Blast furnace is used to reduce the iron ore to iron. The model further utilized for the heat transfer analysis of different thickness of lining materials. SiC- Si3N4 brick – There are many different types of SiC brick with different bonding systems and varying SiC content. The brick is composed of high quality mullite and high purity fused corundum as raw materials with addition of specified binder by shaping at high pressure and sintering at high temperature. blast furnace refractory lining. Furnace Refractories . To achieve a desired lifetime, the temperature of the lining in these areas thereby proved to be the decisive controllable parameter. The stack bricks are particularly exposed to high abrasion and erosion by charge material from top as well as high velocity fume and dust particles going out due to high blast pressure in a CO (carbon mono oxide) environment. Heat Mass Transfer 51(1-2), 186– 197 (2008). Refractory lining can protect furnace shell and other metal … The refractory wall lining typically measures two feet or more in thickness and contains more than 2,500 tons of refractories. The products from mini blast furnaces are of the same quality as that of normal Blast Furnaces and are free of tramp elements - this is of particular advantage in steel making in mini steel plants. Refractory lining system design – The entire refractory lining is also subjected to thermal stress which also plays a dominant role especially when the design is inadequate. The iron lining is lined with periodic slag, molten iron scouring and corrosion, the iron sump is one of the areas where refractory material is consumed in blast furnace production. Longer running times and shorter down-times for new linings or repairs mean that specific solutions are required increasingly often for the refractory lining of blast furnace stacks and runner systems. Our refractory products have been sold to more than 60 countries around the world, such as Malaysia, South Africa, India, Indonesia, Pakistan, Netherlands, Kuwait, Kenya, Russia, United States, etc. Blast Furnace HarbisonWalker International Refractory . Carbon refractory ramming material is used between the centerline of the furnace bottom water-cooled pipe and the first layer of fully covered carbon brick. Blast Furnace - An Introduction. But, to the machining of many electric furnace carbon blocks is relatively simple. The organic materials and production procedure flow of carbon blocks paving in electrical furnace are typically the same as carbon blocks lining in blast furnace. They are generally composed of a mixture of bauxite, flint clay/chamotte and plastic clay. The whole body is encased in a metal shell. When the change reaches the limit what refractory lining material can resist, the furnace lining will be damaged. The goal of reducing erosion rate and longevity of blast furnace can be achieved. Normal refractories have a fusion temperature of 1580 ~ 1780 °C (e.g. They are also finding more applications in blast furnace linings, although this use is still rare. Blast Furnace Ancillary Equipment- Stoves, Bustle Pipe, Tuyeres Current Refractory Materials High Alumina Brick Lining. Induction furnaces are used for melting cast iron, mild steel and various alloy steels in foundries and making of steel in mini steel plants using sponge iron. google_ad_client = "ca-pub-7057920448327527"; Refractory lining of blast furnace – IspatGuru. High temperature and thermal shock In the melting process of blast furnace, there will be a large change in high temperature and heat conductivity. Moulded micro porous carbon silicon carbide bricks can be used for the brickwork of tuyere, slag hole, tap hole, the hearth and the slag forming zones of the blast furnace. Different types of refractories which are used in blast furnace lining are described below. Blast furnaces reduce iron ore through a process combining coke and limestone. The furnace belly, furnace waist, and lower part of the furnace body are inlaid with silicon carbide bricks combined with silicon nitride. Enquiry Information. At the same time, it supports the refractory brick lining of the furnace belly. Micro porous carbon silicon blocks are used in laying the hearth, tap hole and slag hole of the blast furnace. The charge, which consists of iron ore, coke and limestone etc. Furnace performance is directly related to the performance of its lining. The cooling of refractory lining can be done by stave cooler. This is a hot blast process whereby hot preheated gases from the blast furnace … Refractory Materials Used In Blast Furnace, Refractory Materials Used In Non Coke Iron Smelting, Development of Refractory Materials for Ladle Lining, The Characteristics of Refractory Materials for…, Rongsheng Refractory Cement for Sale in Philippines. 