1、INTERNATIONAL STANDARD IS0 6138 First edition 1991-09-15 Aluminium ores - Experimental determination of the heterogeneity of constitution Minerais alumlneux - Ddtermination exptirimentale de lht!t x is the mean of 10 results (in percentage), hence the number of degrees of freedom Is nine; n is the n
2、umber of particles per group. The highest q value shall be retained for the cal- culation of the minimum sample mass, in accord- ance with IS0 8685 and IS0 6140. Table 1 - Number of particles or fragments per group Sieve aperture retalning the Approximate Approximate number of sieved fraction mass o
3、f aliquot particles per 0 group mm 9 n 63 650 2 45,0 600 5 31,5 320 8 22,4 150 10 i6,O 80 15 11,2 35 20 8 20 30 5,60 12 50 4 6 70 298 4 140 5 Example of typical calculation A typical calculation for determining the heterogen- eity of constitution of an ore is given in table 2. The parameter determin
4、ed Is the percentage of alumina (% A&O,) on five sieve fractions, NOTE 1 The calculations are based on the assumption that Q = 2,5 t/m3. Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without licens
5、e from IHS-,-,-IS0 6138:1991(E) Test sample No. 1 2 3 4 5 6 7 6 9 10 Mean u Sample mass (g) Estimated number of particles G Table 2 - Typical calculation Percentage of alumina (% Al,O, ) + 9,5 mm -I- 6,7 mm + 5,6 mm + 4,75 mm + 3,35 mm 54,84 55,65 55,43 55,48 54,41 57,69 56,16 55,97 55,35 54,30 56,1
6、7 53,61 55,48 55,42 54,72 56,22 54,23 56,59 55,19 54,88 53,47 55,54 56,lO 55,67 54,45 52,04 54,53 55,45 55,32 54,79 52,89 55,71 55,76 55,33 54,92 56,28 54,06 55,54 55,18 54,75 55,22 53,97 55,76 55,13 55,02 53,35 54,33 56,34 55,70 54,82 54,82 54,78 55,84 55,38 54,71 1,818 0,895 0,401 0,195 0,239 16,O
7、 38,1 43,7 41,i 51,I I4 97 190 293 1038 12,41 16,09 9,90 6,03 14,07 3 Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IS0 6138:1991(E) UDC 553.492:620.11:539.219.1 Descriptors: minerals and ores, aluminium ores, sampling, determination, heterogeneity, sieve analysis. Price based on 3 oases Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
