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GB/T 6730.6-2016: Iron ores - Determination of metallic iron content - Ferric chloride-sodium acetate titrimetric 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 6730.6: Historical versions
Similar standardsGB/T 6730.6-2016: Iron ores - Determination of metallic iron content - Ferric chloride-sodium acetate titrimetric 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/GBT6730.6-2016 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 73.060.10 D 31 Replacing GB/T 6730.6-1986 Iron ores - Determination of metallic iron content - Ferric chloride-sodium acetate titrimetric method Issued on. OCTOBER 13, 2016 Implemented on. SEPTEMBER 01, 2017 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Principle... 6 4 Reagents... 6 5 Instruments... 7 6 Sampling and sample preparation... 7 7 Analysis steps... 8 8 Analysis results and their representation... 10 9 Test report... 12 Annex A (Normative) Acceptance procedure for specimen analysis results... 13 Annex B (Informative) Precision test raw data... 14 Annex C (Informative) Graphical representation of precision results... 15ForewordGB/T 6730 “Iron ores” consists of several parts. This Part is Part 6 of GB/T 6730. This Part was drafted in accordance with the rules given in GB/T 1.1-2009. This Part replaces GB/T 6730.6-1986 “Methods for chemical analysis of iron ores. The ferric chloride-sodium acetate volumetric method for the determination of metallic iron content”. Compared with GB/T 6730.6-1986, in addition to editorial modifications, the main technical changes are as follows. - changed the standard’s name to “Iron ores - Determination of metallic iron content - Ferric chloride-sodium acetate titrimetric method”; - added the content of “Warning”, “Normative references”, “Instruments”, “Test report”, “Annex B” and “Annex C”; - changed the determination range from "0.3%~2.0%" to "0.150%~3.00%"; - modified the processing operation for separating non-magnetic substances and the stirring time of metal iron leaching; changed from outer magnetic separation to inner magnetic separation; - modified the calculation formula for “calculation of analysis results”; - conducted the interlaboratory precision co-test; used the statistically derived repeatability limits r and reproducibility limits R to replace “tolerance”. This Part was proposed by China Iron and Steel Association. This Part shall be under the jurisdiction of National Technical Committee on Iron Ore and Direct Reduced Iron of Standardization Administration of China (SAC/TC 317). Main drafting organizations of this Part. Changsha Mining and Metallurgy Research Institute Co., Ltd., Metallurgical Industry Information Standards Research Institute. Main drafters of this Part. Zhou Ting, Wang Yue, Zhou Haibo, Liu Yanhua, Zhang Zhiyong, Sun Xiangli, Statement, Yang Lin, Chen Zibin. Version of standard substituted by this Standard is. - GB/T 6730.6-1986. Iron ores - Determination of metallic iron content - Ferric chloride-sodium acetate titrimetric method WARNING - Persons using this Part shall have experience in formal laboratory work. This Part does not address all security issues. It is the user's responsibility to take appropriate safety and health measures and to ensure compliance with the conditions stipulated by relevant national regulations.1 ScopeThis Part of GB/T 6730 specifies the ferric chloride-sodium acetate titrimetric method to determine the metallic iron content. This Part is applicable to determination of metallic iron content in iron ore, iron concentrate, sinter and pellets. The determination range (mass fraction). 0.150%~3.00%.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 6379.1, Accuracy (trueness and precision) of measurement methods and results - Part 1.General principles and definitions GB/T 6379.2, Measurement methods and results - Accuracy (trueness and precision) - Part 2.Determine the standard methods of measurement repeatability and reproducibility of the basic method GB/T 6682, Water for analytical laboratory use - Specification and test methods GB/T 6730.1, Iron ores - Preparation of pre-dried test samples for chemical analysis3 PrincipleThe specimen is first separated from non-magnetic substances by magnetic separation. Under electromagnetic stirring conditions, use ferric chloride- sodium acetate buffer solution (pH 2.2~2.4) to selectively dissolve metallic iron. After separation by filtration, use potassium dichromate standard titration solution titrate the filtrate.4 ReagentsUnless otherwise specified, in the analysis, it shall only use the confirmed analytically-pure reagents and grade three and above distilled water specified in GB/T 6682 or deionized water or equivalent-pure water. 4.1 Anhydrous ethanol. 4.2 Mixed sulfuric acid. 2+3+5. Pour 300mL of phosphoric acid (ρ=1.70g/mL) into 500mL of water under stirring. Then slowly add 200mL of sulfuric acid (ρ=1.84g/mL). Mix well. 4.5 Potassium dichromate standard titration solution. c(1/6K2Cr2O7) = 0.02000mol/L. 4.7 Sodium diphenylamine sulfonate indicator solution. 