them, slag granulation process by a centrifugal force, which is also called DCG process, has proved its advantages due to its simpleness, controllability, less energy consumption and more sensible heat recovery in the past years.5–9) In this Modeling on Dry Centrifugal Granulation Process of Molten Blast Furnace Slag
Heat recovery from liquid slags in iron and steelmaking has been extensively researched topic, but still commercial solutions do not exist. For example blast furnace slag when cooled from 1500 o C
Aug 09, 2016 · Dry Slag Granulation with Waste Heat Recovery 1. MINERALS DOWN UNDER NATIONAL RESEARCH FLAGSHIP Current Status & Future Direction of CSIRO''s Dry Slag Granulation Process with waste heat recovery ICST 2012, Dresden, Germany: 13 October, 2012 Sharif Jahanshahi and Dongsheng Xie 2.
@article{osti_5610662, title = {Heat recovery in dry granulation of molten blast furnace slag}, author = {Tetsuro, N. and Hiroshi, N. and Koichi, F. and Tsukio, I.}, abstractNote = {In a research and development project undertaken jointly between IshikawajimaHarima Heavy Industries Co. and Sumitomo Metal Industries, Ltd., a process has been developed for granulating molten slag discharged
Dry slag granulation could make a fundamental change in slag treatment. In this new approach, molten slag is atomized under centrifugal forces on a spinning disc, and the droplets generated are quenched and solidified quickly using air, with simultaneous heat recovery.
Waste Heat Recovery from HighTemperature Blast Furnace Slag Particles Waste Heat Recovery, Slag, Granulation, Particles, Gravity Bed Boiler . Introduction . Blast furnace slag is one kind of solid waste, which is discharged from blast furnace. And the temperature of molten slag ranges from 1450 to 1650 ºC. In 2014,
Heat Recovery from Blast Furnace Slag Overall situation: Blast Furnaces in Iron&Steel produce ~400 mio. tons of slag (1500°C) each year The slag is generally processed to a byproduct without using heat recovery (~1,8 GJ wasted energy per ton slag) Increasing demand in Energy
Abstract Blast furnace (BF) slag, which is the main byproduct in the ironmaking process, contains large amounts of sensible heat. To recover the heat, a new waste heatrecovery system—granulating molten BF slag by rotary multinozzles cup atomizer and pyrolyzing printed circuited board with obtained hot BF slag particle—was proposed in this study.
Jan 02, 2019 · We developed a new, integrated dry granulation and heat recovery process which promotes sustainability and full value recovery. Molten slag is atomised under centrifugal forces exerted by a spinning disc to produce droplets which are then quenched and solidified using air to recover the heat.
Granulation of molten slag for heat recovery. field of experimental dry granulating device of blast furnace slag and to research the impact of equipment structure and wind speed on cooling
Heat recovery from hot blast furnace slag granulates by pyrolysis of printed circuit boards Y. L. Qin, X. W. Lv*, G. B. Qiu and C. G. Bai Heat recovery from hot blast furnace (BF) slag is difficult to achieve but has great potential to
Granulating Dryer Introduction Granulating dryer is a steel slag dryer for drying large scale of materials, and it has large production capability, large appliion scope, small flow resistance and convenient operation. Steel slag dryer is widely used in the drying for the sand, river sand, slag, coal cinder, quartz sand, etc.
The molten blast furnace slag (BF slag) is discharged at the temperature of about 14001550 °C, which contains a large amount of heat. At present, water quenching is the main technology to treat the BF slag, but this method not only consumes a huge amount of water, but also fails to recover the waste heat. Compared with water quenching, the dry centrifugal granulation has obvious advantages.
Nov 07, 2013 · for the blast furnace slag energy and as in consequence CO 2 can be saved. In summary dry granulation of blast furnace slag allows an environmental friendly and sustainable subsequent processing for one of the last big heat recovery potentials at a modern blast furnace. [1] References [1] McDonald, I., Long, E., Werner, A.
