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1、BRITISH STANDARD BS ISO 13930:2007 Iron ores for blast furnace feedstocks Determination of low- temperature reduction- disintegration indices by dynamic method ICS 73.060.10 ? Licensed Copy: London South Bank University, London South Bank University, Thu Dec 20 03:26:54 GMT+00:00 2007, Uncontrolled
2、Copy, (c) BSI BS ISO 13930:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 December 2007 BSI 2007 ISBN 978 0 580 55307 3 National foreword This British Standard is the UK implementation of ISO 13930:2007. The UK participation in its p
3、reparation was entrusted to Technical Committee ISE/58, Iron ores. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct applica
4、tion. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London South Bank University, Thu Dec 20 03:26:54 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Reference number
5、 ISO 13930:2007(E) INTERNATIONAL STANDARD ISO 13930 Second edition 2007-10-15 Iron ores for blast furnace feedstocks Determination of low-temperature reduction-disintegration indices by dynamic method Minerais de fer pour charges de hauts fourneaux Dtermination des indices de dsintgration par rducti
6、on basse temprature, par mthode dynamique BS ISO 13930:2007 Licensed Copy: London South Bank University, London South Bank University, Thu Dec 20 03:26:54 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ii Licensed Copy: London South Bank University, London South Bank University, Thu Dec 20 03:26:54 GMT+
7、00:00 2007, Uncontrolled Copy, (c) BSI iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references. 1 3 Terms and definitions. 1 4 Principle. 2 5 Sampling, sample preparation and preparation of test portions. 2 6 Apparatus 2 7 Test conditions . 3 8 Procedure 4 9 Expression of res
8、ults . 5 10 Test report . 6 11 Verification 6 Annex A (normative) Flowsheet of the procedure for the acceptance of test results 9 BS ISO 13930:2007 Licensed Copy: London South Bank University, London South Bank University, Thu Dec 20 03:26:54 GMT+00:00 2007, Uncontrolled Copy, (c) BSI iv Foreword IS
9、O (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical co
10、mmittee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electro
11、technical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the me
12、mber bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identif
13、ying any or all such patent rights. ISO 13930 was prepared by Technical Committee ISO/TC 102, Iron ore and direct reduced iron, Subcommittee SC 3, Physical testing. This second edition cancels and replaces the first edition (ISO 13930:1998), which has been revised to homogenise with other physical t
14、est standards. BS ISO 13930:2007 Licensed Copy: London South Bank University, London South Bank University, Thu Dec 20 03:26:54 GMT+00:00 2007, Uncontrolled Copy, (c) BSI v Introduction This International Standard concerns one of a number of physical test methods that have been developed to measure
15、various physical parameters and to evaluate the behaviour of iron ores, including reducibility, disintegration, crushing strength, apparent density, etc. This method was developed to provide a uniform procedure, validated by collaborative testing, to facilitate comparisons of tests made in different
16、 laboratories. The results of this test should be considered in conjunction with other tests used to evaluate the quality of iron ores as feedstocks for blast furnace processes. This International Standard may be used to provide test results as part of a production quality control system, as a basis
17、 of a contract, or as part of a research project. BS ISO 13930:2007 Licensed Copy: London South Bank University, London South Bank University, Thu Dec 20 03:26:54 GMT+00:00 2007, Uncontrolled Copy, (c) BSI blank Licensed Copy: London South Bank University, London South Bank University, Thu Dec 20 03
18、:26:54 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 1 Iron ores for blast furnace feedstocks Determination of low- temperature reduction-disintegration indices by dynamic method CAUTION This International Standard may involve hazardous materials, operations and equipment. This standard does not purpor
19、t to address all of the safety issues associated with its use. It is the responsibility of the user of this International Standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to its use. 1 Scope This International Standard spec
20、ifies a method to provide a relative measure for evaluating the degree of size degradation of iron ores when reduced under conditions resembling those prevailing in the low-temperature reduction zone of the blast furnace. This International Standard is applicable to lump ores and hot-bonded pellets.
