Electrode Paste Ash Content, Electrode Paste Raw Material

 1. Standard electrode paste. The standard electrode paste are mainly used into open submerged arc furnace. One of them is used for small and medium open ferroallloy furnaces or calcium carbide furnace. The baking environment is good and the current load is low, therefore the requests for electrode paste raw materials is not very strict, so that even high ash content(11% max) is also acceptable, and using medium temperature asphalt as binder. Another electrode paste is mainly used for big open calcium carbide furnaces which have a high current load. This type of furnace need the electrode paste to have a lower specific resistivity, lower ash content(7%max) and quicker baking ratio. Therefore, during production, we should use lower ash content raw materials or add some natural graphite or graphite scarp. In order to accelerate the baking ratio of electrode paste, putting certain Coal tar, anthracene oil into the medium temperature asphalt to adjust the soften point to 60℃。

2. Closed electrode paste. Closed electrode paste is the superior materials used in closed submerged arc furnace. Sealing the furnace surface is the trending of submerged furnace. After closing the furnace surface, it can recycle a lot of combustible gas which is conducive to energy saving and can improve operating environment. However, sealing the furnace surface can reducing a lot of radiant heat. This will against the electrode paste baking. So, this will request the ash content of closed electrode paste to be under 6%, have a very low resistivity and very high thermal conductivity. Producing closed electrode paste need to use superior anthracite, better to use GCA and petroleum powder, adding some graphite scrap and adjust the soften point of coal tar pitch.

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