T/GZHG 032-2022 Active Group standards

T/GZHG 032-2022 Determination of rare earth content in phosphorus ore

Publish Date: 2022-06-15 Implement Date: 2022-07-15 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/GZHG 032-2022

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: -

ICS Name: Chemical production

Publish Date: 2022-06-15

Implement Date: 2022-07-15

Scope

Main Technical Content: 3. Principle: After the hydrolysis of the test sample with sodium hydroxide and sodium peroxide, the rare earth elements form hydroxide precipitates when extracted with water. Triethanolamine is added to complex iron and aluminum in the solution, and EGTA is added to complex calcium and barium. The precipitates are washed with sodium hydroxide solution and water. The precipitates are dissolved in concentrated nitric acid, cooled, and then measured using an inductively coupled plasma emission spectrometer or an inductively coupled plasma mass spectrometer to determine the content of 16 rare earth elements. 4. Reagents and Materials: Unless otherwise specified, all reagents used in the analysis are of analytical grade and meet the requirements of GB/T 6682 for first-level analytical laboratories. 4.1 Sodium hydroxide: Analytical grade. 4.2 Sodium peroxide: Analytical grade. 4.3 Nitric acid: Ultra-high purity. 4.4 Sodium hydroxide: Analytical grade. 4.5 Triethanolamine: Analytical grade. 4.6 Ethylene glycol dimethyl ether diamine tetraacetic acid (EGTA): Analytical grade. 4.7 Sodium hydroxide solution (10 g/L): Accurately weigh 1 g of sodium hydroxide (4.4) and dissolve it in 100 mL of water. 4.8 Sodium hydroxide solution (100 g/L): Accurately weigh 10 g of sodium hydroxide (4.4) and dissolve it in 100 mL of water. 4.9 Triethanolamine solution (5%): Accurately pipette 5 mL of triethanolamine (4.5) and dilute it to 100 mL with water. 4.10 EGTA solution (0.1 mol/L): Weigh 3.8 g of EGTA (4.6) into a 100 mL beaker, add 50 mL of water, heat at low temperature, and stir while adding sodium hydroxide solution (4.8) until it just dissolves. Cool to room temperature and add water to approximately 100 mL. 4.11 Rare earth standard reserve solution: A commercially available certified standard solution containing 16 rare earth elements (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y, Sc) with a concentration of 100μg/mL.