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GB/T 2566-2010: Determination of transmittance for low rank coal Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 2566: Historical versions
GB/T 2566-2010: Determination of transmittance for low rank coal---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/GBT2566-2010GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 73.040 D 21 Replacing GB/T 2566-1955 Determination of transmittance for low rank coal Issued on. SEPTEMBER 26, 2010 Implemented on. FEBRUARY 01, 2011 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 1 Scope... 4 2 Method principle... 4 3 Reagents and materials... 4 4 Instruments and apparatuses... 5 5 Determination procedure... 6 6 Expression of determination results... 7 7 Precision... 7 Annex A (Informative) Potassium dichromate standard series solution... 8 Annex B (Informative) Original record of transmittance determination... 12ForewordThis Standard replaces GB/T 2566-1995 “Determination of transmittance for low rank coal”. Compared with GB/T 2566-1995, this Standard has mainly made the following modifications. - According to the requirements of GB/T 1.1, MODIFY the format of the standard accordingly; - REORGANIZE relevant clauses of the standard; - ADD Table A.2 in Annex A; - ADJUST repeatability and reproducibility values for different transmittance ranges (see Clause 7). Annex A and Annex B of this Standard are informative annexes. This Standard was proposed by China Coal Industry Association. This Standard is under the jurisdiction of National Technical Committee on Coal of Standardization Administration of China. Drafting organization of this Standard. China Coal Research Institute Beijing Coal Chemical Research Branch, Hebei Coal Geological Institute. Main drafters of this Standard. Liu Shuyun, Song Shuanchen, Luo Yunfei, Zhang Lusuo. The historical editions of the standard replaced by this Standard are. - GB 2566-1981; - GB/T 2566-1995. Determination of transmittance for low rank coal1 ScopeThis Standard specifies the reagents and materials, instruments and equipment used to determine the transmittance of low rank coal, as well as determination procedure, expression and precision of determination results. This Standard applies to lignite and low rank bituminous coal.2 Method principleLow rank coal reacts with mixed acid of nitric acid and phosphoric acid under the specified test conditions and produces a colored solution. According to the color depth of the solution, use potassium dichromate solution with different concentrations as the standard, determine the transmittance of the coal sample by visual colorimetry.3 Reagents and materials3.1 10 % sulfuric acid (GB/T 625, chemically pure) solution (volume fraction). 3.2 Potassium dichromate (GB/T 642, analytically pure). Before use, it shall be dried at 110 °C ~ 120 °C for 2 h. 3.3 (1 + 9) phosphoric acid (GB/T 1282, chemically pure) solution (volume fraction). 3.4 Nitric acid (GB/T 626, chemically pure). Yellow nitric acid cannot be used. 3.5 Mixed acid. Prepared by mixing 1 volume of nitric acid, 1 volume of phosphoric acid and 9 volumes of distilled water. 3.6 Potassium dichromate preparation solution 3.7 Potassium dichromate standard series solution USE 1 mL, 2 mL, 5 mL, or 10 mL straight pipette (or microtiter) with fine marks to pipette the required volume of preparation solution from potassium dichromate preparation solution (3.6.1 and 3.6.2) in sequence, PLACE in 50 mL volumetric flasks, USE 10 % sulfuric acid solution (3.1) to dilute to the mark, to prepare standard series solution, SHAKE well for use. Annex A provides the correspondence between the concentration of the standard solution prepared and the volume of the potassium dichromate preparation solution required.4 Instruments and apparatuses4.1 Analytical balance. with a sensitivity of 0.000 2 g. 4.2 Colorimetric tube. 25 mL, internal diameter 17 mm ± 0.5 mm, scaled at 10 mL, with tight stopper. 4.4 Mercury thermometer. The measuring range is 0 °C ~ 100 °C, and the graduation is less than 0.2 °C. It is used after calibration. 4.5 Volumetric flask. 100 mL; Erlenmeyer flask. 100 mL; pipette. 25 mL. Because some samples are prone to generate bubbles with coal powder during heat treatment, it should use special long-neck flasks. 4.6 Small glass funnel. The funnel mouth inner diameter is 30 mm, the funnel handle length is about 40 mm, and the inner diameter is 4 mm ~ 5 mm.5 Determination procedure5.1 WEIGH test coal sample for general analysis (require raw coal sample or floating coal sample with ash Ad ≤ 10 %, but it may use raw coal sample for lignite that is easily argillized in water) equivalent to 1.000 0 g (accurate to 0.000 2 g) of dry ash-free coal, TRANSFER into a dry 100 mL volumetric flask. 5.3 After heating for 90 min, REMOVE the volumetric flask from the water bath and allow it to quickly cool to room temperature. USE (1 + 9) phosphate (3.3) to rinse the small funnel and volumetric flask neck, then ADD (1 + 9) phosphoric acid (3.3) to the volumetric flask to the mark. SHAKE after stoppering. 5.4 After standing for 15 min to 30 min, filter with dry funnel and dense qualitative filter paper. FILTER the filtrate into a dry 100 mL Erlenmeyer flask (it shall take care to prevent extremely fine pulverized coal from diafiltration, otherwise it shall be filtered again), DISCARD a small amount of filtrate that is originally filtered out. After filtration, discard the residue. The filtrate shall be determined for transmittance by visual colorimetry on the same day. 5.5 When performing colorimetric analysis, proceed as follows.6 Expression of determination resultsThe transmittance (PM) determination result may be read to 1 %. For coal samples with PM less than 16 %, it is filled in as less than 16 % when reporting results.7 PrecisionThe precision of transmittance (PM) determination shall comply with the specifications of Table 1.Annex A(Informative) Potassium dichromate standard series solution Annex A provides the correspondence between the concentration of the standard solution and the volume of the potassium chromate solution (3.6.1 and 3.6.2) required when preparing 50 mL of potassium dichromate standard series solution. According to actual work requirements, potassium dichromate standard solution can be prepared according to Table A.1 and Table A.2, respectively. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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