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GB/T 10322.7-2016: Iron ores and direct reduced iron -- Determination of size distribution by sieving 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 10322.7: Historical versions
Similar standardsGB/T 10322.7-2016: Iron ores and direct reduced iron -- Determination of size distribution by sieving---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/GBT10322.7-2016 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 73.060.10 D 31 GB/T 10322.7-2016 / ISO 4701.2008 Replacing GB/T 10322.7-2004 Iron ores and direct reduced iron - Determination of size distribution by sieving (ISO 4701.2008, IDT) Issued on. DECEMBER 30, 2016 Implemented on. SEPTEMBER 01, 2017 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the PRC; Standardization Administration of the PRC. Table of ContentsForeword... 3 1 Scope... 9 2 Normative references... 9 3 Terms and definitions... 10 4 Principles and planning... 10 5 Apparatus... 17 6 Samples... 20 7 Procedures... 21 8 Verification... 30 9 Results... 30 10 Test report and working log... 33 11 Precision... 33 Annex A (Informative) Steps for establishing the operating conditions for the determination of size distribution using a single sieve or a nest of sieves... 35 Annex B (Normative) Scheme of sample preparation and sieving procedure 36 Annex C (Normative) Maximum mass to be retained on a sieve at completion of batch sieving (m) in order to obtain good sieving efficiency... 37 Annex D (Informative) Size apertures in R20 and R40/3 series... 38 Annex E (Informative) Typical batch sieving apparatus... 39 Annex F (Informative) Desirable features of mechanical sieving machines... 40 Annex G (Normative) Procedure for determining the minimum mass of sample used for sieving... 44 Annex H (Normative) Flowsheet of the procedure for the acceptance of analytical values for test portions... 48 Annex I (Informative) Explanation... 49 Annex J (Normative) Determination of the average particle size (APS)... 51ForewordGB/T 10322 "Iron ores" is divided into 8 parts. - Part 1.Iron ores - Sampling and sample preparation procedures; - Part 2.Iron ores - Experimental methods for evaluation of quality variation; - Part 3.Iron ores - Experimental methods for checking the precision of sampling; - Part 4.Iron ores - Experimental methods for checking the bias of sampling; - Part 5.Iron ores - Determination of the moisture content of a lot; - Part 6.Iron ore - Determination of decrepitation index; - Part 7.Iron ores and direct reduced iron - Determination of size distribution by sieving; - Part 8.Iron ores - Single-point determination of specific surface area - Nitrogen adsorption method. This Part is Part 7 of GB/T 10322. This Part is drafted in accordance with the rules given in GB/T 1.1-2009. This Part replaces GB/T 10322.7-2004 "Iron ore - Determination of size distribution by sieving". Compared with GB/T 10322.7-2004, in addition to editorial changes, the main technical changes of this Part are as follows. - Add direct reduced iron to the scope of application; so change the standard name to "Iron ores and direct reduced iron - Determination of size distribution by sieving". - In Clause 1 Scope, change the previous "This Standard specifies the methods to be employed for determination of size distributions by sieving of iron ore, utilizing sieves having aperture sizes of 36 μm or larger. The size distribution is expressed in terms of mass and percentage mass, passed or retained on selected sieves. The purpose of this Standard is to provide a basis for any testing of iron ore involving size determination for use by contracting parties in the sale and purchase of these materials" TO "This Part of GB/T 10322 specifies the methods to be employed for determination of size distributions of iron ore and direct reduced iron. This Part applies to the determination of size distributions of iron ore and direct reduced iron, utilizing sieves having aperture sizes of 36 μm or larger". - Change the previous Clause 4"Principles and scheme" to "Principles and planning". - Supplement the ground state requirements for test samples that "The determination of size distribution of iron ores and direct reduced iron (DRI) may be carried out on a ‘dry’ or ‘natural’ (or ‘as-received’) basis" to the 4.1 “General”. - Simplify the content of 4.3.1 Effect of moisture content; change to "When it is difficult to conduct sample division due to sample being adhesive or excessively wet, the sample shall be dried to constant mass in accordance with 7.1". - In 4.3.2, change "For brittle iron ore during particle size analysis, the deviation check between mechanical sieving and hand sieving shall be carried out according to the procedure given in GB/T 10322.4-2000 (see 5.2)" TO "There are differences in degradation of ores. Certain iron ores, particularly lump ore, and DRI may be subject to significant degradation during the sampling and size analysis sequences. Furthermore, different sampling and size analysis processes can cause degradation of ores and DRI to different extents. Consequently this may lead to significant variation in results for the same lot. It is therefore essential that any degradation should be minimized