XB/T 617.5-2014Chemical analysis methods for neodymium iron boron alloy - Part 5: Determination of zirconium, niobium, molybdenum, tungsten and titanium contents - Inductively coupled plasma atomic emission spectrometry (English PDF)

Foreword

This document was issued on 14 October 2014 by the Ministry of Industry and Information Technology of the People's Republic of China, and has applied since 1 April 2015.

It is an XB/T standard: a recommended industry standard of China's rare earth industry.

XB/T 617, Chemical analysis methods for neodymium iron boron alloy, consists of seven parts: Part 1, determination of total rare earth content; Part 2, determination of fifteen rare earth elements; Part 3, determination of boron, aluminium, copper, cobalt, magnesium, silicon, calcium, vanadium, chromium, manganese, nickel, zinc and gallium contents by inductively coupled plasma atomic emission spectrometry; Part 4, determination of iron content by potassium dichromate titration; Part 5, determination of zirconium, niobium, molybdenum, tungsten and titanium contents by inductively coupled plasma atomic emission spectrometry; Part 6, determination of carbon content by high-frequency combustion infrared absorption; Part 7, determination of oxygen and nitrogen contents by pulse heating infrared absorption and thermal conductivity.

This part is Part 5 of XB/T 617.

This part is drafted in accordance with the rules given in GB/T 1.1-2009.

This part is under the jurisdiction of the National Technical Committee on Rare Earth of Standardization Administration of China (SAC/TC 229).

1 Scope

This part of XB/T 617 specifies the method for the determination of zirconium, niobium, molybdenum, tungsten and titanium contents in neodymium iron boron alloy.

This part is applicable to the determination of these elements in neodymium iron boron alloy. The determination range is 0.010 % to 0.50 %.

2 Principle

The sample is dissolved in nitric and sulfuric acids and the elements are measured with an inductively coupled plasma atomic emission spectrometer in dilute acid medium, the effect of the matrix on the measured elements being corrected by matrix matching.

3 Reagents and materials

3.1 Hydrofluoric acid (rho = 1.14 g/mL).

3.2 Nitric acid (1+1).

3.3 Hydrochloric acid (1+1).

3.4 Sulfuric acid (1+1).

3.5 Zirconium standard stock solution: weigh 1.0000 g of zirconium metal [w(Zr) >= 99.99 %] into a polytetrafluoroethylene beaker, add 5 mL of hydrofluoric acid (3.1) and dissolve with heat until clear; cool, transfer to a 1,000 mL volumetric flask, add 35 mL of hydrofluoric acid (3.1), dilute to the mark with water and mix. 1 mL of this solution contains 1 mg of zirconium. Store in a plastic bottle.

3.6 Niobium standard stock solution: prepared as in 3.5 from 1.0000 g of niobium metal [w(Nb) >= 99.99 %]. 1 mL of this solution contains 1 mg of niobium. Store in a plastic bottle.

3.7 Molybdenum standard stock solution: prepared as in 3.5 from 1.0000 g of molybdenum metal [w(Mo) >= 99.99 %]. 1 mL of this solution contains 1 mg of molybdenum. Store in a plastic bottle.

3.8 Tungsten standard stock solution: prepared as in 3.5 from 1.0000 g of tungsten metal [w(W) >= 99.99 %]. 1 mL of this solution contains 1 mg of tungsten. Store in a plastic bottle.

3.9 Titanium standard stock solution: prepared as in 3.5 from 1.0000 g of titanium metal [w(Ti) >= 99.99 %]. 1 mL of this solution contains 1 mg of titanium. Store in a plastic bottle.