21、 2 Normative references The 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. ISO 3082:20001), Iron ore
22、s Sampling and sample preparation procedures ISO 3310-1:2000, Test sieves Technical requirements and testing Part 1: Test sieves of metal wire cloth ISO 3310-2:1999, Test sieves Technical requirements and testing Part 2: Test sieves of perforated metal plate ISO 47012), Iron ores and direct reduced
23、iron Determination of size distribution by sieving ISO 11323:2002, Iron ore and direct reduced iron Vocabulary 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 11323 apply. 1) Under revision to incorporate ISO 10386, Iron ores Method of sampling and s
24、ample preparation for physical testing. 2) To be published. (Revision of ISO 4701:1999.) BS ISO 13930:2007 Licensed Copy: London South Bank University, London South Bank University, Thu Dec 20 03:26:54 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 2 4 Principle The test portion is isothermally reduced
25、in a rotating tube bed, at 500 C, using a reducing gas consisting of CO, CO2, H2 and N2, for 60 min. The reduced product is sieved with sieves having square openings of 6,30 mm, 3,15 mm and 500 m. Three low-temperature reduction-disintegration indices (LTD) are calculated as the mass percentage of m
26、aterial greater than 6,30 mm, less than 3,15 mm and less than 500 m. 5 Sampling, sample preparation and preparation of test portions 5.1 Sampling and sample preparation Sampling of a lot and preparation of a test sample shall be in accordance with ISO 3082. The size range for pellets shall be either
27、 16,0 mm + 12,5 mm or 12,5 mm + 10,0 mm. The size range for lump ores shall be 12,5 mm + 10,0 mm. A test sample of at least 2,0 kg, on a dry basis, of the sized material shall be obtained. Oven-dry the test sample to constant mass at 105 C 5 C and cool it to room temperature before preparation of th
28、e test portions. NOTE Constant mass is achieved when the difference in mass between two subsequent measurements becomes less than 0,05 % of the initial mass of the test sample. 5.2 Preparation of test portions Collect each test portion by taking ore particles at random. At least 4 test portions, eac
29、h of approximately 500 g ( the mass of 1 particle) shall be prepared from the test sample. Weigh the test portions to the nearest 1 g and register the mass of each test portion on its recipient label. 6 Apparatus 6.1 General The test apparatus shall comprise a) ordinary laboratory equipment, such as
30、 an oven, hand tools, a time-control device and safety equipment; b) a reduction-tube assembly; c) a furnace, with a system to rotate the reduction tube; d) a system to supply the gases and regulate the flow rates; e) test sieves; f) a weighing device. Figure 1 shows an example of the test apparatus
31、. BS ISO 13930:2007 Licensed Copy: London South Bank University, London South Bank University, Thu Dec 20 03:26:54 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 3 6.2 Reduction tube, made of non-scaling, heat-resistant metal to withstand temperatures higher than 500 C and resistant to deformation. The
32、internal diameter shall be 150 mm and the internal length shall be 540 mm. Four equally spaced steel angle lifters, 540 mm long 20 mm high 4 mm thick, shall be solidly attached longitudinally inside the tube by welding, in such a manner as to prevent accumulation of material between the lifter and t
33、ube. A dust collector shall be connected to the tube to trap any fine particles carried in the gas stream out of the tube during the test. The tube shall be replaced, in any case, when its wall thickness is reduced to 3 mm in any area, and the lifters when their height is reduced to less than 18 mm.
34、 Figure 2 shows an example of a reduction tube. 6.3 Furnace, having a heating capacity and temperature control able to reach the test temperature within 45 min and to maintain the entire test portion, as well as the gas entering the test portion, at 500 C 5 C. 6.4 Rotation equipment, capable of rota
35、ting the reduction tube at a constant rate of 10 r/min 0,2 r/min. 6.5 Gas-supply system, capable of supplying the gases and regulating the gas flow rates. 6.6 Test sieves, conforming to ISO 3310-1 or ISO 3310-2 and having square apertures of the following nominal sizes: 6,30 mm; 3,15 mm; 500 m. 6.7
36、Weighing device, capable of weighing the test sample and test portions to an accuracy of 0,1 g. 7 Test conditions 7.1 General Volumes and flow rates of gases are as measured at a reference temperature of 0 C and at a reference atmospheric pressure of 101,325 kPa (1,013 25 bar). 7.2 Reducing gas 7.2.
