Research on determination of the rare-earth content in metal phases of steel |
| |
Authors: | Fang Keming Ni Ruiming |
| |
Affiliation: | (1) Beijing University of Iron and Steel Technology, Beijing, China |
| |
Abstract: | The behavior of the rare-earth dissolved in a-Fe, of the iron-cerium intermetallic compounds and of the rare-earth inclusions
in electrolytic separation process has been studied by means of counting measurements of radioactivity, the electron probe,
and X-ray analysis. The experimental results show that the rare-earth sulfide and the rare-earth oxide are stable completely
in the electrolytic separation process, when the composition of the electrolytic solution is 1 pct 4-methyl ammonium chloride,
5 pct triethanolamine, 5 pct glycerin, and 89 pct methyl alcohol, and the controlling anode current density is ≤100 mA/cm2. But Fe-Ce intermetallic compounds and the rare-earth dissolved in a-Fe enter into electrolytic solution as ions. When the
cerium ion concentration in electrolytic solution is >7.87 X 10-5 mol/liter electrolyte, precipitates of cerium hydroxide will be formed. When the inclusions are separated quantitatively,
the electrolytic solution must be filtered by using a funnel with filter paper pulp thick up to 6 mm, and not be filtered
directly with single filter paper. Samples without rare-earth were remelted and a radioactive isotope141Ce was added to the steel. Inclusions were separated by the electrolytic method in the nonaqueous solution. The counting of
14lCe in the electrolytic solution was measured. Thus the rare-earth content in the metal phases can be calculated. Experimental
results show that the rare-earth content in the metal phases increases with the total rare-earth content in steel. The rare-earth
content in the metal phases of the steel was also found to increase as the aluminum content in steel was increased. This method
for determining the rare-earth content in the metal phases of steel is very sensitive. The sensitivity is 10-6 pct. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|