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            Ladle Refining Furnace

            DETAILS

             Description:

            MOST ADVANCED TECHNOLOGIES OF LF FURNACE 
            Single-electrode D.C powering LF ladle furnace
            Three-electrode D.C powering LF ladle furnace
            Single-electrode arm A.C powering LF ladle furnace
            Tubular water-cooled roof
            Microcomputer controller-hydraulic electrode regulator
            VVVF-motor type electrode regulator

            Main Technical Parameters: ( Technical specifications of LF,VOD,VD,type furnaces)

            Rated capacity t

            Ladle diameter MM

            Transformer rated capacity KVA

            Electrode diameter MM

            Electrode pitch circle diameter MM

            Heating-up rate C/min

            Vacuum pumping rate Kg/h

            Vacuum vessel mm

            Ultimate vacuum Pa

            Ladle weight t

            Actual capacity t

            20
            15-20

            2200

            3150

            200

            500

            2-3

            150

            2800/4100

            67

            18

            40
            30-40

            2900

            6300

            350

            850

            2-3

            250

            4800/5000

            67

            25

            60
            50-60

            3100

            10000

            350

            650

            2-3.5

            360

            5300/5500

            67

            39

            70
            70-80

            3200

            12500

            400

            700

            2-3.5

            380

            5400/5600

            67

            43

            100
            90-100

            3400

            18000

            400

            700

            2-3.5

            400

            5500/5800

            67

            47

            150
            100-150

            3900

            20000

            450

            800

            2-3.5

            450

            6300/6600

            67

            52


            Product Specification
            Ladle Refining of liquid metal is a proven technology to produce high quality steel. LRF is used to raise the temperature and adjust the chemical composition of molten metal.


            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 refining with conventional ladles. Costs of extended furnace time, refractory wear and power/fuel consumption can all be reduced using LRFs to perform holding and refining.

            Reduced scrap melting capacity in Basic Oxygen Furnaces (BOF) is another disadvantage of higher tap temperatures. The LRFs also acts as a buffer between the Steel Making Furnace (BOF) or the Electric Arc Furnace (EAF) and the continuous caster, reducing casting costs and allowing greater flexibility in steel making operations.

            Process

            Ladle Refining Furnaces are used for the following refining processes:

            Homogenisation : Temperature and composition are equalized by stirring.

            Inclusion Flotation : Non-metallic inclusions can be removed by gentle stirring of the metal. Oxygen levels of 30 parts million (ppm) have been obtained.

            Desulphurisation : Synthetic slags can desulphurise from 0.025% to less than 0.015% in about forty minutes. Desulphurisation can also be accomplished by injection of CaSi or fluxes. Generally, 15 kg per ton of a CaO-Al2O3 slag is used.

            Vacuum degassing: Hydrogen content can be reduced to 3 ppm.

            By providing a mean to refine outside of the steel making furnace, LRFs provide many benefits including reduced alloy consumption, uniform temperature & properties and lower energy costs while increasing overall plant productivity. In addition, a vacuum environment can be attained in LRFs, which allows production of highly refined steels.

            DC LRF offers following advantages over similar capacity conventional AC LRF:
            1. Less specific power consumption.
            2. Lower cost of operation and maintenance.
            3. Reduced refractory consumption.
            4. Better thermal efficiency.
            5. Lesser power requirement compared to conventional LRF.
            6. No line flickering.
            7. It can also be operated with a weak grid.
            8. Small heat size can be treated economically.

            Attributes
            Special attributes of Electrotherm LRF
            Homogenisation: Temperature and composition are equalized by stirring.

            Inclusion Flotation: Non-metallic inclusions can be removed by gentle stirring of the metal. Oxygen levels of 30 parts million (ppm) have been obtained.

            Desulphurisation: Synthetic slags can desulphurise from 0.025% to less than 0.015% in about forty minutes. Desulphurisation can also be accomplished by injection of CaSi or fluxes. Generally, 15 kg per ton of a CaO-Al2O3 slag is used.

            Vacuum degassing: Hydrogen content can be reduced to 3 ppm.

            Grain re-structuring of Sulphides and Oxides.

            Principles of D.C. Plasma LRF Operation
            1. Main objectives of LRF are homogenization of chemical composition & temperature of steel, desulphurisation, removal of inclusions, lowering gas contents, adjusting temperature for tapping and to carry out trimming.
            2. The DC Plasma Ladle Furnace operates in the same way as the conventional ladle furnace, but with following differences.
              Argon plasma in place of Air plasma
             
              
            Operation with captive power plant
             
              
            Easy operation as power supply is short circuit proof
             
              
            There are only two electrodes
            3. Argon injection through drilled graphite electrodes can minimizes arc flare and allows more flexibility in ladle furnace operation.
            4. The argon plasma helps to maintain inert atmosphere above the melt decreasing nitrogen, oxygen and hydrogen pick-up.
            5. The arc is stable and has a tendency to remain within the concavity around the electrode hole because of the high temperature, thereby reducing radiation loss to the roof and freeboard.
            6. Carbon pick up from the electrode can also be decreased, since argon injection provides an extended arc due to the flow resistivity of the argon plasma and low consumption of electrodes.
            7. Heating efficiency and ladle refractory life is significantly increased.
            8. Use of DC Plasma decreases operational costs due to lower graphite consumption, savings in ferroalloys and power consumption


            50t Ladle Refining Furnace (LF)

            Refining Furnace

            Tel: +86-411-62885583
            Email: sales@cimmuk.com
            Address: 2/F, Zhiye Plaza, 135 Guangxian Road, Dalian High-Tech Industrial Zone, Dalian, Liaoning, China 116023
            Skype: Mark Ma
            WhatsApp: +8618624286999
            Mobile(UK): +44 7398713688
            Wechat: ArkofChina999
             
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