Electrode paste supply, electrode paste height refers to the height from the upper end of the electrode clip to the top of the electrode paste. If the electrode paste is too high, the coarse and fine particles in the electrode paste are prone to delamination, or the electrode cylinder is swollen due to the pressure of the paste column. If the electrode paste column is too low, it is difficult to obtain a dense electrode because the pressure of the paste column is too small and the filling property is poor. Electrode paste consumption is too fast. The proper height of electrode paste column is conducive to improving the quality of electrode roasting and reducing consumption. If the particle size is too large, it is easy to cause electrode paste suspension failure; If the particle size is too small, it is easy to cause spray paste.
When the sintering temperature of the electrode paste is below 300 ℃, the electrode paste is in a plastic state with low mechanical strength. According to the test and calculation of Fuzhen carbon technicians, the compressive strength is only 3-10Mpa at this time, and there is almost no tensile strength. The electrode paste soft breaking accident of submerged arc furnace often occurs in this section. When the sintering temperature of electrode paste is 300-800 ℃, as the volatile of coal tar pitch has been discharged, the remaining coal tar pitch has been carbonized to form a network, which is fused with the raw materials of various electrode pastes, and the mechanical strength reaches the standard value.
Our Fuzhen carbon technician estimated that the compressive strength of the electrode paste at this time was 17-33mpa, the flexural strength was 7-17mpa, and the tensile strength was 4-8mpa. After the electrode below the copper tile of the submerged arc furnace enters the smelting process, due to the further rise of the raw material temperature, the temperature of the electrode will also rise further, and the mechanical strength will increase with the rise of the temperature. When the temperature rises to 1500 ℃, the mechanical strength of other materials will drop sharply, such as heat-resistant alloys, while the mechanical strength of carbon materials is still increasing at 1500 ℃, Only the mechanical strength of carbon materials at 2200 ℃ began to decline gradually. Therefore, carbon materials have advantages as high temperature resistant materials. The sintering of electrode paste is a very complex process
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