Abstract:

This paper analyzes the cause of consumption in the use of graphite electrode, introduces the processing principle and production technology of antioxidant impregnated electrode, and the excellent characteristics of high-temperature antioxidant impregnated electrode. Improving the tightness of the electrode and preventing the C-O reaction of the electrode stomata from producing surface peeling, thus reducing the Improving the tightness of the electrode and preventing the C-O reaction of the electrode stomata from producing surface peeling, thus reducing the electrode consumption.

Key word:

impregnated electrode reduces consumption and reduces cost.

300mm RP Graphite Electrode

1. Preface

In recent years, the state has resolutely banned the strip steel, which has led to the plunge of the scrap steel price, and many new electric furnaces have been built in China, which has led to a great increase of graphite electrodes. Under such circumstances, in order to reduce the consumption of graphite electrodes, thus reducing production costs and improving economic efficiency, it was decided to carry out antioxidant treatment on graphite electrodes in the refining furnace of the steel mill.

In order to reduce the electrode consumption, our plant conducted a trial of antioxidant impregnated electrode, which achieved the effect of reducing electrode consumption by 12% and electricity consumption by more than 3%, and has been in batch use at present.

2. Mechanism and analysis of graphite electrode consumption

Graphite electrode in the use of graphite, petroleum coke, asphalt after forging, roasting molding, due to graphite particle reduction, binder volatilization, pyrolysis and other major, electrode in the production structure of tiny open pores, graphitization process due to the evaporation of ash impurities produce pores. In the refining furnace heating process, the electrode mainly has melt loss, heat vibration, C-O reaction, oxidation and fracture. Among them, electrode oxidation flaking accounts for more than 50% of electrode consumption. The ways to solve the large consumption of electrode are: ①, improve the denseness of electrode; ②, passivate the reactivity degree of graphite.

3. Application of high temperature antioxidant impregnated electrode

Our factory carries out the application of antioxidant impregnating electrode, adding electrode impregnating liquid in the vacuum tank, placing the electrode in the liquid, vacuuming the vacuum tank and slowly repressurizing the vacuum tank after the vacuum is pumped to 4-6MPa, due to the pressure difference inside and outside the electrode, the electrode impregnating liquid will enter into the air gap inside the electrode, making the electrode more dense, and secondly, the electrode impregnating liquid has the effect of high temperature antioxidant. The liquid has high temperature antioxidant effect; when using antioxidant electrode, the electrode especially has a protective film on the surface of the electrode, which prevents oxygen from contacting with the electrode, reduces oxidation and thus reduces flaking, and plays the purpose of reducing the consumption of the electrode; comparison between using and not using (see Fig. 1).

(Figure I)

Processing key technology: ①, vacuum processing, the electrode is completely impregnated in the solution sealed vacuum, vacuum hold after re-pressure, electrode internal due to the role of pressure difference, will suck the solution into the electrode body breath, to ensure the dense electrode; ②, to ensure a certain amount of time for the electrode air dry, to prevent the use of liquid precipitation affect the copper tile conductivity; ③, the electrode head to do a good job of protection, the joint shall not have solution. Otherwise, it will affect the conductive effect.

4. Use effect evaluation

The first stage: blank test, using for impregnated electrode for measurement; the total weight of electrode consumed in the process: 6860.7kg, the total electricity consumed in the process: 522,400 tons of degrees; not through the oxidation treatment of 10,000 degrees of electricity electrode consumption: 131.33kg / 10,000 degrees.

The second stage:measured by using antioxidant treatment electrode; the total weight of electrode consumed in the process of measurement: 4518.4kg; the total electricity consumed in its process: 397.8 thousand kilowatt-hour; so the consumption of 10,000 kilowatt-hour electrode after passing antioxidant treatment: 113.5847kg/10,000 kilowatt-hour.

So it is concluded that antioxidant treatment saves comparison: from 131.33kg/10,000 kWh before to 113.5847kg/10,000 kWh, the reduction ratio reaches 13.512%.