Slag Granulation Technology Abstract: The granulation of blast furnace (BF) slag with water quenching has many disadvantages, such as high water consumption and difficulty in heat recycling. The ... Fig. 2: Flow chart of dry granulation and waste heat recovery process for slag developed by Central
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The process of cast house slag granulation starts with separation of liquid slag from the HM. The liquid slag is led into the granulation chamber through a series of runners protected by lining …
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Gas quenching dry slag granulation process is a type of the dry slag granulation (DSG) method [3], [4]. It utilizes the kinetic energy of transversal supersonic airflow to break up the molten slag into droplets which are cooled to solid slag particles in the cooler, and the waste heat of slag can be effectively recovered without environmental ...
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Abstract: There is a growing interest in development of a dry slag granulation (DSG) process so as to recover the sensible and latent heats from molten slags and convert iron blast furnace slags into a glassy phase that is a suitable replacement for Portland cement.
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Wet granulation Dry granulation Fig. 18 Comparison of estimated capital and operating costs for the integrated dry slag granulation and heat recovery process with conventional wet granulation for ...
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It is far lower than the slag-to-water ratio (5:1) of the high-pressure water granulation slag of the INBA method, and the process equipment is simple, the water consumption is small, the operating cost is low, the slag with iron content is less than 40%, and the dry slag pit is not required, and the area is small [Citation 8]. The TYNA method ...
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This process recov- Slag products are screened and may be used as cement ered 60% of the waste heat in form of heated air at 500 °C. feedstock, abrasive material, fine aggregate for mortar and The granulated slag were less than 10 mm in diameter and 13 Journal of Sustainable Metallurgy Fig. 8 Schematic flow diagram of rotating single-drum ...
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The CSIRO's Dry Slag Granulation (DSG) process is as a continuous two-step process as shown in Figure 1. The molten slag is first atomized using a spinning disc and the fine droplets (< 2 mm ...
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All of these treatment processes make it difficult to achieve rapid cooling of large quantities of steelmaking slag. The gas quenching granulation process is based on the crushing and granulation of molten steelmaking slag to form small molten droplets, which are rapidly solidified under the action of the gas flow.
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The granulation process is a complex space-time, multi-scale, two-phase flow problem [21]. Weber revealed that the breakup of the liquid jet is the result of the interaction between aerodynamic force, ... gas quenching slag granulation process is a gas-liquid flow atomization process which includes primary breakup and secondary breakup [31]. In ...
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Here we review common slag handling practices, the developments in dry slag granulation over the last three decades, introduce the Ecomaister-Hatch dry slag granulation process, and...
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In order to study the behavior of molten blast furnace slag ligament breakup into droplets by centrifugal granulation with a spinning cup, three-dimensional transient CFD model simulations were performed in the present work to study the process of the slag deformation into ligaments upon leaving the spinning cup, which eventually disintegrate into droplets. The …
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The granulation process and the collected slag particles are shown in Fig. 2. Approximately 2 mm slag particles were collected in the slag pot and ground to below 0.074 mm. The ground samples were subjected to X-ray diffraction (XRD, D8 ADVANCE A25; Bruker AXS, Germany) and scanned at a speed of 1°/min within the 2θ range of 20° to 40°. ...
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Water granulation of slag has some shortcomings when measured against increasingly stringent requirements for sustainable operations. As a "wet" process, water granulation cannot recover high-grade waste heat from molten slags. ... As such, it is highly desirable that an alternative slag process could be developed to replace water ...
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Moreover, centrifugal granulation as a key issue has attracted widespread attention. According to the existing experimental research, Yoshinaga et al. [9] and Pickering et al. [10] first proposed the early granulation by spinning disk and cup, respectively, which aimed at waste heat recovery of BF slag.Several follow-up studies by a range of scholars contributed many …
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The basic setup of the plant is pretty simple: slag is fed from the blast furnace tap hole through a slag runner and a vertical, refractory-lined pipe. Entering the granulator, it hits the center of a rotating cup, is forced outwards …
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Slag granulation using water sprays is now an established technology that not only simplifies blast furnace casting floor operations but also provides an economical route for producing of a valuable raw material for a host of industries.
