GB/T 24265-2014 PDF in English
GB/T 24265-2014 (GB/T24265-2014, GBT 24265-2014, GBT24265-2014)
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| GB/T 24265-2014 | English | 85 |
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Diatomite filter aid for industrial
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| GB 24265-2009 | English | 479 |
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Diatomite filter aids
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Standards related to (historical): GB/T 24265-2014
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GB/T 24265-2014: PDF in English (GBT 24265-2014) GB/T 24265-2014
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 73.080
Q 69
Replacing GB 24265-2009
Diatomite filter aid for industrial
ISSUED ON. JUNE 24, 2014
IMPLEMENTED ON. FEBRUARY 1, 2015
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Classification and marking ... 6
5 Requirements ... 6
6 Test methods ... 7
7 Inspection rules ... 11
8 Marks ... 12
9 Package, transport and storage ... 12
Appendix A ... 13
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB 24265-2009 “Diatomite filter aids”.
Compared with GB 24265-2009, the main technical changes are as follows.
- Modified the property of standard from “mandatory” to “recommendatory”,
the name from “Diatomite filter aids” to “Diatomite filter aid for industrial”;
- Modified “baked diatomite” to “calcined diatomite”; representation symbol
was modified from “BS” to “DS” as well (refer to 3.2, 3.3 of this Edition; 3.2
and 3.3 of 2009 Edition);
- Models were merged and modified from 15 to 3 (refer to 4.1.2 of this Edition;
4.1.2 of 2009 Edition);
- Modified marking mode (refer to 4.2 of this Edition; 4.2 of 2009 Edition);
- Deleted quality requirements for diatomite filter for food and medicine as
well as corresponding test methods (refer to 5.1 of 2009 Edition);
- Deleted provisions on appearance color; made appropriate modification on
requirements for microstructure (refer to Table 2 and Table 3 of 2009
Edition);
- Modified requirements for moisture indicator from “≤0.5%” to “≤3.0%” (refer
to Table 2 and Table 3 of 2009 Edition);
- Modified requirements for water soluble indicator from “≤0.5%” to “≤0.8%”
(refer to Table 2 and Table 3 of 2009 Edition);
- Modified requirements for silicon oxide from “≥85%, ≥82%, ≥80%” to “≥85%,
≥80%, ≥75%” respectively (refer to Table 2 and Table 3 of 2009 Edition);
- Deleted indicator requirements for ferric oxide, aluminum oxide, calcium
oxide, and magnesium oxide; it was modified as “Other chemical
components shall be determined by the seller and the buyer after
negotiation” (refer to Table 2 and Table 3 of 2009 Edition);
- Made appropriate modification on inspection method for microstructure
(refer to 6.1 of this Edition; 6.1 of 2009 Edition);
- Refined requirements for permeability measuring device (refer to 6.2.1 of
this Edition; 6.2.1 of 2009 Edition);
Diatomite filter aid for industrial
1 Scope
This Standard specifies terms and definitions, classification and marking,
requirements, test methods, inspection rules, marks, package, transport and
storage of diatomite filter aid for industrial.
This Standard is applicable to diatomite filter aid for industrial of which the main
raw material is diatomite and is made by calcination or flux calcination.
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
references, the latest edition of the referenced document (including any
amendments) applies.
JC/T 414 Diatomite
3 Terms and definitions
The following terms and definitions apply to this Standard.
3.1 Permeability
The volume of filtrate per filter cake thickness of per filter area at per unit time
when filtrate viscosity is 1 cP and filtration layer pressure is 101325 Pa.
3.2 Calcined diatomite
The product that is made of diatomite by calcination at 650°C ~ 1000°C,
grinding and classification.
3.3 Flux calcined diatomite
The product that is made of diatomite by adding appropriate amount of flux after
calcination at 650°C ~ 1000°C, grinding and classification.
Moisture / % ≤3.0
Water soluble / % ≤0.8
pH value (10% water
slurry value) 5.5~11.0
Tap density /(g/cm3) ≤0.53
SiO2 / % ≥85.0 ≥80.0 ≥75.0
Other chemical Determined by the seller and the buyer after negotiation
6 Test methods
6.1 Inspection of microstructure
6.1.1 Apparatus
Microscope. 20 (Objective lens) × 10 (Eye lens)
6.1.2 Test procedures
Drop a drop of distilled water on a microscope slide. Add microscale of sample.
Cover the cover slide. Place it under microscope to observe. Conduct image
processing when necessary.
