energy-saving potential in China. The Blast Furnace (BF) energy consumption account for the largest percentage, and responsibly, it should bear more energy conservation and emissions reduction such as BF slag sensible heat recovery. 2 Blast furnace slag and its utilizations Blast furnace slag is a by-product of blast furnace (BF) ironmaking ...
In the dry centrifugal granulation process to treat liquid blast furnace slag, it is critical to clarify the cooling and crystallization characteristics of slag particles, which greatly determine their subsequent reutilization and waste heat recovery.Here, we investigated the cooling characteristics of a single slag particle by simulation in terms of …
The furnace itself is a tall, vertical shaft that consists of a steel shell with a refractory lining of firebrick and graphite. Five sections can be identified. At the bottom is a parallel-sided hearth where liquid metal and slag collect, and this is surmounted by an inverted truncated cone known as the bosh.Air is blown into the furnace through tuyeres, water-cooled …
With the aim of utilizing blast furnace slag in the iron and steel industry at low cost, pollution free, refinement, and high value added, an entirely subversive technical route was presented, which was a novel synergistic utilization of slag to produce zeolite and hydrotalcite-like compounds. The object of this study is to obtain the optimal operating …
'slag' generally refers to ground, granulated, iron blast furnace slag – with the descriptors to be explained and developed in this technical note. In a general sense, the term 'slag' refers to a waste material separated from metals during the smelting or refining of an ore in a blast furnace. 'Slags' are formed during the smelting or
The present study evaluates the effect of utilising granulated blast furnace slag as a partial substitution of the fine fraction of natural aggregates on various concrete parameters using the general factorial approach. Two levels of the water/cement ratio (0.45 and 0.5) and four different percentages of granulated blast furnace slag (0, 20%, 40% …
After crushing and screening, air-cooled blast furnace slag (ABS) provides an eminently suitable material for use as a construction aggregate in bound or unbound form, like any natural rock. …
The performance of blast furnace slag treated by wind quenching is significantly better than that of water quenching slag, and the heat recovery rate is high, …
Blast furnace slag is a major by-product of the iron-making process, discharged from a blast furnace. The temperature of the molten slag reaches as high as 1500 °C. ... This section describes the detailed slag crushing process based on the simulation results and then analyzes the slag crushing mechanism based on its …
2.1 Materials. Lack of the conditions of direct air-quenching of liquid steel slag, this experiment uses cooled steel slag as the raw materials (as shown in Fig. 1), which are firstly re-melted in a small DC arc furnace and then used for the air-quenching process.The raw materials in this experiment are untreated converter steel slag and …
The present research provides an understanding of the two different types of slags of water quenched granulated slag and air-cooled slag that are generated from …
Keywords Gas quenching granulation · Blast furnace slag · Surface wave · Numerical simulation · Analysis of dimensions 1 Introduction Blast furnace slag is a major by-product of the iron-making ... of the slag crushing process and its internal mechanisms in conventional experiments due to poor working links, limited measurement means, and ...
Some of the above applications have mainly economic rather than technical drawbacks, as the crushing of slag to very fine sizes can be excessively costly (Fonseca et al., 2013; Wang et al., 2013). ... AODS, argon oxygen decarburization slag; BFS, blast furnace slag; EAFOS, electric arc furnace oxidizing slag; EAFRS, ...
Using centrifugal granulation technology to recover energy from blast furnace slag efficiently is the direction of metallurgy industries for realizing sustainable development.Influences of operation parameters such as diameter,depth and speed of rotating disk and mass flow rate of slag on the atomization need to be studied for getting …
The treatment of liquid blast furnace (BF) slag, a by-product of the iron-making process, is one of the breakthrough points, since it contains a large amount of high-grade ... [13], [14]], and mechanical crushing [15, 16] were proposed for expecting effectively recovering waste heat while realizing high value-added resource utilization ...
Titanium-bearing blast furnace slag (BFS) has valuable compositions and potential environmental hazardousness. Thus, developing efficient and green approaches to utilize BFS is highly desired for resource economization and environmental protection. In the past decades, many attempts have been adopted to reuse BFS efficiently, and significant …
In the process of centrifugal dry granulation of blast furnace slag, the thickness of the liquid film at the outlet of the rotor will have a significant impact on the degree of crushing of the slag after leaving the rotor and the size of …
Iron (Blast Furnace) Slag Blast furnace slag is often used when maximum durability, higher strength, hardness of aggregate, fire resistance, better insulation and lighter weight are required. The shape and texture of blast furnace slag promote excellent bonding with cement mortar. Blast furnace slags can be used as aggregates although they
Blast furnace ironmaking fundamentals—zones and reactions in the blast furnace. BF is a counter current reactor with solids, mainly iron-bearing raw materials and coke, charged from the top of the furnace, and oxygen-enriched hot air and auxiliary fuels injected through the tuyeres located in the lower part of the furnace.
When smelting each ton of pig iron, approximately 500 kg of blast-furnace slag is formed and requires recycling. Air-cooled blast-furnace slag can be used for the manufacture of slag aggregate for the …
Molten blast furnace slag, which is rapidly quenched from the furnace, air-cools slowly to form . Where this granulated slag is further processed or ground, the product is referred to as ground granulated blast furnace …
Pelletized blast-furnace slag resulted from cooled blast-furnace slag. It has a vesicular texture and it is used as a lightweight aggregate and finely grounded as cementitious material. Air-cooled blast-furnace slag is naturally cooled with moderate sprinkling. The crystallized slag, after crushing, sieving, and removing magnetic matter, can be ...
As shown in Fig. 1, nearly 80% of blast furnace slag is granulat-ed slag produced by rapidly cooling hot molten slag (initially at a temperature of about 1,500°C) with a jet of high-pressure water. ... ① solidify and cooling of the hot molten slag, ② crushing and magnetic separation treatment of the slag to recover the metal iron,
Blast furnace slag is a solid waste formed by gangue in ore, ash in fuel and nonvolatile components in solvent (generally limestone) in the process of blast furnace ironmaking. It mainly contains oxides of …
In some studies, it has been demonstrated that using a composite mineral admixture known as ground-granulated blast-furnace slag-steel slag composite binder …
Basic oxygen furnace slag (BOF slag) contains high amount of useful oxides such as CaO, MgO, SiO 2, etc., therefore, a solution of the slag recycling would be used as a flux in pelletizing process.
Blast Oxygen Furnace (BOF) slag represents one of the largest waste fractions from steelmaking. Therefore, slag valorisation technologies are of high importance regarding the use of slag as a secondary resource, both in the steel sector and in other sectors, such as the construction or cement industries. The main issue regarding the …
High content amorphous phase blast furnace slag beads were prepared by gas quenching blast furnace slag (BFS), which could not only avoid a series of environmental problems caused by traditional ...
The technological factors required to improve the operational properties of granulated metallurgical slags demanded in the building industry have been analyzed. In order to satisfy these factors, a new technology for hydro-vacuum granulation of slag melts (HVG) has been developed. It is shown that the main advantage of the proposed HVG …
After cooling to 93°C (200°F) or lower, the slag is transported to a plant for crushing and screening to a size appropriate for concrete use (Dobrowolski, 1998).