GB/T 18882.1-2023Chemical analysis methods of mixed rare earth oxide of ion-absorption rare earth ore—Part 1:Determination of fifteen rare earth oxides composition (English PDF)

1 Scope

This document describes the method for determining the fifteen rare earth oxides composition in mixed rare earth oxides, carbonates, oxalates, and rare earth chloride feed solutions of ion-absorption rare earth ore.

This document applies to the determination of fifteen rare earth oxides composition in mixed rare earth oxides, carbonates, oxalates, and rare earth chloride feed solutions of ion-absorption rare earth ore. It contains two methods. Method 1.X-ray fluorescence spectrometry, whose measurement range is shown in Table 1. Method 2.Inductively coupled plasma emission spectrometry, whose measurement range is shown in Table 2.

When the measurement ranges of the two methods overlap, Method 1 is recommended as the arbitration method.

4 Method 1: X-ray fluorescence spectrometry

4.2.16 Lutetium oxide w (REO) >= 99.50%, w (Lu2O3/REO) > 99.99%, calcined at 950 °C for 1 h, cooled to room temperature.

4.2.17 Hydrochloric acid (rho = 1.19 g/mL).

4.2.18 Nitric acid (rho = 1.42 g/mL).

4.2.19 Hydrogen peroxide [w (H2O2) >= 30%].

4.2.20 Hydrochloric acid solution (1+1).

4.2.21 Hydrochloric acid solution (1+19).

4.2.23 Standard stock solution B. Weigh 0.100 0 g of praseodymium oxide (4.2.5) in a 100 mL beaker; use a small amount of water (4.2.1) to moisten; add 10 mL of hydrochloric acid solution (4.2.20); heat and dissolve until clear; cool and transfer to a 200 mL volumetric flask; use hydrochloric acid solution (4.2.21) to dilute to the mark; mix well. This solution contains 0.5 mg of praseodymium oxide in 1 mL.

4.2.24 Standard stock solution C~O. Weigh each single rare earth oxide according to […]

5 Method 2: Inductively coupled plasma optical emission spectroscopy

5.2.21 Lanthanum oxide standard stock solution. Weigh 0.500 0 g of lanthanum oxide (5.2.3) into a 100 mL beaker; use water (5.2.1) to moisten; add 5 mL of hydrochloric acid (5.2.17) and 1 mL of hydrogen peroxide (5.2.19); heat and decompose until clear; cool and transfer to a 100 mL volumetric flask; use water (5.2.1) to dilute to the mark; mix well.

5.2.23 Praseodymium oxide standard stock solution. Weigh 0.500 0 g of praseodymium oxide (5.2.5) into a 100 mL beaker; use water (5.2.1) to moisten; add 5 mL of hydrochloric acid (5.2.17) and 1 mL of hydrogen peroxide (5.2.19); heat and decompose until clear; cool and transfer to a 100 mL volumetric flask; use water (5.2.1) to dilute to the mark; mix well. This solution contains 5.00 mg of praseodymium oxide in 1 mL.

5.2.27 Gadolinium oxide standard stock solution. Weigh 0.500 0 g of gadolinium oxide (5.2.9) into a 100 mL beaker; use water (5.2.1) to moisten; add 5 mL of hydrochloric acid (5.2.17) and 1 mL of hydrogen peroxide (5.2.19); heat and decompose until clear; cool and transfer to a 100 mL volumetric flask; use water (5.2.1) to dilute to the mark; mix well. This solution contains 5.00 mg of gadolinium oxide in 1 mL.

5.2.28 Terbium oxide standard stock solution. Weigh 0.100 0 g of terbium oxide (5.2.10) into a 100 mL beaker; use water (5.2.1) to moisten; add 5 mL of hydrochloric acid (5.2.17) and 1 mL of hydrogen peroxide (5.2.19); heat and decompose until clear; cool and transfer to a 100 mL volumetric flask; use water (5.2.1) to dilute to the mark; mix well. This solution contains 1.00 mg of terbium oxide in 1 mL.

5.2.31 Erbium oxide standard stock solution. Weigh 0.500 0 g of erbium oxide (5.2.13) into a 100 mL beaker; use water (5.2.1) to moisten; add 5 mL of hydrochloric acid (5.2.17) and 1 mL of hydrogen peroxide (5.2.19); heat and decompose until clear; cool and transfer to a 100 mL volumetric flask; use water (5.2.1) to dilute to the mark; mix well. This solution contains 5.00 mg of erbium oxide in 1 mL.

5.2.32 Thulium oxide standard stock solution. Weigh 0.100 0 g of thulium oxide (5.2.14) into a 100 mL beaker; use water (5.2.1) to moisten; add 5 mL of hydrochloric acid (5.2.17) and 1 mL of hydrogen peroxide (5.2.19); heat and decompose until clear; cool and transfer to a 100 mL volumetric flask; use water (5.2.1) to dilute to the mark; mix well. This solution contains 1.00 mg of thulium oxide in 1 mL.

5.2.33 Ytterbium oxide standard stock solution. Weigh 0.500 0 g of ytterbium oxide (5.2.15) into a 100 mL beaker; use water (5.2.1) to moisten; add 5 mL of hydrochloric acid (5.2.17) and 1 mL of hydrogen peroxide (5.2.19); heat and decompose until clear; cool and transfer to a 100 mL volumetric flask; use water (5.2.1) to dilute to the mark; mix well. This solution contains 5.00 mg of ytterbium oxide in 1 mL.

5.2.34 Lutetium oxide standard stock solution. Weigh 0.100 0 g of lutetium oxide (5.2.16) into a 100 mL beaker; use water (5.2.1) to moisten; add 5 mL of hydrochloric acid (5.2.17) and 1 mL of hydrogen peroxide (5.2.19);

5.2.35 Standard stock solutions I ~ VIII. According to Table 11, weigh each single rare earth oxide (see 5.2.2 ~ 5.2.16) into a 200 mL beaker; use water (5.2.1) to moisten; add 10 mL of hydrochloric acid (5.2.17) and 1 mL of hydrogen peroxide (5.2.19); […]