Determination of magnetic foreign metal particles in lithium carbonate, lithium hydroxide monohydrate and lithium chloride―Cleanliness meter test method
GB/T 45328-2025 Determination of magnetic foreign metal particles in lithium carbonate, lithium hydroxide monohydrate and lithium chloride―Cleanliness meter test method English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS 77.040.99
CCS H 20
National Standards of the People's Republic of China
GB/T 45328-2025
Determination of magnetic foreign metal particles in lithium carbonate, lithium hydroxide monohydrate and lithium chloride - Cleanliness meter test method
碳酸锂、单水氢氧化锂、氯化锂中磁性异物金属颗粒的测定 洁净度仪测试法
(English Translation)
Issue date: 2025⁃02⁃28 Implementation date: 2025⁃09⁃01
Issued by the State Administration for Market Regulation
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Test conditions
6 Reagents or materials
7 Instruments and equipment
8 Sample
9 Test procedure
10 Processing of test data
11 Precision
12 Test report
Determination of magnetic foreign metal particles in lithium carbonate, lithium hydroxide monohydrate and lithium chloride - Cleanliness meter test method
1 Scope
This document describes the method of testing the content of magnetic foreign metal particles in lithium carbonate, lithium hydroxide monohydrate, lithium chloride with a cleanliness meter.
This document is applicable to the determination of the content of magnetic foreign metal particles in lithium carbonate, lithium hydroxide monohydrate, and lithium chloride. The measurement range is: 10 pieces/kg ~ 500 pieces/kg.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions 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 6682 Water for analytical laboratory use - Specification and test methods
GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values
GB/T 25915.1-2021 Cleanrooms and associated controlled environments - Part 1: Classification of air cleanliness by particle concentration
GB/T 41481-2022 Road vehicles - Cleanliness of components and systems
3 Terms and definitions
The terms and definitions defined in GB/T 41481-2022 and the following are applicable to this document.
3.1
particle standard
standard particles with known shape and size for detection and calibration of optical analysis systems
4 Principle
The sample is dispersed in demagnetizing water in a clean room, and the magnetizable magnetic foreign metal particles in the sample are adsorbed and enriched by a magnetic rod sleeved with a heat-shrinkable sleeve. After the magnetic rod is separated from the heat-shrinkable sleeve, the magnetizable magnetic foreign metal particles on the sleeve are collected through a filter membrane. The particles on the filter membrane are scanned and analyzed by a non-approximate algorithm on the cleanliness meter.
5 Test conditions
The test shall be carried out in a clean room whose cleanliness meets the requirements of ISO 8 in GB/T 25915.1-2021.
6 Reagents or materials
Unless otherwise specified, only reagents of superior grade purity and above were used in the assay.
6.1 Demagnetization water: GB/T 6682, Grade I, adsorbed with magnetic rod [magnetic induction intensity not less than 1.2 T (12 000 Gs)] for 5min.
6.2 Hydrochloric acid (1+1).
6.3 Ceramic scissors (or ceramic pocket knives).
6.4 Plastic stirring barrel: volume 10L, (diameter × height) 246mm × 325mm.
6.5 Heat shrinkable sleeve: diameter 25mm, wall thickness 0.31 mm, width 41mm.
6.6 Sealing film: PE breakpoint plastic wrap 20 cm × 10 cm.
6.7 Filter membrane (aqueous system): pore diameter 5 μm, diameter 47 mm.
6.8 Slide: size 70 mm × 70 mm, viewable area 55 mm × 55 mm.
6.9 Magnetic rod [magnetic induction intensity not less than 0.6 T (6 000Gs)]: (diameter × length) 24mm × 240mm, magnetic pitch 20mm.
6.10 Magnetic rod [magnetic induction intensity not less than 1.2 T (12 000 Gs)]: (diameter × length) 24mm × 240mm, magnetic pitch 20mm.
6.11 Magnetic block [magnetic induction strength not less than 0.6 T (6 000 Gs)].
6.12 Particle marker A: The particle lengths are 3 000 μm, 620 μm, 420 μm, 220 μm, 170 μm, 120 μm, and 70 μm, respectively.
6.13 Particle marker B: The particle lengths are 7 μm, 10 μm, 18 μm, and 28 μm, respectively.
7 Instruments and equipment
7.1 Roller counter machine.
7.2 Circulating water vacuum pump.
7.3 Microporous membrane filter (2 000 mL).
7.4 Oven.
7.5 Ultrasonic cleaner.
7.6 Balance: The sensitivity amount was 0.01g.
7.7 Heat sealing machine.
7.8 Cleanliness tester: It shall comply with the provisions of 9.2.3 in GB/T 41481-2022.
8 Sample
Samples should be kept dry, free of caking, and stored in a desiccator.
9 Test procedure
9.1 Test sample
Weigh 1.0 kg of the sample (Chapter 8), accurate to 0.01g.
9.2 Blank test
Carry out a blank test simultaneously with the test sample.
9.3 Determination
9.3.1 Test Preparation: Place a rubber mat on the workbench and roll the magnetic bar (6.10) over it to adsorb magnetic substances.
