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GB/T 18114.7-2010: Chemical analysis methods of rare earth concentrates -- Part 7: Determination of iron oxide content -- Potassium dichromate titration
Status: Valid GB/T 18114.7: Evolution and historical versions
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| GB/T 18114.7-2010 | English | 139 |
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Chemical analysis methods of rare earth concentrates -- Part 7: Determination of iron oxide content -- Potassium dichromate titration
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GB/T 18114.7-2010
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| GB/T 18114.7-2000 | English | 199 |
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Methode for chemical analysis of monazite concentrates. Determination of iron oxide content
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GB/T 18114.7-2000
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Basic data | Standard ID | GB/T 18114.7-2010 (GB/T18114.7-2010) | | Description (Translated English) | Chemical analysis methods of rare earth concentrates -- Part 7: Determination of iron oxide content -- Potassium dichromate titration | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H14 | | Classification of International Standard | 77.120.99 | | Word Count Estimation | 6,642 | | Date of Issue | 1/14/2011 | | Date of Implementation | 11/1/2011 | | Older Standard (superseded by this standard) | GB/T 18114.7-2000 | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 2 of 2011 | | Issuing agency(ies) |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 Determination of iron oxide content of rare earth concentrates. This Standard is applicable to the determination of iron oxide content of rare earth concentrates, the measurement range of 0. 50% to 10. 0%. | GB/T 18114.7-2010: Chemical analysis methods of rare earth concentrates -- Part 7: Determination of iron oxide content -- Potassium dichromate titration
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Chemical analysis methods of rare earth concentrates Part 7. Determination of iron oxide content Potassium dichromate titration
ICS 77.120.99
H14
National Standards of People's Republic of China
Replacing GB/T 18114.7-2000
Methods for chemical analysis of rare earth concentrates
Part 7. Determination of iron oxide content
Dichromate method
Part 7. Determinationofironoxidecontent-
Issued on. 2011-11-01 2011-01-14 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
GB/T 18114 "Methods for chemical analysis of rare earth concentrates" is divided into 11 parts.
--- Part 1. Determination of total rare earth oxide gravimetric method;
--- Part 2. Determination of thorium oxide content;
--- Part 3. Determination of calcium oxide content;
--- Part 4. niobium oxide, zirconium oxide, titanium oxide content - Inductively coupled plasma atomic emission spectrometry;
--- Part 5. aluminum oxide content - Inductively coupled plasma atomic emission spectrometry;
--- Part 6. Determination of the amount of silica;
--- Part 7. Determination of the amount of iron oxide dichromate method;
--- Part 8. fifteen rare earth element oxide with components measured by inductively coupled plasma atomic emission spectrometry;
--- Part 9. Determination of the amount of phosphorus pentoxide bismuth molybdenum blue spectrophotometric method;
--- Part 10. Determination of moisture content - Gravimetric method;
--- Part 11. Determination of the amount of fluorine EDTA titration.
This is Part 7.
This part is GB/T 18114.7-2000 "Methods for chemical analysis of monazite concentrates - Determination of iron oxide content," the amendment.
This section compared with the GB/T 18114.7-2000, have the following main changes.
--- Measured by the range of 0.50% to 5.00 percent to 0.50% to 10.0%;
--- Sample was adjusted to the melting time from 40min 25min;
--- The filtrate was adjusted with hydrochloric acid to dissolve the alkali separated directly after the funnel was filtered off and the filter paper together into the original beaker, add
The precipitate was dissolved into boiling hydrochloric acid, filtered while hot;
--- Made with tin dichloride is used as a reducing agent to adjust tin dichloride - titanium trichloride as reducing agent;
--- Increasing the precision of the terms;
--- Increased quality assurance and control provisions.
This part of the National Standardization Technical Committee of rare earth (SAC/TC229) centralized.
This section is Baotou Rare Earth Research Institute, China Nonferrous Metals Industry Institute of Standards Metrology and Quality is responsible for drafting.
This section was drafted by the Beijing Nonferrous Metal Research Institute.
This part of Guangdong Zhujiang Rare Earth Co., Ltd., Ganzhou Qiandong Rare Earth Group Co., Ltd. participated in the drafting.
The main drafters of this section. Liu Pengyu, Bing.
The drafters of some of the participants. Liang Zhijie, Denghan Qin Yao Hung Nan, Chen Jie, Zhu Ni, REID sea.
This part of the standard replaces the previous editions are.
--- GB/T 18114.7-2000.
Methods for chemical analysis of rare earth concentrates
Part 7. Determination of iron oxide content
Dichromate method
1 Scope
GB/T 18114 provisions of this part of the determination of iron oxide content of rare earth concentrates.
This section applies to the determination of rare earth concentrates of iron oxide content, a measurement range of 0.50% to 10.0%.
2 principle of the method
After the sample by alkali melting, flooding, filtered to remove most of the coexisting elements; the filtrate was acidified with hydrochloric acid, the first with a large amount of iron tin dichloride
(Ⅲ) reduction of iron (Ⅱ), and then sodium tungstate as an indicator, with titanium trichloride remaining Fe (Ⅲ) reduction, further reduction of tungstate to generate
Tungsten blue, then a solution of potassium dichromate to the disappearance of the blue. Sulfuric acid mixed media, diphenylamine sulfonate as indicator with dichromate.
3 Reagents and materials
3.1 sodium hydroxide.
3.2 sodium peroxide.
3.3 potassium dichromate (reference).
3.4 titanium trichloride 150g/L ~ 200g/L (or commercially available).
3.5 hydrochloride (11).
3.6 NaOH wash (10g/L).
3.7 HCl wash (298).
3.8 tin dichloride solution. Weigh 5g tin dichloride, was added 10mL of hydrochloric acid (3.5), heated to dissolve, dilute to 100mL. The time is now equipped with.
3.9 sodium tungstate solution (250g/L).
3.10 titanium trichloride solution (2080), the time is now equipped with.
3.11 sulfuric acid, phosphoric acid mixed solution. constant stirring, 150mL to 700mL of water was slowly added sulfuric acid (ρ1.84g/mL) and
150mL phosphate (ρ1.69g/mL).
3.12 ferrous ammonium sulfate solution (approximately 0.1mol/L).
3.13 potassium dichromate standard titration solution. Weigh 0.4390g by 150 ℃ drying 1h baseline potassium dichromate (3.3) in the 100mL beaker
The amount of water was added to dissolve the clear, transferred to 1000mL volumetric flask, dilute with water to volume, and mix. This solution of iron titration factor
(F) is 0.5000g/L.
3.14 diphenylamine sulfonate solution (5g/L).
4 Sample
The sample size should be 4.1 to grind through the 0.074mm sieve.
4.2 The sample was 105 ℃ ~ 110 ℃ drying 2h, placed in a desiccator, cooled to room temperature.
Step 5 Analysis
5.1 Sample
Table 1. Weigh the sample (4), accurate to 0.0001g.
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