through the correct design of manual sampling, mechanical sampling and size analysis systems. Sampling systems should be designed in accordance with the guidelines set out in ISO 3082 and ISO 10835". - In subclause 4.3.3, change "For iron ores with pronounced magnetic properties, demagnetization of the size sample shall be carried out" TO "For iron ores with pronounced magnetic properties and DRI that has been handled by magnets, it is desirable to ensure that the size sample be demagnetized or that the sieves are non-magnetic". - In subclause 4.4, change "Sampling methods for iron ore (GB/T 10322.1) will generally provide number of samples in excess of the sieving requirements" TO "Iron ore and DRI are prepared according to ISO 3082 and ISO 10835 for the number of samples required for sieving, respectively". - Change the previous 4.5 "Choice of dry and wet sieving" to "Choice of sieving method". - Change the content in subclause 4.5.1 to "Two different sieving methods are available to perform particle size analysis (see Annex I). a) dry sieving, i.e. sieving without the application of water; b) wet sieving, i.e. sieving with a sufficient application of water to ensure the passage of undersize particles through the sieve apertures. A table summarizing the sample preparation and sieving procedure is given in Annex B". - In subclause 4.5.2, change "The choice of sieving method for each part of a size determination shall be made on the basis of attaining the defined precision of testing (see 11.1). Details on the procedure shall be recorded in the working log" TO "The results of these methods may not be the same. No specific preference is given in this Part for either method when sieving iron ore samples. For DRI, dry sieving is recommended". - In subclause 4.5.3, change "If a combination of any of the sieving methods is employed for different parts of the same overall size distribution, the changeover from dry to wet sieving shall be clearly indicated on the report sheet (see Clause 10)" TO "The choice of sieving method (see 4.5.5) for each part of a size determination shall be made on the basis of attaining the defined precision of testing (see 11.1). Details on the procedure shall be recorded in the working log". - Change the content of 4.7.1 "General" to "The loading of a sieve or nest of sieves or continuous sieving machine shall be limited as prescribed in 4.7.2 and 4.7.3 and requires previous information about the size distribution of the sample to be sieved". - The previous 4.7.2 corresponds to 4.7.2.1.And change "The maximum mass retained shall not exceed the values tabulated in Annex A or as determined in 4.7.2.1 or 4.7.2.2" TO "The maximum mass retained shall not exceed the values tabulated in Annex C or as determined in 4.7.2.2 or 4.7.2.3". - Change the previous "4.7.2.1 Apertures ≥ 500 μm" TO "4.7.2.2 Apertures ≥ 4 mm"; supplement the bulk density of the sample and measure it according to ISO 3852. - Change the previous "4.7.2.2 Apertures < 500 μm" TO "4.7.2.3 Apertures < 4 mm"; change "the maximum mass of sample retained shall not exceed 2 times the allowable maximum retention mass listed in Annex A" TO "the maximum mass of sample retained shall be as given in Annex C". - Delete "hand sieving time" from Table 2. - Change the previous 6.2 "Acquisition of test sample(s) for division and sieving" to "Mass of test sample(s) for sieving". - Supplement "Table 3 Comparison of overall sizing precision, βSPM, with the precisions of sampling, βS, and sample preparation and measurement, βPM" to the subclause 6.2.2. - Change the previous 7.4.1 "General theory" to "General principles"; change "22.4 mm" to "40 mm". Add the provision that "Of the above, the hand sieving method performed in accordance with 7.4.3 or 7.4.4 is the reference method that shall be used for bias assessments and in settling of between- laboratory disputes". - Change "22.4 mm" in the previous subclause 7.4.2 to "40 mm". - Change "1 mm ~ 22.4 mm" in the previous subclause 7.4.3 to "1 mm ~ 40 mm", "60 times" to "120 times", and "amplitude 70 mm" to "120 mm". - Add "applicable to round sieves with 200 mm and 300 mm diameters" to the subclause 7.4.4. - Supplement the provision that "Continuous sieving machines shall be tested for bias in accordance with 5.2" to the subclause 7.4.7. - Supplement "Table 4 Example of calculation and evaluation of results when sieving a gross sample or test sample derived from the gross sample" and "Table 5 Example of calculation and evaluation of results when sieving several partial samples or increments" to the subclause 9.2.3. - Uniformly change the words "specimens" and "samples" appearing in subclause 9.3 to "test portions". - Supplement the provision that "The median of four test results is defined as the mean of the two non-extreme test results" to the subclause 9.3.7. - In the subclause 9.3.8, change the previous "The value of r shall be 2 % with reference to the specification size or other designated aperture sizes" TO "The value of r shall be √2 βPM with reference to the specification size or other designated aperture sizes". - In subclause 11.1 Overall precision, change "It shall meet the requirements of GB/T 10322.1" TO "This Part has