80 % alumina class bricks – These are based on bauxite with additions of calcined alumina and clay materials. The refractory lining system or design must (i) optimize thermal resistance, (ii) provide expansion relief, (iii) prevent cracking, and (iv) eliminate built-in barriers. google_ad_height = 250; A modern blast furnace (BF) is refractory lined to protect the furnace shell from the high temperatures and abrasive materials inside the furnace. blast furnace refractory lining. The monitoring system of the firebrick lining state of the blast furnace devil is offered. A thin furnace lining structure with an integrated refractory brick wall is adopted, and the lining of cast iron cooling plate refractory brick is integrated with the cooling wall by cold setting. Baked carbon blocks – Micro porous carbon block, semi graphitic carbon block, and micro porous carbon silicon block are made with high temperature electrically calcined anthracite, synthetic graphite and silicon carbide as main raw materials. The refractory lining with stave 3D model in blast furnace is analyzed and design by using the ANSYS software. These bricks are fired to around 1400 deg C to prevent excessive expansion during firing (caused by a reaction of siliceous ingredients with bauxite, forming mullite). eRefractories for Blast Furnace 9 Blast furnace SANAC started the production of refractories for blast furnaces since 1957. /* 300x250, created 1/18/11 */ There are diverse physical and chemical wear mechanisms in the different regions of the blast furnace and they are complex in nature. 15 Aug 2014 A modern blast furnace (BF) is refractory lined to protect the furnace shell from the high temperatures and abrasive materials inside the furnace. As we all know, carbon refractory materials, such as carbon bricks, have the characteristics of high thermal conductivity, strong slag resistance, high-temperature strength, and good thermal shock resistance.In addition, it has the advantages of large-scale. When choosing refractory brick used for different lining parts of blast furnace, we should follow some principles. Therefore, according to the different working conditions of different parts of the blast furnace, the selection of refractory lining for blast furnace used in each part is as follows. The refractory lining with stave 3D model in blast furnace is analyzed and design by using the ANSYS software. The refractory lining is cooled to further enhance the protection against the dispatch of excess heat that can destroy the refractory lining. In the hearth region, horizontal and vertical flow of hot metal combined with thermal stresses often form undesirable elephant foot shaped cavitation. Refractory Lining Of Blast Furnace During the production of blast furnace, series of severe physical and chemical reactions are taking place.These reaction cause serious corrosion to refractory lining, particularly when these erosion occur under the high temperature or violent temperature fluctuations. Customers benefit from the unsurpassed experience and know-how that both companies have developed in the field of hot blast stove engineering, refractory lining design, and hot … A fire brick, firebrick, or refractory brick is a block of refractory ceramic material used in lining furnaces, kilns, Manufacture. Blast Furnace is generally refractory lined with ceramics materials such as fireclay bricks and high alumina bricks and carbon materials such as carbon brick and carbon graphite. The application condition of different regions of a blast furnace is not the same due to the very nature of its geometry and also due to the pyrometallurgical process occurring at different stages. The ceramic is beneficial to the heat preservation of the hearth slag and is conducive to saving the coke ratio and active hearth. How to Choose Refractory Lining for Blast Furnace? The mud used to block the iron outlet is squeezed in by a mud gun, so it is also called gun mud. >=60wt% SiC. Induction Furnace Refractory Lining with Silica Ramming Mass. Blast Furnace is the focus of any integrated steel plant. Maharashtra Elektrosmelt. But the service life is still short, so it is also protected by wear-resistant and impact-resistant cast steel bricks. The products from mini blast furnaces are of the same quality as that of normal Blast Furnaces and are free of tramp elements - this is of particular advantage in steel making in mini steel plants. Modern blast furnace ironmaking is reformed and developed by the ancient shaft furnace ironmaking