slag metal separation in the blast furnace trough
Blast Furnace Control using Slag Viscosities and Liquidus
blast furnace slag compositions and higher target viscosities the resulting temperature is likely to yield a multiphase slag where the solids contribute tapping but not so low as to impede physical separation of slag and metal in the trough. • Below target viscosity.
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Slag is less dense than iron so it floats on the surface. In a blast furnace the hot metal comes out of the tap hole in the side of the furnace and goes down a trough or runner.
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Such a slag acquires liquid mobility and trickles down the furnace away from the site where it starts distorting plastically as soon as possible. This action exposes fresh sites for further reaction and is supposedly responsible for enhanced slag-metal reaction rates influencing the blast furnace operations and the quality of the metal.
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Slag level on the opposite side of the tap hole is higher than at the tap hole and the mass of slag presses the hot metal surface below the level of the tap hole. Both hot metal and slag flow out through the tap hole until the slag level is so low that also gas can burst out. The tap hole is closed with a mud gun and the casting is over.
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The hot metal and slag separate in the trough while flowing to the skimmer due to the difference in density of the iron (approximately 7.9 g/cm3) and slag (approximately 2 g/cm3).
Get PriceGround granulated blast-furnace slagWikipedia
Ground-granulated blast-furnace slag (GGBS or GGBFS) is obtained by quenching molten iron slag (a by-product of iron and steel-making) from a blast furnace in water or steam to produce a glassy granular product that is then dried and ground into a fine powder.Ground-granulated blast furnace slag is highly cementitious and high in CSH (calcium silicate hydrates) which is a strength enhancing
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May 01 2018 · Metal enters the furnace slag in the form of a film on CO-bubbles originating from carbon oxidation and in the form of droplets during oxygen blowing. The entrained metal content in the slag can be at least 10 of the metal mass during oxygen blowing of the bath. Gravity lets the metal droplets settle down from the slag in the metal phase.
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Jun 06 2014 · For the blast furnace tap holes where iron and slag are tapped periodically ready for use taphole mixes (also called taphole clay) are used to plug the hole at the end of a cast. These heat setting materials are then drilled for the next cast.
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Slag-metal Separation in the Blast Furnace Trough. Article. Jan 1998 ISIJ INT An investigation of reactions involving blast furnace hot metal slag and gas at equilibrium was carried out
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In the Cast House Hot Metal slag are tapped from the Furnace tap hole and after flowing through a system of refractory lined troughs / runners flow into Hot Metal Ladles / Torpedoes Slag Pots placed on the iron slag side respectively of the Furnace. iii) Stoves Stoves heat the air blast provided by Turbo Blowers to the Blast Furnaces
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The complete separation of hot metal from slag is expected in the main trough of a blast furnace. However in practice slag may take some hot metals away when it goes through the slag port.
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Liquid phase separation plays a central role in a variety of production technologies 1 is important to reduce metal losses associated with the slag in the main trough of the blast furnace 2 3 sufficient separation gives rise to technological problems in the subsequent processing of hot metal and slag in addition to the losses themselves.
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Slag-metal Separation in the Blast Furnace Trough. Article. Jan 1998 ISIJ INT An investigation of reactions involving blast furnace hot metal slag and gas at equilibrium was carried out
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A critical operation of the steelmaking process is the tapping of the blast furnace into the main troughw hose the main function is to separate the slag from cast iron and feed the refinement operation with a clean metal. And although that operationis a critical step of the steel making process a few papers itdealing with is available.
Get PriceMetal losses in pyrometallurgical operationsA review
May 01 2018 · Metal enters the furnace slag in the form of a film on CO-bubbles originating from carbon oxidation and in the form of droplets during oxygen blowing. The entrained metal content in the slag can be at least 10 of the metal mass during oxygen blowing of the bath. Gravity lets the metal droplets settle down from the slag in the metal phase.
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Considering the hot metal discharge rate of 4.5THM/min and hot metal/slag minimum separation time of 7mins the main trough should have a hot metal holding capacity of 32THM. Considering the specific gravity of hot metal as 6.9T/m3 the minimum volume of hot metal that should reside inside the main trough before Skimmer Block is 4.64m3.
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USA US06/407 035 USA USA US A US A US A US A US A US A US A US A US A Authority US United States Prior art keywords trough molten metal slag receiver inductor Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.
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The iron removal consisted of a large trench called a trough that sloped downward from the front of the furnace into the sand filled cast house floor. It then spilt into two runner systems. A main runner on each system ran parallel with the length of the cast house. As this runner sloped downhill a series of dams were made at regular intervals.
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The hot metal and slag separate in the trough while flowing to the skimmer due to the difference in density of the iron (approximately 7.9 g/cm3) and slag (approximately 2 g/cm3).
Get PriceHandling of Hot Metal in Blast Furnace Iron MakingIspatGuru
The iron removal consisted of a large trench called a trough that sloped downward from the front of the furnace into the sand filled cast house floor. It then spilt into two runner systems. A main runner on each system ran parallel with the length of the cast house. As this runner sloped downhill a series of dams were made at regular intervals.
Get PriceStructural aspects of blast furnace slag
In a blast furnace the flow phenomenon of the slag as dictated by its viscosity greatly influences the heat transfer mass transfer and chemical reactions between the slag and the metal. The blast furnace slag should be a free-flowing one at the operating temperatures to ensure efficient slag–metal separation. It must have appreciable
Get PriceImproving the efficiency of slag and pig iron separation
Improving the efficiency of slag and pig iron separation in the main trough of a blast furnace. V. T. Lobachev I. I. Shestopalov V. M. Minaev G. M. Vertsman Yu. V. Anishchenko Metallurgist volume 28 pages 230232 (1984)Cite this article
Get PriceStructural aspects of blast furnace slag
In a blast furnace the flow phenomenon of the slag as dictated by its viscosity greatly influences the heat transfer mass transfer and chemical reactions between the slag and the metal. The blast furnace slag should be a free-flowing one at the operating temperatures to ensure efficient slag–metal separation. It must have appreciable
Get PriceImproving the efficiency of slag and pig iron separation
Improving the efficiency of slag and pig iron separation in the main trough of a blast furnace. V. T. Lobachev I. I. Shestopalov V. M. Minaev G. M. Vertsman Yu. V. Anishchenko Metallurgist volume 28 pages 230232 (1984)Cite this article
Get Price(PDF) Optimal configuration of blast furnace slag runner
The complete separation of hot metal from slag is expected in the main trough of a blast furnace. However in practice slag may take some hot metals away when it goes through the slag port.
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material which gets collected in the hearth and blast furnace gases come out of blast furnace from the top. ii) Cast House In the Cast House Hot Metal slag are tapped from the Furnace tap hole and Hot metal and slag are separated in the refractory lined main iron trough. Hot metal is led to hot metal ladles/torpedoes (placed below the cast
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