Yields of rare earths in the process of smelting steels by magnesia crucible

DOI

10.2991/ifeesm-17.2018.131How to use a DOI?

Keywords

lanthanum; cerium; magnesia crucible; inclusion; liquid steel

Abstract

Two types of steels containing rare earths (RE) were smelted by the vacuum induction furnace with magnesia crucible, RE metals were added in liquid steel at the end of the smelting process, chemical compositions of the test steels were analyzed, and inclusions were observed by scanning electron microscope with energy dispersive spectrometer. The experimental results show that the yields of RE have no direct relationship with the oxygen and sulphur contents, but decrease with the increasing of RE addition amounts. The reaction between RE and MgO (the material of the crucible) is the major RE consumption mode, parts of the outer refractory are peeled off and become inclusions in the test steels. Because of the excessively active chemical properties, rare earths trend to react with refractory materials and metallurgical slag. Therefore, it is very difficult to utilize RE in the industrial production processes with con-casting, adding RE in the non-slag and non-refractory special processes may be feasible.

Copyright

© 2018, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Ya-Bo Li
AU  - Ji-Peng Zhao
AU  - Shao-Kang Liu
PY  - 2018/02
DA  - 2018/02
TI  - Yields of rare earths in the process of smelting steels by magnesia crucible
BT  - Proceedings of the 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017)
PB  - Atlantis Press
SP  - 699
EP  - 704
SN  - 2352-5401
UR  - https://doi.org/10.2991/ifeesm-17.2018.131
DO  - 10.2991/ifeesm-17.2018.131
ID  - Li2018/02
ER  -