GB/T 12598-2023 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 12598-2023 | English | 245 |
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Plastics - Ion exchange resin - Determination for the rate of sphericity after osmotic-attrition and attrition
| Valid |
| GB/T 12598-2001 | English | 319 |
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Determination for sphericity of ion exchange resins after attrition of osmotic attrition
| Obsolete |
| GB/T 12598-1990 | English | 199 |
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Ion exchange resins--Determination for strength--Osmotic-attrited method
| Obsolete |
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GB/T 12598-2023: Plastics - Ion exchange resin - Determination for the rate of sphericity after osmotic-attrition and attrition
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.080.20
CCS G 31
Replacing GB/T 12598-2001
Plastics -- Ion exchange resin -- Determination for the rate of
sphericity after osmotic-attrition and attrition
ISSUED ON: SEPTEMBER 07, 2023
IMPLEMENTED ON: APRIL 01, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 6
4 Reagents and materials ... 7
5 Instruments and equipment ... 7
6 Specimen preparation ... 9
7 Test steps ... 9
8 Result calculation and presentation ... 11
9 Precision ... 12
10 Test report ... 12
Annex A (informative) Precision ... 13
Bibliography ... 15
Foreword
This document was drafted in accordance with the rules given in GB/T 1.1-2020
"Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents".
This document replaces GB/T 12598-2001 "Determination for sphericity of ion
exchange resins after attrition of osmotic attrition". Compared with GB/T 12598-2001,
in addition to structural adjustments and editorial changes, the main technical changes
are as follows:
a) Added "saturated sodium chloride solution" and "silver nitrate indicator" to
reagents and materials (see 4.4 and 4.5 of this Edition);
b) Changed "treatment device" to "diagram of infiltration treatment column" (see
Figure 1 in 5.1 of this Edition; Figure 1 in 6.1 of Edition 2001);
c) Changed the provisions of ball mill (see 5.2 of this Edition; 6.2 of Edition 2001);
d) Changed the provisions of roller (see 5.2.2 of this Edition; 6.3 of Edition 2001);
e) Changed the provisions of porcelain ball. Added "Silicon nitride material".
Changed "mass is 10 g ± 0.1 g" to "mass is 13.4 g ± 0.2 g" (see 5.2.3 of this
Edition; 6.4 of Edition 2001);
f) Added "Sample type processing" (see 6.2 of this Edition);
g) Deleted the sieving step in "operation steps for rate of sphericity after osmotic-
attrition" (see 8.1.1 of Edition 2001);
h) Changed "add 6 ceramic balls (when measuring cation exchange resin) or 10
ceramic balls (when measuring anion exchange resin)" to "add 5 ceramic balls
(when measuring cation exchange resin) or 8 ceramic balls (when measuring
anion exchange resin)" (see 7.1.7 of this Edition; 8.1.3.2 of Edition 2001);
i) Changed "add 10 ceramic balls" to "add 8 ceramic balls" (see 7.2.1 of this Edition;
8.2.2 of Edition 2001);
j) Changed calculation and presentation of results (see Chapter 8 of this Edition;
Chapter 9 of Edition 2001);
k) Changed "tolerance" to "precision" (see Chapter 9 of this Edition; Chapter 10 of
Edition 2001).
Attention is drawn to the possibility that some of the elements of this document may be
the subject of patent rights. The issuing authority shall not be held responsible for
identifying any or all such patent rights.
Plastics -- Ion exchange resin -- Determination for the rate of
sphericity after osmotic-attrition and attrition
1 Scope
This document describes the method for determining the rate of sphericity after
osmotic-attrition and the rate of sphericity after attrition of ion exchange resin under
certain conditions of external forces.
This document is applicable to the determination of the rate of sphericity after osmotic-
attrition and the rate of sphericity after attrition for unused wet spherical ion exchange
resin. For the determination of the rate of sphericity after attrition for dry spherical ion
exchange resin, refer to this document.
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.
GB/T 5475, Methods for sampling ion exchange resins
GB/T 6682, Water for analytical laboratory use -- Specification and test methods
GB/T 31703-2015, Ceramic ball bearings -- Silicon nitride balls
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 rate of sphericity after osmotic-attrition
Use acid and alkali of a certain concentration to apply penetration force to the ion
exchange resin, and then apply pressure and friction to the ion exchange resin through
rolling. The ion exchange resin subjected to these three forces is dried until it can roll
freely and separated to obtain the percentage of the mass of spherical particles to the
total mass of the sample, which is called the rate of sphericity after osmotic-attrition.
3.2 rate of sphericity after attrition
After applying pressure and friction to the ion exchange resin by rolling, the ion
Keys:
1 - Orthoglass exchange column;
2 - Rubber or silicone gasket;
3 - Orthoglass filter plate;
4 - Stopcock.
Figure 1 -- Schematic diagram of the osmotic treatment column
5.2 Ball mill
5.2.1 Rotating device: It can drive the drum to rotate horizontally. The speed can be set
to 125 r/min±3 r/min.
