PDF GB/T 16479-2020 English (GB/T 16479-2008: Older version)
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Light rare earth carbonate
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Light rare earth carbonate
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| GB/T 16479-1996 | English | 199 |
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Rare earth carbonate
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GB/T 16479-2020: PDF in English (GBT 16479-2020) GB/T 16479-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.120.99
H 65
Replacing GB/T 16479-2008
Light rare earth carbonate
碳酸轻稀土
ISSUED ON: NOVEMBER 19, 2020
IMPLEMENTED ON: OCTOBER 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Technical requirements ... 5
4 Test methods ... 7
5 Inspection rules ... 7
6 Marks, packaging, transport, storage and quality certificate ... 8
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 16479-2008 “Light rare earth carbonate”.
Compared with GB/T 16479-2008, in addition to editorial modifications, the
main technical changes are as follows:
- modified text description of the scope (see Clause 1 of this Edition);
- modified normative references (see Clause 2 of this Edition);
- added product classification (see 3.1 of this Edition);
- added character designations (see 3.1, 3.2 of this Edition);
- added content requirements for lanthanum oxide (La2O3) in all product
designations (see 3.2 of this Edition);
- added radioactivity requirements for product designations (LaCe)x(CO3)y-
65Ce, (LaCePr)x(CO3)y-58Ce (see 3.2 of this Edition);
- added content requirements for praseodymium oxide (Pr6O11), neodymium
oxide (Nd2O3), manganese oxide (MnO2), sodium oxide (Na2O), and lead
oxide (PbO) of product designation (LaCe)x(CO3)y-65Ce (see 3.2 of this
Edition);
- modified some content requirements for product designation
(LaCe)x(CO3)y-65Ce; modified the total rare earth (REO) content from not
less than 44% to not less than 45%, cerium oxide (CeO2) content from not
less than 62% to 62%~68%, sulfate (SO42-) content from not more than
0.05% to not more than 0.03%, chloride (Cl-) content from not more than
0.2% to not more than 0.15%, calcium oxide (CaO) content from not more
than 0.5% to not more than 0.05%, magnesium oxide (MgO) content from
not more than 0.1% to not more than 0.01% (see 3.2 of this Edition, 3.1 of
Edition 2008);
- added content requirements for neodymium oxide (Nd2O3), sodium oxide
(Na2O) and lead oxide (PbO) of product designation (LaCePr)x(CO3)y-58Ce
(see 3.2 of this Edition);
- modified some content requirements for product designation
(LaCePr)x(CO3)y-58Ce; modified the total rare earth (REO) content from not
less than 44% to not less than 45%, praseodymium oxide (Pr6O11) content
from not less than 4% to 4%~7%, content of other rare earth impurities from
the margin to not more than 0.3%, calcium oxide (CaO) content from not
more than 0.5% to not more than 0.2%, alumina (Al2O3) content from not
Light rare earth carbonate
1 Scope
This Standard specifies technical requirements, test methods, inspection rules,
marks, packaging, transport, storage and quality certificates for light rare earth
carbonate.
This Standard is applicable to light rare earth carbonate prepared by chemical
method with bastnaesite-monazite mixed concentrate as raw material. It is
mainly used to separate single rare earths, prepare rare earth polishing
materials, catalytic materials, and mixed rare earth metals.
2 Normative references
The following referenced documents are indispensable for the application 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 8170, Rules of rounding off for numerical values & expression and
judgement of limiting values
GB/T 12690 (all parts), Chemical analysis methods of non-rare earth
impurities in rare earth metals and the oxides
GB/T 16484 (all parts), Chemical analysis methods of rare earth chloride and
light rare earth carbonate
GB/T 17803, Designation system for rare earth products
3 Technical requirements
3.1 Product classification
The products are divided into three designations: (LaCe)x(CO3)y-65Ce,
(LaCePr)x(CO3)y-58Ce, (LaCePrNdEu)x(CO3)y-0.2Eu, according to chemical
composition. The representation methods for product designation shall meet
the requirements of GB/T 17803.
3.2 Chemical composition
The chemical composition of the product shall meet the requirements of Table
4 Test methods
4.1 Chemical composition
4.1.1 The analysis methods for the total content of rare earths, the proportion
of rare earths (La2O3, CeO2, Pr6O11, Nd2O3, Eu2O3), other rare earth impurities,
non-rare earth impurities (Fe2O3, SO42-, Cl-, CaO, MgO, ZnO, MnO2, Na2O, PbO)
and acid-insoluble substances are carried out according to the provisions of the
corresponding part of GB/T 16484.
4.1.2 The analysis methods for fluorine content (F-) and alumina (Al2O3) are
carried out in accordance with the provisions of the corresponding part of GB/T
12690.
4.1.3 The analysis method of radioactivity is carried out according to the
supplier’s current method.
4.2 Numerical rounding
Numerical rounding is carried out in accordance with the provisions of GB/T
8170.
4.3 Appearance quality
Under natural scattered light, conduct visual inspection.
5 Inspection rules
5.1 Inspection and acceptance
5.1.1 The product is inspected by the supplier’s technical supervision
department to ensure that the quality of the product meets the requirements of
this standard and fill in the quality certificate.
5.1.2 The purchaser shall inspect the products received. If the inspection result
does not conform to the provisions of this Standard, it shall be submitted to the
supplier within 2 months from the date of receipt of the product. It shall be
solved by supplier and purchaser via negotiation. If arbitration is required, it can
be carried out by an organization recognized by both parties. Jointly conduct
sampling at purchaser’s.
5.2 Batching
Products shall be submitted for inspection in batches. Each batch shall be
composed of products of the same designation.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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