method. Lining is the important part of induction furnace. In general, direct bonded SiC have high resistance to alkalis and zinc. Alibaba.com offers 274 refractory lining in blast furnace products. Refractory systems for blast furnaces and pig iron transport STEULER-KCHIRON & STEEL2 Transfer ladles / hot metal ladles / teeming ladles For the past several decades, STEULER-KCH has been providing back-up lining materials ranging from simple insulating fireclay brick to high-quality permanent lining with emergency operating properties. Enter your e-mail address and your password. So it requires a refractory lining which should have high strength, lower creep in compression value and higher RUL (refractoriness under load) and PCE (pyrometric cone equivalent) values. The refractory lining of every part should fit the parts thermal current intensity, so that the lining can maintain previous vertebral shape and stability under the impact of strong heat flux. Operational factors such as (i) high productivity leading to high heat loads, (ii) high fluid velocity that causing more erosion and (iii) high coal injection means lower permeability. This model is used for analysis the effect of refractory lining thickness with different cooling rate. The refractory wall lining typically measures two feet or more in thickness and contains more than 2,500 tons of refractories. The working lining of the refractory materials working layer of the tapping pit is repeatedly and frequently subjected to erosion, abrasion and corrosion by high temperature molten iron and slag. Therefore, according to the different working conditions of different parts of the blast furnace, the selection of refractory lining for blast furnace used in each part is as follows. (1) Furnace bottom, hearth, taphole area, and tuyere belt. The refractory lining of the section is even more corroded, becoming the largest part of the refractory consumption of blast furnace ironmaking. An improper selection of the refractories often leads to a refractory failure which, subsequently, becomes a complex problem to solve. Most refractory materials consist of particles bonded together that have high melting temperatures. Blast furnaces reduce iron ore through a … the field of hot blast stove engineering, refractory lining design, and hot metal production. Some BFs use low iron, dense 42 % -62 % alumina, mullite refractory bricks, conventional carbon blocks etc. The paper applies tribological principles to the study of blast furnaces lining destruction processes. Originally, Paul Wurth Refractory & Engineering GmbH has been founded as DME in 1993 through the merger of departments of Didier-Werke AG and Martin & Pagenstecher GmbH. Spraying materials with strong CO corrosion resistance and high thermal flexural strength. We doesn't provide blast furnace refractory lining products or service, please contact them directly and verify their companies info carefully. This area is mainly affected by direct impact and friction from blast furnace incoming materials. Fire clay) 60 % alumina class bricks – Bricks in this class are composed of a wide variety of materials. Types of refractory lining required in a blast furnace region wise as well as the trend in the refractory lining pattern is given in the Fig 1. The blast furnace is a refractory-lined circular shaft 100 to 200 feet high, with an internal diameter between 20 and 45 feet. 0.02-0.03 % 0.05 – 2 % Energy-Input O 2 O 2, Gas, el. Generally, adopt high alumina bricks, fireclay bricks and common carbon brick to build blast furnace lining, which results the short furnace life.. Refractories used in blast furnace mainly include carbon brick, alumina silica refractory and etc. There are four main factors that affect the campaign life of a blast furnace: 1) blast furnace design, 2) refractory quality and reliability, 3) refractory lining quality and tightness, 4) amount of care and attention paid to maintaining the furnace lining. Slag is any part of an ore that isn't metal. 