Sintering of electrode paste in submerged arc furnace of manganese-silicon alloy

Pubdate: 12-11 2021

The electrode is the only channel for the electric furnace to input electric energy, and it can also be said to be the heart of the electric furnace. Therefore, making the electrode have good working conditions is the key to the successful opening of the furnace.

Large-scale submerged arc furnaces generally use self-baking electrodes. Self-baking electrodes use anthracite, pitch, etc. as raw materials to make electrode paste at a certain temperature, and then put the electrode paste into the installed electrode shell and then sinter and coke. . Therefore, to make a reasonable oven system, it is necessary to understand the sintering characteristics of the electrode paste.

Sintering process of Rongxin carbon electrode paste self-baking electrode

The self-baking electrode sintering process is a process in which the binder decomposes and gradually discharges volatiles as the temperature increases. The sintering of the electrode can be roughly divided into three stages. The first stage: the temperature rises from outdoor air temperature to 200°, and the electrode paste melts from lumps to all liquid; the second stage: the temperature rises from 200° to 600°, during which all the binders in the electrode paste begin to decompose and gas The volatile matter is discharged, especially at about 400°. The electrode paste gradually changes from a plastic state to a solid state; the third stage: the temperature rises from 600° to 800°, and a small amount of volatile matter continues to be discharged. After a certain period of time, The electrode sintering is over.

The volatiles of Rongxin Carbon Electrode Paste are discharged from two locations: as the binder is thermally decomposed, the volatiles are discharged, the volume expands and contracts, and the volatiles are discharged along the gap between the electrode and the electrode shell; vaporization The components with lower temperature escape from the upper mouth of the electrode shell.

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