GB/T 3286.9-2014 PDF EnglishUS$790.00 · In stock · Download in 9 seconds
GB/T 3286.9-2014: Method for chemical analysis of limestone and dolomite - Part 9: The determination of carbon dioxide content - The caustic asbestos absorption gravimetric method 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 3286.9: Historical versions
Similar standardsGB/T 3286.9-2014: Method for chemical analysis of limestone and dolomite - Part 9: The determination of carbon dioxide content - The caustic asbestos absorption gravimetric method---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/GBT3286.9-2014 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 73.080 D 52 Replacing GB/T 3286.9-1998 Method for Chemical Analysis of Limestone and Dolomite - Part 9.The Determination of Carbon Dioxide Content - The Caustic Asbestos Absorption Gravimetric Method Issued on. JUNE 9, 2014 Implemented on. JANUARY 1, 2015 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... 5 2 Normative References... 5 3 Principle... 5 4 Reagents... 6 5 Instruments and Devices... 6 6 Specimen Preparation... 9 7 Analysis Steps... 10 7.1 Number of Determinations... 10 7.2 Amount of Test Portion... 10 7.3 Inspection of Instruments and Devices... 10 7.4 Calibration of Instruments and Devices... 10 7.5 Determination... 10 8 Calculation and Expression of Analysis Results... 12 8.1 Calculation of Analysis Results... 12 8.2 Determination and Expression of Analysis Results... 12 9 Allowable Differences... 12 10 Test Report... 13 Appendix A (normative) Flow Chart of Specimen Analysis Results Acceptance Procedures... 14 Appendix B (informative) Determination of Carbon Dioxide Content in Metallurgical Lime Using Combustion Gas Volumetric Method... 15 Appendix C (informative) Temperature and Pressure Correction Coefficient Table... 221 ScopeThis Part of GB/T 3286 specifies the determination of carbon dioxide content through the caustic asbestos absorption gravimetric method. This Part is applicable to the determination of carbon dioxide content in limestone and dolomite, and also to the determination of carbon dioxide content in metallurgical lime. The determination range (mass fraction) in limestone and dolomite. carbon dioxide content 30% ~ 50%; the determination range (mass fraction) in metallurgical lime. carbon dioxide content greater than 0.50%.2 Normative ReferencesThe following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 2007.2 General Rules for the Sampling and Sample Preparation of Minerals in Bulk - Manual Method for Sample Preparation GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods GB/T 8170 Rules of Rounding off for Numerical Values & Expression and Judgment of Limiting Values3 PrincipleThe test portion is decomposed with phosphoric acid, and dry air with carbon dioxide removed is used as the carrier gas. The generated carbon dioxide is absorbed by caustic asbestos. In accordance with the increased mass, calculate the carbon dioxide content. The moisture generated during the decomposition of the test portion is absorbed by sulfuric acid and magnesium perchlorate, and the hydrogen sulfide generated from the sulfide is absorbed and removed by chromium trioxide sulfuric acid solution.4 Reagents4.1 Unless it is otherwise stated, only approved analytically pure reagents and above Grade-3 distilled water complying with the stipulations of GB/T 6682 or equivalent water shall be used in the analysis. 4.2 Soda lime. 4.3 Caustic asbestos, with a particle size of 0.5 mm ~ 1 mm. 4.4 Anhydrous magnesium perchlorate, with a particle size of 0.5 mm ~ 1 mm; dry in a drying oven at 180 C for 2 hours, quickly transfer to a desiccator, cool and set aside. NOTE. used magnesium perchlorate can be re-used after drying. 4.5 Anhydrous calcium chloride. 4.6 High-purity calcium carbonate, not lower than 99.99%. 4.7 Dehydrated sulfuric acid. place sulfuric acid (ρ = 1.84 g/mL) in a beaker, heat until it emits smoke, and maintain for a while, let it slightly cool, then, carefully place in a desiccator, cool and set aside. 4.8 Phosphoric acid, 1 + 1. 4.9 Chromium trioxide sulfuric acid solution, 10 g/L. Take 1 g of chromium trioxide in a beaker, add 1 mL of water, add 100 mL of sulfuric acid (ρ = 1.84 g/mL) to dissolve it, and evenly mix it.5 Instruments and DevicesThe device for measuring carbon dioxide is shown in Figure 1. Description of indexes. 5.1 Rotor flowmeter (1 in Figure 1), 20 mL/min ~ 200 mL/min, used to observe the flow of air as the carrier gas. 5.2 Drying tower (2 in Figure 1). with a capacity of approximately 500 mL, containing soda lime (4.2). 5.3 Drying tower (3 in Figure 1). with a capacity of approximately 500 mL, containing anhydrous calcium chloride (4.5). 5.4 Special-made acid adding tube (4 in Figure 1). with a capacity of 30 mL. 5.5 Special-made connecting tube (5 in Figure 1). use double-hole rubber plugs to connect to the dry tower (5.3) and the special-made acid adding tube (5.4). 5.13 Drying tower (13 in Figure 1). the lower part contains anhydrous calcium chloride (4.5), the upper part contains soda lime (4.2), separated by absorbent cotton in the middle. 5.14 Gas washing bottle (14 in Figure 1), containing water. 5.15 Water flow suction tube (15 in Figure 1), connected to the faucet. 5.16 All parts of the device are connected with rubber hoses of appropriate length as shown in Figure 1, and each device is fixed with corresponding clamps.6 Specimen Preparation6.1 In accordance with GB/T 2007.2, prepare the specimens. 6.2 The specimens shall be processed until the particle size is less than 0.125 mm. 6.3 Before analysis, the limestone and dolomite specimens shall be dried at 105 C ~ 110 C for 2 hours and placed in a desiccator to cool to room temperature.7 Analysis Steps7.1 Number of Determinations For the same specimen (6.3 or 6.4), conduct at least two independent determinations. 7.4 Calibration of Instruments and Devices The calibration of instruments and devices is performed in accordance with 7.5. 7.5 Determination 7.5.1 Adjust Piston E to control the air flow rate at 170 mL/min ~ 180 mL/min and maintain it for about 15 min. Close F. After the buttles in the gas washing bottle (5.10) stop, successively close the pistons of the carbon dioxide absorbing U-shaped tube (5.12) and the U-shaped tube (5.11) and remove the carbon dioxide absorbing U-shaped tube (5.12). Use clean gauze to gently wipe it, place it in the balance box for 15 minutes, and weigh it. 7.5.2 Then, connect the carbon dioxide absorbing U-shaped tube (5.12) to the determination system, and operate in accordance with 7.5.1, until the difference between the two weighings is not greater than 0.5 mg. Take the last weighed mass as the mass of the U-shaped tube (5.12) before absorbing carbon dioxide. 7.5.8 After the determination is completed, connect the carbon dioxide absorbing U-shaped tube (5.12) to the determination system, successively close B, D, G and H, and finally, close the air extraction water gate to prevent water from flowing back.8 Calculation and Expression of Analysis Results8.1 Calculation of Analysis Results9 Allowable DifferencesThe difference between two independent analysis results within the laboratory and the difference between two laboratory analysis results shall not be greater than the corresponding allowable differences listed in Table 1 ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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