70 % alumina class bricks – This class of bricks is based on primary raw materials bauxite or high alumina chamotte which is added with fireclay. Based on fusion temperature. The refractory lining with stave 3D model in blast furnace is analyzed and design by using the ANSYS software. Refractory lining of a furnace arch (BEE, 2005) Figure 2b. Paul Wurth Refractory & Engineering GmbH is always striving for world class stove and refractory designs to meet demanding market requirements, such as larger production capacity, extended ser-vice life, optimized refractory selection, and high 50 % alumina bricks usually have low porosity, expand upon reheating to 1600 deg C and have good resistance to thermal cycling. we will discuss the types of refractory lining required in a blast furnace area wise as well as the trend in the refractory lining pattern that has been observed during the last few years. This model is used for analysis the effect of refractory lining thickness with different cooling rate. Micro porous alumina carbon brick – These bricks are made by adopting special grade bauxite clinker, corundum, graphite and mid alumina as main raw materials, combined with several kinds of super fine powder additives. The campaign life duration of a blast furnace is mainly determined by the condition of the refractory lining in heavy-duty zones such as the hearth, bosh, belly and lower stack. Because the temperature of this part is not high, about 400~500℃, the refractory materials used are mostly dense clay bricks, high alumina bricks, and sillimanite bricks. The first, second, and third layers are covered with semi-graphite carbon blocks, and the fourth layer is covered with microporous carbon bricks. The brick is characterized by good alkaline resistance and slag corrosion resistance, which is suitable for lining the bottom, hearth ceramic cup, tuyere, tap hole and slag hole. Refractory lining of blast furnace – IspatGuru. Selection of refractory bricks for blast furnace taphole and taphole. The bottom of the blast furnace, the hearth, is lined with multiple layers of carbon brick. Micro porous carbon blocks are used as the linings of the upper bottom and lower hearth of blast furnaces with intensified smelting. We doesn't provide blast furnace refractory lining products or service, please contact them directly and verify their companies info carefully. The temperature gradients in the system and the properties of all materials must be considered. The hot blast furnace masonry will shrink and cause crack under the function of mechanical and high temperature thermal shock action, which will affect the service life of the hot blast furnace greatly. Selection of appropriate refractory combination depending on the wear mechanism is very important. Moreover, our experienced technical engineers of refractory materials always pay attention to the development of refractory materials and customize refractory products for customers’ refractory linings. Other 60 % alumina qualities in this class are composed of a mixture of synthetic chamotte, bauxites, calcined alumina and plastic clays. Sillimanite bricks can be often phosphate/chemically bonded and cured as a means of improving thermal shock resistance. BF hearth life mainly depends on the following factors. The heat-resistant castable is used below the furnace bottom water-cooling pipe centerline to the elevation of the heat-resistant foundation pier top. The vault is not connected with the lining of the hot blast stove wall, and the whole is supported by a metal bracket supported by the inner wall of the furnace shell. The refractory lining of the section is even more corroded, becoming the largest part of the refractory consumption of blast furnace ironmaking. Simply to be cut flat the two ends, for … The design of this ‘ceramic cup’ is important, as the isotherms are altered depending on the quality and thickness of the cup material. High levels of mullite formation allow bricks in this class (especially sillimanite containing refractories) to exhibit excellent creep resistance. Also, they have high thermal conductivity, excellent erosion resistance, very good thermal shock properties, and are resistant to corrosion and CO attack. Generally, adopt high alumina bricks, fireclay bricks and common carbon brick to build blast furnace lining, which results the short furnace life. This model is used for analysis the effect of refractory lining thickness with different cooling rate. Is High Alumina Refractory Mortar the Same as High Alumina Cement? Refractory bricks in these areas are subjected to high load and temperature. The campaign life duration of a blast furnace is mainly determined by the condition of the refractory lining in heavy-duty zones such as the hearth, bosh, belly and lower stack. Junger & Grater. Your Email (required) Fig: Blast Furnace Temperature Zones . It is well known that in the last ten years this sector has considerably developed. tuyere, bosh, belly and lower stack, silicon carbide, SiC-Si3N4 and corundum refractories have replaced carbon and 62 % Al2O3 or mullite bricks. (5) Between the cooling stave and the furnace shell. Details are given in Tab 1. The model further utilized for the heat transfer analysis of different thickness of lining materials. Power Refractory lining basic acid - basic Liquid pig iron The production practice of the steel mill proves that this design structure can fully meet the normal service life of the blast furnace for 12-15 years. Metals melt at a reasonably high temperature. There are also carbon bricks and ultra-microporous carbon bricks, the bottom of the furnace is made of two layers of ceramic pads, and the hearth is made of ceramic walls. 