REFRACTORIES IN HEATING UNITS
EFFECT OF REFINING SLAG PHASE COMPOSITION
ON LADLE FURNACE UNIT LINING LIFE
O. Yu. Sheshukov,
I. V. Nekrasov,
M. A. Mikheenkov,
D. K. Egiazar’yan,
L. A. Ovchinnikova,
I. D. Kashcheev,
K. G. Zemlyanoi,
and V. A. Kamenskikh
Translated from Novye Ogneupory, No.3, pp. 95 – 102, March, 2016.
Original article submitted March 19, 2015.
The working layer of a ladle furnace unit (LFU) lining made from periclase-graphite refractory is most
strongly subjected to the effect of corrosion factors that concern thermal, mechanical, and chemical action.
The strongest destructive effect on a lining is the chemical factor. This article provides results of studying the
effect slag phase composition on chemical breakdown of a LFU periclase-graphite lining.
Keywords: ladle furnace unit (LFU), periclase-graphite refractory, secondary aluminum production waste
(SAPW), slag, belite.
According to data in [1, 2] a ladle furnace unit (LFU) re-
fining slag should provide removal of sulfur from steel,
deoxidation, steel cleaning from nonmetallic inclusions, the
required finished steel chemical composition, protection of
steel from action of the atmosphere, and metal surface heat
insulation. Experience of operating LFU has shown that from
the slag properties indicated providing preparation of high
quality steel, LFU refining slag should not have a destructive
effect on the LFU lining; a stable structure not inclined to
wards self-decomposition; possibility of exhibiting mineral
binder substance or broken slag properties. Among factors
affecting the destructive action on an LFU lining it is possi
ble to separate mechanical, thermal, and chemical action.
Slag chemical action on a lining is the most significant
among those noted.
The degree of chemical action of slag on an LFU lining
depends on the type of steel grade being melted, determining
refining slag composition. A range of chemical composition
for LFU refining slags is shown in Fig. 1  corresponding
to smelted steel grades. Fields of refining slag chemical com-
position correspond to the following steel grades: 1) refining
slags for preparing ultrapure steels with a low Al content,
Refractories and Industrial Ceramics Vol. 57, No. 2, July, 2016
1083-4877/16/05702-0109 © 2016 Springer Science+Business Media New York
Proceedings of the International Conference of Refractory
Workers and Metallurgists (19 – 20 March, 2015, Moscow).
FGBUN Institute of Metallurgy, Ural Section, Russian Academy
of Sciences, Ekaterinburg, Russia.
FGAOU VPO Ural Federal University, Ekaterinburg, Russia.
Fig. 1. Fields of chemical composition of LFU refining slags corre
sponding to smelted steel grades.