small graphite electrode

6 measures to reduce the consumption of small graphite electrode in submerged arc furnace

Small graphite electrode teaches you how to reduce the consumption of small graphite electrode in submerged arc furnace. The main factors that affect the consumption of small graphite electrode are smelting process characteristics, material and quality of small graphite electrode, oxidation of the surface of small graphite electrode, and load of submerged arc furnace. , Small graphite electrode accident and small graphite electrode management. Measures to reduce the consumption of the small graphite electrode are mainly based on the improvement of the small graphite electrode material, the surface treatment of the small graphite electrode, and the cooling of the small graphite electrode.

After the surface oxidation loss of the small graphite electrode is reduced, the head loss of the small graphite electrode is also reduced. The specific measures are as follows:

(1) Small graphite electrode with cermet coating. The coated small graphite electrode uses ordinary small graphite electrode as the raw material. The surface is sprayed with a layer of metal aluminum film with a plasma spray gun, and a layer of refractory slurry is coated on the outside of the aluminum layer. Finally, the high temperature of the arc is used to melt the metal aluminum and the refractory together. Repeatedly 2 to 3 times to form a cermet layer that can conduct electricity and resist oxidation at high temperatures. The anti-oxidation coating has the following properties: the resistivity is 0.07?0.1μΩ; below 900℃, no gas penetration will occur within 50 hours of work; the decomposition temperature of the coating material is above 1850℃. Compared with the small graphite electrode of the same quality, using the small graphite electrode with anti-oxidation coating can reduce the consumption of the small graphite electrode by 20%-40%.

(2) Inorganic salt impregnated small graphite electrode. The use of borate and phosphate dipping methods can improve the oxidation resistance of the small graphite electrode and at the same time increase the strength of the small graphite electrode. The impregnation process is carried out under low vacuum conditions. The preheated small graphite electrode is immersed in the hot impregnating liquid to make the inorganic salt penetrate into the micropores of the graphite. The impregnation process is 3 to 4 hours, and then it is dried and surface treated. The surface conductivity of the impregnated small graphite electrode is better than that of the coated small graphite electrode. Using the impregnated small graphite electrode can reduce the consumption of the small graphite electrode by about 20%.

(3) Inorganic salt and metal powder coating. The small graphite electrode is coated with inorganic salt with chromium, molybdenum and silicon carbide powder, which can improve the oxidation resistance of the small graphite electrode to a certain extent.

(4) Water spray cooling method on the surface of the small graphite electrode. An annular water spray pipe is installed under the small graphite electrode holder, and water is sprayed evenly on the surface of the small graphite electrode, forming a thin water film on the surface of the small graphite electrode. The vaporization of water absorbs a large amount of heat from the small graphite electrode, which reduces the surface temperature of the small graphite electrode and reduces the oxidation loss of the small graphite electrode.

(5) Combine small graphite electrode. The combined small graphite electrode consists of a metal water-cooled small graphite electrode and a small graphite electrode with screw joints. The metal small graphite electrode on the upper part is in contact with the copper head and is responsible for transferring current from the copper head to the small graphite electrode. The cooling water of the metal small graphite electrode takes away the heat of the small graphite electrode, reduces the temperature of the small graphite electrode, and to a certain extent reduces the speed of the oxidation loss of the small graphite electrode. Using the combined small graphite electrode can reduce the consumption of the small graphite electrode by 20% to 30%. The disadvantage of the combined small graphite electrode is that the extension procedure is complicated, which prolongs the power outage time and increases the workload.

(6) New composite small graphite electrode. The new composite small graphite electrode used in the metal silicon submerged arc furnace consists of a graphite core and an external self-baking small graphite electrode paste lining. The fired small graphite electrode is extruded from the steel shell to ensure that the small graphite electrode is continuously lowered.