1、INTERNATIONAL STANDARD IS0 9033 First edition 1989-09-01 Aluminium ores - Determination of the moisture content of bulk material Minerais alumineux - DBtermination de ihumiditt! du matkriau en vrac Reference number IS0 9033 : 1989 (El Copyright International Organization for Standardization Provided
2、 by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IS0 9033 : 1989 (E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing Int
3、ernational 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 organizations, govern- mental and non-governmental, in liaison
4、 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 are circulated to the member bodies for approval before their
5、 acceptance as International Standards by the IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard IS0 9033 was prepared by Technical Committee ISO/TC 129, Aluminium ores, Annexes A and B form an integra
6、l part of this International Standard. 0 IS0 1989 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 microfilm, without permission in writing from the publisher. International Organization f
7、or Standardization Case postale 56 l CH-1211 Genbve 20 l Switzerland Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-tNTERNATlONAL STANDARD IS0 903
8、3 : 1989 (E) Aluminium ores - Determination of the moisture content of bulk material 1 scope This International Standard specifies a method for the deter- mination of the moisture content of aluminium ores. It applies to the samples taken from bulk aluminium ores, e.g. shipments and stockpiles. Anne
9、x A specifies a method to be used when it is difficult to carry out sieving, crushing and dividing owing to the sample being adhesive or excessively wet. In this case the sample may be pre-dried until preparation can be conducted without any trouble and the pm-dried moisture content of a consignment
10、 can be determined by the procedure specified in annex A. Annex B specifies methods of correction for sprayed water and/or rainfall. In the event of the consignment being subjected to rainfall and/or sprayed water to control dust emis- sion, then the moisture content of the consignment can be cor- r
11、ected for this added water in accordance with annex B. 2 Normative references The .followjng standards contain provisions .which, through referenceinthib text, constitute provisions of this International Standard, At b) the moisture samples from each increment or sub- sample are combined to form a g
12、ross sample. 6 Procedure 6.1 Test portions The test portions prepared by the procedure specified in IS0 6140 shall be provided in sealed containers and shall have the minimum masses specified in table 1. When the drying oven (4.2) cannot accommodate the larger test portions, the test portion may be
13、divided into several parts for drying. Divide the portion into the minimum number of parts possible, taking care to avoid a change in moisture content. NOTE - In no case shall the minimum mass of a part be less than 1 kg. Aiternatively, to avoid dividing large test portions into parts for drying, mo
14、isture determinations may be carried out on in- dividual increments or subsamples as taken, provided the sum of the masses of all the increments or subsamples exceeds the mass of the test portions given in table 1. 6.2 Number of determinations Moisture determination may be carried out in one of the
15、follow- ing ways: a) Where moisture samples from individual increments or subsamples are analysed separately, one moisture deter- mination shall be carried out on each subsample. 1) To be published. Copyright International Organization for Standardization Provided by IHS under license with ISONot fo
16、r ResaleNo reproduction or networking permitted without license from IHS-,-,-IS0 9033 : 1989 (E) NOTE - If there are fewer than four subsamples per consignment, duplicate test portions shall be prepared from each subsample and anaiysed. b) Where the moisture samples from each subsample are combined
17、to form a gross moisture sample, four test por- tions shall be prepared. Moisture determinations shall be carried out on two of the test portions with the remaining two test portions kept in reserve. 6.3 Drying of test portion Weigh. the container and. aluminium ore test portion. before opening*ihe
18、container (as received). Weigh the clean, dry drying pan (4,l). Transfer the aluminium ore to the drying pan and spread the ore evenly to a depth not exceeding that specified in table 1. Place the drying pan with the ore together with the container and lid (if any) plus any adhering particles of ore
