The main factors affecting the consumption of graphite electrodesThe consumption of graphite electrodes in electric furnace steelmaking runs through the entire

The main factors affecting the consumption of graphite electrodes

The consumption of graphite electrodes in electric furnace steelmaking runs through the entire smelting process, and its consumption is affected by many factors. This is only the operation of the smelting process for analysis.

(1) The poor quality or improper ratio of scrap steel results in poor slag-making effect and prolongs the smelting time; the increase in the number of feeds and borehole data increases the probability of damage and breakage of the electrode bottom; the longer smelting time results in electricity consumption and electrode consumption. The direct factor of the increase in losses.

(2) The electric furnace power supply equipment does not match the electrode specifications

Electric arc furnace power transmission is a high-current low-voltage operation. If the capacity of the power supply equipment is too large to exceed the limit load of the electrode, the electrode within the arc starting 5~10min will have redness from bottom to top, the boundary line of the connection is very obvious and most of the breaking accidents occur; the current is too high or the fluctuation is too large, The breaking frequency of the joint type at the connection is increased and the bottom consumption is cone-shaped. If the power supply capacity is low, the furnace temperature will not meet the process requirements within the effective medium heat time, and the operation will be delayed. Overload and overtime operation will cause the greatest loss and consumption of graphite electrodes.

(3) During the oxidation period, it is mandatory to increase the chemical energy and increase the smelting intensity

In smelting, the oxygen blowing rate is forced to increase (usually less than 45M3/T) to achieve rapid melting and increase furnace temperature, which will easily make the furnace condition bad and the furnace and the furnace are in a rich state, so that each phase electrode is in a high-temperature flame . When the electrode is in this furnace environment, most of the layers and the surface are seriously oxidized.

(4) Technicality of the configuration and operation of the electric furnace

Modern electric arc furnaces are fundamentally different from traditional electric furnaces. The emergence of ultra-high-power large-scale electric arc furnaces and hot charging steelmaking processes have improved the smelting strength and productivity, and thus put forward higher technical requirements for the quality of graphite electrodes. The selection of power transmission curve and gear during operation, the control of arc starting and arc stabilization voltage and current, the use of long, medium and short arcs, the configuration and application of water cooling systems, etc., all affect the service life and consumption of the electrode. Played a key role.

(5) The quality of graphite electrode

Nowadays, the smelting and process of electric arc furnaces are increasingly demanding the oxidation resistance and thermal shock resistance of graphite electrodes, and the excessive consumption due to quality fluctuations has attracted great attention from direct users. Therefore, the balance and stability of the graphite electrode quality are the most important factors that determine the consumption.