1、INTERNATIONAL STANDARD ISO 3852 Third edition 2007-09-01 Reference number ISO 3852:2007(E) ISO 2007 Iron ores for blast furnace and direct reduction feedstocks Determination of bulk density Minerais de fer pour charges de hauts fourneaux et pour procds par rduction directe Dtermination de la masse v
2、olumique apparenteISO 3852:2007(E) ii ISO 2007 All rights reserved 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 typefaces which are embedded are licensed to and installed
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5、e 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, electronic or mechanical, including photocopying and microfilm, w
6、ithout 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.org Web www.iso.org Published in SwitzerlandISO 3852:2007(E)
7、ISO 2007 All rights reserved iii Contents Page 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Principle 1 5 Sampling, sample preparation and preparation of test portions 2 6 Apparatus . 2 7 Procedure . 3 8 Expression of results 3 9 Test report 4 10 Verification . 4 Annex A (normative
8、) Flowsheet of the procedure for the acceptance of test results . 6ISO 3852:2007(E) iv ISO 2007 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standa
9、rds 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, governmental and non-governmental, in liaison with ISO, also tak
10、e 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/IEC Directives, Part 2. The main task of technical committees is
11、 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 member bodies casting a vote. Attention is drawn to the possibilit
12、y 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 3852 was prepared by Technical Committee ISO/TC 102, Iron ore and direct reduced iron, Subcommittee SC 3, Physical testing. This thir
13、d edition cancels and replaces the second edition (ISO 3852:1988), which has been revised to homogenise with other physical test standards.ISO 3852:2007(E) ISO 2007 All rights reserved v Introduction This is one of a number of physical test methods that have been developed to measure various physica
14、l 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 laboratories. T
15、he 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 and direct reduction processes. This International Standard may be used to provide test results as part of a production quality-control system, as a
16、basis of a contract, or as part of a research project vi INTERNATIONAL STANDARD ISO 3852:2007(E) ISO 2007 All rights reserved 1 Iron ores for blast furnace and direct reduction feedstocks Determination of bulk density CAUTIONThis International Standard may involve hazardous operations and equipment.
17、 This International Standard does not purport 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 to determine the applicability of regulatory limitations prior to it
18、s use. 1S c o p e This International Standard specifies two methods of determining the bulk density of iron ores. Method 1 is applicable to natural iron ore and processed iron ore having a nominal top size of . Method 2 is applicable to any natural iron ores and processed ores, regardless of size. N
19、OTE The measured density does not necessarily represent the bulk density of compacted or stockpiled iron ores. 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 reference
20、s, the latest edition of the referenced document (including any amendments) applies. ISO 3082:2000, Iron ores Sampling and sample preparation procedures 1) ISO 3087:1998, Iron ores Determination of moisture content of a lot ISO 4701: 2) , Iron ores and direct reduced iron Determination of size distr
21、ibution 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. 4 Principle A test portion is introduced into a container of known volume until its surface is level. The bulk
22、 density is calculated as the ratio of the mass of the sample to the internal volume of the container. 1) Under revision to incorporate ISO 10836, Iron ores Method of sampling and sample preparation for physical testing. 2) To be published. (Revision of ISO 4701:1999) 40 mmISO 3852:2007(E) 2 ISO 200
23、7 All rights reserved 5 Sampling, sample preparation and preparation of test portions 5.1 Sampling and sample preparation In the case of method 1, sampling of a lot and preparation of a test sample shall be in accordance with ISO 3082. A test sample of at least of natural and processed iron ore shal
24、l be obtained. The test sample may be carried out using an as-received, air-dried or oven-dried sample. If the test is made on an oven-dried basis, dry the sample to constant mass at and cool it to room temperature before preparation of the test portions. NOTE 1 Constant mass is achieved when the di
25、fference in mass between two subsequent measurements becomes less than of the initial mass of the test sample. In the case of method 2, the test sample shall have a minimum mass of 35 tonnes, the recommended mass being 50 tonnes. NOTE 2 A test sample of mass 35 tonnes has a volume of approximately t
26、o , according to the material. 5.2 Preparation of test portions In the case of method 1, the test portions shall be obtained from the test sample using the division methods given in ISO 3082. At least 4 test portions, each of , shall be prepared from the test sample. In the case of method 2, the tes
27、t sample itself is used as a test portion. 6 Apparatus 6.1 General The test apparatus shall comprise a) ordinary laboratory equipment, such as an oven, hand tools and safety equipment, b) small container, c) large container, and d) a weighing device. 6.2 Method 1 6.2.1 Small container, made of metal
