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Chemical analysis methods for neodymium iron boron alloy--Part 1: Determination of total rare earth content--Oxalate gravimetry
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XB/T 617.1-2014
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Basic data | Standard_ID | XB/T 617.1-2014 (XB/T617.1-2014) | | Description (Translated English) | Chemical analysis methods for neodymium iron boron alloy--Part 1: Determination of total rare earth content--Oxalate gravimetry | | Sector / Industry | Rare Earth Metal Industry Standard (Recommended) | | Classification of Chinese Standard | H14 | | Classification of International Standard | 77.120.99 | | Word Count Estimation | 6,683 | | Date of Issue | 2014-10-14 | | Date of Implementation | 2015-04-01 | | Issuing agency(ies) | Ministry of Industry and Information Technology of the People Republic of China | XB/T 617.1-2014: Chemical analysis methods for neodymium iron boron alloy--Part 1: Determination of total rare earth content--Oxalate gravimetry
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Chemical analysis methods for neodymium iron boron alloy--Part 1. Determination of total rare earth content--Oxalate gravimetry
ICS 77.120.99
H14
China's rare earth industry standards
NdFeB alloy chemical analysis method
Part 1. Determination of the total amount of rare earth
Oxalate gravimetric method
Part 1.Determinationoftotalrareearthcontent-
Published on.2014-10-14
2015-04-01 implementation
Ministry of Industry and Information Technology of the People's Republic of China
Foreword
XB/T 617 "Chemical Analysis Method of NdFeB Alloy" is divided into 7 parts.
--- Part 1. Determination of the total amount of rare earths;
--- Part 2. Determination of the amount of fifteen rare earth elements;
--- Part 3. Determination of boron, aluminium, copper, cobalt, magnesium, silicon, calcium, vanadium, chromium, manganese, nickel, zinc and gallium - Inductively coupled plasma atomic
Shot spectroscopy
--- Part 4. Determination of iron content - Potassium dichromate titration;
---Part 5. Determination of zirconium, niobium, molybdenum, tungsten and titanium content by inductively coupled plasma atomic emission spectrometry;
--- Part 6. Determination of carbon content - high frequency - infrared absorption method;
--- Part 7. Determination of oxygen and nitrogen content Pulse-infrared absorption method and pulse-thermal conduction method.
This part is the first part of XB/T 617.
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
This part is under the jurisdiction of the National Rare Earth Standardization Technical Committee (SAC/TC229).
This section is responsible for drafting units. Beijing Nonferrous Metals Research Institute, Zhangzhou Jidong Rare Earth Group Co., Ltd., China Nonferrous Metals
Industry Standard Measurement Quality Institute.
This section drafted by. Beijing Nonferrous Metals Research Institute.
Participated in the drafting of this section. Baotou Rare Earth Research Institute, Hunan Rare Earth Metal Materials Research Institute, Zhangzhou Aikerui Chemical Metal Materials Testing
Co., Ltd., Beijing Zhongke Sanhuan High Technology Co., Ltd., Jiangxi Jinshi New Material Co., Ltd.
The main drafters of this section. Liu Bing, Liu Pengyu.
Participated in the drafting of this section. Gao Lihong, Zeng Qing, Gao Lizhen, Fan Huitao, Liu Rongli, Yao Nanhong, Chen Yu, Zhu Ni, Yu Jianyuan, Tian Li, Lan Tao,
Du Fu, Wu Hong, Tian Ronghua.
NdFeB alloy chemical analysis method
Part 1. Determination of the total amount of rare earth
Oxalate gravimetric method
1 Scope
This part of XB/T 617 specifies the method for determining the total amount of rare earth in NdFeB alloys.
This section applies to the determination of the total amount of rare earth in NdFeB alloy, the measurement range is 19.00% ~ 35.00%.
2 Principle of the method
After the sample is decomposed by acid, the rare earth is precipitated with hydrofluoric acid to separate a large amount of impurities such as iron and trace magnesium; and the rare earth is dissolved in hydrochloric acid at pH 1.8 to 2.0.
Under the conditions, rare earth is precipitated with oxalic acid to separate residual iron impurities. The rare earth oxalate is calcined to a rare earth oxide at 950 ° C to a constant weight.
3 reagents and materials
3.1 Hydrofluoric acid (ρ=1.14g/mL).
3.2 Nitric acid (ρ = 1.42 g/mL).
3.3 Perchloric acid (ρ = 1.67 g/mL).
3.4 Hydrogen peroxide (30%).
3.5 Hydrochloric acid (1 1).
3.6 Hydrofluoric acid washing solution (2 98).
3.7 Oxalic acid solution (100g/L).
3.8 Ammonia (1 1).
3.9 cresol red solution (2g/L). 2g cresol red dissolved in 1L ethanol (1 1).
3.10 Oxalic acid lotion (20g/L).
3.11 Precision pH test paper (0.5~5.0).
4 instruments
4.1 Analyze the balance to the nearest 0.0001g.
4.2 High temperature furnace, temperature >1000 °C.
4.3 Drying box.
4.4 Platinum crucible.
5 sample
Weigh immediately after sampling.
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