19、, in the oven (4.2) and maintain at a temperature of 105 OC + 5 OC for the minimum drying time specified in table 1. NOTE - The dtying pan should be placed on a shelf within the oven and not on the floor of the oven. it should not touch the sides of the oven. Remove the container and lid, drying pan
20、 and ore from the oven and weigh immediately. Return the container and lid, drying pan and ore to the oven and maintain at a temperature of 105 OC f 5 OC for a further 2 h. Remove the container and lid, drying pan and ore from the oven and weigh, These two weighings should agree to within the limits
21、 specified in table 1. If they do not, the 2 h drying and weighing should be repeated until this criterion is achieved. When the masses agree to within the specified limits, record the mass of the dry container plus lid plus drying pan plus dried ore. Brush outanypre adhering to the container and we
22、igh the dry container plus lid, Table 1 - Requirements for the determination of moisture llominal ,op size Layer thick- of ore ness mm GO 45,0 31,5 z,4 16,0 11,2 mm 70 50 35 25 20 13 Minimum mass kg 110 40 14 5 2 1 Maximum allowable difference between #ubsequent AcctycY Minimun drying weighings weig
23、hing time of dried samples 9 g h 110 10 16 40 4 12 14 1 8 5 0,5 6 2 02 4 1 081 4 7 Expression of results 7.1 Moisture content of test portion Calculate the moisture content of the test portion from the equation : (ml + m2 - mg) tvj = x loo (ml - nq) where wi is the moisture content, as a percentage
24、by mass, of the test portion ; ml is the initial mass, in kilograms, of the container, lid and test portion ; m2 is the mass, in kilograms, of the drying pan; m3 is the dry mass, in kilograms, of the container, lid, dty- ing pan and test portion ; rn4 is the mass, in kilograms, of the dry empty cont
25、ainer and lid, Masses shall be recorded to the nearest 1 g, except for the 110 kg sample where the mass shall be recorded to the nearest 10 g. 7.2 Moisture content of consignment 7.2.1 Moisture samples from each increment or subsample analysed separately The moisture content of a consignment shall b
26、e calculated using the following equation : k c Piwi /=I w=- k c flui i=l where w is the moisture content, as a percentage by mass, of the consignment; k is the number of subsamples into which the consign- ment has been divided ; ,Ui is the mass, in tonnes, of the ith subsample; w, is the moisture c
27、ontent, as a percentage by mass, of the ith subsample (test portion). 7.2,2 Moisture samples combined to form a gross sample if the moisture determinations carried out on each of the duplicate test portions in 6.2 b) do not differ by more than 0,3 % absolute, the reserve test portions may be discard
28、ed, and the moisture content of the consignment calculated from the equation Wjl + wj2 tv = 2 where Wil and tvi2 are the moisture contents, as percentages by mass, of test portions 1 and 2 respectively. Copyright International Organization for Standardization Provided by IHS under license with ISONo
29、t for ResaleNo reproduction or networking permitted without license from IHS-,-,-IS0 9033 : 1999 (El If the values wil and Wi2 differ by more than 0,3 % (m/m), repeat the determination (6.3) on the remaining two test portions. If these agree within 0,3 % (m/w), calculate the moisture content of the
30、consignment as the mean of the results of the duplicate determinations. If these two results do not lie within 0,3 % (ntlr), take all four results, reject the highest and lowest values, and calculate the moisture content of the consignment as the mean of the re- maining two results. 7.3 Correction f
31、or rainfall and sprayed water Corrections for rainfall and sprayed water shall be made by the procedure specified in annex 8. 7.4 Calculation of final result The result as obtained in 7.2.1 or 7.2.2 shall be calculated to the third decimal placeand rounded off to the first decimal place as follows :
32、 a) when the figure in the second decimal place is less than 5, it is discarded and the figure in the first decimal place is kept unchanged; b) when the figure in the second decimal place is 5 and there are figures-other than 0 in the third decimal place, or when the figure in the second decimal pla
33、ce is greater than 5, the figure in the first decimal place is increased by one; c) when the figure in the second decimal place is 5 and there are no figures other than 0 in the third decimal place, the 5 is discarded and the figure in the first decimal place is kept unchanged if it is 0,2,4, 6 or 8
