The baking of graphite electrode is a heat treatment process in which the pressed raw product is heated at a certain heating rate in the protective medium in th
The baking of graphite electrode is a heat treatment process in which the pressed raw product is heated at a certain heating rate in the protective medium in the heating furnace under the condition of isolating the air.
The purpose of baking is:
(1) Eliminate V.M
Graphite electrodes that use coal pitch as a binder generally emit about 10% of volatile matter after baking.
(2) Binder coking
Raw graphite electrode products are baked under certain process conditions to coke the binder and form a coke network between the aggregate particles. Under the same conditions, the higher the coking rate, the better the quality.
(3) Fixed geometric form
The ultimate goal is to keep the shape of the graphite electrode unchanged even if the temperature rises again.
(4) Reduce resistivity
On the basis of 1 and 2, the resistivity of graphite electrode drops drastically.
(5) The volume shrinks further
After baking, the diameter of the graphite electrode shrinks by about 1%, the length shrinks by about 2%, and the volume shrinkage is 2-3%.
shengmiao
Harm of too high temperature: when molten steel out of cooper mold, the billet shell is thin and easy to break out; The accelerated erosion of refractory can ea
shengmiao
1. The barrier function (mainly completed by the liquid slag layer) isolates the contact between air and molten steel, blocks the secondary oxidation of molten
shengmiao
In continuous casting, low corrosion resistance often occurs, which directly leads to uneven composition and will eventually affect the smelting quality. In or