Granulation and Heat Recovery from Metallurgical …
Traditionally, metallurgical slags have been air cooled in slag pots or large yards. Slag pot cooling is a slow process thus allowing crystallisation of various mineral phases as well as separation of metallic and matte phases into droplets. The slag that is poured into pits is cooled by air … See more
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A review of waste heat recovery technologies towards molten slag …
Abstract. Molten slag exhausted with critically high temperature of about 1450–1550 °C is a potential resource of energy and raw materials. Water quenching is a traditional heat recovery technology, which uses cold water to cool down slag so as to achieve the desired glassy by-products. However, this technology consumes a huge …
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Processing of Non-Ferrous Metallurgy Waste Slag for its …
The article presents an overview of the methods of processing slag from Waelz process, and various approaches employed by scientists globally, aimed at processing such slags. Despite several listed methods of processing slag from Waelz process, none entails a sufficient complex nature of its processing. In addition, the slag …
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Granulation and Heat Recovery from Metallurgical Slags
Metallurgical slags are produced at a massive rate of over 750 Mt/year, and carry a thermal energy equivalent to 40 Mt/year of coal. The potential mineral and thermal energy values of slags are in the order of $22 b and $3–6 b per year. Such attractive figures, together with tightening legislation on disposal of slag and the carbon footprint …
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Heat Recovery from Slag through Dry Granulation
The heat recovery from high temperature slags (1450–1650 °C) from the metallurgical process represents one of the greatest potential to reduce the carbon emission in the steel industry (460 ...
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Metallurgical Slag | SpringerLink
The specific gravity of slag ranges between 3 and 4 as compared to 5.5 for sulfide matte and 7–8 for iron and steel. The slag cover protects the metal and matte from oxidation and prevents heat losses due to its poor thermal conductivity. In an electric furnace, slag may be employed as a heat resistor.
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Granulation and Heat Recovery from Metallurgical …
Metallurgical slags are produced at a massive rate of over 750 Mt/year, and carry a thermal energy equivalent to 40 Mt/year of coal. The potential mineral and …
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Energies | Free Full-Text | Heat Recovery from High …
Waste heat recovery from high temperature slags represents the latest potential way to remarkably reduce the energy consumption and CO2 emissions of the …
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Future trend of terminal energy conservation in
Section snippets Chemical methods of metallurgical slag waste heat recovery. Because the heat recovery rate (<65%) and exergy efficiency of physical methods are relatively low, sophisticated chemical methods have been developed to accomplish slag waste heat, which can be divided into four categories: methane …
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Thermodynamic analysis on molten slag waste heat cascade recovery …
Thermal energy recovery of pyrometallurgy slags is a worldwide problem that is widely concerned for decades. As chemical recovery method, molten slag cascade recovery method (MS-WHCR) is proposed in this work. As typical endothermic chemical reactions, pyrolysis, gasification, calcination and reforming reactions are applied in this …
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Sludge Gasification Using Iron Bearing Metallurgical Slag as Heat …
Waste heat recovery is a key problem to be solved for metallurgical slag. Furthermore, the heat source is a current bottleneck for sewage sludge gasification technology. At present, there is no complete process system for the thermochemical conversion of sludge driven by metallurgical slag waste heat. To recover the waste …
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Waste Heat Recovery from Blast Furnace Slag by Chemical …
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 heat-recovery system—granulating molten BF slag by rotary multinozzles cup atomizer and pyrolyzing printed circuited board with obtained hot BF slag particle—was proposed in …
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Applied Thermal Engineering
and waste heat recovery system for metallurgical slag. In the work ... packed bed of slag particles [9]. In this process, the extent of methane conversion could reach a maximum of 96%. Liu et al.