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In this paper, the slag granulation and heat recovery options are reviewed and given a critical evaluation, aiming to provide a basis for future directions in slag handling. View.
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In this paper, the flying heat transfer characteristics of slag particles are studied in the process of the dry centrifugal granulation. When the solidification time of particle surface decreased ...
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introduce the Ecomaister-Hatch dry slag granulation process, and elaborate on future applications of the technology in the processing of argon oxygen decarburization and blast furnace slags.
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In essence, gas quenching slag granulation process is a gas-liquid flow atomization process which includes primary breakup and secondary breakup [31]. In the primary breakup, the growth of Kelvin Helmholtz (KH) unstable wave at the gas-liquid interface causes the film to break up into ligaments [32] .
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CSIRO has been working on a dry granulation process, integrated with heat recovery, since 2002. It involves a rotary disc that atomizes molten slag to produce liquid droplets, which are rapidly quenched to become solid granules. The hot granules are fed to a counter-current moving packed bed heat exchanger, where they are further cooled and finally …
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The dry slag granulation process is essentially to atomize the liquid slag and then to cool the particles rapidly so as to produce a glassy slag. The atomization is done using a rotary cup air blast atomizer. The particles cool as they travel through the air and are then cooled further in a fluidized bed. Both of these processes provide the ...
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The physical and mathematical model of molten converter slag particle has been established in this paper. The laws of solidification and heat transfer of molten converter slag particles with the diameter of 2 mm in the process of air quenching granulation at different air velocity have been simulated by FLUENT, which the conclusion is as follows: the …
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Process scheme of the dry slag granulation pilot plant at voestalpine Stahl Recovering heat with air. The basic setup of the plant is pretty simple: slag is fed from the blast furnace tap hole through a slag runner and a vertical, refractory-lined pipe. Entering the granulator, it hits the center of a rotating cup, is forced outwards and atomized.
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This first process was based on water granulation of steel-laden slag, followed by separation of the metal-rich and poor (slag) streams. Safety improvements led to the use of air as a granulation medium and the elimination of water. This created a completely dry granulation (atomization) process and novel slag materials with interesting properties.
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disc/cup offers a more efficient process for slag granulation [10], which uses less air than blasting with air to break up the slag into droplets, thus has the potential to produce a higher grade ...
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INBA process for slag granulation; INBA process for slag granulation. satyendra; May 31, 2020; 0 Comments ; Leave a Comment Cancel Reply. About IspatGuru. Through the ispatguru website I share my knowledge and experience gained through my association with the steel industry for over 54 years.
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Increasing the cooling air volume in the granulation chamber to accelerate the heat transfer and solidification rate of the slag droplet for forming a stronger slag shell at the flight process, and setting waste-cooled jacket and arranging tuyeres around device surface were the currently tried method to avoid the crushing and bonding phenomenon ...
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In this paper, the slag granulation and heat recovery options are reviewed and given a critical evaluation, aiming to provide a basis for future directions in slag handling.
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Our dry slag granulation technology transforms molten slag from steel furnaces into granules using air stream, eliminating the need for water.. The flexibility of the process allows obtaining granules of different sizes and with different ratio …
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B. Du, G. L. Ruo, R. Q. Jiang, The development of molten slag dry granulation and waste heat recovery technology, The 14th national meeting of drying technology, 3–13 ... G. H. Thomas, New process for dry granulation and heat-recovery from molten blast-furnace slag. Ironmaking & Steelmaking, 14–21 (1985) ...
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Our dry slag granulation technology transforms molten slag from steel furnaces into granules using air stream, eliminating the need for water. The flexibility of the process allows obtaining granules of different sizes and with different ratio …
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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 …
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