Contents
Why do we need cement kiln refractories ?
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To prevent this!
- Definition / Classification
- Selection Criteria
- Analysis of refractory degradation
Definition & Classification
- Definition & classification
- Types of bonding
- Basic (MgO, CaO) refractory types
- Acidic (Al2O3 – SiO2) refractory types
- Non-shaped products
- Examples
According to ISO R 836, refractories are defined as
“non-metallic materials having a minimum pyrometric cone equivalent of 1500 °C”
Refractories according to PRE recommendations subdivided into the following technical qualities:
- dense, shaped products
- insulating, shaped products
- dense, unshaped products
- insulating, unshaped products
Molybdenum
Rhodium
Platinum
Carbon
Boron
Tungsten
Carbide
Silicon
Carbide
Magnesium Oxide
Zirconium Oxide
Calcium Oxide
(Chromium Oxide)
Aluminium Oxide
Silicon Oxide
Refractories – Chemical Classification
- Chemical classification of dense shaped refractory products according ISO 1109
- Chemical classification of dense shaped refractory products according ISO 1109
- Chemical classification of dense shaped refractory products according ISO 1109
classification of Types of Bonding
According to Production Temperature
- Unfired products
- Fired between 150 to 800 ºC
- Fired at >>800 ºC
According to Material Nature of Bond
- Hydraulic
- Organic
- Inorganic
- Fireclay
- Ceramic
Types of Bonding
- Bonding types in magnesite-chrome refractories
- Basic (MgO, CaO) refractory types
- Main Factors Influencing Performance of MgO Sinter
- Influence of CaO / SiO2 on Interstitial Phases in MgO Sinter
Classification of MgO-based Refractories
Structures of “Spinel” Bricks
Spinel MgO•Al2O3
Hercynite FeO•Al2O3
Mg-chromite MgO•Cr2O3
Chromite FeO•Cr2O3
- Acidic (Al2O3 – SiO2) refractory types
Raw Materials for Al-Si-Refractories
- Natural Raw Materials for Alumino-Silicate Refractories
Fireclays Al2O3•2SiO2•2H2O 25 – 45 1.5 – 3.5 1 – 2
(Kaolin, Ball, Fire, Flint)
Sillimanite Al2O3•SiO2 45 – 65
Kyanite Al2O3•SiO2 45 – 65
Andalusite Al2O3•SiO2 45 – 65
Bauxite Al2O3•2H2O 80 – 90 < 2.0 0.02 – 0.6
(Calcined Refractory Grade)
- Synthetic Raw Materials for Alumino-Silicate Refractories
Mullite 3Al2O3•2SiO2 65 – 75
(sintered, fused)
Alumina Al2O3 90 – 100
(tabular, fused)
Corundum Al2O3 90 – 100
(sintered, fused)
- Non-shaped products
- Types of Refractory Castables
Cement Content High Medium Low Ultra Low None
CaO (%) >5 3 – 8 1.5 0.5 0.1
Al2O3 (%) >50 >35 >50 >70 >90
Fe2O3 (%) 0.5 – 20 0.5 – 4.0 Workability ± ++ – – – – –
if you have any questions
please Contact Refractories Team : project20062015@gmail.com
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Thanks for the data shared.
For more information on “Properties and Type of Refractory required for Cement Rotary Kiln”, “How to minimise Refractory Failure and wear of Refractories inside a Rotary Kiln” and more please visit
http://www.industry.guru/cement-industry-news-cement-plant-technology.html
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