 3.5 Ammonia (ρ0.90 g/mL). 3.6 Hydrochloric acid solution (1+3). 3.7 Ammonia (1+1). 3.8 Diammonium hydrogen phosphate solution (132.5 g/L): Weigh 132.5 g of diammonium hydrogen phosphate. Dissolve in 500 mL of water. Filter. Transfer to a 5.3.3 Move the platinum dish into a 700°C high temperature furnace. Melt it until it becomes transparent. Take out. Cool down. 5.3.4 Wipe the outer wall of the platinum dish. Dip the melt into a 400 mL beaker with hot water. Add 5 mL of hydrochloric acid (3.3). Heat and boil to make the solution clear. 5.3.5 Add 3 mL of hydrogen peroxide (3.4), 10 mL of disodium ethylenediaminetetraacetate solution (3.9), and 8 mL of diammonium hydrogen phosphate solution (3.8) into the beaker. Neutralize with ammonia water (3.5) until obvious precipitation appears. Slowly add 20 mL of ammonium acetate solution (3.10) while stirring. Heat and boil for 2 min ~ 3 min. 5.3.6 Place the beaker in a boiling water bath to keep it warm. Convert the precipitate into crystalline precipitate. Cool down. Leave for more than 4 h. 5.3.7 Filter with slow quantitative filter paper. Wash the beaker and sediment 4~5 times with hot ammonium nitrate solution (3.11). 5.3.8 Use 20 mL of hot hydrochloric acid solution (3.6) to dissolve the precipitate from the funnel into the original beaker. Wash the filter paper several times with hot water. Dilute the solution with water to a volume of approximately 100 mL. 5.3.9 Add 1 mL of hydrogen peroxide (3.4), 5 mL of disodium ethylenediaminetetraacetate solution (3.9), and 4 mL of diammonium hydrogen phosphate solution (3.8) into the beaker. Neutralize with ammonia water (3.5) until obvious precipitation appears. Slowly add 20 mL of ammonium acetate solution (3.10) while stirring. Heat and boil for 2 min ~ 3 min. 5.3.10 Place the beaker in a boiling water bath to keep it warm. Convert the precipitate into crystalline precipitate. Cool down. Leave for more than 4 h. 5.3.11 Filter with slow quantitative filter paper. Wipe the beaker clean with half a piece of filter paper. Wash with hot ammonium nitrate solution (3.11) until there is no chloride ion [check with silver nitrate (3.12)]. 5.3.12 Place the precipitate together with the filter paper in a constant weight crucible (porcelain or corundum). Carefully dry and ashes. Place it in a high temperature furnace of 1000℃ and burn it for 2 h. Take out. Cool slightly. Place in a desiccator to cool to room temperature. Weigh. Then put the crucible into a high temperature furnace of 1000℃. Burn it for 1 h. take out. Cool slightly and then place in a desiccator to cool to room temperature. Weigh to constant. 6 Calculation and presentation of analysis results The content of beryllium oxide is calculated as the mass fraction of beryllium oxide wBeO. Values are expressed in %. Calculate according to formula (1): ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.