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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Modern Refractories
for the Casting Lines
-
Materials and Application
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Overview of Materials
• Fused Silica – for precast shapes (launder segments,
filterboxes etc.)
• High Alumina Castable (for large shapes with long metal
contact times)
• Calcium Silicate – for machines parts (transitions plates,
launder dams etc)
• Insulation – how to improve performance and minimize heat
the heat loss of relined vessels
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Fused Silica
• Fused Silica is the most simply modification of Silicon
Dioxid ( SiO2), arise by a reaction between Silicon and
Oxygen.
• The result is a non crystalline, three-dimensional structure,
which has a high using temperature and a very low thermal
expansion.
• Fused Silica is melted in electric furnaces from quartz sand.
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Fused Silica
• Parts made out of Fused Silica could be used especially for
the production of aluminium billets, ingots and rolling slabs.
• Fused Silica in general is pre fired, ready to use. So no
additional treatment like drying or machining is necessary.
• An additional property for the usage in liquid aluminium is
the excellent non wetting character.
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Technical Data Fused Silica
• Max. application temperature: 1000 °C
• Chemical Analysis: approx. 85 % SiO2
approx. 10 % Al2O3
approx. 5 % CaO
traces Others
• Bulk density: 1900 kg / m³
• Thermal expansion: approx. 1,1 x 10-6 K-1
• Thermal conductivity: 600°C = 0,53 W/mK
700°C = 0,55 W/mK
800°C = 0,58 W/mK
• Bending strength: approx. 8 MPa
• Cold crushing strength: 40 – 50 MPa
• Molten aluminium testing: 72h / alloy 7075 / 816°C
No penetration, rating : excellent
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Single Filterbox Liner
![Page 7: Modern Refractories for the Casting Lines Materials and](https://reader030.vdocuments.site/reader030/viewer/2022012504/617ee212a617132460459bdd/html5/thumbnails/7.jpg)
DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Complete Filterbox
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Double 20“ Filterbox Liner
![Page 9: Modern Refractories for the Casting Lines Materials and](https://reader030.vdocuments.site/reader030/viewer/2022012504/617ee212a617132460459bdd/html5/thumbnails/9.jpg)
DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Double 23“ Filterbox
![Page 10: Modern Refractories for the Casting Lines Materials and](https://reader030.vdocuments.site/reader030/viewer/2022012504/617ee212a617132460459bdd/html5/thumbnails/10.jpg)
DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Custom-shaped 20“ Filterbox
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Liner for a FDU Degasser
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
High Alumina Castable
High Aluminium Castables are a refractory material, which is
originally used in certain furnace sections.
Advantages:
• high strength
• high erosion resistance
• high resistance to Aluminium penetration for extended
contact times
Disadvantages:
• low resistance to thermal shock
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
High Alumina Castable
Drache uses the same production route for high Alumina
castables like for Fused Silica:
• mixing of raw materials / bulk materials (with water) in an
intensive mixer
• casting into moulds
• pre-drying at ambient conditions
• enforced drying / firing in a kiln
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Precast Section for a DBF
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Precast Section for a DBF
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Relined DBF
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Calcium Silicate
Calcium Silicate is a ceramic material which characterized by
its low thermal conductivity, good strength as well as a very
good machinability.
Calcium Silicate is either available as board material or as
fully machined shapes.
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Calcium Silicate
Drache offers four grades of Calcium Silicate:
DKS 100 - carbon fiber reinforced
DKS 150 - cordierite particle increased
DKS 200 - carbon fiber reinforced
- high quality
DKS 250 - M1A Promat material
- thermal pre-treated
- without reinforcement
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Calcium Silicate
Applications:
launder dams
header plates
spouts
Transition plates
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Calcium Silicate – Launder Dams
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Calcium Silicate – Launder Dams
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Calcium Silicate – Header Plate
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Calcium Silicate – Transition Plates
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Insulation
Vessels relined with Fused Silica or High Alumina precast
shapes should be properly insulated, to minimize the heat loss
and achive the maximum performance from the precast
shapes.
Typical Drache insulation set-up:
• 40 or 50 mm of micropouros board
• Dri-Vive dry insulation granulate
• Carath insulating refractory concrete
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Filterbox lined with WDS Board
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
DBF lined with WDS Board
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle
Further Services
Further services for precast shapes from Drache include:
• full engineering services
• fully customization of precast shapes
• heat loss calculations
• flow calculations (for launders)
• on-site installation and commissioning services
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DRACHE
Modern Refractories for Casting Lines
www.drache-gmbh.de May 2013 Jochen Schnelle