28、, cylindrical in form, and having an internal diameter of and an internal height of (inner volume: approximately ). The container wall and bottom shall have sufficient thickness to ensure their rigidity during the test. The container shall be reinforced by a steel band around the outside periphery a
29、t the top, and shall have two handles, apart, attached to the outer surface by welding. A carriage or other suitable device may be provided to facilitate its transportation within the laboratory. The volume of the container shall be determined with a precision of using potable water of known density
30、. 6.2.2 Weighing device, capable of weighing the test sample and test portions and having a sensitivity ofor better. 600 kg 105 C 5 C 0,05 % 14 m 3 23,6 m 3 150 kg 0,15 kg 400 mm2mm 400 mm2mm 0,05 m 3 180 0,1 L 1/1 000ISO 3852:2007(E) ISO 2007 All rights reserved 3 6.3 Method 2 6.3.1 Large container
31、, such as a truck or railway wagon, of regular geometrical shape, with smooth inner surfaces of the walls and bottom, and in good general condition. The container shall have sufficient capacity to hold, when filled, a minimum of of test sample and a minimum height of the test sample bed of . The min
32、imum length, width and height shall be 10 times the maximum particle size of the test portion. 6.3.2 Weighing device, preferably of platform type, capable of weighing the mass to be determined to a sensitivity of . 7 Procedure 7.1 Number of determinations for the test Carry out the test as many time
33、s as required by Annex A. Simultaneously with the test, the moisture content and the size distribution should be determined in accordance with the procedures specified in ISO 3087 and ISO 4701, respectively. 7.2 Density determination 7.2.1 Method 1 Small container Weigh the dried container (6.2.1) a
34、nd record the mass ( ) to the nearest . Fill the container with the sample of as-received, air-dried or oven-dried material, using a proper shovel. Empty the shovel from a height not exceeding above the surface of the material in the container. Fill the container carefully, in order to prevent evide
35、nt segregation. After filling the container to overflowing, draw a straight-edge across the top of the container to make the heaped surface level. Transfer the filled container to the weighing device (6.2.2) without loss of sample from the container. Weigh the filled container and record the mass (
36、) to the nearest . 7.2.2 Method 2 Large containers Measure the length, width and height of the container (6.3.1) with a precision of and then calculate and record its volume ( ). Weigh the empty container and record the mass ( ). With the container on a level surface, discharge the sample into it ma
37、nually or by mechanical means, taking care to avoid breakage or segregation of particles. Level off the upper surface across the top of the container, verifying by visual inspection and removing or pushing down any particles which would appear to obstruct the passage of a straight-edge if it were pu
38、lled across the top of the container. Weigh the filled container and record the mass ( ). 8 Expression of results 8.1 Calculation of the bulk density ( ) The bulk density, , expressed in , is calculated from the following formula: 10 t 500 mm 1/200 m 0 0,2 kg 50 mm m 1 0,2 kg 0,5 % V m 0 m 1 ap ap k
39、g/m 3 ap = m 1 m 0 VISO 3852:2007(E) 4 ISO 2007 All rights reserved where is the mass, in kilograms, of the empty container; is the mass, in kilograms, of the container plus sample; is the volume, in cubic metres, of the container. Record the result rounded off to 4 significant figures. The SI unit
40、for density is . However, the use of units outside the SI, which are accepted by the Comit International des Poids et Mesures (CIPM), will be practical under certain circumstances. If the unit is used, the result of the test should be expressed to 2 decimal places. 8.2 Repeatability and acceptance o
41、f test results Follow the procedure in Annex A by using the repeatability value given in Table 1. The results shall be reported to 1 decimal place. 9 Test report The test report shall include the following information: a) a reference to this International Standard, i.e. ISO 3852:2007; b) all details
42、 necessary for the identification of the sample, including a statement of the condition of the sample; i.e. as-received, air-dried or oven-dried; c) the name and address of the test laboratory; d) the date of the test; e) the date of the test report; f) the signature of the person responsible for th
43、e test; g) details of any operation and any test conditions not specified in this International Standard or regarded as optional, as well as any incident which may have had an influence on the results; h) the bulk density, , together with the qualification “as-received”, “air-dried”, or “oven-dried”
44、; i) any quality characteristics of the sample which may have had an influence on the result, i.e.: moisture content; size distribution; total iron content, if available: geological type. 10 Verification Regular checking of apparatus is essential to assure test-result reliability. The frequency of c
45、hecking is a matter for each laboratory to determine. Table 1 Repeatability ( ) Method ( ) 1 21 0 0is the mean of the replicated determinations. m 0 m 1 V kg/m 3 tonne/m 3 1 000 kg/m 3 = 1 tonne/m 3 = 1 kg/L r r kg/m 3 0,05 ap ap apISO 3852:2007(E) ISO 2007 All rights reserved 5 The conditions of th
46、e following items shall be checked: weighing device; container. It is recommended that internal reference material be prepared and used periodically to check test repeatability. Appropriate records of verification activities shall be maintained.ISO 3852:2007(E) 6 ISO 2007 All rights reserved Annex A (normative) Flowsheet of the procedure for the acceptance of test results : see Table 1. r. 7 ISO 3852:2007(E) ICS 73.060.10 Price based on 6 pages ISO 2007 All rights reserved
