Why do we need cement kiln refractories

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Why do we need cement kiln refractories ?

 

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To prevent this!

cement kiln refractories

cement kiln refractories

 

  • 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 china

refractories china

 

Refractories according to PRE recommendations subdivided into the following technical qualities:

  • dense, shaped products
  • insulating, shaped products
  • dense, unshaped products
  • insulating, unshaped products
Tungsten Molybdenum Rhodium Platinum Carbon Boron Tungsten Carbide Silicon Carbide Magnesium Oxide Zirconium Oxide Calcium Oxide (Chromium Oxide) Aluminium Oxide Silicon Oxide

Tungsten
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
Refractories – Chemical Classification

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

  • Chemical classification of dense shaped refractory products according ISO 1109
Refractories – Chemical Classification

Refractories – Chemical Classification

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

Refractories – Types of Bonding

Refractories – Types of Bonding

  • Bonding types in magnesite-chrome refractories
Bonding types in magnesite-chrome refractories

Bonding types in magnesite-chrome refractories

  • Basic (MgO, CaO) refractory types
  • Main Factors Influencing Performance of MgO Sinter
Main Factors Influencing Performance of MgO Sinter

Main Factors Influencing Performance of MgO Sinter

  • Influence of CaO / SiO2 on Interstitial Phases in MgO Sinter
Influence of CaO / SiO2 on Interstitial Phases in MgO Sinter

Influence of CaO / SiO2 on Interstitial Phases in MgO Sinter

Classification of MgO-based Refractories

Classification of MgO-based Refractories

Classification of MgO-based Refractories

 

Structures of “Spinel” Bricks

Spinel  MgOAl2O3

Hercynite  FeOAl2O3

Mg-chromite  MgOCr2O3

Chromite  FeOCr2O3

Structures of "Spinel" Bricks

Structures of “Spinel” Bricks

  • Acidic (Al2O3 – SiO2) refractory types

Raw Materials for Al-Si-Refractories

  • Natural Raw Materials for Alumino-Silicate Refractories
Raw MaterialFormula Al2O3 Fe2O3 K2O+Na2O 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)

Raw Material Formula Al2O3 Fe2O3 K2O+Na2O
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
Raw MaterialFormula Al2O3 Mullite 3Al2O3•2SiO2 65 - 75 (sintered, fused) Alumina Al2O3 90 - 100 (tabular, fused) Corundum Al2O3 90 - 100 (sintered, fused)

Raw Material Formula Al2O3
Mullite 3Al2O3•2SiO2 65 – 75
(sintered, fused)
Alumina Al2O3 90 – 100
(tabular, fused)
Corundum Al2O3 90 – 100
(sintered, fused)

  • Non-shaped products
Unshaped Refractories

Unshaped Refractories

Unshaped Refractories11

  • Types of Refractory Castables
DesignationHCC MCC LCC ULCC NCC 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 <1.5 <1 <1 Workability ± ++ – – – – –

Designation HCC MCC LCC ULCC NCC
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

 

TO DOWNLOAD THE MOST IMPORTANT BOOKS , MANUALS , OPERATION NOTES , FORMUFLAS , EXCEL SHEETS CLICK HERE NOW !!

 

 

 

 

 

 

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Posted in Cement Kiln Refractories, kiln refractories and lining, Maintenance Engineering.

9 Comments

  1. Thanks for the helpful information! I do craft posts on my own blog, but it never occured to me that I could do something similar as a paid contributor on other websites.

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