SN/T 2763.3-2012 PDF EnglishUS$185.00 · In stock · Download in 9 seconds
SN/T 2763.3-2012: Chemical analysis of nickel laterite ore - Part 3: Determination of total iron content - Titanium (III) chloride reduction methods Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsSN/T 2763.3-2012: Chemical analysis of nickel laterite ore - Part 3: Determination of total iron content - Titanium (III) chloride reduction methods---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/SNT2763.3-2012 SN ENTRY & EXIT INSPECTION & QUARANTINE STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA Chemical analysis of nickel laterite ore - Part 3: Determination of total iron content - Titanium (III) chloride reduction methods ISSUED ON: MAY 07, 2012 IMPLEMENTED ON: NOVEMBER 16, 2012 Issued by: General Administration of Quality Supervision Inspection and Quarantine of PRC Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Principles ... 4 4 Reagent ... 5 5 Instrument ... 6 6 Specimen ... 6 7 Analytical procedures ... 6 8 Calculation of analysis results ... 8 9 Repeatability and reproducibility ... 9 Appendix A (Normative) Determination of wet moisture content in nickel laterite ore - Gravimetric method ... 10 Chemical analysis of nickel laterite ore - Part 3: Determination of total iron content - Titanium (III) chloride reduction methods1 ScopeThis part of SN/T 2763 specifies a method for the determination of total iron content in nickel laterite ore by the titanium (III) chloride reduction method. This section applies to the determination of total iron content in nickel laterite ore. Measuring range (mass fraction) is: 9% ~ 50%.2 Normative referencesThe following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard. GB/T 6379.2 Accuracy (trueness and precision) of measurement methods and results - Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method (ISO 5725-2) GB/T 6682 Water for analytical laboratory use - Specification and test methods GB/T 12805 Laboratory glassware - Burettes GB/T 12806 Laboratory glassware - One-mark volumetric flasks GB/T 12808 Laboratory glassware - One-mark pipettes3 PrinciplesThe specimen is melted with sodium peroxide at 800 °C and leached with hydrochloric acid. After the stannous chloride is reduced, sodium tungstate is used as an indicator and titanium trichloride is used to reduce the remaining high-valent iron to a low price to produce "tungsten blue"; then potassium dichromate is used to oxidize until the blue disappears; sulfur and phosphorus At the same time, weigh the sample and determine the wet moisture content in accordance with Appendix A. 7.3 Determination 7.3.1 Decomposition of sample Place the sample (7.2) in a 30 mL corundum crucible. Add 4 g of sodium peroxide (4.1). Mix it uniformly. Cover it. Bake it on an electric stove until the sodium peroxide turns black. Then place it in a high-temperature furnace at 800 °C to melt for 15 minutes. Take it out to cool it. Place it in a 400 mL beaker. Add 40 mL of warm water to soak the crucible. Add 30 mL of hydrochloric acid (4.3). Boil it slightly for about 5 minutes to drive off the hydrogen peroxide. Cool it down. Heat at low temperature to dissolve the sample. Use hot water to wash out the crucible. Adjust the volume of the solution to 150 mL. Add stannous chloride (4.8) dropwise to light yellow. Remove it. Use running water to cool it to room temperature. 7.3.2 Titration Add 15 drops of sodium tungstate (4.9). Use titanium trichloride (4.11) to titrate it until it turns blue. Then add potassium dichromate standard solution (4.14) until colorless. Immediately add 10 mL of sulfur phosphorus mixed acid (4.10), 3 drops of sodium diphenylamine sulfonate solution (4.12). When the content is 9% ~ 30%, use potassium dichromate standard solution (4.14) to titrate to a stable purple. When the content is 30% ~ 50%, use potassium dichromate standard solution (4.15) to titrate to a stable purple. Since the specimen contains a certain amount of chromium, the tungsten blue will fade and show a light green background. When adjusting the tungsten blue, it shall carefully observe the fading situation of the tungsten blue; pay attention to distinguish the background color from the fading of tungsten blue. 7.4 Blank test Use the same amount of reagent (no sample added) to decompose the blank test in accordance with 7.3.1. The titration is carried out according to 7.3.2. Before adding the sulfur-phosphorus mixed acid, add 10 mL of ferrous ammonium sulfate solution (4.13). After the titration, record the consumption of potassium dichromate solution in milliliters (A); then add 10 mL of ammonium ferrous sulfate solution (4.13). After titration, record the consumption of potassium dichromate solution in milliliters (B), then V0 = A - B is the blank value. The concentration of the potassium dichromate standard solution shall be consistent with the concentration of the standard solution used in the determination of samples according to 7.3.2.Appendix A(Normative) Determination of wet moisture content in nickel laterite ore - Gravimetric method A.1 Scope This Appendix specifies the gravimetric method for the determination of wet moisture content in analytical samples of nickel laterite ore. This Appendix is applicable to the determination of moisture content of analytical samples of nickel laterite ore. A.2 Principles The sample that has been air-dried under laboratory conditions is dried to a constant weight in a drying oven at 105 °C ~ 110 °C. The mass change before and after drying is the mass of the wet moisture. A.3 Instrument A.3.1 Weighing bottle, the diameter is not less than 5 cm; it is equipped with a tightly sealed ground cap. A.3.2 Drying box, which can maintain the temperature in the range of 105 °C ~ 110 °C. A.4 Analytical procedures A.4.1 Sample Pre-dry the weighing bottle (A.3.1) in a drying oven (A.3.2) at 105 °C ~ 110 °C. Weigh it. Weigh 1 g of the sample that has been pre-dried in the air into the weighing bottle, accurate to 0.0002 g. Spread it flat in the weighing bottle. A.4.2 Determination Place the open weighing bottle containing the sample (A.4.1) and bottle cap in a drying oven (A.3.2) that has been stabilized at 105 °C ~ 110 °C. Dry it for 1 hour. Take it out. Immediately cover the ground cap. Put it in a desiccator to cool for 20 min ~ 30 min. Take out the weighing bottle from the desiccator. Gently open the ground cap. Then quickly close it. Weigh it. Repeat the drying (30 min each time), cooling and weighing operations, until the difference between two consecutive weighing does not exceed 0.005 g. If ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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