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Monolithic Magnesia Refractories

   Monolithic magnesia refractories include gunning material, ramming material, castable material, coating material and mortar which are mainly used for the making and mending of bottoms and linings of high temperature furnace. Since the manufacturing processes of most of these materials are of  similarity here we basically introduce that of gunning material. 

1. Gunning Material

   It takes sintered magnesite and/or sintered dolomite and some materials of magnesium and calcium substance as main feed and is made with which under specific blending ratio and various additives and inorganic binders. It is featured by quick solvency, instant hardening, low rebound elasticity and easy gunning operation. It is mainly used for the mending of  magnesia carbon based or magnesia based linings of various basic steel making furnaces. 

    Specs     \    Brand PB-88G PB-22W PB-8216 PB-8210 PB831 PB833 PB837 MC802

MgO %

≥88 ≥78 75-80 80-86 ≥86 ≥74 ≥74 ≥92

Refractoriness SK

38 37 ≥38 ≥38 38≥ ≥38 ≥38 ≥38

 Sizing
 %
 mm

≤0.044 - ≥29 - - - - - -
≤0.074 - - 32-42 32-42 25-30 20-30 20-30 -
0-1 - >49 - - - - - -
1-3 - >22 20-30 20-30 - - - -
1-4 - - - - - 60-75 60-75 -
1-5 - - - - 50-70 - - -

Bulk Density g/cm3

3.15 - - - - - - -

Bending Strength*MPa

- 1.75 - - - - - -
*It is tested under 1,400 C for 0.5 hours.

   
2. Dry Ramming Material for the Bottom of Electric Arc Furnace

   It is made of some high purity materials finely through processes of batching, shaping, sintering and synthesizing then crushing, screening and final blending. It is featured by quick sintering, high density, high strength, good thermal resistance and volume stability and widely used in making the bottoms of various electric arc furnaces. Its characteristics have come up to Austrian standards of  same kind and its serving lives have come up to and even beyond the standards of same kinds imported from some Western countries.

Properties / Product Series

MCF-5 MCF-7
MgO % 88.0 83.6
CaO % 4.8 7.2
Fe2O3 % 5.0 7.0
Al2O3 % 0.4 0.5
SiO2 % 1.2 1.3
L.O.I. % 0.2 0.2
 Sizing  in mm 0-8 or 0-5 0-8 or 0-5
Bond Character ceramic ceramic
Crushing Strength MPa 1,200Cx3hours 27.2 33.6
1,600Cx3hours 58.5 65.8
Bulk Density g/cm3 1,200Cx3hours 2.78 2.86
1,600Cx3hours 3.04 3.08
Linear Change at 1,600C % <1.8 <2.0
Limited Temperature in Use C 1,850 1,850
Operating Method paving at normal temperature and dry ramming mending under thermal state

3. Magnesia Tundish Coating Material

   This product is made of  tow kinds of high quality magnesia adding some auxiliary materials such as composite binders, composite antiknock reagent, intensifying agent, plasticity agent and water reducer. It is featured by many excellent performances like easy operation, non-cracking under firing, good resistance against molten steel and slag corrosion and easy disassembly.

Chemical & Physical Properties Factory Standard Values Typical Values
Bulk Density g/cm3 110Cx24h ≥2.0 2.08
1500Cx3h ≥2.0 2.12
Bending Strength MPa 110Cx24h    
1500Cx3h    
Crushing Strength MPa 110Cx24h ≥5.0 8.6
1500Cx3h ≥10.0 15.8
Linear Change after fired % 1500Cx3h -2.0 ~ -4.0 -2.35

Chemical Composition
 %

MgO 80-89 86.5
CaO ≤2.5 1.74
SiO2 ≤8.0 7.52
Fe2O3   1.33
Al2O3   1.25
L.O.I.   1.50

Size mm

0-3 0-3

Moisture %

14.0-17.0 15

4. Magnesia Mortar

   This product is made of finely ground magnesia and featured by good evenness and stability of chemical composition and sintering by air-hardening. It is favorable refractory mortar for furnace mending and magnesia based refractory bricks laying. 



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Phone: (411) 8364 8293,    Fax: (411) 8363 7530,    Email: sales@magnesite.com.cn

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