was originally developed(Tyler model RX-19–1or–2).In the ca of newer devices being ud,the tester should validate the equivalency of the newer device to that of the ASTM standard tester(or its successors,for example,Tyler model RX-29)and retain the capability to cross check the results of particle size distribution analysis between the mechanical device described above and any newer sieving system.
6.Sampling
6.1Collect and prepare the granular activated carbon samples in accordance with Practice E300.
7.Procedure
7.1Stack the sieves to be ud on the bottom receiver pan in order of increasing sieve opening from bottom to top.
7.2Prepare a sample of activated carbon as follows:
7.2.1Mix the gross sample,obtained by Practice E300,by passing it through a single-stage riffle type sample splitter and recombining twice.Then pass the mixed sample through the riffle so as to obtain an approximate250-mL of sample.
7.2.2Using the apparent density apparatus described in Test Method D2854,obtain a test sample of200mL from each sample.If the apparent density is less than0.35g/cc,a50g sample will be adequate,greater than0.35g/cc,u a sample not to exceed100g.In all cas,volume of the sample should not exceed200ml.
N OTE2—If the apparent density of the sample has been determined,a calculated weight of sample equivalent to200610mL may be ud for each of the riffled samples.
7.2.3Weigh each sample to the nearest0.1g.
小书包教学设计7.3.Transfer the weighed sample to the top sieve.
7.4Install the sieve cover and transfer the asmbly to the sieve shaker.
7.5Allow the sieve asmbly to shake for10min610s with the hammer operating.
7.6Remove the sieve asmbly from the sieve shaker and quantitatively transfer,using the sieve brush,the activated carbon retained on the top sieve to a tared weighing pan and weigh to the nearest0.1g.Repeat this procedure for material retained on each sieve and the bottom receiver pan.
7.7Repeat the analysis if desired.U the repeatability tolerances listed in10.1as a guide for precision and bias. 8.Calculation
8.1Add the weights of each sieve fraction;if the sum deviates more than2.0g from the sample weight,the analys should be repeated.
8.2Calculate the particle size distribution of each sample to the nearest0.1%and the average of the two samples to the nearest0.1%as follows:
R5~F/S!3100
where:
F5sieve fraction weight,
S5sum of sieve fraction weights,and
三鲜大杂烩
R5percent retained on each fraction.
8.3If effective mean particle diameter is of interest,it may be calculated from the following equation by using the percent retained in each sieve fraction from the particle size distribu-tion analysis.See Table1.
P5R3N
Effective MPD~mm!5
(P
100
where:司马迁发愤写史记
R5percent retained in a sieve fraction,
N5factor for a given sieve fraction(Table
1),
P5effective mean particle size of a given
sieve fraction,and
Effective MPD5effective mean particle diameter of the
sample.
8.3.1See Table2for an example of effective MPD calcu-lation.
8.4If effective size and uniformity coefficient are of inter-est,they may be calculated as shown in Table3from the cumulative total of the percent passing through each sieve.
8.4.1Plot the cumulative percentages of the particle size versus the size of the sieve openings in millimeters on probability–logarithmic graph paper(e Fig.1).The sieve size openings can be obtained from Specification E11.See Table1.
8.4.2Determine the effective size by reading the screen size opening in mm corresponding to the point where the curve intercts the10%passing value.See Fig.1.
8.4.3Calculate the uniformity coefficient by reading the screen size opening in millimetres corresponding to the point where the curve intercts the60%passing value and dividing this value by the effective size value from8.4.2,for example: uniformity coefficient5
value~mm!@60%interction
value~mm!@10%interction
N OTE3—The lower the uniformity coefficient value,the more uniform the granular activated carbon.If all the particles were exactly the same size,the uniformity coefficient would be1.
9.Report
9.1Report the following information:
9.1.1Source of the sample,
9.1.2Type or grade designation,
9.1.3Name of the carbon supplier,
TABLE1Factors for Calculating the Effective Mean Particle
Diameter
U.S.S.
李忠胜Sieve No.
Mean Opening,
(N)mm
U.S.S.
Sieve No.
Mean Opening,
(N)mm +4 5.74203300.72
436 4.06253300.65
曹操怎么死的
438 3.57303350.55
638 2.87303400.51
足球男孩8310 2.19353400.46
8312 2.03403450.39
10312 1.84403500.36
12314 1.55453500.33
12316 1.44503600.27
14316 1.30503700.25
16318 1.10603700.23
16320 1.02703800.19新年畅想作文
18
3200.927031000.18 203250.788031000.16
9.1.4Supplier lot or batch number,or both, 9.1.5Nominal particle size,
9.1.6Particle size distribution,
9.1.7Report the weight of sample tested,
9.1.8Effective mean particle diameter(optional),
9.1.9Effective size(optional),
9.1.10Uniformity coefficient(optional),
9.1.11Name of the agency and technician performing the test,and
9.1.12Sample identification number and date of the test.
10.Precision and Bias
10.1Repeatability—Duplicate analys by the same opera-tor should not be considered suspect unless they differ by more than the amounts shown as follows:
Repeatability Tolerances
Total Weight on Sieve,g Maximum Deviation,g 1or less0.2
1to50.5
5to10 1.0
10to100 2.0
10.2Reproducibility—Results submitted by each of two laboratories shall not be considered suspect unless they differ by more than the amounts shown as follows:
Repeatability Tolerances
Total Weight on Sieve,g Maximum Deviation,g 1or less0.3
1to50.7
5to10 1.5
10to100 3.0
N OTE4—The repeatability and reproducibility in Section10were determined under the conditions of the initial standard.The current revision’s repeatability and reproducibility may not necessarily be the same.The precision and bias of this revid test method will be investigated.
TABLE2Example of Effective MPD Calculation Using8330
Mesh Material AB
U.S.S. Sieve No.
Percent
Retained
Mean Opening
(mm)
Weighted
Average
+88.0 2.8723.0 831231.4 2.0363.7 1231627.2 1.4439.2 1632021.5 1.0221.9 203309.10.72 6.6
2.80.51 1.4
100.0155.8 A
Effective MPD~mm!5155.8
100
51.558
B The mean particle size of each sieve fraction is assumed to be the average of the sieve opening in millimetres through which the material has pasd and the sieve opening in millimetres on which the material was retained.In the ca of particles larger than tho measured,the mean particle size of this fraction is assumed to be the average of the opening of the sieve actually ud and that of the n
ext larger sieve in the=2ries.In the ca of particles smaller than the opening of the smallest sieve,the mean particle size of this fraction is assumed to be the average of the opening of the smallest sieve and that of the next smaller sieve in the=2ries.See Table1for lists of the mean opening in millimetres for various sieve fractions.
TABLE3Effective Size and Uniformity Coefficient
U.S.S. Sieve No.Opening
(mm)
Percent
Retained
On Sieve
Cumulative Percent
Passing through
柳绿桃红Sieve
8 2.368.092.0 12 1.7031.460.6 16 1.1827.233.4
200.8521.511.9 300.609.1 2.8−30... 2.80.0
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19428.FIG.1Cumulative Particle Size Distribution
Curve
