ASTM D5159 - 21

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Carl 2024-09-03 22 206.75KB 5 页 10星币
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Designation: D5159 −21
Standard Guide for
Dusting Attrition of Granular Activated Carbon
1
This standard is issued under the fixed designation D5159; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This guide presents a procedure for evaluating the
resistance to dusting attrition of granular activated carbons. For
the purpose of this guide, the dust attrition coefficient, DA,is
defined as the weight (or calculated volume) of dust per unit
time, collected on a preweighed filter, in a given vibrating
device during a designated time per unit weight of carbon. The
initial dust content of the sample may also be determined.
Granular activated carbon is defined as a minimum of 90 %
being larger than 80 mesh (0.18 mm) (see Test Methods
D2867).
1.2 The values stated in SI units are to be regarded as the
standard. The inch-pound units given in parentheses are for
information only.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
2
D2854 Test Method for Apparent Density of Activated
Carbon
D2867 Test Methods for Moisture in Activated Carbon
E11 Specification for Woven Wire Test Sieve Cloth and Test
Sieves
E300 Practice for Sampling Industrial Chemicals
3. Summary of Guide
3.1 A known volume of known weight of the granular
activated carbon is placed in a sample holder and vibrated at
constant acceleration (g) for a known time. The dust is carried
by an air stream passing through the vibrating sample and is
then collected on a preweighed filter. The quantities of dust
collected in six 10-min intervals are determined by weighings
on an analytical balance.
4. Significance and Use
4.1 Three forces can mechanically degrade a granular acti-
vated carbon: impact, crushing, and attrition. Of these three,
attrition, or abrasion, is the most common cause of dust
formation in actual service. Published test procedures to
determine the “hardness” of activated carbons produce results
that in general cannot be correlated with field experience. For
example, the ball-pan hardness test applies all three forces to
the sample in a variable manner determined by the size, shape,
and density of the particles. The “stirring bar” abrasion test
measures attrition so long as the particle size is smaller than 12
mesh. There is some evidence, however, that the results of this
test method are influenced by particle geometry. The procedure
set forth in this guide measures the effect of friction forces
between vibrating or slowly moving particles during the test
and may be only slightly dependent on particle size, shape, and
density effects.
5. Apparatus
5.1 Vibrating Table, capable of providing an RMS (root
mean square) acceleration of 40 m/s/s (4 g).
5.2 Test Cell, such as shown in Fig. 1, preferably made of
aluminum or other electrically conductive material.
5.3 Piezoelectric Accelerometer, capable of measuring an
RMS acceleration chosen by the user. A value of 40 m/s/s (4 g)
is suitable when using the apparatus in Figs. 1 and 2.
5.4 Signal Conditioner, to interface the accelerometer with
an AC millivolt meter, capable of producing a linear output
voltage from 0 to 1 V-ac, proportional to the acceleration.
5.5 Voltmeter, 0 to 1 V-ac.
5.6 Ammeter, ac, 0 to 1000 mA accurate to 1 mA.
1
This guide is under the jurisdiction of ASTM Committee D28 on Activated
Carbon and is the direct responsibility of Subcommittee D28.04 on Gas Phase
Evaluation Tests.
Current edition approved June 1, 2021. Published June 2021. Originally
approved in 1991. Last previous edition approved in 2020 as D5159 – 04 (2020).
DOI: 10.1520/D5159-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
1
5.7 Variable Transformer, 0to120V.
5.8 Timer Control, 0 to 120 min.
5.9 Rubber Isolation Pad, a 45 durometer neoprene rubber
pad has been found satisfactory.
NOTE 1—2
3
⁄
4
in. (69.9 mm) inside diameter by 3 in. (76.2 mm) outside diameter by
1
⁄
16
in. (1.6 mm) thick.
NOTE 2—Specification E11 wire cloth, 250 µm, stainless wire, 3 in. (76.2 mm) diameter.
NOTE 3—37 % open area, fabricated from 24 gage stainless steel with 0.45 in. (11.4 mm) diameter holes on 0.066 in. (1.68 mm) centers, square grid
