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Ladle Refining Furnaces are a proven technology used for producing alloy steel, desuplhurizing liquid steel and for improving the productivity from a steel plant. Ladle Refining is a post-melting treatment that is after melting in either the Induction Melting Furnace or Electric Arc Furnace
Whenever LRF is installed online, liquid metal is transferred from the main melting source to the LRF at a nominal tapping temperature and either Argon/Nitrogen is purged from the bottom apart from arcing (using electrodes) on the top to bring about homogeneity of liquid metal composition and temperature. Fused lime/CaSi is added to the liquid metal to reduce sulphur and bring it within acceptable limits. And temperature is raised for the next casting operation.
Ladle Refining of liquid metal is a proven technology to produce high quality steel. Ladle Refining Furnaces (LRFs) are used to desulphurise steel, remove other impurities and hold the molten steel for casting operations. Without LRFs, higher tap temperatures are normally required from steel making furnaces due to heat losses during transfer and casting of liquid metal. LRF facilitates higher productive time to the melting furnace besides producing better quality of steel at lower cost.
When alloying is done in the LRF, the main melting furnace is freed from this activity providing more productive time to the melting equipment and this external treatment has a few distinct benefits like reduced alloy consumption, better lining life, excellent homogeneity of chemical composition & temperature and relatively lower energy cost. The normal LRF cycle lasts for about 40-50minutes depending upon the aim and final chemistry and desired temperature rise. Temperature can be raised in the LRF at the rate of 3-4OC per minute depending upon ladle condition and ferroalloy additions that are carried out.
Electrotherm has two different types of Ladle Refining Furnaces to offer viz. AC LRF and DC LRF. AC LRF is the conventional LRF and is recommended for sizes of 15T and above. DC LRF find their application where captive power is used for producing steel viz. Diesel Based Generating Sets, Gas based Generating Sets and power generated from WHRB and/or FBC. And also for smaller heat sizes i.e. 20T and below.
Capacity
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10 T - 25 T - DC Ladle Refining Furnace |
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15 T - 150 T - AC Ladle Refining Furnace |
Ladle Refining of liquid metal is a proven technology to produce high quality steel. Ladle Refining Furnaces (LRFs) are used to desulphurise steel, remove other impurities and hold the molten steel for casting operations. Without LRFs, higher tap temperatures are normally required from steel making furnaces due to heat losses during transfer and casting of liquid metal. LRF facilitates higher productive time to the melting furnace besides producing better quality of steel at lower cost.
By providing a mean to refine outside of the steel making furnace, LRF provides many benefits including reduced alloy consumption, uniform temperature & properties and lower energy costs. In addition, a vacuum environment can be attained in LRF, which allows production of high quality alloy steel.
Attributes
Special attributes of Electrotherm's LRF
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Homogenization : Temperature and composition are equalized by stirring. |
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Inclusion Flotation: Non-metallic inclusions are removed by gentle stirring of the metal. Oxygen levels of 30 particles per million (ppm) can be attained. |
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Desulphurization : Desulphurization is accomplished by injection of CaSi wire and fluxes. Synthetic slag can also be used to desulphurise up to 0.015% in about forty minutes. |
Capacity
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10 MT - 25 MT - DC Ladle Refining Furnace |
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15 MT - 150 MT - AC Ladle Refining Furnace |
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| Copyright © 2008, Electrotherm India Limited. All rights reserved. |
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