Loading Port:China main port
Payment Terms:TT OR LC
Min Order Qty:25 m.t.
Supply Capability:2000 m.t./month
Definition
It is a non-metal inorganic construction material based on calcium aluminate(CaO•Al2O3) or calcium dialuminate(2CaO•Al2O3).It is made up by the way of having natural bauxite or industrial alumina and calcium carbonate(limestone) which are in certain proportion calcined or electric melted, it can also be made through melting laterite and limestone. Compared with silicate cement, calcium aluminate cement has a higher refractoriness, thus it is widely used as binder of refractory castable.
Category
Calcium aluminate cement is sorted into two kinds by chemical composition: common calcium aluminate cement (Al2O353%~72%,CaO21%~35%) and pure calcium aluminate cement(Al2O372%~82%,CaO19%~23%). And common calcium aluminate cement is divided into low iron type(Fe2O3<2.0%) and high iron type(Fe2O37%~16%). The low iron type calcium aluminate cement which has a Al2O3 content of 53%~56% and CaO of 33%~35% is called bauxite cement; the one which has a Al2O3 content of 59%~61% and CaO of 27%~31% is called Aluminium-60 cement; the one which has a Al2O3 content of 65%~70% and CaO of 21%~24% is called low calcium aluminate cement, another kind is fast hardening super early strength calcium aluminate cement. And pure calcium aluminate cement is divided into conventional type (Al2O3 content is 72%~78%)and super high alumina type(Al2O3 content is 78%~85%).
Specifications:
Specification of three grads of CA50 | ||||
Mark | A600 | A700 | A900 | |
Composition (%) | SiO2 | ≤7.8 | ≤7.5 | ≤5.5 |
Al2O3 | ≥50.0 | ≥51.0 | ≥53.5 | |
Fe2O3 | ≤2.5 | ≤2.5 | ≤2.5 | |
Fe2O3 | ≤0.4 | ≤0.4 | ≤0.4 | |
SSB (m2/kg) | ≥300 | ≥320 | ≥350 | |
Initial Setting Time(min) | ≥45 | ≥60 | ≥90 | |
Final Setting Time (h) | ≤6 | ≤6 | ≤6 | |
Breaking Strength(MPa) | 1d | ≥6.0 | ≥6.5 | ≥8.0 |
3d | ≥7.0 | ≥7.5 | ≥10.0 | |
Compressive Strength(MPa) | 1d | ≥45 | ≥55 | ≥72 |
3d | ≥55 | ≥65 | ≥82 | |
Item Briand |
CA70 |
CA80 | |
Chemical Composition % | SiO2 | ≤1.0 | ≤0.5 |
AL2O3 | ≥68.0 | ≥77.0 | |
Fe2O3 | ≤0.7 | ≤0.5 | |
R2O | ≤0.4 | ≤0.4 | |
S | ≤0.1 | ≤0.1 | |
Cl | ≤0.1 | ≤0.1 | |
325M Residue on Sieve (%) | ≤5 | ≤5 | |
Surface Area (m2/kg) | ≥400 | ≥450 | |
Initial Setting Time (min) | ≥45 | ≥45 | |
Final Setting Time (h) | ≤6 | ≤6 | |
Breaking Strength (MPa) | 6h | -- | -- |
1d | ≥5.5 | ≥5.0 | |
3d | ≥6.5 | ≥6.0 | |
Compressive Strength (MPa) | 6h | -- | -- |
1d | ≥40 | ≥30 | |
3d | ≥50 | ≥40 | |
Application
Calcium aluminate cement is mainly used as binder of refractory castable and gunning mix. Common calcium aluminate cement is applicable to low-grage and medium-grade refractory castable, such as firecaly castable and high alumina castable etc; Pure calcium aluminate cement is applicable to high-grade refractory castable, such as corundom castable, mullite castable, chrome containing corundum castable and spinel castable etc; The calcium aluminate cement addition quantity of common refractory castable is 10%~20%, low cement castable is 5%~10%, super low cement castable is less than 5%. Addictives which can improve workability may be added to castables bond by calcium aluminate cement so as to meet the requirements of construction, such as setting accelerator, setting retarder, water reducer (dispersant), plasticizer etc.