2019 New Design Blast Furnace Clay Fire Brick For Lining Fire brick . J. Create your account. google_ad_width = 300; The most common and highly regarded mid alumina bricks are composed of minerals from the sillimanite group (usually combined with small amounts of calcined alumina and plastic clays). The Characteristics of Refractory Materials for Hazardous Waste Rotary Kilns, The Effect of Cement Addition on the Performance of Ladle Porous Plugs and Well Blocks. for complete blast furnace plants. The charge, which consists of iron ore, coke and limestone etc. With features of high refractoriness under load (RUL), compact structure, low porosity and high resistance to corrosion, the bricks are used for the BF bottom, ceramic cup bottom lining and combined brick of tuyere, tap hole and slag hole of the large blast furnace. About 89% of these are refractory. Rongsheng is a refractory manufacturer with more than ten years of production and sales experience. To achieve a desired lifetime, the temperature of the lining in these areas thereby proved to be the decisive controllable parameter. The blast furnace is a refractory-lined circular shaft 100 to 200 feet high, with an internal diameter between 20 and 45 feet. Super duty fireclay refractory brick or dense alumina brick having Al2O3 around 39 % – 42 % can impart these characteristics required for stack application. If your blast furnace needs refractory bricks or refractory castables. Refractory linings build the service space for blast furnace to directly resist mechanical, high temperature and chemical erosion in the manufacturing process and insulate the furnace heat. Fig: Blast Furnace Temperature Zones . Service property for refractory is the key effect on the life of blast furnace. The application condition of different sections of a blast furnace is different due to the very nature of its geometry and also pyrometallurgical process occurring at different stages (see adjacent Blast Furnace figures). Refractory properties – These include (i) High thermal conductivity, (ii) alkali resistance, (iii) low permeability, (iv) low thermal expansion, and (v) low elasticity. RS baking-free ramming mass . Refractory Lining of Palletization Plant at Madovi Pallets Ltd. The development of longevity technology in the hearth and hearth bottom has gone through a long process. Required Products (required) Blast furnace is used to reduce the iron ore to iron. How to choose refractory lining for blast furnace? Semi graphitic carbon blocks are used as the lower bottom lining. 1,2 1. Presently the campaign life of a BF is expected to be around 15 years or more. A wide variety of refractory lining in blast furnace options are available to you, such as powder, brick. The refractory wall lining typically measures two feet or more in thickness and contains more than 2,500 tons of refractories. The blast furnace process has been the primary method for producing iron for many decades. Your Name (required) The refractory lining's properties are enhanced through cooling to protect the refractory lining from excess heat. The carbon refractories are covered by fireclay or mullite bricks to protect it against oxidation. The problem of brittle layer formation around 800 deg C isotherm by alkali condensation and thermal stresses have been addressed to by using smaller blocks, optimum expansion allowances etc. All blast furnace refractory lining wholesalers & blast furnace refractory lining manufacturers come from members. Fig: Typical areas of a Blast Furnace . Please contact us. The blast furnace mud shall have a sufficiently high refractoriness, and shall have the following properties: (1) The plasticity and adhesiveness are better, and it is easy to squeeze into and fill the gaps and cracks. Its anti-slag iron corrosion and thermal shock resistance are good, the overall performance is good, and it has good protection for the tuyere-cooler casings. Fig: Typical areas of a Blast Furnace . With BF lifetimes extending to 20 years and beyond, it becomes increasingly important that the correct choice is made for the lining design. Iron Making, Blast Furnace Lining Increase in Blast Furnace lifetime, offers significant cost reduction of operations.
2020 refractory lining in blast furnace