GB/T 2526-2020Gadolinium oxide (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 2526-2008 "Gadolinium Oxide". Compared with GB/T 2526-2008, the main technical changes except for editorial changes Change as follows.

---Added character designation (see 3.1 and 3.2);

---Added grades with a purity not less than Gd2O3-5N5 and grades with a purity not less than Gd2O3-2N5 (see 3.2);

---Modified the non-rare earth impurities and non-rare earth impurities iron (Fe2O3), calcium (CaO) and other assessment indicators in the grade Gd2O3-3N5 (see 3.2, 3.1 of the 2008 edition);

---Modified the assessment indicators of non-rare earth impurities iron (Fe2O3), silicon (SiO2), calcium (CaO), etc. in the grade Gd2O3-3N (see 3.2, 3.1 of the 2008 edition);

---Modified the assessment indicators of non-rare earth impurity calcium (CaO) in the grade Gd2O3-4N (see 3.2, 3.1 in the 2008 edition);

---Modified the assessment indicators of non-rare earth impurities silicon (SiO2), nickel (NiO) and aluminum (Al2O3) in the grade Gd2O3-5N (see 3.2, 3.1 of the 2008 edition);

---Added the assessment index and calculation method of the main rare earth element gadolinium (Gd2O3) (see 3.2);

--- Modified the expression of rare earth impurities and deleted the denominator REO (see 3.2, 3.1 in the 2008 edition);

---The burning loss index is modified as the combined amount index of moisture and burning loss (see 3.2, 3.1 in the 2008 edition);

---Added the note that all tests are the state before burning after removing water (see 3.2);

---Revised the analysis method of the total content of rare earth (REO) (see 4.1.1, 4.1 in the 2008 edition);

---The calculation method of the relative purity of the main rare earth elements (Gd2O3/REO) has been added (see 4.1.4);

---Added the requirements for determining the appearance inspection results (see 5.5.2).

1 Scope

This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation, storage and quality certificates of gadolinium oxide.

This standard applies to gadolinium oxide produced by extraction or other methods for the production of fluorescent materials, optical glass, metal gadolinium, etc.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document.

GB/T 8170 Numerical rounding rules and the expression and determination of limit values

GB/T 12690 (all parts) Chemical analysis methods for non-rare earth impurities in rare earth metals and their oxides

GB/T 14635 Methods for chemical analysis of rare earth metals and their compounds Determination of total rare earth

GB/T 17803 Rare earth product designation method

GB/T 18115.7 Methods for chemical analysis of rare earth impurities in rare earth metals and their oxides, lanthanum, cerium, praseodymium, neodymium, samarium, europium, terbium, gadolinium Determination of the amount of dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium

3 Technical requirements