GB/T 2969-2020Samarium 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 2969-2008 "Samarium Oxide". Compared with GB/T 2969-2008, the main technical changes except for editorial changes Change as follows.

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

---Modified the assessment index of the rare earth impurity praseodymium and total amount in the grade Sm2O3-4N, and adjusted the non-rare earth impurities Fe2O3 and SiO2 The evaluation indicators (see 3.2, 3.1 of the 2008 edition);

---Added the grade Sm2O3-3N5 (see 3.2);

---Modified some non-rare earth impurities of the grades Sm2O3-2N5 and Sm2O3-2N (see 3.2, 3.1 in the 2008 edition);

---Added the assessment index and calculation method of the main rare earth element Sm2O3 (see 3.2);

--- Modified rare earth impurities, 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);

---Modified the analysis method of the total content of rare earths (REO), and added that when the total amount of rare earths measured is more than 99%, the rare earths are calculated by the subtraction method.

The actual value of the total amount of soil (see 4.1.1, 4.1 in the 2008 edition);

---The calculation method of the relative purity of the main rare earth elements (Sm2O3/REO) has been increased, that is, the amount of the main rare earth elements/the total rare earth elements × 100% (see 4.1.5);

--- Added the requirement that when the appearance inspection result does not conform to this standard, the batch of products is directly judged as non-conforming product (see 5.5.2).

1 Scope

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

This standard applies to samarium oxide prepared by extraction or other methods for the production of metal samarium, magnetic materials, electronic components, 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 18115.5 Methods for chemical analysis of rare earth impurities in rare earth metals and their oxides. Lanthanum, cerium, praseodymium, neodymium, europium, gadolinium, terbium, samarium Determination of the amount of dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium

3 Technical requirements