ISO-7992-1992.pdf
《ISO-7992-1992.pdf》由会员分享,可在线阅读,更多相关《ISO-7992-1992.pdf(13页珍藏版)》请在三一文库上搜索。
1、INTERNATIONAL STANDARD IS0 7992 First edition 1992-08-15 Iron ores - Determination of reduction properties under load Minerais de fer - D6fermination des propriCt6.s de r6duction sous charge Reference number ISO 7992:1992(E) Copyright International Organization for Standardization Provided by IHS un
2、der license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 22:25:33 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 7992:1992(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national s
3、tandards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 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
4、organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees
5、 are circulated to the member bodies for voting. Publication as an Inter- national Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 7992 was prepared by Technical Committee ISO/TC 102, iron ores, Sub-Committee SC 3, Physical testing. Annex A
6、 forms an integral part of this International Standard. Cl IS0 1992 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and mlcrofilm, wlthout permission in writing from the publisher. Internatio
7、nal Organization for Standardization Case Postale 56 l CH-1211 Genbve 20 l Switzerland Printed in Switzerland ii Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 22:25:33 MDTNo re
8、production or networking permitted without license from IHS -,-,- IS0 7992:1992(E) Introduction This International Standard describes a test method for evaluation of the physical stability of iron ores reduced under load and under specific conditions. The specific conditions involved in this test ar
9、e isothermal heating for reduction; a test portion having a specified size and placed in a fixed bed under load; a reducing gas composed of a carbon monoxide/hydrogen/nitrogen mixture; measurement of the differential gas pressure across a bed of the test portion and measurement of the change in the
10、height of the bed. This method gives an indication of the physical stability of blast furnace burden rnaterials under conditions resembling those in the blast fur- nace. The results of this test should be considered in conjunction with the re- suits of other tests, particularly those showing the phy
11、sical behaviour of iron ores during reduction. III Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 22:25:33 MDTNo reproduction or networking permitted without license from IHS -,
12、-,- INTERNATIONAL STANDARD IS0 7992:1992(E) Iron ores - Determination of reduction properties under load 1 Scope This International Standard specifies a method for testing the physical stability of iron ores by measur- ing the change in the differential gas pressure across a bed of the test portion
13、and the change in the height of the bed during reduction under load. This International Standard is applicable to sized ores and pellets. IS0 9507:1990, iron ores - DeterminaGon of total irot, content - Titanium(/ll) chloride reduction meth- ods. IS0 9508:1990, lrorl ores - Determination of total ir
14、on content - Silver reduction titrimetric method. 3 Principle Reduction of a bed of the test portion (test bed) with specified size by a carbon/hydrogen gas mixture at a temperature of 1 050 “C, whilst applying a static load. 2 Normative references The following standards contain provisions which, t
15、hrough reference in this text, constitute provisions of this International Standard. At the time of publi- cation. the editions indicated were valid. All stan- dards are subject to revision, and pat-ties to agreements based on this International Standard are encouraged to investigate the possibility
16、 of ap- plying the most recent editions of the standards in- dicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 565:1990, Test sieves - Metal wire cloth, perfo- rated metal plate and electroformed sheet - Nominal sizes of openings. IS0 2597:1985,
17、 Iron ores - Determination of total iron content - Titrimetric methods. IS0 3081:1986, /t-on ores - Increment sampling - Manual method. IS0 3082:1987, Iron ores - Increment sampling and sample preparation - Mechanical method. IS0 3083:1986, h-on ores - Preparation of samples - Manual method. IS0 903
18、5:1989, Iron ores - Determination of acid- soluble iron content - Titrimetric method. Monitoring, at regular intervals, the loss in mass of the test portion, the differential gas pressure across the test bed and the height of the test bed. Determination of the differential pressure and the change in
19、 the height of the test bed at an 80 % de- gree of reduction. 4 Test conditions The gas volumes and flow rates used in this Inter- national Standard are measured at a temperature of 0 “C and at atmospheric pressure (101,325 kPa). 4.1 Composition of reducing gas The reducing gas shall consist of co :
20、 (40 * 0,5 %) (V/v) H, : (2 +_ 0,5 % (VI 1) N, : (58 + 0,5 “A,) (ijlf) 4.2 Purity of reducing gas Impurities in the reducing gas shail not exceed 0, : 0,l % (V/v-) H,O : 052 % (V/V) co, : 0,2 % (I/ 13 1) 1 mm Hg = 0,133 3 kPa; 1 atm = 0.101 325 MPa. Copyright International Organization for Standardi
21、zation Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 22:25:33 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 7992:1992(E) 4.3 Flow rate of reducing gas The flow rate of the reducing gas shall be main- t
22、ained at 83 I/min + 1 I/min during the test. 4.4 Temperature of the reduction test The temperature of the bed during the reduction test shall be maintained at a temperature of 1 050 “C f 10 “C. The reducing gas shall be pre- heated before entering the reduction tube. 4.5 Loading of the test portion
23、During the entire test period, the test portion shall be under a constant load of 50 kPa measured at the surface of the bed. 5 Apparatus Figure 1 shows a schematic example of the test ap- paratus which shall consist of the following. 5.1 gas supply system, capable of supplying the gases and regulati
24、ng gas flow rates. 5.2 Reduction tube, resistant to deformation, made of non-scaling heat resistant metal capable of with- standing a temperature of 1 050 “C. The inside di- ameter of the reduction tube shall be 125 mm + 1 mm. A removable perforated plate is mounted in the re- duction tube to form a
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ISO 7992 1992
链接地址:https://www.31doc.com/p-3779142.html