Liquid slag produced in a blast furnace (BF)is at a temperature of around 1500?C and has a sensible heat of around 400Mcal/ton. BF slag is rich in CaO, SiO2, Al2O3, and MgO which are similar to the components of Portland cement. When this liquid BF slag is cooled fast enough then the solidified slag has a large percentage of glassy phase with high cementations activity and hence it can be used
Heat recovery during slag granulation provides energy recovery of 20 MWth or 6 MWel regarded to a slag mass flow of 1 t/min. springer Siemens VAI wants to build a pilot plant for dry slag granulation for testing the possibility of integrated heat recovery, needing small amounts of liquid slag
Without the need of an upstream drying system for the blast furnace slag energy and as a consequence CO 2 can be saved. In summary dry granulation of blast furnace slag allows an environmental friendly and sustainable subsequent processing for one of the last big heat recovery potentials at a modern blast
May 31, 2019 · The slag that is poured into pits is cooled by air and sprayed water. The slowcooled slag is crushed, sieved, and ground before recovery of valuable metals via floatation, magnetic separation, or leaching. Thus, investment in equipment and heavy machinery is required as well as the operating cost of such equipment/processes.
The slag can also be used to create fibers used as an insulation material called slag wool. Basic slag. Basic slag is a coproduct of steelmaking, and is typically produced either through the blast furnace oxygen converter route or the electric arc furnace ladle furnace route.
SLAG IRON AND STEEL THM : Tonne Hot Metal Blast Furnace Slag In the blast furnace, the slag floating over molten pig iron (hot metal) is flushed out in slag pot and then sent to slag granulating plant or to cooling pits. Depending upon the cooling process, three types of slags are generated, namely, aircooled slag, granulated slag and
Jan 01, 2018 · The molten slag granulation experimental system consisted mainly of a molten slag supply unit, a centrifugalair blast granulation unit and an image capture unit, as shown in Fig. 1.For the molten slag supply unit, we employed a hightemperature furnace with a graphite crucible to melt the BF slag.
temperature blast furnace slags (BF slags) and 70 million tons of steel slags were produced [6] and the total waste heat was more than 4.80 × 1019 J, equivalent to 16 million tons of standard coal, whereas less than 2% of that was recovered, according to the estimation of Cai et al. [7], so there is a great potential of waste heat recovery.
The present invention provides a blast furnace smelting slag water quenching waste steam waste heat recovery system. The system comprises a blast furnace slag water quenching apparatus, a slag quenching water circulation apparatus and a waste steam waste heat recovery apparatus. The blast furnace slag water quenching apparatus comprises a smelting slag groove, a water quenching
So, not only the sensible heat of the liquid slag is lost, but it is also necessary to have an upstream slag drying unit for using the granulated BF slag in cement industry. Drying process normally consumes heat energy up to 72Mcal/ton of slag. Dry granulation of liquid BF slag is being developed in many countries along with heat recovery process.
Appliion of Phase Change Materials in Heat Recovery from Blast Furnace Slag Renuka Sahu1 1Department of Mechanical Engineering, National Institute of Technology Raipur Raipur, Chhattisgarh, India Abstract The objective of this paper is to suggest a suitable method for heat recovery from blast
Blast furnace slag production in Japan Production of blast furnace slag 290 kgslag/1000 kg iron ÆAnnual production of slag is 24 Mt. For one large scale blast furnace, production rate of melted slag (at about 1500℃) is 100 – 150t/hour. Solidified by natural cooling in atmosphere or rapid cooling by water. ÆHeat recovery has not yet been
Abstract: A large amount of various molten oxides, such as steelmaking slag and lava, is cooled without heat recovery. For example, the amount of slag as a byproduct of steelmaking, over 1723 K in temperature, reaches 30 million tones annually. Although the systems for efficient heat recovery from molten slag have been proposed, the technology has not established yet.
is now to develop methods for DRY SOLIDIFICATION WITH HEAT RECOVERY OF FERROUS SLAG without putting this longtime experience in slag utilisation at risk for the new technique. Blast furnace slag Due to the necessity to reduce CO 2 emissions in cement, making the partial substitution of cement clinker with granulated blast furnace slag has
Jul 31, 2012 · Abstract. Blast furnace (BF) slag, which is the main byproduct in the ironmaking process, contains large amounts of sensible heat. To recover the heat, a new waste heatrecovery system—granulating molten BF slag by rotary multinozzles cup atomizer and pyrolyzing printed circuited board with obtained hot BF slag particle—was proposed in this study.
