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1、 Reference number ISO 4696-1:2007(E) ISO 2007 INTERNATIONAL STANDARD ISO 4696-1 Second edition 2007-10-15 Iron ores for blast furnace feedstocks Determination of low-temperature reduction-disintegration indices by static method Part 1: Reduction with CO, CO2, H2 and N2 Minerais de fer pour charges d
2、e hauts fourneaux Dtermination des indices de dsagrgation par rduction basse temprature par mthode statique Partie 1: Rduction avec CO, CO2, H2 et N2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=leee, leee Not
3、 for Resale, 11/22/2007 18:28:32 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 4696-1:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the
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6、nlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2007 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electr
7、onic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.or
8、g Web www.iso.org Published in Switzerland ii ISO 2007 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=leee, leee Not for Resale, 11/22/2007 18:28:32 MSTNo reproduction or networking permitted
9、 without license from IHS -,-,- ISO 4696-1:2007(E) ISO 2007 All rights reserved 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 conditi
10、ons . 3 8 Procedure 4 9 Expression of results . 5 10 Test report . 6 11 Verification 7 Annex A (normative) Flowsheet of the procedure for the acceptance of test results 11 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/111111100
11、1, User=leee, leee Not for Resale, 11/22/2007 18:28:32 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 4696-1:2007(E) iv ISO 2007 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
12、 (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 committee has been established has the right to be represented on that committee. International organizations,
13、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 electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/
14、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 member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the me
15、mber 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 identifying any or all such patent rights. ISO 4696-1 was prepared by Technical Committee ISO/TC 102, Iron ore and d
16、irect reduced iron, Subcommittee SC 3, Physical testing. This second edition cancels and replaces the first edition (ISO 4696-1:1996), which has been revised to homogenise with other physical test standards. ISO 4696 consists of the following parts, under the general title Iron ores for blast furnac
17、e feedstocks Determination of low-temperature reduction-disintegration indices by static method: Part 1: Reduction with CO, CO2, H2 and N2 Part 2: Reduction with CO and N2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/111111100
18、1, User=leee, leee Not for Resale, 11/22/2007 18:28:32 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 4696-1:2007(E) ISO 2007 All rights reserved v Introduction This part of ISO 4696 concerns one of a number of physical test methods that have been developed to measure
19、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
20、 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 part of ISO 4696 may be used to provide test results as part of a production quality control system, as a basis of a
21、contract, or as part of a research project. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=leee, leee Not for Resale, 11/22/2007 18:28:32 MSTNo reproduction or networking permitted without license from IHS -,-,-
22、 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=leee, leee Not for Resale, 11/22/2007 18:28:32 MSTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 4696-1:2007(E)
23、ISO 2007 All rights reserved 1 Iron ores for blast furnace feedstocks Determination of low- temperature reduction-disintegration indices by static method Part 1: Reduction with CO, CO2, H2 and N2 CAUTION This standard may involve hazardous materials, operations and equipment. This standard does not
24、purport to address all of the safety issues associated with its use. It is the responsibility of the user of this part of ISO 4696 to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to its use. 1 Scope This part of ISO 4696 specifies
25、a method to provide a relative measure for evaluating the degree of size degradation of iron ores when reduced with carbon monoxide, carbon dioxide, hydrogen and nitrogen, under conditions resembling those prevailing in the low-temperature reduction zone of a blast furnace. This part of ISO 4696 is
26、applicable to lump ores, sinters and hot-bonded pellets. 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 (incl
27、uding any amendments) applies. ISO 3082:20001), Iron ores 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 perforat
28、ed metal plate ISO 4701:2), Iron ores and direct reduced 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