3 in. (76.2 mm) diameter.
FIG. 1 Dust Attrition Cell (Full Scale)
FIG. 2 Apparatus Assembly
D5159 − 21
2
5.10 Flow Meter, with flow control valve capable of con-
trolling air flow at the flow rate chosen by the user of this
guide. A flow of about 7 L/min is suitable when using the
apparatus of Figs. 1 and 2.
5.11 Particulate Filter, sized to interface with test cell,
capable of capturing carbon fines. Several commercial glass
fiber filters have been found satisfactory. Also effective are the
particulate filters sold for respiratory protection against paint
spray or other particulate hazards.
5.12 Graduated Cylinder, 100-mL capacity.
5.13 Analytical Balance, capable of weighing to 0.1 mg.
6. Sampling, Test Specimens, and Test Units
6.1 Guidance in sampling granular activated carbon is given
in Practice E300 (see also 8.1).
7. Preparation of Apparatus
7.1 Assemble a test cell similar to that shown in Figs. 1-3.
7.2 Mount the accelerometer at the center of the cover plate.
7.3 Place the vibrator test assembly on the vibration isola-
tion pad so that the cover plate of the test cell is level.
7.4 Connect the accelerometer lead to the signal
conditioner, then connect the output of the signal conditioner to
the microvolt meter (see Fig. 4).
7.5 Connect the accelerometer lead to the signal
conditioner, then connect the output of the signal conditioner to
the microvolt meter (see Fig. 4).
7.6 Connect the vibrator to the variable transformer and
connect the transformer to a timer control with the milliam-
meter in series (see Fig. 4).
7.7 Connect the air outlet of the attrition test cell to the flow
meter, and connect the flow meter to a vacuum source (see Fig.
4).
8. Procedure
8.1 Measure a known volume (about 100 mL) of the sample
into a tared, graduated cylinder using the method and apparatus
described in Test Method D2854 and weigh to the nearest
0.1 g. If the average nominal particle size of the sample is less
than 12 mesh, a 50-mL sample may be preferred.
8.1.1 Reproducibility in duplicate or quadruplicate determi-
nations may be improved by taking two or four times the
volume of the given sample and making one subdivision by
careful coning and quartering.
8.1.2 A second convenient procedure is to use a miniature
sample divider and divide the sample once or twice as desired.
Mount micro-splitter for mineral sampling on a vibrating table
to ensure an equal division of all particles, especially the fines.
8.2 Calculate the apparent density of the sample using Test
Method D2854.
8.3 Quantitatively transfer the sample into the sample
holder section of the test cell.
8.4 Weigh the particulate filter to 0.1 mg.
8.5 Insert the weighed particulate filter into the apparatus.
8.6 Assemble the test cell assembly and secure it to the
vibrator table.
8.7 Set the timer control to 10 min. Note—10 min is used
only as an example to illustrate the procedure for calculating
DA in Section 9. The user of this guide may select another time
interval.
8.8 Start the air flowing, then adjust to draw the desired
volumetric flow of air through the sample.
8.9 Increase the voltage to the vibrator from “zero” to
produce the RMS acceleration chosen by the user. An accel-
eration value of about 40 m/s/s, (4 g) is often used.
8.10 Vibrate the sample for 10 min or other period (see 8.7).
8.11 Carefully remove and weigh the particulate filter to
0.1 mg.
8.12 Insert a second weighed particulate filter.
8.13 Before returning the sample holder, place a flat piece of
glass over the top and hold firmly in place while slowly
inverting the sample several times in order to redistribute
particles that may have become bed-locked or segregated
during vibration.
FIG. 3 Apparatus Air Flow Configuration
D5159 − 21
3
摘要:

ASTM D5159-21 是 ASTM 国际标准组织发布的最新版本测试方法,专门用于评估木基板材(如刨花板、中密度纤维板等)表面的耐磨性和涂层附着力。该标准通过砂纸或其他指定介质对试样进行旋转摩擦,测量表面质量变化或涂层脱落的程度,适用于家具制造、室内装修和建筑材料领域的质量控制。遵循 ASTM D5159-21 可确保产品符合国际性能要求,帮助企业优化生产工艺、减少售后投诉,并提升出口竞争力。对于从事板材研发、质检和认证的工程师而言,掌握该标准是保证产品耐久性与安全性的关键环节。

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作者:Carl 分类:国外协会 价格:10星币 属性:5 页 大小:206.75KB 格式:PDF 时间:2024-09-03

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