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Production, Characteristics and Use of Ferrochromium Slags 173 2.1 Ferrochrome slag The temperature of the slag in tapping is 1700 °C and that of the ferrochrome 1600 °C. The smelting point of the slag has to be higher than the metal smelting point, because metal is heated up by using slag .
granulation treatment, which can simplify the handling of the slag out of the EAF and keep under control the structural constitution of the slag thus making possible a recycling of EAF slag after only one treatment process, completely eliminating the risk of swelling and elements leaching to the environment.
A Review of Granulation Process for Blast Furnace Slag. Dry granulation process, as an environmentally friendly method with . dry granulation is the optimum process, with smaller slag particle size (about 2mm), more. >More
Slag handling is an important aspect of modern blast furnace operation. Today, blast furnace slag is a saleable product (granulated slag sand used as CO 2-friendly substitute of clinker in cement production) rather than a difficult and costly waste material.Paul Wurth has developed the INBA ® slag granulation process, incorporating our proprietary dynamic INBA dewatering drum.
Granulation is the process of forming grains or granules from a powdery or solid substance, producing a granular material.It is applied in several technological processes in the chemical and pharmaceutical industries. Typically, granulation involves agglomeration of fine particles into larger granules, typically of size range between 0.2 and 4.0 mm depending on their subsequent use.
of Liquid Slag on a Spinning Disc for a Novel Dry Slag Granulation Process", Progress in Computational Fluid Dynamics, Vol. 10, Nos. 5-6, 2010, pp. 292-299. 7. Y. Pan, P. J. Witt, B. Kuan, and D. Xie, "CFD Simulation of Slag Droplet Formation by a Spinning Disc in Dry Slag Granulation Processes", 8th International Conference on CFD
The granulation of molten material, blast furnace slag for example, is accomplished by wetting the slag with a stream of water and thereafter transporting the thus formed granules away from the point of granulation with the water stream. Water consumption is minimized and average grain size increased by employing a multi-layer water stream defined by currents having different temperatures and ...
slag hauling and production of higher value by-product. Wet granulation allows for fast quenching of molten slag and production of high value glassy material, which, for BF slag, demonstrates desirable cementitious properties post milling. BF slag is typically devoid of metal, making water granulation a manageable process from a safety perspective.
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
to easily penetrate the slag layer during addition as well as allow for a rapid melting and dissolution in the hot metal bath. The granulated product has a homogeneous composition identical to the metal fed into the granulator and without the variations in composition that is obtained when casting in sandpits. 4 GRANSHOT metal granulation process
The wet granulation process operates with a high water to slag ratio of about 8:1. The advantage of the wet process is that it is accepting wide fluctuations in the mass flow and physical/chemical properties of the slag. However, the wet process faces also significant disadvantages:
second granulation tank, one granulation unit can handle the slag of two tap holes. `Continuous filtering and evacuation of dewatered slag sand up to its storage facility without inter-ruptions for purging. ` High reliability. `Measurement of slag flow, due to the design of the drum and the dewatering process.
In the Baosteel Slag Short Flow (BSSF) granulation process developed by Baosteel, the liquid slag is transferred to a granulation drum where it is treated with injected water with a dwell time between three and five minutes, which significantly reduces the amount of unreacted free lime.
that no slag, matte, or alloy responds in similar fashion to a granulation practice. This paper addresses three issues, namely: • Water-granulation of BOF steel slag, without processing it to render it environmentally safe, physically and chemically acceptable for use by the construction industry, and the process economical
For BOF slag treatment, above mentioned pyrolytic self-slaking, HK, and BSSF processes are being accepted. No process considered the heat recovery from molten slag during granulation processes. Large scale application of stabilised steel slag powder in construction is a good way for steel slag .
Granulation is the process of collecting particles together by creating bonds between them. Bonds are formed by compression or by using a binding agent. If one were to make tablets from granulated sugar versus powdered sugar, for example, powdered sugar would be
The slag granulation process and free-surface film flow on the rotary disk (a) a typical static image from high speed video recording of the slag granulation by a rotary disk in CSIRO's dry slag granulation process, (b) schematic of the film thickness profile of molten slag on the rotary disk.
Concept of slag granulation. The process of slag granulation involves pouring the molten slag through a high pressure water spray in a granulation head, located in close proximity to the blast furnace. Granulation process is the controlled quenching of the slag in cold water which does not give time for crystalline growth to take place.
After a thorough comparative analysis of various treatment technologies, it can be concluded that centrifugal granulation affiliated with dry granulation is the optimum process, with smaller slag ...
The present paper covers some of the fundamental aspects of the reactions taking place during dry granulation of molten slag. In particular, the cut in sulphur emission from slag during DSG as compared with conventional wet granulation process and the dynamics of slag .
A potential problem is moisture, which occurs in blast furnace slag during the granulation process. The presence of moisture requires dewatering the blast furnace slag before using it as an additive or as a mineral admixture to Portland cement [10].
The PCB pyrolysis is an endothermic process, which consumes huge amount of energy to ensure the reaction continuously. However, the obtained slag particles contain a huge of high qualities heat in the experiment of dry granulation molten BF slag.
To obtain a good slag reactivity or hydraulicity, the slag melt needs to be rapidly cooled or quenched below 800 °C in order to prevent the crystallization of merwinite and melilite. To cool and fragment the slag a granulation process can be applied in which molten slag is subjected to jet streams of water or air under pressure.
Dry slag granulation is destined to replace conventional water granulation of molten slags in the not too distant future, creating a paradigm shift in the history of slag treatment. In this dry process, molten slag is atomised under centrifugal forces on a spinning disc and the slag droplets generated are quenched and solidified quickly using air.
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