LRF Ladle Refining Furnace
The LRF Ladle Refining Furnace is a device that refines in a ladle after tapping into an electric furnace or a converter.
LF ladle refining furnace consists of the ladle, furnace cover, electrode heating system, and argon stirring system.
The molten steel is stirred by blowing argon gas through the permeable brick installed at the bottom of the ladle to complete the reaction between steel and slag.
The function of the furnace cover is to close the refining chamber to maintain the reducing atmosphere.
Three-phase electrodes are used to make slag and increase the temperature of molten steel by arc heating, and a sliding nozzle is installed at the bottom of the ladle for pouring.
The arc heating system used in the LRF ladle refining is the same as the steelmaking electric arc furnace. The arc generated between the three graphite electrodes and the slag molten steel is used as the heat source.
The heating equipment is basically the same as the electric furnace. The difference is that there is no melting process in the LF furnace.
Moreover, the ambush heating method is used, so compared with the electric furnace, a lower secondary voltage and the smallest polar center circle can be used, and the submerged arc heating method has a protective effect on the furnace lining due to the small radiant heat.
At the same time, the thermal efficiency of heating is relatively high, and the heat utilization rate is good.
The secondary side of the transformer used in the LRF ladle refining furnace is usually divided into several levels of voltage, but it is not necessary to carry out on-load regulation, so the equipment is relatively simple and the reliability is good.
When the LF ladle refining furnace is refining, the molten steel level is relatively stable, the current fluctuation is small, and there is no short-circuit impulse current caused by the collapse of the material when the electric furnace melts the charge, so the current density can be selected to be larger.
The adjustment system of the LRF ladle refining furnace must have a high-sensitivity automatic adjustment system to reduce and prevent the carbon increase caused by the contact between the electrode and the molten steel.
The LRF ladle refining furnace has the functions of arc heating under normal pressure, bottom blowing argon stirring, temperature measurement and sampling, fine-tuning of alloy composition, deoxidation, desulfurization, and removal of impurities, so as to obtain molten steel with high purity.
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