34、 and is increased by one ifitis1,3,5,7or9. Test report The test report shall include the following information : a) details necessary for the identification of the sample; b) reference to this International Standard; c) result of the test; d) reference number of the results; e) any characteristics n
35、oticed during the determination and any operations not specified in this International Stan- dard which may have had an influence on the result. Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted withou
36、t license from IHS-,-,-IS0 9033 : 1989 (EI Annex A (normative) Determination of moisture content of adhesive or wet aluminium ore A.1 General When it is difficult to conduct sieving, crushing and dividing owing to the sample being adhesive or excessively wet, the samplemay be pre-dried irntil prepar
37、ation can be conducted without any trouble. The ore should not be overdried to the point where it is likely to reabsorb moisture during subsequent processing. This point should be determined by experimentation for each type of aluminium ore. A,2 Procedure and expression of results Determine the init
38、ial mass of the test sample, spread the test sample in a uniform thickness and dry it by air-drying or in a drying apparatus with a temperature no higher than 105 “C. After drying, again determine the mass of the test sample and calculate the pre-dried moisture content from the following equation :
39、m6 - 4 WP =-x100 m5 where wp is the pre-,dde,d moisture content, as a percentage by mass, of the test portion ; m5 is the initial mass, in grams, of the test sample; 1116 is the mass, in grams, of the test sample after pre- drying. Prepare the test portions for moisture measurement from the pre-drie
40、d sample according to clause 6 and then determine the drying loss of the test portion according to clause 7. Caiculate the additional moisture content, as a percentage by mass, according to 7.1. The total (as received) moisture content is calculated from the Following equation : wj = wp t loo - wp 1
41、00 x wj where Wi is the additional moisture content, as a percentage by mass, obtained according to 7.1 after pre-drying; Wj is the total moisture content of the test sample; wp is as defined above. Determine the moisture content of the consignment from the equation : k c Pj Wj w=j=l k c lui j=l whe
42、re w is the moisture content, as a percentage by mass, of the consignment; k is the number of subsamples into which the consign- ment has been divided ; /Yj is the mass, in tonnes, of thejth subsample; kVj is the moisture content, as a percentage by mass, cor- rected for pre-dried moisture, of the j
43、th subsample (test portion). Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IS0 9033 : 1989 (E) Annex B (normative) Correction for sprayed water and/or rainfall 8.1 Scop
44、e This annex deals with the corrections to be made to the moisture content of a consignment of aluminium ore to take in- w is the mean value of the moisture content, expressed as a percentage by mass; as determined in 7.2; rti7 is the mass, in tonnes, of sprayed water; m8 is the mass, in tonnes, of
45、the consignment; f is the factor taking into account water lost during spray- ing. The value off is decided by commercial agreement between the parties concerned. A value off = 1 indicates that no loss has occurred. B.2.5 Calculation of moisture content corrected for sprayed water on discharge The f
46、inal moisture content, expressed as a percentage by mass, shall be calculated from the following equation : ws = w - (loo - w) x “7 x f m8 where !vs, IV, rn7, itis and f are as defined in 8.2.4. 8.3 Corrections for rainfall 8.3.1 Principle Determination of the moisture content of the consignment fro
47、m the as-tested moisture content, by allowing for the effects of rainfall into the vessels hold(s) and onto the handling equip- ment during the handling operations. B.3.2 Effective area exposed to rainfall The effective area exposed to rainfall shall be calculated by adding up the areas specified in
48、 8.3.2.1 to 8.3.2.3, rounded to the nearest 1 m2, Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IS0 9033 : 1989 (E) B.3.2.1 Hold(s) The open area, in square metres, of
49、the hold(s) in which the consignment is exposed to rainfall shall be calculated on the basis of the drawings provided on board the carrying vessel. B.3.2,2 Surge hopper(s) The open area, in square metres, of the hopper(s) used for transportation of the consignment and exposed to rainfall shall be calculated on the basis of drawings of the hopper(s). B.3.2;3 Belt conveyor(s) The open area, in square metres, of the belt conveyor(s) shall be calculated b