5.2.2 Drum: Inner diameter is φ82.0 mm±0.2 mm. Inner drum height is 125 mm±1 mm.
It is made of stainless steel. The drum cover is tightly closed and does not leak.
5.2.3 Ceramic ball: Made of silicon nitride. Nominal diameter is 20 mm. Mass is 13.4
g±0.2 g. Other technical requirements shall comply with the requirements for grade
G20 in GB/T 31703-2015.
5.3 Filter cloth
The pore diameter is less than 0.07 mm.
5.4 Sampling tray
Enamel or stainless steel tray. The bottom is smooth without grooves. The length is 45
cm±5 cm. The width is 35 cm±5 cm.
5.5 Funnel
The caliber is 40 mm~50 mm. The outer diameter of the head is 6 mm~8 mm.
5.6 Separatory funnel
The capacity is 250 mL.
5.7 Balance
The graduation value is 1 mg.
5.8 Graduated cylinder
Nominal capacity is 100 mL. Graduation is 1 mL. Nominal capacity is 25 mL.
Graduation is 0.5 mL.
6 Specimen preparation
6.1 Sampling
Follow the method specified in GB/T 5475.
6.2 Sample type processing
Except for the sodium-type strongly acidic cation exchange resin, the chloride-type
strongly basic anion exchange resin, the weakly acidic cation exchange resin, and the
weakly basic anion exchange resin, other types of strongly acidic cation exchange resins
and strongly basic anion exchange resins shall be treated into the sodium-type and
chloride-type respectively according to the following steps:
a) Transfer 100 mL of sample to the infiltration treatment column. Add 1 L of
saturated sodium chloride solution. Pass through the ion exchange resin layer at
a flow rate of 15 mL/min~20 mL/min;
b) Wash the ion exchange resin layer with water at the same flow rate until no white
precipitate is observed when silver nitrate indicator is added to the collected 3
mL~5 mL of washing effluent;
c) The transformed samples to be tested are collected for later use.
7 Test steps
7.1 Determination of rate of sphericity after osmotic-attrition
7.1.1 Use a 25 mL measuring cylinder to measure 16 mL±0.5 mL of the specimen. Tap
the ion exchange resin until the volume is constant and read the value. Transfer to the
infiltration treatment column with water. Drain the water.
7.1.2 Close the stopcock of the osmotic treatment column. Add 25 mL of water. Adjust
the stopcock opening so that the water is completely discharged within 10 s~15 s.
7.1.3 Place a funnel (5.5) on the osmotic treatment column. Quickly pour in 25 mL of
the treatment solution in step 1 in Table 1. The ion exchange resin shall be able to flip
up and down when adding liquid and the solution shall be completely discharged within
10 s~15 s. Repeat the operation 5 times. Close the stopcock of the osmotic treatment
column. Pour in 20 mL of the same treatment solution.
7.1.4 Remove the funnel (5.5). Replace it with a separatory funnel (5.6) and add 250
mL of the treatment solution in 7.1.3 to the separatory funnel. Open the stopcock of the
osmotic treatment column. Allow the treatment solution to flow out in 10 min±30 s.
7.1.5 Close the stopcock of the grinding column. Remove the separatory funnel. Add
25 mL of water to the grinding column. Install a clean separatory funnel and add 250
mL of water to it. Open the stopcock of the grinding column and allow the water to flow
out for 5 min±15 s.
7.1.6 Use the treatment solution in step 2 of Table 1 and water according to 7.1.3~7.1.5.
7.1.7 Use 50 mL of water to transfer all the ion exchange resin treated in 7.1.6 into the
drum. Add 5 porcelain balls (when measuring cation exchange resin) or 8 porcelain
balls (when measuring anion exchange resin). Tighten the drum cap.
NOTE: Compared with GB/T 12598-2001, the adjustments made to the porcelain balls in this
document have no significant impact on the test results.
7.1.8 Fix the roller to the ball mill. Start the ball mill. The rolling time of the cation
exchange resin is 10 min±2 s. The rolling time of the anion exchange resin is 20 min±4
s.
7.1.9 Remove the drum and use water to move the drum cover and all the ion exchange
resin in the drum onto the filter cloth.
7.1.10 Dry at 60°C or air dry until the ion exchange resin particles can roll freely.
7.1.11 Transfer all the dried ion exchange resin on the filter cloth to the upper left corner
of the sampling tray. Lift the upper edge of the sampling tray and place it at an angle.
Adjust the angle of inclination so that the spherical particles roll down with gentle
vibration and the broken particles cannot roll down. Use a brush to gently move a small
part of the ion exchange resin to separate the spherical particles from the broken
particles. Brush the broken particles to the upper right corner until all the spherical
particles and broken particles are separated. In the specimen after separation, the
remaining broken particles in the spherical particles and the remaining spherical
particles in the broken particles shall be less than 50 particles, accurate to 5 particles.
7.1.12 Observe the state of the residual particles after separation. Any abnormality shall
be recorded.
7.1.13 Weigh the mass of the spherical particles (m1) and the mass of all particles
(spherical particles and broken particles) (m2) on a balance, accurate to 1 mg.
7.2 Determination of rate of sphericity after attrition
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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