Refractory mortar is the auxiliary product for construction of refractory brick and furnace wall, mainly including fire clay refractory mortar, high alumina refractory mortar, siliceous refractory mortar, magnesia refractory mortar, etc.
Fire Clay Refractory Mortar
The main material of fire clay refractory mortar is hard chamotte, combined with soft fire clay or chemical bond. It is mainly used in blast furnace, hot-blast furnace, coking furnace, soaking pit furnace, heat exchange, boiler, etc.
Fire clay refractory mortar is of high fire resistance, strong glass erosion resistance, good operational performance, strong bonding property, good water retaining property & workability and without sediment by making into slurry. It combines with ceramic under high temperature further improving all properties. High packing density and less water consumption make compact structure of brickwork.
Please stir well with water while using. The volume of water changes according to the consistence. The mud hanging should be full and even while construction.
The refractoriness of fire clay refractory mortar is 1580~1750℃, water content of ≤6%. The Fe2O3 content for blast furnace construction should be less than 2.5%.
Physical and chemical index:
Grain Size of Fire Clay Refractory Mortar
Through Sieve Pore For Blast Furnace Fine Grain Medium Grain Coarse Grain 0.125mm ≥65% ≥50% ≥25% ≥15% 0.5mm ≥100% ≥97% - - 1.0mm - ≥100% ≥97% - 2.0mm - - ≥100% ≥97% 2.8mm - - - ≥100%
Notes: Fine grain mortar should be used for belly and waist of blast furnace.
Contents of Fire Clay Refractory Mortar and Binding Clay
Name For Blast Furnace & Fine Grain Medium Grain Coarse Grain Chamotte 80-85% 75-80% 65-75% Binding Clay 15-20% 20-25% 25-35%
High Alumina Refractory Mortar
The main material of high alumina refractory mortar is high chamotte, the binding agent is soft clay or chemical bond. The content of Al2O3 is determined by the brick composition and using request of construction part. It can be widely used in all kinds of industry furnaces with high alumina bricks, such as the construction of furnace roof, regenerative chamber, combustion chamber and other parts of hot-blast furnace, upper part and other parts of blast furnace, the repair of furnace top, furnace wall and other parts of industrial furnaces.
According to the content of Al2O3, high alumina refractory mortar can be divided into LN-55A, LN-65A and LN-75A, for blast furnace construction should be within 2.5%. The refractoriness is 1750~1790℃, loss on ignition should be ≤5%.
Physical and chemical index:
Item LN-55A LN-65A LN-75A Refractoriness, ℃ , ≥ 1770 1790 1790 Al2O3, %, ≥ 55 65 75 Cold bending resistance, bond strength, ≥ 110 ℃ after drying 1 1400 ℃ x3h after sintering 4 Permanent Linear Change % 1400 ℃ x3h after sintering +1~-5 Bonding Time, min 1~3 Particle size, % -1.0mm 100 +0.5mm ≤ 2 -0.074mm≥ 50
Siliceous Refractory Mortar
Siliceous refractory mortar can be divided into three types (93, 90, 85) based on physical & chemical indexes. The refractoriness is 1580~1700℃.
The grain composition: the grain remnant on 1.0mm sieve should be within 3%, the grain past 0.2mm sieve should be more than 80%.
Magnesia Refractory Mortar
Magnesia refractory mortar divided into MgO-82 and MgO-78 according to physical & chemical index. The content of SiO2 is 5%-9%, loss on ignition should be ≤2%.
Notes: Because magnesia refractory mortar is of thixotropy, so it should be hit until being soft from the bucket before using.
Notes: the kind of refractory brick you use determines the kind of refractory mortar you should choose. If you are not clear, contact us, we will recommend you the suitable product.