GB/T 14635-2020
Rare earth metals and their compounds—Determination of total rare earth content (English Version)

Standard No.

GB/T 14635-2020

Language

Chinese, Available in English version

Release Date

2020

Published By

国家市场监督管理总局、中国国家标准化管理委员会

Latest

GB/T 14635-2020

Replace

GB/T 14635-2008

Scope

Determination and analysis method of total amount of rare earth This standard specifies the determination method of total amount of rare earth in rare earth metals and their compounds. This standard applies to the total amount of rare earth metals and their compounds, method 2 EDTA titration. Method 1 is applicable to the determination of the total amount of rare earths in single and mixed rare earth metals and their compounds, and the determination range is shown in Table 1; it is not applicable to the determination of the total amount of rare earths in the main body or needles and substances. Method 2; Determination of the total amount of rare earths in its compounds, the determination of single and mixed rare earth metals with a content greater than 0.1% is applicable to the range of single rare earth metals and mixed rare earth metals mainly composed of heavy rare earth titanium, Zou, Langjing, and Yin See Table 2; it is not applicable to the determination of the relative purity of a single rare earth less than 99.5% and the amount of other impurities specified in GB/T14635-2020. This standard contains two methods: Method 1 Determination of the total amount of rare earth in a single rare earth metal and its compound with an oxalate heavy rare earth metal and its compound element content greater than 0.5 mm; Determination of the total amount of rare earths in the materials shown in Table 1. Method 1 Determination range, Determination range Sample history Rare earth metal 95.0-99.5 Rare earth oxide 95.0-99.5 Rare earth oxalate 95.0-99.8 Dilute ammonia oxide 25.0-90.0 Rare earth fluoride 65.0-65.0 90.0 rare earth oxide 40.0-70.0 rare earth carbonate 10.0-70.0 rare earth nitrate 30.0-70.0 rare earth sulfide 55.0-90.0 ionic rare earth ore mixed rare earth oxide 80.0-99.0 Oxide 95.0-99.5 Rare earth oxalate 95.0-99.5 Ammonium oxide rare earth 25.0-90.0 GB/T14635-2020 Table 2 (continued) Measuring range Rare earth fluoride 65.0-90.0 Rare earth oxide 40.0-70.0 Rare earth sulfide 55.0-90.0 2 Method 1: Grass salt gravimetric method

GB/T 14635-2020 history

• 2020 GB/T 14635-2020 Rare earth metals and their compounds—Determination of total rare earth content
• 2008 GB/T 14635-2008 Rare earth metals and their compounds.Determination of total rare earth contents
• 2002 GB/T 18882.1-2002 Chemical analysis methods for mixed rare earth oxide of ion-absorpted type RE ore-Determination of total rare earth contents-Oxalate gravimetric method
• 1996 GB/T 16484.19-1996 Methods for chemical analysis of rare earth chloride and carbonate--Determination of total rare earth oxide content
• 1993 GB/T 14635.3-1993 Heavy rare earth metals and their compounds. Determination of total rare earth contents. EDTA volumetric method
• 1990 GB/T 12687.1-1990 Chemical analysis of nitrate of rare earth for agriculture--Determination of total rare earth oxide content--Gravimetric method
• 1988 GB/T 8762.1-1988 Yttrium oxide and europium oxide of phosphor grade--Determination of total rare earth oxide content--EDTA volumetric method