6.2 Determination of permeability
6.2.1 Apparatus
Requirements are as follows.
a) Pressure measuring equipment. U type pressure gauge (measuring range
is 1000 Pa) or vacuum gauge (measuring range is 0~0.01 MPa).
b) Vacuum pump. measuring range is (0~0.01) MPa.
c) Regulator bottle. volume is about 10 L.
d) Test bottle. the fine neck diameter of #1 and #2 test bottles shall be 20
mm; fine neck height of #1 test bottle shall not be less than 50 mm. There
shall be graduation from the bottom and division value shall not be greater
than 1 mm. Fine neck outlet under the flange shall be (30~50) mm lower
than horizontal branch pipe, so as to prevent filtrate from being pumped
into regulator bottle.
e) Balance. inductance is 0.1 g.
f) Stopwatch. accuracy is 0.1 s.
distilled water along the sidewall of #1 test bottle (do not directly pour the
distilled water on filter cake). Filter it under a vacuum of 7600Pa ± 100Pa and
the filtrate volume shall be approximately 40 mL. Accurately record the
corresponding filter time t and filtrate volume V.
6.2.2.5 Repeat 6.2.2.4 and take the average of 3 times to calculate filtrate flow
Q (Q = V/t).
6.2.2.6 Accurately determine the thickness of filter cake.
6.2.2.7 Determine the temperature of distilled water during the test, and read
corresponding viscosity value by referring to Appendix A.
6.2.3 Results calculation
Calculate permeability according to equation (1).
Where,
k - Permeability, in darcy;
A - Filter area, in square centimeter (cm2);
Q - Filtrate flow (average of three test results), Q=V/t, in milliliter per second (mL/s);
t - Filtration time, in second (s);
V - Filtrate volume in filtration time t, in milliliter (mL);
η - Coefficient of viscosity, in centipoise (cP);
h - Filter cake thickness, in centimeter (cm);
P - Degree of vacuum, in pascal (Pa).
6.3 Determination of moisture
Conduct according to JC/T 414.
6.4 Determination of water soluble
6.4.1 Weigh about 5 g (make it accurate to 0.01 g) of sample and place it into
a dried 150 mL conical flask. Accurately add 50.00 mL distilled or deionized
water (pH value is 5.5 ~ 7.2). Mix well. Heat and boil it for 30 min. Stir it
7 Inspection rules
7.1 Inspection classification
7.1.1 Factory inspection
Factory inspection items are permeability, moisture and tap density.
7.1.2 Type inspection
Type inspection items include all requirements in Clause 5.
Type inspection shall be conducted for one of the following situations.
a) When new products are put into production or identification of stereotype;
b) When great changes in raw material or technique that that may affect
product quality;
c) When factory inspection results are quite different from the ones of last
type inspection;
d) When production is resumed after it is stopped for more than 3 months;
e) Conduct once every 6 months during normal production.
7.2 Batching principle
Every 500 t of diatomite filter aid for industrial of same category, same grade
and in continuous production shall be one batch. If it were less than 500 t, it
shall be regarded as one batch.
7.3 Sampling method
Regard bag as sampling unit. Use equidistant sampling. take one bag from
every n-1 bag (n=N/20; N is the total number of bags of this batch of products,
n takes integer). Use closable sampling probe to take about 100 g of sample in
this bag. Mix it to mixed sample. When batch quantity is less than 200 bags,
appropriately increase sample amount of each bag, so as to make the total
sample amount not less than 1 kg.
7.4 Sample storage
After completely mixing, the collected sample shall be divided into two portions
by coning and quartering. Respectively place them into clean and dry wild-
mouth jars. Cover the caps and label them (date of sampling, sampling person,
manufacturer’s name, factory lot and batch number and batch shall be indicated
Appendix A
(Informative)
The relationship between water temperature and viscosity coefficient
The relationship between water temperature and viscosity coefficient is shown
in Table A.1.
Table A.1 Unit. cP
Temperature
/°C 0 1 2 3 4 5 6 7 8 9
0 1.794 1.732 1.674 1.619 1.568 1.519 1.473 1.429 1.387 1.348
10 1.310 1.274 1.239 1.206 1.175 1.145 1.116 1.088 1.060 1.034
20 1.009 0.984 0.960 0.938 0.916 0.894 0.874 0.855 0.836 0.816
30 0.800 0.783 0.767 0.751 0.735 0.720 0.706 0.692 0.679 0.666
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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