Aluminum Electrolytic Cell Castable Description
Aluminum electrolytic cell castable is mainly used in aluminum smelting furnace, aluminum press casting heat preserving furnace and so on. Although the melting point of aluminum is not high, only about 660℃, aluminum liquid has low viscosity, high permeation ability and high activation property, which makes it have drastic corrosion to refractory furnace lining. Currently, all the refractory material used in aluminum electrolytic cell can react with aluminum liquid and produce large amount of aluminum ash, so the refractory material life is shortened, aluminum is wasted and the quality of aluminum liquid is also affected by impurities.
The Damage Mechanism Of Refractory Lining
1. Aluminum liquid can react with SiO2 in Al2O3-SiO2 series refractory material and produce Al2O3+Si. So the structure of Al2O3-SiO2 refractory is destroyed, meanwhile, Si impurity also contaminates aluminum liquid.
2. Aluminum liquid can infiltrate into refractory material pores, increases the contacting area of refractory material and change the composition. When the infiltration reaches to a certain depth, accompanied with the reaction of aluminum and SiO2, refractory material will have structural spalling.
Aluminum Electrolytic Cell Castable Property
To solve this problem, refractory material contacting with aluminum liquid should adopt specially designed aluminum electrolytic cell castable, which has high density(low porosity), excellent high temperature, middle temperature and cold strength, its strength is positively correlated to temperature. Meanwhile, aluminum electrolytic cell castable has good volume stability at different temperature. With the addition of ultra micro powder component, the porosity of aluminum cell castable is lower than 10%, the average pore aperture is only 0.5μm. So aluminum liquid can’t permeate into aluminum electrolytic cell castable lining. What’s more, composite additives is added in aluminum cell castable to increase aluminum liquid’s contact angle with castable lining, therefore the lining has high aluminum liquid permeation resistance.
Aluminum Electrolytic Cell Castable Physiochemical Index
| Item |
BZL-1 |
BZL -1A |
BZL-M |
BZL-F |
BZL-G |
| Chemical composition |
Al2O3≥ |
60 |
65 |
65 |
70 |
80 |
| Fe2O3≤ |
0.6 |
0.5 |
0.4 |
0.4 |
0.3 |
| BaO+ZnO+B2O3≥ |
3 |
3 |
3 |
4 |
4 |
| Bulk density g/cm3≥ |
2.4 |
2.5 |
2.65 |
2.7 |
2.8 |
Compression strength
Mpa≥ |
110℃*24h |
35 |
40 |
40 |
45 |
45 |
| |
1300℃*16h |
40 |
45 |
45 |
50 |
50 |
Rupture strength
Mpa≥ |
110℃*24h |
5 |
10 |
10 |
12 |
14 |
| |
1300℃*16h |
10 |
13 |
13 |
15 |
16 |
| Linear change rate % (1300℃*3h) |
0～+0.2 |
0～+0.2 |
0～+0.2 |
0～+0.1 |
0～+0.1 |
Main Advantages of Aluminum Cell Castable
1. Won’t react with aluminum liquid, no aluminum ash, no corrosion, no accretion, aluminum liquid loss is greatly reduced.
2. Low porosity and small pore diameter, aluminum liquid adhesion and permeation is avoided.
3. No reaction impurity, aluminum quality is greatly improved.
Aluminum Electrolytic Cell Castable Application
Aluminum electrolytic cell castable is specially developed for aluminum processing industry, it is mainly used in aluminum melting furnace wall, furnace bottom, degassing tank, launder and fore-tank. Aluminum electrolytic cell castable is also used for the furnace lining of keeping furnace, aluminum liquid heat preserving furnace, aluminum ladle and so on. It is especially suitable for the integral casting of heat preserving furnace and lining of high purity aluminum smelting equipment. Aluminum electrolytic cell castable synthesizes the characteristics of organic binders and inorganic binders, added in certain quantity of new type composite material, can effectively avoid the infiltration of aluminum liquid and significantly prolong the service life of refractory castable lining.
