The processes to produce non-ferrous metals are as varied and complex as the equipment required for the purpose. For new linings, repair, and servicing of short rotary furnaces, Refratechnik Steel offers high-fired magnesia chromite products with low porosity and low SiO2 contents.

1. Lining concepts for the lead industry
Short rotary furnaces.

2. Intelligent lining concepts
for the lead industry
MACHROMEX®: Magnesia chromite bricks from Refratechnik,
direct bonded, dense-pressed, ultra high-fired
For new linings, repair, and servicing of short
rotary furnaces, Refratechnik Steel offers
high-fired magnesia chromite products with
low porosity and low SiO2 contents.
Our products meet the highest demands on
corrosion resistance as well as thermochemical
stresses, thereby ensuring long service lives
and high furnace availability.
Our service team is happy to consult you about
the right selection and the correct installation
of the corresponding materials. Together, we
develop customized solutions that meet your
requirements precisely.
Let's talk about your goals.
We'll find the right way.
As a supplier of high-grade refractory ma-
terials, Refratechnik Steel GmbH is a global
partner for the steel, non-ferrous metals, and
chemical industries. Whether shaped or un-
shaped products or process materials – backed
by 70 years of experience, we offer individual
refractory solutions for every customer.
The processes to produce non-ferrous metals
are as varied and complex as the equipment
required for the purpose.
For example, the refractory linings of furnaces
used in the lead recycling industry are
particularly exposed to attack by acidic slags,
and also to infiltration by overheated melts at
temperatures above 1000 °C. In addition, they
are subjected to mechanical wear mechanisms
due to scrap charging and the rotation of the
furnace.
2©Refratechnik Steel GmbH

3. Short rotary furnaces
Short rotary furnaces are a central part for the
lead recycling industry, and therefore the most
important furnace type for recycling operations.
Temperatures above 1000 °C, the low viscosity
of molten lead, the contact with acidic slags
plus the addition of alkalis, and the presence
of sulfur during the recycling process promote
high wear of the refractory lining.
With their low porosity, minimum SiO2 content,
and high wear resistance, Refratechnik Steel's
magnesia chromite-based products counteract
these mechanisms.
Taphole
REFRASPECIAL® CR-25
REFRAMIX® CBP M-51 CR-22
Wear lining of head wall
MACHROMEX® 60 S
Backfilling material
REFRACAST® F-42
Insulation
REFRAL® 40
REFRATHERM® 1200/390
MACHROMEX® 60 S
Wear lining of cylinder
MACHROMEX® 60 S
MACHROMEX® 60 D
3©Refratechnik Steel GmbH

4. Technical properties
Shaped products
Unshaped products
Special formats as well as salt impregnation of the bricks for infiltration and hydration protection are possible on request.
Also available on request are single bricks with customized tolerances.
Quality Chemical analysis Bulk density
g/cm³
Open
porosity
Vol.-%
Cold
crushing
strength
N/mm²
Refractoriness
under load
°C
MgO
%
Al2O3
%
SiO2
%
Cr2O3
%
Fe2O3
%
MACHROMEX® 60 D > 58 < 6 < 2.0 > 19 < 12 > 3.25 < 16.5 > 45.0 > 1650
Sintered magnesia, chrome ore
MACHROMEX® 60 S > 58 < 5 < 1.5 > 19 < 10 > 3.33 < 16.0 > 60.0 > 1700
Electrofused magnesia, electrofused magnesia-chrome
REFRAL® 40 40 55.0 2 2.20 17 35.0 1350
Fireclay
Quality Chemical analysis Application
temperature
max. °C
Material
required
t/m³
Cold
crushing
strength
1000 °C
N/mm²
Al2O3
%
SiO2
%
Fe2O3
%
CaO
%
MgO
%
Cr2O3
%
REFRASPECIAL® CR-25 > 34.0 < 7.5 < 16.00 < 8.5 > 8.0 > 23.0 1550 3.00 35.0
Chrome ore
REFRAMIX® CBP M-51 CR-22 6.50 5.00 10.50 1.50 55.5 21.0 1750 3.00 25.0
Magnesia, chrome ore
REFRACAST® F-42 > 38.0 < 47.0 < 5.00 < 7.5 1350 2.05 12.0
Fireclay
MX-R-Mörtel < 5.0 ≤ 2 65 – 70 14 – 17 1700 2.10
Magnesia, chrome magnesia
REFRABOND® F-40 > 40.0 < 55.0 < 1.60 1450 1.50
Fireclay
4©Refratechnik Steel GmbH

5. Let's talk about your goals.
We'll find the right way.
Refratechnik Steel GmbH is part
of the Refratechnik Group, the
largest family-owned and globally
operating group of companies in
the refractory industry.
Within this Group, we are one of
the world's Top 10 manufacturers
of refractory products.
Headquartered in Düsseldorf,
­Refratechnik Steel specializes in
refractory products and concepts
for worldwide applications in the
steel, NF metals, environmental,
and energy industries.
With a comprehensive and always
innovative portfolio of products and
services, Refratechnik Steel takes
second place in the Group's overall
performance rating.
The Refratechnik Group is certified according to
ISO 9001 – Quality management system, and
ISO 14001 – Environmental management system.
1900 employees
50 nationalities
27 locations
3000 customers
150 agencies
120 import countries
500 000 t production capacity
12 production sites
5 research facilities
5©Refratechnik Steel GmbH
1900 employees
50 nationalities
27 locations
3000 customers
150 agencies
120 import countries
500 000 t production capacity
12 production sites
5 research facilities

6. Refratechnik Steel GmbH
Am Seestern 5
40547 Düsseldorf
Germany
Phone +49 211 5858 0
Fax +49 211 5858 49
nonferrous@refra.com
www.refra.com
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