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GB/T 45651-2025: Recycling raw materials for neodymium iron boron by roasting process
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT45651-2025
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.120.99
CCS H 65
Recycling Raw Materials for Neodymium Iron Boron by
Roasting Process
Issued on: APRIL 25, 2025
Implemented on: NOVEMBER 1, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative References... 4
3 Terms and Definitions... 5
4 Grading, Code and Symbol... 5
5 Technical Requirements... 6
6 Test Methods... 7
7 Inspection Rules... 8
8 Marking, Packaging, Transportation, Storage, and Accompanying Documents... 9
Appendix A (Informative) Example of Typical Recycling Raw Materials for
Neodymium Iron Boron by Roasting Process... 12
Appendix B (Informative) Analytical Method of Ratio of Oxide for the Recycling Raw
Materials for Neodymium Iron Boron by Roasting Process... 13
Bibliography... 16
Recycling Raw Materials for Neodymium Iron Boron by
Roasting Process
1 Scope
This Document specifies the grading, code and symbol, technical requirements, test methods,
inspection rules, marking, packaging, transportation, storage, and accompanying
documentation for recycling raw materials for neodymium iron boron by roasting process.
This Document applies to recycling raw materials for neodymium iron boron by roasting
process produced using the oxidation roasting process and used as raw materials for the
production of rare earth products.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB/T 12690.5 Chemical analysis methods for non-rare earth impurities of rare earth metals
and their oxides - Part 5.Determination of cobalt, manganese, lead, nickel, copper, zinc,
aluminum, chromium, magnesium, cadmium, vanadium and iron contents
GB/T 12690.19 Chemical analysis methods for non-rare earth impurities of rare earth
metals and their oxides - Part 19.Determination of arsenic and mercury
GB/T 21524 Particle size determination of inorganic chemical products - Sieving method
SN/T 0570 Rules for the Inspection of Radioactive Contamination of Imported Recycling
Materials
XB/T 612.1-2019 Chemical analysis methods of scraps of neodymium iron boron - Part 1.
Determination of total rare earth oxides content
XB/T 612.2 Chemical analysis methods of neodymium iron boron scraps - Part 2.
Determination of fifteen rare earth oxide relative contents - Inductively coupled plasma
spectral method
XB/T 612.3 Chemical analysis methods of scraps of neodymium iron boron - Part 3.
Determination of boron, cobalt, aluminum, copper, chromium, nickel, manganese,
titanium, calcium, magnesium contents - Inductively coupled plasma atomic emission
spectrometry
XB/T 612.4 Chemical analysis method of NdFeB waste - Part 4.Determination of fluorine
content - Ion selective electrode method
XB/T 617.4 Chemical analysis methods of neodymium iron boron alloy - Part 4.
Determination of iron content. The potassium dichromate titrimetry
3 Terms and Definitions
For the purposes of this Document, the following terms and definitions apply.
3.1 Recycling raw materials for neodymium iron boron by roasting process
The raw materials that after the recycled materials from NdFeB production and processing and
the recycled old NdFeB magnets are processed through oxidizing roasting process and used for
the production of rare earth products.
3.2 Oxidizing roasting
The process of heating the material below its melting point and in an oxidizing atmosphere to
convert it into oxides.
3.3 Ratio of oxide
Oxidation degree of the recycling raw materials for neodymium iron boron by roasting process.
NOTE. Expressed as the mass percentage of trivalent iron to total iron.
4 Grading, Code and Symbol
4.1 Grading
According to the total amount of rare earth oxide (REO) in the recycling raw materials for
neodymium iron boron by roasting process, the recycling raw materials for neodymium iron
boron by roasting process are divided into Grade-I, Grade-II and Grade-III products.
