Cold-ramming paste heat-conducting contact masses for aluminum electrolyers
Products description :
Cold ramming paste refers to a cathode paste that can be laid at room temperature. It is a carbon-filled raw material for masonry.
It is widely used in industrial furnaces such as aluminum reduction cells, iron-making blast furnaces, smelting furnaces, and calcium carbide furnaces. The aggregate of this
cathode paste is the same as that of ordinary cathode paste (also called hot stamping paste), such as ordinary calcined anthracite or electric calcined anthracite, metallurgical coke, graphite crushing, etc. The low softening point of the adhesive is 20 ºC ± 5 ºC.
According to the softening point of the binder and the construction temperature, the cathode paste can be divided into hot paste, medium temperature paste and cold paste. The application temperature of cold paste is 8 ºC ~ 25 ºC, the application temperature of medium temperature paste is about 50 ºC, and the application temperature of hot paste is over 100 ºC. According to the particle size of the aggregate and the size of the filling gap, it can be divided into thick paste and fine paste. The thin seam paste is used to bond the carbon seam of less than 2mm, and its aggregate is mainly coke powder of less than 100 mesh. The thick seam paste is used to fill larger gaps and to smash the carbon pad. Press the use part. Cathode paste can be divided into peripheral paste (peripheral paste), carbon paste, and steel rod paste. According to the different aggregates used, it can be divided into semi-graphite cathode paste and ordinary cathode paste. The semi-graphite cathode paste is used in conjunction with the semi-graphite cathode carbon block, and the ordinary paste is used in conjunction with the ordinary carbon block.
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Cold-ramming low-contracting masses are used for ramming interblock and peripheral joints of aluminum electrolyzers at temperatures of 25±10°C. In combination with the base block, the mass ensures the uniformity of the bottom lining in the electrolyzer. The composition of the mass guarantees the uniformity of all physical-chemical processes of baking and a low degree of expansion and contraction.
Cold-ramming mass properties
| PROPERTIES |
VALUE |
| Apparent density of unbaked mass, g/cm3 |
1,50-1,65 |
| Apparent density of baked mass, g/cm3 |
1,38-1,50 |
| Compressive strength, MPa, min. |
10-25* |
| Open porosity of baked mass, % |
21 |
| Volume expansion, % |
0-2,5 |
| Degree of compaction, % |
55-75 |
| Contraction rating, max, % |
0,3 |
| Electrical resistivity, max, µm |
90 |
| Ash content, %, max, % |
3,5 |
| * the values difference between two mass batches shall not exceed 10 MPa. |
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