been prepared with the aim of satisfying the approximate overall precision requirements defined in ISO 3082 and ISO 10835.These precisions for sizing are set out in Table 6 below. The precision obtained in practice should be determined regularly according to one of the protocols set out in ISO 3085". - Supplement "Table 6 Overall precision of sizing, βSPM" to the subclause 11.2 Precision of preparation and measurement. - The previous Annex A is Annex C in this Part; the previous Annex B is Annex G in this Part; the previous Annex G is Annex I in this Part. In this revision, add Annex A "Steps for establishing the operating conditions for the determination of size distribution using a single sieve or a nest of sieves", Annex B "Scheme of sample preparation and sieving procedure", and Annex J "Determination of the average particle size (APS)" to this Part. This Part, using translation method, is identical to ISO 4701.2008 "Iron ores and direct reduced iron - Determination of size distribution by sieving". China’s documents which have a consistent correspondence with the international documents normatively referenced in this Part are as follows. - GB/T 6003.1-2012 Test sieves - Technical requirements and testing - Part 1.Test sieves of metal wire cloth (ISO 3310-1.2000, MOD) - GB/T 6003.2-2012 Test sieves - Technical requirements and testing - Part 2.Test sieves of metal wire cloth (ISO 3310-2.1999, MOD) - GB/T 10322.1-2014 Iron ores - Sampling and sample preparation procedures (ISO 3082.2009, IDT) - GB/T 10322.3-2000 Iron ores - Experimental methods for checking the precision of sampling (idt ISO 3085.1996) - GB/T 10322.4-2014 Iron ores - Experimental methods for checking the bias of sampling (ISO 3086.2006, IDT) - GB/T 10322.5-2016 Iron ores - Determination of the moisture content of a lot (ISO 3087.2011, IDT) - GB/T 20565-2006 Iron ores and direct reduced iron - Vocabulary (ISO 11323.2002, IDT) - GB/T 24239-2009 Direct reduced iron and hot briquetted iron - Sampling and sample preparation (ISO 10835.2007, IDT) This Part was proposed by China Iron and Steel Association. This Part shall be under the jurisdiction of National Technical Committee 317 on Iron Ore and Direct Reduced Iron of Standardization Administration of China (SAC/TC 317). Drafting organizations of this Part. Shanghai Baosteel Industrial Technology Services Co., Ltd., Baoshan Iron & Steel Co., Ltd., China Metallurgical Information and Standardization Institute. Main drafters of this Part. Wang Chunsheng, Chen Xiaoqi, Wang Han, Yu Chengfeng, Ji Huadong, Chen Zibin. The previous editions of the standard replaced by this Part were released as follows. - GB/T 10322.7-2004. Iron ores and direct reduced iron - Determination of size distribution by sieving1 ScopeThis Part of GB/T 10322 specifies the methods to be employed for determination of size distributions of iron ore and direct reduced iron.2 Normative referencesThe following documents are indispensable for the application of this document. For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document.3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 11323 apply.4 Principles and planningThe principal purposes of particle size determination are as follows. The sample may be received in the form of a gross sample, several partial samples or increments.5 ApparatusWhen wet sieving is carried out, in addition to the apparatus mentioned in 5.1 and 5.2, it is necessary to have available a controllable supply of water, a spray nozzle and, where appropriate, a collecting tank. Each device for the determination of mass shall have a sensitivity of 0.1 % of its rated capacity and a level of accuracy such that the mass of the test sample and of each size fraction may be determined to a precision of ± 0.1 % or better of the test sample mass.6 SamplesThe mass of the test samples used for sieving shall be equal to or greater than the minimum mass defined in 6.2.2. The level of precision, βPM, to be used shall be determined so that the overall precision specified in Table 3 shall be met.7 ProceduresOne or more of the following methods of sample division shall be conducted individually or jointly; the applicability of each method for division of the particular ore and DRI shall be determined by reference to ISO 3082 or ISO 10835.8 VerificationThe precision of any division procedures adopted during sieve size analysis shall be determined and evaluated in accordance with ISO 3085.More frequent checks shall be carried out on the critical parameters associated with the adopted division method.9 ResultsIf the range of these four size analyses do not agree within the limit 1.3 r, the median of these four size analyses is taken to be representative of the lot. The median of four test results is defined as the mean of the two non-extreme test results.10 Test report and working logThe test results shall be traceable and cover the following items. ......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 10322.7-2016 be delivered?Answer: The full copy PDF of English version of GB/T 10322.7-2016 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 10322.7-2016_English with my colleagues?Answer: Yes. 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