29、incorporate ISO 10836, Iron ores Method of sampling and sample preparation for physical testing. 2) To be published. (Revision of ISO 4701:1999) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=leee, leee Not for
30、Resale, 11/22/2007 18:28:32 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 4696-1:2007(E) 2 ISO 2007 All rights reserved 4 Principle The test portion is isothermally reduced in a fixed bed, at 500 C, using a reducing gas consisting of CO, CO2, H2 and N2, for 60 min. Th
31、e reduced test portion is tumbled in a specific tumble drum for 300 revolutions and then sieved with sieves having square openings of 6,30 mm, 3,15 mm and 500 m. Three reduction- disintegration indices (RDI) are calculated as the mass percentage of material greater than 6,30 mm, less than 3,15 mm an
32、d 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, sinters and lump ores shall be 12,5 mm + 10,0 mm. A test sample
33、of at least 2 kg, on 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 the test portions. NOTE Constant mass is achieved when the difference in mass between two subsequent measurements beco
34、mes 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. NOTE Manual methods of division recommended in ISO 3082, such as riffling, can be applied to obtain the test portions. At least 4 test portions,
35、each of approximately 500 g ( the mass of 1 particle) shall be prepared from the test sample. Weigh the test portions to the nearest 0,1 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, su
36、ch as an oven, hand tools, a time-control device and safety equipment; b) a reduction-tube assembly; c) a furnace; d) a system to supply the gases and regulate the flow rates; e) a tumble drum; f) test sieves; g) a weighing device. Figure 1 shows an example of the test apparatus. Copyright Internati
37、onal Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=leee, leee Not for Resale, 11/22/2007 18:28:32 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 4696-1:2007(E) ISO 2007 All rights reserved 3 6.2 Reductio
38、n tube, made of non-scaling, heat-resistant metal to withstand temperatures higher than 600 C, and resistant to deformation. The internal diameter shall be 75 mm 1 mm. A removable perforated plate made of non-scaling, heat-resistant metal to withstand temperatures higher than 600 C shall be mounted
39、in the reduction tube to support the test portion and to ensure uniform gas flow through it. The perforated plate shall be 4 mm thick, with a diameter 1 mm less than the tube internal diameter. The holes in the plate shall be 2 mm to 3 mm in diameter at a pitch centre distance of 4 mm to 5 mm. Figur
40、e 2 shows an example of a reduction tube. 6.3 Furnace, having a heating capacity and temperature control able to maintain the entire test portion, as well as gas entering the bed, at 500 C 5 C. 6.4 Porcelain balls, having a size range between 10,0 mm and 12,5 mm and of sufficient quantity to form a
41、double-layer bed on the perforated plate. 6.5 Gas-supply system, capable of supplying the gases and regulating gas flow rates. 6.6 Tumble drum, made of steel, at least 5 mm thick, having an internal diameter of 130 mm and an inside length of 200 mm. Two equally spaced steel lifters (200 mm long, 20
42、mm high and 2 mm thick) shall be mounted longitudinally inside the drum. These may be mounted on a frame that can be inserted inside the vessel from one end. One end of the drum shall be closed and the other open. A close-fitting lid shall be held in place on the opening to ensure a dust-tight seal.
43、 The drum shall be replaced in any case when the thickness of the vessel wall is reduced to 3 mm in any area, and the lifters when their height is reduced to less than 18 mm. Figure 3 shows an example of a tumble drum. 6.7 Rotation equipment, capable of ensuring that the drum attains full speed in o
44、ne revolution, rotates at a constant speed of 30 r/min 1 r/min and stops within one revolution. The equipment shall be fitted with a revolution counter and with an automatic device for stopping the drum after a predetermined number of revolutions. 6.8 Test sieves, conforming to ISO 3310-1 or ISO 331
45、0-2 and having square apertures of the following nominal sizes: 6,30 mm; 3,15 mm and 500 m. 6.9 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
46、0 C and at a reference atmospheric pressure of 101,325 kPa (1,013 25 bar). 7.2 Reducing gas 7.2.1 Composition The reducing gas shall consist of: CO 20,0 % 0,5 % (volume fraction) CO2 20,0 % 0,5 % (volume fraction) H2 2,0 % 0,5 % (volume fraction) N2 58,0 % 0,5 % (volume fraction) Copyright Internati
47、onal Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=leee, leee Not for Resale, 11/22/2007 18:28:32 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 4696-1:2007(E) 4 ISO 2007 All rights reserved 7.2.2 Purity
48、 Impurities in the reducing gas shall not exceed: O2 0,1 % (volume fraction) H2O 0,2 % (volume fraction) 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. 7.3 Heating and cooling gas Nitrogen (N2) shall be used as the heating and cooling gas. Impurities shall not exceed 0,1 % (volume fraction). The flow r