The use of reactive MgO has become established as an excellent solution for minimizing the attack on the refractory material by aggressive slags, and to obtain an optimum degree of saturation range in the slag. For this purpose, and as specialists for refractory products and process materials, Refratechnik has developed the special product REPROMAT.

1. REFRATECHNIK
REPROMAT
The perfect slag conditioner
for steel production
Ihr Ziel ist unser Antrieb.
Results first.

2. REPROMAT: Slag conditioning and protection
of the basic refractory lining
The use of reactive MgO has
become established as an
excellent solution for minimiz-
ing the attack on the refractory
­material by aggressive slags, and
to obtain an optimum degree of
saturation range in the slag.
For this purpose, and as special-
ists for refractory products and
process materials, Refratechnik
has developed the special product
REPROMAT.
The use of REPROMAT has the
­following advantages:
• High reactivity and correspond-
ingly fast dissolution of the MgO
in the slag
• Fast achievement of the optimum
degree of saturation
• Minimized wear of the
­MACARBON® refractory ­lining
through a reduction of the
­corrosion potential
• Optimized energy balance when
used in electric arc furnaces and
ladle furnaces through improved
formation of foamed slag
• Simplified slag coating of the
refractory lining when used in
converters
• No storage problems
• Conveying and batching is
­possible with existing material
handling system
REPROMAT – Pellets made of
reactive magnesia for conditioning
the slag with MgO
©Refratechnik Casting GmbH

3. Wear mechanisms
in the refractory material
%MgO
17
16
15
14
13
12
11
10
9
8
7
6
5
1
Depending on basicity, an
MgO content of more than 9%
is required for slag saturation.
1.5 2 2.5 3 3.5
% CaO / SiO2
Saturation of slag with MgO Data sheet REPROMAT 80
Refractory material wear is
­determined by a combination
of the following mechanisms:
• Abrasion and erosion
• Thermomechanical wear
• Corrosion and oxidation
Hereby, the slag's basicity is
one of the main parameters for
the ­corrosive behaviour of the
­refractory material. Lower slag
basicity requires a higher MgO
­content to saturate the slag.
The addition of REPROMAT enables
an optimum slag saturation to be
obtained, while simultaneously
preventing the dissolution of MgO
from the basic refractory lining
material. Especially with acid slags,
a decisive reduction of lining wear
is now possible.
Physical properties
Density 1100 kg/m³
Grain size 10-40 mm
Melt temperature 1700 °C
Chemical composition % by weight
MgO 80
CaO 8.0
SiO2 9.0
Al2O3 1.0
Fe2O3 1.0
PC 25
Moisture 2
Spalling and
thermomechanical wear
Abrasion
and erosion
Crushing, destruction, stripping
Changedcomposition,melt
Infiltration,changedvolume
Corrosion and oxidation
©Refratechnik Casting GmbH

4. Ca1-007-7/2012
Refratechnik Casting GmbH
Schiessstrasse 58
40549 Düsseldorf
Germany
Phone +49 211 5858 0
Fax +49 211 5858 149
casting@refra.com
www. refra.com
Ca1-007-7/2012