1, what are the characteristics of needle coke?
Needle coke is a kind of high quality carbon raw material, divided into coal series and oil series.The focal surface of needle has obvious stripes.When it breaks, most of it is in long, needle-like pieces.The fiber structure can be observed under the microscope, so it is called needle coke.Needle coke tends to graphitize at high temperatures above 2000 degrees.The needle coke graphite electrode has low resistivity, high volume density and low thermal expansion coefficient.It is a necessary raw material for producing ultra-high power electrode and high power electrode.Needle coke is much more expensive than ordinary coke, the current price is about 5-8 times that of ordinary coke.
2. Will the vacuum system on the eAF affect electrode consumption?
The fan used in the dust collection system generates a certain negative pressure during operation, which increases the flow of air around the red-hot electrode during the preparation of steel, thus increasing the oxidation consumption of the electrode.In the process of steelmaking, a good dust removal system not only keeps a good working environment, but also makes electrode consumption stable.
3. How to avoid the increase of electrode consumption in steelmaking process?
In order to avoid the increase of electrode consumption in the process of steelmaking, the following measures should be taken :(1) according to the design requirements of electric furnace, keep good power supply state, power supply within the range of electrode current intensity.(2) Prevent the arc point from immerging into the molten pool.(3) Prevent electrode from immerging in steel liquid to increase carbon.(4) Spray cooling technology should be used for electrodes if conditions permit.(5) Set the correct exhaust system.(6) Use the correct oxygen blowing system.
4. How long does the production cycle of graphite electrode take?
The production process and corresponding time of a batch of ultra-high power or high power graphite electrode are as follows: pressure electrode (3 days) - baking (25 days) - impregnation (4 days) - rebaking (15 days) - graphitization (10 days) - machining, quality inspection (2 days) - finished product packaging and delivery (1 day), I, E.Production lasts up to 60 days from feed to product delivery and 90 days for electrode joints because two soaks and three bakes are required.
5. What are the characteristics of the electrode produced in series graphitization furnace?
The development direction of graphitization furnace is internal heat series graphitization furnace.Because the current density of the connected column is the same, the resistivity difference of the electrode is very small.Second, within the string of graphitizing product on both ends of the resistivity is slightly lower than the middle (acheson graphitization furnace product resistivity is higher than the middle on both ends), beneficial to reduce the resistance of the joint, when users use slow joint overheating aglow phenomenon, make the concatenated graphitizing furnace electrode quality same as acheson furnace, electric arc furnace steelmaking is more suitable for production requirement.