4.2 Code and symbol
4.2.1 The code for the recycling raw materials for neodymium iron boron by roasting process
consists of three levels. the first level represents recycling raw materials, represented by the
initials "RM" of Recycling materials in English; the second level represents neodymium iron
boron, represented by the element symbol NdFeB; the third level represents grading,
represented by the numbers 1, 2, and 3, representing Grade-I, Grade-II, and Grade-III products
respectively.
4.2.2 The symbol for the recycling raw materials for neodymium iron boron by roasting process
shall be expressed in the order of the document number and code.
EXAMPLE.
The symbol GB/T 45651-RM-NdFeB-2 indicates Grade-II recycling raw materials for neodymium iron
boron by roasting process that comply with the requirements of this Document.
5 Technical Requirements
5.1 Appearance quality
The recycling raw materials for neodymium iron boron by roasting process shall be red or
brown (see Appendix A), powdery, free of agglomerates, clean, uniform, and free of visible
foreign matter, including sawdust, plastic shavings, sand, fiber dust, etc., excluding packaging.
5.2 Radioactive contamination
The gamma radiation dose equivalent rate of the recycling raw materials for neodymium iron
boron by roasting process shall not exceed the local natural radiation background value + 0.25
μSv/h.
5.3 Chemical composition
The chemical composition of the recycling raw materials for neodymium iron boron by roasting
process shall comply with the provisions of Table 1.
5.4 Ratio of oxide
The ratio of oxide of the recycling raw materials for neodymium iron boron by roasting process
shall be no less than 60.00%.
5.5 Particle size
The weight proportion of the recycling raw materials for neodymium iron boron by roasting
process with a particle size less than 0.85 mm (20 mesh) shall be no less than 95%.
6 Test Methods
6.1 Appearance quality
Visual inspection under natural scattered light.
6.2 Radioactive contamination
The test method of the radioactive contamination shall be conducted in accordance with the
provisions of SN/T 0570.
6.3 Chemical composition
6.3.1 The analysis method for REO shall be conducted in accordance with Method 1 in XB/T
612.1-2019.
6.3.2 The total content of Pr6O11, Nd2O3, Tb4O7, Dy2O3, Gd2O3, and Ho2O3 is calculated from
the content of the individual rare earth oxides of Pr6O11, Nd2O3, Tb4O7, Dy2O3, Gd2O3, and
Ho2O3, i.e., total rare earth oxide content × the proportion of each individual rare earth oxide ×
100%. The analysis method of the proportion of rare earth oxides shall be conducted in
accordance with the provisions of XB/T 612.2; and the calculated value shall be rounded-off to
two digits after the decimal point.
6.3.3 The analysis method of Fe content shall be conducted in accordance with the provisions
of XB/T 617.4.
6.3.4 The analysis method of B content shall be conducted in accordance with the provisions
of XB/T 612.3.
6.3.5 The analysis method of Pb and Cd content shall be conducted in accordance with the
provisions of GB/T 12690.5.
6.3.6 The analysis method of As content shall be conducted in accordance with the provisions
of GB/T 12690.19.
6.3.7 The analysis method for F content shall be conducted in accordance with the provisions
of XB/T 612.4.
6.4 Ratio of oxide
The analysis method for ratio of oxide is shown in Appendix B.
6.5 Particle size
The analysis method for particle size shall be conducted in accordance with the provisions of
GB/T 21524.
7 Inspection Rules
7.1 Inspection and acceptance
Products shall be inspected by the supplier or a third-party inspection department commissioned
by the supplier to ensure that product quality complies with the provisions of this Document,
and accompanying documents shall be completed.
The purchaser shall inspect received products in accordance with the provisions of this
Document. If the inspection results do not comply with the provisions of this Document, the
purchaser shall submit any discrepancies to the supplier within 60 days of receipt of the
products; and the dispute shall be resolved through mutual negotiation between the purchaser
and the supplier. If arbitration is necessary, a third-party inspection department recognized by
both parties may be commissioned to conduct, and joint sampling shall be conducted by the
purchaser.
7.2 Batching
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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