Global graphite electrode capacity & Continuous consumption processes of eaf electrode

By:Yvonne Jun 28, 2020
Global graphite electrode capacity & Continuous consumption processes of eaf electrode
The consumption of Eaf graphite electrode depends on the quality of electrode itself and the condition of arc furnace, So let DanCarbon talk about Eaf electrode wear mechanism, Global graphite electrode capacity & Continuous consumption processes of eaf electrode.
1. Global graphite electrode capacity
In 2017, China had an effective Graphite Electrode capacity of 900,000 tonne and a production capacity of 630,000 tonne. It produced almost 700,000 tonne of Graphite Electrode.Statistics maintained by the China Carbon Industry Association (CCIA) reveal that by December 2018, the newly-added Graphite Electrode capacity in China was 600,000 tonne. From Jan to Aug’18, Graphite Electrode output in China was 416,392 tonne, up 14.18% on a Y-o-Y basis. By 2020, production and sales of Graphite Electrodes in the country will not exceed 800,000 tonne which will be less than the total capacity of 1.5 MnT, thus resulting in overcapacity.
2. Eaf electrode wear mechanism
The consumption of graphite electrode in Eaf steelmaking is mainly related to the quality management of working electrode materials and the condition of Eaf, such as old and new furnace, whether there is mechanical equipment failure, whether continuous production can be carried out, etc. And steelmaking operations, such as smelting steel, oxygen blowing time, loading conditions, etc. As well as the consumption of graphite electrode itself, its consumption mechanism has the following aspects:
a. The ultimate target consumption mainly includes the sublimation of graphite materials caused by the high temperature of the electric arc, and the loss of the extremely important part of the electricity which reacts with the chemical substances between the molten steel and the slag. The final temperature passing through the sublimation rate depends primarily on the current density of the electrode and on the diameter of the rear side of the oxidizing electrode.
b. The chemical composition of the side oxidation electrode is carbon. Under certain economic conditions, oxidation technology will occur with the ambient air, water vapor and carbon dioxide. The amount of oxidation at the electrode side is related to the unit oxidation rate and exposed area. Typically, the oxidizing electrode side should account for about 50% of the total electrode consumption. In recent years, in order to improve the melting speed of electric arc furnace, the frequency of oxygen blowing operation is increased, which leads to the increase of oxidation technology loss of working electrode. Redness is often observed and the taper of the lower electrode harness in the steelmaking process.
c. Joint loss When the electrode is used for continuous time to connect the upper and lower two electrodes in the enterprise, a pupil part of the electrode or the joint (i.e. the residual object) will be broken due to the oxidation thinning of the working electrode or the penetration of cracks. The residual loss is related to the shape of the joint, the internal structure of the electrode and the vibration and impact of the electrode column.
d. surface peeling in the smelting process, the electrode itself has poor resistance to heat shock.
e. Electrode fracture includes electrode trunk fracture and joint fracture. The electrode fracture is related to the quality and processing of graphite electrodes and joints as well as steelmaking operations.
3. Continuous consumption processes of eaf electrode
Graphite will be oxidized at a temperature of approximately 4000℃ and sublimated at 36500℃. It is a kind of brittle non-metal material. During operating in electric furnace, the top of graphite column which located in air is cooled by spraying water; In the bottom of graphite column, the temperature at the arc discharging point reaches 4000~200000℃. Affecting heat and phase transition, the electrode will be consumed continuously during oxidation, melt and sublimation processes; on the other hand, under the independent or combined effect of different external factors such as process, equipment and operation (for example, gravity, pressure, pulling force, fracturing force, vibration, power, looseness electromagnetic force, thermal stress, thermal shock etc), the electrode will be consumed discontinuously due to looseness, breakage or cracks.
  • China

    China's graphite electrode and needle cok

    In June 2021, China's graphite electrode exports maintained steady growth, and the total exports from January to June reached 214,600 tons.... ...Read More>>

  • China

    China's graphite electrode and needle cok

    In May 2021, the export volume of China's graphite electrode was 34,600 tons, with a year-on-year increase of 30.53%. From January to May 2021, China's export of graphite electrodes totaled 178,500 tons, an increase of 25.07% over the same period last year. Main exporting countries of graphite elect... ...Read More>>

  • India

    India's graphite electrode market prices

    June 2021. Graphite electrode market prices rise in India. The price of UHP600 will rise from Rs 290,000 / ton to Rs 340,000 / ton. HP450mm electrode price increased from Rs 225,000 / t to Rs 275,000 / t (22% increase). And the delivery time has been extended to September.... ...Read More>>

  • China graphite electrode, needle coke mar

    China graphite electrode, needle coke mar

    In April 2021, China exported 32,900 tons of graphite electrode, 17,100 tons of oil-based needle coke and 12,200 tons of coal-based needle coke. ... ...Read More>>

  • What is the function of graphite electrod

    What is the function of graphite electrod

    Graphite electrode is mainly used in electric arc furnace steelmaking and LF furnace refining, consumption of more than 80% of the graphite electrode. Electric arc furnace steelmaking is the use of electric current through the graphite electrode and metal between the high temperature of the arc to h... ...Read More>>

  • ISO9001 manufacturing and procesing of gr

    ISO9001 manufacturing and procesing of gr

    ISO 9001 is a global quality management system standard, which is the guarantee of the quality of graphite electrodes. Dancarbon graphite electrode products through the ISO9001 quality certification.... ...Read More>>