37、1 Composition The reducing gas shall consist of: CO 20,0 % 0,5 % (volume fraction) CO2 20,0 % 0,5 % (volume fraction) H2 2,0 % 0,2 % (volume fraction) N2 58,0 % 1,0 % (volume fraction) 7.2.2 Purity Impurities in the reducing gas shall not exceed: O2 0,1 % (volume fraction) H2O 0,2 % (volume fraction
38、) 7.2.3 Flow rate The flow rate of the reducing gas, during the entire reducing period, shall be maintained at 20 L/min 1 L/min. BS ISO 13930:2007 Licensed Copy: London South Bank University, London South Bank University, Thu Dec 20 03:26:54 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 4 7.3 Heating a
39、nd cooling gas Nitrogen (N2) shall be used as the heating and cooling gas. Impurities shall not exceed 0,1 % (volume fraction). The flow rate of N2 shall be maintained at 20 L/min until the test portion reaches 500 C, during the temperature-equilibration period and during cooling. 7.4 Temperature of
40、 the test portion The temperature of the entire test portion shall be maintained at 500 C 5 C during the entire reducing period and, as such, the reducing gas shall be preheated before entering the test portion. 8 Procedure 8.1 Number of determinations for the test Carry out the test as many times a
41、s required by the procedure in Annex A. 8.2 Reduction Take, at random, one of the test portions prepared in 5.2 and place it in the reduction tube (6.2). Insert the reduction tube into the furnace (6.3). Close the reduction tube, connect the thermocouple, ensuring that its tip is in the middle of th
42、e reduction tube, and connect the gas supply system. By means of the rotation equipment (6.4), commence rotation of the reduction tube at 10 r/min 0,2 r/min. Pass a flow of N2 through the test portion at a rate of 20 L/min. Heat the test portion, bring the temperature inside the reduction tube to 50
43、0 C within 45 min and stabilise the temperature within the next 15 min. If this requirement is not met, discontinue the test and start a new one. DANGER Carbon monoxide, hydrogen and the reducing gas, which contains carbon monoxide and hydrogen, are toxic and explosive, and therefore hazardous. Test
44、ing shall be carried out in a well ventilated area or under a hood. Precautions should be taken for the safety of the operator, in accordance with the safety codes of each country. Introduce the reducing gas at a flow rate of 20 L/min 1 L/min to replace the N2. After 60 min of reduction, stop the fl
45、ow of the reducing gas, stop the rotation of the reduction tube and cool the test portion to a temperature below 350 C in the reduction tube under N2 at a flow rate of 20 L/min. Then lift the reduction tube from the furnace and cool the test portion to below 100 C, still under the flow of inert gas.
46、 8.3 Sieving Remove all the material carefully from the reduction tube, scraping, if necessary, to remove any material adhering to the tube wall. Determine and register the mass of the reduced material (m0) and sieve it mechanically on 6,30 mm, 3,15 mm and 500 m sieves, in accordance with ISO 4701.
47、Determine and record the mass of each fraction retained on the 6,30 mm (m1), 3,15 mm (m2) and 500 m (m3) sieves. The dry weight of the dust trapped in the dust collector, and material lost during sieving, shall be considered to be part of the 500 m fraction. BS ISO 13930:2007 Licensed Copy: London S
48、outh Bank University, London South Bank University, Thu Dec 20 03:26:54 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 5 9 Expression of results 9.1 Calculation of the low-temperature disintegration indices (LTD+6,3, LTD 3,15 and LTD 0,5) The low-temperature disintegration indices LTD+6,3, LTD3,15 and L
49、TD0,5, expressed as percentages by mass, are calculated from the following equation: 1 6,3 0 LTD100 m m + = 012 3,15 0 () LTD100 mmm m + = 0123 0,5 0 () LTD100 mmmm m + = where m0 is the mass, in grams, of the test portion after reduction, including the dust trapped in the dust collector; m1 is the mass, in grams, of the fraction retained on the 6,30 mm sieve; m2 is the mass, in grams, of the fraction retained on the 3