2g/L. Weigh 0.1g of sodium diphenylamine sulfonate and dissolve it in 50mL of water. Add 2 to 3 drops of concentrated sulfuric acid (ρ=1.84g/mL). Use after the solution is clear. 4.8 Pickled asbestos. Take 10g of pickled asbestos and burn at 900°C for more than 2h in advance. Leave it for future use.5 InstrumentsIn the analysis, only common laboratory instruments are used. The burettes, single-marked volumetric flasks and single-marked pipettes used shall comply with the provisions of GB/T 12805, GB/T 12806 and GB/T 12808, respectively. 5.3 Non-magnetic metal iron core stirrer. 5.4 Adjustable speed magnetic stirrer.6 Sampling and sample preparation6.1 Laboratory specimen Laboratory specimens for analysis shall be sampled and prepared in accordance with GB/T 10322.1.The particle size shall be less than 100μm. If the content of combined water or easily oxidized in the specimen is high, the particle size shall be less than 160μm. 6.2 Preparation of specimen 6.2.1 Ores with high content of combined water or easy oxides For the following types of ores, prepare air balance specimens according to GB/T 6730.3.7 Analysis steps7.1 Number of determinations For a same specimen, at least conduct two independent determinations. 7.2 Amount of test material Weigh test material according to Table 1, accurate to 0.0001g. 7.3 Blank test Conduct the blank test with the test material. The reagents used must be taken from the same reagent bottle. 7.4 Verification test Analyze a standard sample of the same type along with the test material. 7.5 Determination 7.5.1 Decomposition of test material Place the test material (see 7.2) in a dry Petri dish (see 5.1). Add 15mL~20mL of ethanol (see 4.1). Mix well. Place one end of the ferrite magnet (see 5.2) with a field strength of 1000Oe in a clean small beaker (the diameter of the small beaker is slightly larger than that of the magnet). Use a small beaker to gently grind the test material in a petri dish several times. Lightly lift the small beaker. Rinse off non-magnetic substances with a narrow neck wash bottle filled with ethanol. Move the small beaker over the second clean Petri dish. Take out the magnet. Use a washing bottle to flush the magnetic substance attached to the wall of the small beaker into this Petri dish. Repeat the above magnetic separation action more than 5 times. Transfer all the magnetic material to the second Petri dish. 7.5.2 Determination of test material Add 20 mL of thiophosphoric acid (see 4.2) to the filtrate (see 7.5.1). The control volume is 120mL~150mL. Let stand until the yellow color subsides slightly. Add 5 drops of sodium diphenylamine sulfonate indicator solution (see 4.7). Use potassium dichromate standard titration solution (see 4.5) to titrate to a stable purple color. 7.5.3 Determination of blank value Add 10.00mL of ferrous ammonium sulfate solution (see 4.6) and 20mL of sulfur-phosphorus mixed acid (see 4.2) to the blank solution accompanying the test material. Let stand until the yellow color subsides slightly. Add 5 drops of sodium diphenylamine sulfonate indicator solution (see 4.7).8 Analysis results and their representation8.1 Calculation of metallic iron content Calculate the content (mass fraction) wMFe of metallic iron in the specimen according to formula (1), expressed in %. 8.2 General handling of results 8.2.4 Acceptance of analytical values Acceptance of analytical values is verified using certified reference materials (CRM) or reference materials (RM). Final laboratory results are used for comparison with CRM or RM standard value Ac. Two possibilities will arise. 8.2.5 Calculation of final result The final result is the arithmetic mean of the acceptable values for the specimen, or the value determined by the procedure specified in Annex A. The analysis result is rounded up according to the provisions of GB/T 8170.When the analysis result is less than 1.00%, round the value to three decimal places.9 Test reportThe test report shall contain the following information.Annex A(Normative) Acceptance procedure for specimen analysis results See Figure A.1 for the acceptance procedure for specimen analysis results.Annex B(Informative) Precision test raw data The precision data is determined by a joint analysis test of 5 iron ore samples by 8 domestic laboratories from 2014 to 2015.The content of metallic iron at each level is determined independently by each laboratory 3 times under repeatable conditions. The determined raw data are shown in Table B.1. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 6730.6-2016 be delivered?Answer: The full copy PDF of English version of GB/T 6730.6-2016 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 6730.6-2016_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 6730.6-2016_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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