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Download Free PDF. Download Free PDF. Experimental study of rotating dry slag granulation unit: Operating regimes, particle size analysis and scale up. Kali Prasad. CFD simulation of free surface flow and heat transfer of liquid slag on a spinning disc for a novel dry slag granulation process. By Peter Witt.
The CSIRO’s Dry Slag Granulation (DSG) process is as a continuous two-step p rocess as shown in Figure 1. The. molten slag is first atomized using a spi nning disc and the fine droplets (< 2 mm
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:
tical use. They include the air granulation process, whereby a high-pressure gas is blown onto the molten slag to solidify and granulate the slag while it is being cooled; ISC process,3) whereby the hot slag is first poured into a steel box for accelerated cooling/solidification and then subjected to water sprinkling and immersion cooling; and
Some Fundamental Aspects of the Dry Slag GranulationProcess . Sharif Jahanshahi*, Yuhua Pan and Dongsheng Xie . CSIRO Minerals Down Under National Research Flagship, Clayton, Victoria, 3168, Australia . Abstract: There is a growing interest in development of a dry slag granulation (DSG) process so as to recover the
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.
Ground-granulated blast-furnace slag (GGBS or GGBFS) is obtained by quenching molten iron slag (a by-product of iron and steel-making) from a blast furnace in water or steam, to produce a glassy, granular product that is then dried and ground into a fine powder.Ground-granulated blast furnace slag is highly cementitious and high in CSH (calcium silicate hydrates) which is a strength enhancing
The wet granulation process operates with a high water to slag ratio of about 8:1. This wet process is quite accepting to fluctuations in the quantity and properties of the slag, however the wet process has the following drawbacks: • Despite mechanical dewatering in drums, silos or heaps, a residual moisture of
1673 to 1823K in a slag temperature, 10g/s in a slag charging rate and 0.018kg/s in an air mass ﬂowrate. After slag was granulated for a couple of minutes, the distribution of slag size in each zone of the receiver; 0 to 0.3, 0.3 to 0.4, 0.4 to 0.5, and 0.5 to 0.6m in …
The invention relates to a liquid steel slag dry-process granulating device and a sensible heat recovery method. The liquid steel slag dry-process granulating device comprises a feeding device, a dry-process granulator, a cyclone separator and a sensible heat recovery device, wherein the dry-process granulator, the cyclone separator and the sensible heat recovery …
slag has a lower value. For wet granulation, it is expected that a chloride/sulphate grade split of approximately 92/8 can be attained. For the block route, it is believed that a chloride/ sulphate grade split of 85/15 can be attained. In terms of the process complexity it is believed that wet granulation of the slag will be the simpler process
slag. These all require rapid cooling of the slag and this led to the development of the idea that the cooling process could involve recovery of heat which could be re-used. Granulation of slag Slag previously discarded, has commercial . value when processed into the right form, but must be cooled down in a controlled
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
vi) Slag Granulation Plant (SGP) / Slag Dumping Yard: During the process of iron making, the impurities are fluxed and removed as slag. The hot liquid slag is made into slag granules by means of high pressure water jets in the Slag Granulation Plant in the Cast House itself (sometimes separate SGP is located at a distance from the furnace proper).
Slag treatment is the main ecological problem of the modern Ukraine metallurgy manufacture. The blast-furnace slag is the by-product of the ironmaking process. It has produced in the blast-furnace in the amount of 300 kg per tonne of pig iron. Now in Ukraine the blast-furnace slag is treated by impinging much water for granulation. This
The process of granulation in blast furnace slag (BFS) by gas quenching can effectively recover the waste heat of BFS and improve the value-added nature of the BFS byproduct. With decreasing temperature, BFS crystallizes into melilite, anorthite,
granulation process.Joining particles within a given granulation process will improve flow and compression characteristics,reduce segregation, improve content uniformity,and eliminate excessive amounts of fine particles.The results will be improved yields,reduced tablet defects,increased productivity,and reduced down time.The objective of the
In dry granulation process the powder mixture is compressed without the use of heat and solvent. It is the least desirable of all methods of granulation. The two basic procedures are to form a compact of material by compression and then to mill the compact to obtain a granules. Two
Abstract: The process of granulation in blast furnace slag (BFS) by gas q uench-ing can effectively recover the waste heat of BFS and improve the value-added nature of the BFS byproduct. With decreasing temperature, BFS crystallizes into melilite, anorthite, spinel, etc. Mineral crystallization, however, is not conducive
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.
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.
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
Figure 4: Predicted relationship between slag tapping rate and disc spinning speed for maintaining different film thickness (Disc radius: 25 mm, Liquid slag viscosity: 0.7 Pa s, Liquid slag density: 2590 kg m-3). In summary, CFD modelling has played a key role in the design, operation and scale up of CSIRO’s dry slag granulation process.
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.
slag is hence the key to achieve its further valorisation as an aggregate in civil engineering applications. Granulation is one of the most adopted particle size enlargement techniques. This process, generally applied in wet or dry mode , has numerous applications in several industrial sectors. Wet
Oct 01, 2020· New process for dry granulation and heat recovery from molten blast-furnace slag Ironmaking Steelmaking. , 12 ( 1985 ) , pp. 14 - 20 , 10.1016/0304-386X(85)90024-6 View Record in Scopus Google Scholar
Slag, treatment, reduction, metal and heat recovery, granulation, slag product . 1. Introduction The metallurgical industry generates every year huge amounts of slag. The annual amount of generated steelmaking slags alone is more than 100 million tons. The steel slag is normally used as construction materials, for instance, for
granulation affiliated with dry granulation is the optimum process, with smaller slag particle size (about 2mm), more glassy phase and higher recovery rate. 1 Introduction
1673 to 1823K in a slag temperature, 10g/s in a slag charging rate and 0.018kg/s in an air mass ﬂowrate. After slag was granulated for a couple of minutes, the distribution of slag size in each zone of the receiver; 0 to 0.3, 0.3 to 0.4, 0.4 to 0.5, and 0.5 to 0.6m in a distance from the center of the cup, was collected.