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GB/T 12690.2-2015: Chemical analysis methods for non-rare earth impurity of rare earth metals and their oxides -- Part 2: Determination of ignition loss content of rare earth oxides -- Gravimetric method
Status: Valid GB/T 12690.2: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 12690.2-2015 | English | 88 |
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Chemical analysis methods for non-rare earth impurity of rare earth metals and their oxides -- Part 2: Determination of ignition loss content of rare earth oxides -- Gravimetric method
| Valid |
GB/T 12690.2-2015
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| GB/T 12690.2-2002 | English | 199 |
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Chemical analysis methods for non-RE impurity of rare earth metals and their oxides -- Determination of ignition loss content of rare earth oxides -- Gravimetric method
| Obsolete |
GB/T 12690.2-2002
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| GB/T 12690.2-1990 | English | 199 |
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Lanthanum oxide--Determination of neodymium oxide, cerium oxide, praseodymium oxide, samarium oxide and yttrium oxide contents-Emission spectrographic method
| Obsolete |
GB/T 12690.2-1990
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PDF similar to GB/T 12690.2-2015
Basic data | Standard ID | GB/T 12690.2-2015 (GB/T12690.2-2015) | | Description (Translated English) | Chemical analysis methods for non-rare earth impurity of rare earth metals and their oxides -- Part 2: Determination of ignition loss content of rare earth oxides -- Gravimetric method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H14 | | Classification of International Standard | 77.120.99 | | Word Count Estimation | 4,485 | | Date of Issue | 2015-09-11 | | Date of Implementation | 2016-04-01 | | Older Standard (superseded by this standard) | GB/T 12690.2-2002 | | Regulation (derived from) | National Standard Announcement 2015 No.25 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This Standard specifies the method for the determination of rare earth oxides in the loss on ignition. This Standard applies to the determination of loss on ignition of rare earth oxides. Measuring range: 0.10% to 15.00%. | GB/T 12690.2-2015: Chemical analysis methods for non-rare earth impurity of rare earth metals and their oxides -- Part 2: Determination of ignition loss content of rare earth oxides -- Gravimetric method
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(Non - rare earth impurities in rare earth metals and their oxides chemical analysis methods - Part 2. Determination of rare earth oxides in the weight loss on ignition method)
ICS 77.120.99
H14
National Standards of People's Republic of China
Replacing GB/T 12690.2-2002
Non - rare earth impurities in rare earth metals and their oxides
Methods for chemical analysis - Part 2.
Determination of rare earth oxides in the weight loss on ignition method
rareearthmetalsandtheiroxides-Part 2. Determinationofignition
Issued on. 2015-09-11
2016-04-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
GB/T 12690 "non - rare earth impurities in rare earth metals and their oxides chemical analysis method" is divided into 18 parts.
--- Part 1. Carbon and sulfur content was measured high frequency - infrared absorption method;
--- Part 2. Rare Earth Oxides loss on ignition - Gravimetric method;
--- Part 3. rare earth oxide in water content - Gravimetric method;
--- Part 4. oxygen, nitrogen pulse measurement - infrared absorption method and pulse - heating thermal conductivity;
--- Part 5. Determination of inductance aluminum, chromium, manganese, iron, cobalt, nickel, copper, zinc, lead coupled plasma emission spectrometry;
Cobalt, manganese, lead, nickel, copper, zinc, aluminum, chromium was measured by inductively coupled plasma mass spectrometry;
--- Part 6. Determination of iron content of potassium thiocyanate, 1,10-phenanthroline spectrophotometry;
--- Part 7. Determination of silicon content - Molybdenum blue spectrophotometric method;
--- Part 8. Determination of sodium content by flame atomic absorption spectrometry;
--- Part 9. Determination of chlorine content of silver nitrate turbidimetry;
--- Part 10. Determination of phosphorus content - Molybdenum blue spectrophotometric method;
--- Part 11. Determination of magnesium content - Flame atomic absorption spectrometry;
--- Part 12. Determination of the amount of thorium;
--- Part 13. molybdenum, tungsten content was measured;
--- Part 14. Determination of titanium content;
--- Part 15. Determination of calcium;
--- Part 16. Determination of the amount of fluorine ion selective electrode;
--- Part 17. rare earth metals niobium, tantalum content of the determination;
--- Part 18. Determination of the amount of zirconium.
This section GB/T 12690 Part 2.
This section drafted in accordance with GB/T 1.1-2009 given rules.
This part is GB/T 12690.2-2002 "non - rare earth impurities in rare earth metals and their oxides gravimetric method for determination of chemical analysis
Rare Earth Oxides ignition loss "amendments. This section compared with the GB/T 12690.2-2002, major technical changes in addition to editorial changes outside
as follows.
--- Reducing the measurement range from 0.10% to 20.00% to 0.10% - 15.00%;
--- Increased quality assurance and control (see Chapter 9).
This part of the National Standardization Technical Committee of rare earth (SAC/TC229) and focal points.
This section is responsible for drafting unit. Ganzhou Nonferrous Metallurgy Research Institute.
Participated in the drafting of this section. Beijing Nonferrous Metal Research Institute, southern Jiangxi Rare Earth High-tech Co., Guangdong Zhujiang Rare Earth
Limited.
The main drafters of this section. Kwong Jing, Xiao Juan, Liu, Liang Zhijie, Guo talented woman, Zhong Ting, Lin Qing, Yang Feng, Lai Jian, Liu Pengyu, Bao Ye Lin.
This part of the standard replaces the previous release case.
--- GB/T 12690.2-2002.
Non - rare earth impurities in rare earth metals and their oxides
Methods for chemical analysis - Part 2.
Determination of rare earth oxides in the weight loss on ignition method
1 Scope
GB/T 12690 provisions of this part of the determination of rare earth oxides in the loss on ignition.
This section applies to the determination of loss on ignition of rare earth oxides. Measuring range. 0.10% to 15.00%.
2 Method summary
Sample after 950 ℃ burning, burning is calculated by the difference between before and after the mass loss on ignition.
3 instruments and equipment
3.1 Analytical balance. dividing the value of 0.0001g.
3.2 high-temperature furnace. temperature > 1000 ℃.
4 Sample
After grinding the sample in an oven at 105 ℃ ~ 110 ℃ baking 1h, cooled to room temperature and placed in a desiccator and immediately weighed.
Step 5 Analysis
5.1 Sample
Weigh 1.50g ~ 2.00g sample (see Chapter 4), accurate to 0.0001g.
5.2 Determination of the number of
Independently measured twice and averaged.
5.3 Determination
5.3.1 The sample (see 5.1) have been placed at 950 ℃ till constant weight porcelain crucible or platinum crucible at 950 ℃ burning 1h. Remove, slightly
Cooled, placed in a desiccator to cool to room temperature, and weighed.
Repeat operations 5.3.2 5.3.1 until constant mass porcelain crucible and burning objects.
6 Calculation and presentation of analysis results
According to equation (1) calculate the loss on ignition of mass fraction, expressed in%.
w =
m0 m2-m1
m0 ×
100% (1)
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