Blast furnace hearth refractory and coke ash mineral
Abstract. In the blast furnace hearth the calcium aluminate by-products of coke dissolution can react with the hearth refractories. Reactions between these coke ash minerals and the aluminosilicate and alumina-carbon hearth refractories may result in increased refractory wear reducing the blast furnace
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Importance of Hearth Dead man and Tapping in Blast
Apr 13 2016 · Blast furnace hearth and dead man. The state of the hearth plays the most important role for stable furnace operation and long campaign life. This lowest region in the blast furnace is exposed to liquid iron (hot metal) and liquid slag which are in direct contact with the refractory materials causing severe erosion and chemical and thermal
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Blast Furnace Coke Properties andDiVA portal
additional slag former to melt the coke ash which demands extra energy and increases the slag volume. Alkalis in coke ash are usually present as silicates and are the largest source of alkalis in blast furnace burden as much as 75 of alkali input comes from coke. 3
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Analysis of the Deadman Features in Hearth Based on Blast
The blast furnace hearth was filled with coke. At the height of about 912 mm below the taphole centerline the hearth was mostly consisted of coke and hot metal and the Fig. 1. Schematic view of the designed blast furnace. Fig. 2. Pieces of hearth deadman cut by rope saw. (Online version in color.)
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Existence state and structures of extracted coke and
Aug 01 2018 · Due to the improvement of coke pore size blast furnace melts (bosh slag or molten coke/coal ash) can migrate into the coke matrix through those connected open pores. Coke carrying slag in its inner pores may enter the iron bath of the BF hearth which might affect coke dissolution into hot metal and degrade the refractory of the hearth bottom.
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Study on the Influence Factor of Coke Pulverization Rate
Mar 17 2020 · Analysis of the production data of 5BF blast furnace of Meishan Steel showed that under the conditions of coke ash (A d) < 12.2 M 10 < 6.5 M 40 > 87 CRI < 26 and CSR > 66 the CPR would be less than 23 which is conductive to ensure stable permeability large blast furnace.
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Phillip DrainProject Manager decarbonisation and Water
The interactions between the coke ash minerals and aluminosilicate hearth refractory have been assessed by heating samples of calcium aluminates (CA CA2 CA6) coupled with aluminosilicate refractory to temperatures representative of the blast furnace hearth (1450°C to 1550°C) in an inert atmosphere over a range of reaction times (424 hours).
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Analysis of Blast Furnace Hearth Sidewall Erosion and
3) CSIRO Mineral Resources Private bag 10 Clayton South Victoria 3169 Australia. (Received on April 3 2016 accepted on July 1 2016) The blast furnace campaign life is largely determined by the damage to the hearth area. Bricks and skulls in the hearth were sampled and investigated after the blowing-out of one commercial blast furnace.
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Low Ash Metallurgical Coke (LAM Coke/MET Coke) is solid
content. However the "ash" constituents remain encapsulated in the resultant coke. Typical purities range from 82-92 fixed carbon. The different varieties of metallurgical coke includeBlast Furnace grade Foundry grade Ferro alloy coke Other chemical industries grade The consumption of LAM coke in India is generally indicated in Figure give
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Phase and mineral behavior of coke in cohesive zone
Oct 01 2019 · Additionally with the renewal of hearth coke the coke carrying slag may come into contact with refractories of furnace bottom. If this is the case the coke ash and the slag will react to form new mineral phases which may interact with the aluminosilicate refractories and lead to the erosion and spalling of furnace bottom.
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Factors affecting Coke rate in a Blast FurnaceIspatGuru
Jun 29 2014 · During the production of hot metal in a blast furnace BF coke rate is influenced in many ways. High ash content in BF coke means charging the blast furnace with more slag forming material which is to be fluxed to form slag. This results into higher slag volumes. As per thumb rule 1 reduction in the ash content of the BF coke results into
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Coke (fuel)Wikipedia
Coke is a grey hard and porous fuel with a high carbon content and few impurities made by heating coal or oil in the absence of air—a destructive distillation process. It is an important industrial product used mainly in iron ore smelting but also as a fuel in stoves and forges when air pollution is a concern.. The unqualified term "coke" usually refers to the product derived from low
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Low Ash Metallurgical Coke (LAM Coke/MET Coke) is solid
content. However the "ash" constituents remain encapsulated in the resultant coke. Typical purities range from 82-92 fixed carbon. The different varieties of metallurgical coke includeBlast Furnace grade Foundry grade Ferro alloy coke Other chemical industries grade The consumption of LAM coke in India is generally indicated in Figure give
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Phase and mineral behavior of coke in cohesive zone
Oct 01 2019 · Additionally with the renewal of hearth coke the coke carrying slag may come into contact with refractories of furnace bottom. If this is the case the coke ash and the slag will react to form new mineral phases which may interact with the aluminosilicate refractories and lead to the erosion and spalling of furnace bottom.