At the present molten slag from a blast furnace (B.F.) is granulated by impinging much water without any recovery of its much sensible heat (1823K), polluting water and atmosphere. To solve these problems, we studied the dry granulation of molten slag by Rotary Cup Atomizer (RCA), in
In the area of heat recovery from molten slags, some work is already 1n progress in Sweden and Japan. In Sweden, a subsidiary of the State Steel Company, Merox Ltd, is developing a process for granulating and recovering heat from slag. The slag is granulated by striking a falling film of slag with previously solidified slag particles.
Crystallization of Blast Furnace Slags Pertaining to Heat Recovery Shaghayegh Esfahani Doctorate Materials Science and Engineering University of Toronto 2016 Abstract Heat recovery from blast furnace slags is often contradicted by another requirement, to generate amorphous slag for its use in cement production.
Slag as heat storage material for waste heat recovery (leaded by CIC Energigune). The primary energy requirements of heavy industries are intensive. Even if companies are putting a big effort to reduce the needed input energy and optimize the overall energetic efficiency, between 3050% of this energy is lost during the manufacturing process.
Blast furnace slag present invention dry granulation and heat recovery furnace slag and waste heat recovery process translated from Chinese . particles, and then using the remaining heat recovery technology methods.
The blast furnace remains an important part of modern iron production. Modern furnaces are highly efficient, including Cowper stoves to preheat the blast air and employ recovery systems to extract the heat from the hot gases exiting the furnace. Competition in industry drives higher production rates.
Blast furnace slag (BF slag) is a byproduct from blast furnace exhaust temperature of 1450℃ or so, is a highquality waste heat resources. In China, the steel industry produces approximately 220Mt of BFS per year, and the enthalpy of those slags is approximately equivalent to 13.3% of the whole energy consumption in the ironmaking process[1].
In summary dry granulation of blast furnace slag allows an environmental friendly and sustainable subsequent processing for one of the last big heat recovery potentials at a modern blast furnace. [1] References [1] McDonald, I., Long, E., Werner, A. & Most, D. (2010) Dry slag granulation The environmental friendly way to making cement.
Jun 25, 2016 · The cold nitrogen took away the waste heat of slag particles and entered into waste heat boiler . Maruoka et al. proposed a system for sensible heat recovery from slag particles by an endothermic chemical reaction . In the system, molten slag was first granulated by rotary cup and the hightemperature slag particles were poured into a packed bed.
Aug 09, 2014 · Without the need of an upstream drying system for the blast furnace slag energy and as in consequence CO2 can be saved. In summary dry granulation of blast furnace slag allows an environmental friendly and sustainable subsequent processing for one of the big heat recovery potentials at a modern blast furnace.
The granulation and heat recovery technologies towards molten slag of steel industry are reviewed. The working principle, research status, challenges and prospects of these technologies are analyzed. Centrifugal granulation combined with chemical heat recovery
201525 · Offgas temperature measured as a function of time for the dry granulation of a blast furnace slag at 1,450 °C for a slag tapping rate of 7.6 kg/min and Ichimura S, Kondo M (1985) Development of slag blast granulation plant characterised by innovation of the slag treatment method, heat recovery and recovery of slag as resources.
granulation offers advantages over these common slag handling practices, including the production of byproducts, the recovery of thermal energy, and the eliminated consumption and safety hazards of water. For these reasons, there have been various studies in dry granulation and heat recovery