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Reactivity of coke ash on alumina-carbon blast furnace
Understanding the degradation of blast furnace hearth refractories by coke ash products is a crucial component in achieving long furnace life. This study has been conducted to determine the reactivity of calcium aluminates (CaO·Al2O3 CaO·2Al2O3 and CaO·6Al2O3) in contact with an alumina-carbon refractory at representative hearth
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University of Wollongong Research Online
This article presents work undertaken at BlueScope Steel s Port Kembla blast furnaces that has related newly available data on the composition and morphology of a coke ash mineral layer that can form as coke is dissolved in the liquid iron the hearth to the deadman state. COKE ASH MINERAL LAYER
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Hearthan overview ScienceDirect Topics
Hearth coke moves slowly in the hearth and is finally fading out while carbon dissolves in hot metal and coke ash in slag. At the same time the hearth coke is renewed by new coke from the active coke zone. Deadman is located inside the hearth coke. Its diameter is about 3 m smaller than the hearth diameter. Deadman can be either active or
Get PriceReactivity of coke ash on aluminosilicate blast furnace
Blast furnace hearth refractories are a key component in achieving long furnace lives. These refractories. can be degraded by among other things reactions with coke ash products. Recent studies have shown. that these coke ash products could be calcium
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Importance of Hearth Dead man and Tapping in Blast
Apr 13 2016 · Blast furnace hearth and dead man. The state of the hearth plays the most important role for stable furnace operation and long campaign life. This lowest region in the blast furnace is exposed to liquid iron (hot metal) and liquid slag which are in direct contact with the refractory materials causing severe erosion and chemical and thermal
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Effect of Alkalis on Ironmaking Process in a Blast Furnace
Mar 27 2020 · Breakage of coke also promotes flooding choking of the hearth and increased burning of tuyeres and slag notch all of which limit furnace output. The tendency for the ascending gas to be transported near the walls increases when the permeability is lowered which decreases the utilization of the gas and thus increases the coke rate.
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Analysis of the Deadman Features in Hearth Based on Blast
A large area of coke called deadman is formed in the low part of ironmaking blast furnace. The recognition of the deadman is significant to the evaluation of the performance for blast furnace. 1) In recent years with the increase of smelting intensity the molten iron flow brings much more heat into the hearth and therefore the hearth refractory is exposed to high temperature iron and
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Oct 15 2019 · Coke samples of cohesive zone were obtained from a medium sized blast furnace with an effective volume of 1050 m 3.The blast furnace was equipped with 21 tuyeres and 2 tapholes and further details of operating conditions and related data can be found in our previous publications .The coke samples were collected manually after the blast furnace cooling down by water quenching and
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"Reactivity of coke ash on alumina-carbon blast furnace
Understanding the degradation of blast furnace hearth refractories by coke ash products is a crucial component in achieving long furnace life. This study has been conducted to determine the reactivity of calcium aluminates (CaO·Al2O3 CaO·2Al2O3 and CaO·6Al2O3) in contact with an alumina-carbon refractory at representative hearth temperatures of 1 450° to 1 550°C.
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Existence state and structures of extracted coke and
Aug 01 2018 · Due to the improvement of coke pore size blast furnace melts (bosh slag or molten coke/coal ash) can migrate into the coke matrix through those connected open pores. Coke carrying slag in its inner pores may enter the iron bath of the BF hearth which might affect coke dissolution into hot metal and degrade the refractory of the hearth bottom.
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Blast furnace hearth refractory and coke ash mineral
Blast furnace hearth refractory and coke ash mineral interactions . Abstract . In the blast furnace hearth the calcium aluminate by-products of coke dissolution can react with the hearth refractories. Reactions between these coke ash minerals and the aluminosilicate and alumina-
Get PriceMichael ChapmanDigital Transformation ManagerIron
In the blast furnace hearth the calcium aluminate by-products of coke dissolution can react with the hearth refractories. Reactions between these coke ash minerals and the aluminosilicate and
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Blast Furnacean overview ScienceDirect Topics
Blast furnaces have grown considerably in size during the twentieth century. In the early days of the twentieth century blast furnaces had a hearth diameter of 4–5 m and were producing around 100 000 THM per year mostly from lump ore and coke. At the end of the twentieth century the biggest blast furnaces had between 14 and 15 m in hearth diameter and were producing 3–4 million tons of
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A. Physical Coke Properties
Coke ash content is also critical to blast furnace operation and hot metal quality. As the total ash increases or varies. The available fuel carbon decreases or varies which negatively affect the amount of energy and reducing gases available. Higher ash also results in a higher amount of slag which requires extra energy to melt.
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FURNACES AND REFRACTORIESModern Eq
Thermal Energy Equipment Furnaces and Refractories Fusion dust and slag or by the action of alkalies on fireclay refractories to form alkali-alumina silicates. This is generally observed in blast furnaces. Reversible thermal expansion Any material expands when heat ed and contracts when cooled.
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