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Multi-Step Recycling of BF Slag Heat via Biomass for CO
The torrefaction process is linked with slag heat recovery and via the BASE method with enhanced blast furnace operation. Such a combination reduces CO2 emissions significantly in ironmaking processes. ... Barati, M.; Jahanshahi, S. Granulation and Heat Recovery from Metallurgical Slags. J. Sustain. Metall. 2020, 6, 191–206. …
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Future trend of terminal energy conservation in
In steelmaking process, molten slag like BOF (Basic Oxygen Furnace) slag or EAF (Electric Arc Furnace) slag was discharged after steel tapping, and then poured …
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Comprehensive utilisation of blast furnace slag
At present, although the comprehensive utilis-ation rate of domestic blast furnace slag is more than 80%. However, the blast furnace slag treat-ment is dominated by the water quenching pro-cess, and a large amount of physical sensible heat is wasted in the process of water slag ushing. fl.
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An Overview of Precious Metal Recovery from …
Steel slag is a solid waste of the steel industry, produced during steel production. Three types of slag, namely electric arc furnace (EAF), basic oxygen furnace (BOF), and Linz-Donawitz processed slag …
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The pretreatment of non-ferrous metallurgical waste slag …
The pretreatment of non-ferrous metallurgical waste slag and its research progress in the preparation of glass-ceramics. ... such as raw material composition, process, heat treatment system, and so on (Cruz et al., 2022; ... Compared with the unmodified slag, the iron recovery rate of the modified slag was greatly increased from …
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Three-Stage Method Energy–Mass Coupling High-Efficiency …
The heat recovery rate of steel slag is greater than 80 pct. From the perspective of resource recovery, this method fully utilizes the resource attributes of steel slag to produce low-temperature solid steel slag, which can be used as a raw material for new-type plates and floorings. From the ecological point of view, excessive CO 2 …
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Process Concept for the Dry Recovery of Thermal …
If a process for slag heat recovery is implemented with sufficient energy yields, the financial benefit is quantifiable depending on the energy's utilization. ... (2015) …
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Heat Recovery and Energy Optimization in Smelter …
Metallurgical process off-gas presents real ... and slightly less than the blowing rate during slag blow. Process gas temperature is typically 1100 to 1200°C. The gas is captured by a primary hood, which typically allows 100 to 120% infiltration air into ... Heat recovery units need to be designed to allow streamlined gas flow through the unit ...
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Current Development of Slag Valorisation in China
Slags are byproducts of the metallurgical industry. It is of importance to recycle materials and recover heat from metallurgical slags to reduce the energy consumption and environmental impact of steel industry. China is the largest iron- and steelmaking slag producer in the world, and intensive efforts have been made during last …
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Granulation and Heat Recovery from Metallurgical …
Granulation and Heat Recovery from Metallurgical Slags. A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Mineral …
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Development of waste heat recovery technology from …
With the development of the iron and steel industry, the output of steel slag is also increasing year by year. In 2021, the output of steel slag is about 150 million tons. In terms of sensible heat recovery and utilization of steel slag, there are no application examples in the world. The main reason is that the technology is still immature.
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Energy Saving and Emission Reduction from the Steel Industry: Heat …
The steel industry is an energy-intensive and CO 2-intensive industry and the greenhouse gas (GHG) emission in the steel industry was more than 2.95 billion tons in 2012, which faces the great challenge of energy saving and CO 2 emission reduction in the context of global warming. The heat recovery from high temperature slags (1450–1650 …
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Advances in recovery of valuable metals and waste heat from copper slag
Based on this, the chemical method is the main mode of copper slag waste-heat recovery, in which high-temperature solid copper slag is used as the heat carrier for typical endothermic chemical reactions. ... Element flow analysis must also be performed on the entire metallurgical copper slag process. 5. Conclusions. The recovery methods …
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Ligament Mode Disintegration of Liquid Film at the
5. Conclusion In the waste heat recovery process of molten slag by dry granulation method based on rotary disk atomizer, the waste heat recovery efficiency is mainly determined by the slag particle size. In this paper, a simple model to characterize the ligament formation at the disk rim, the disintegration of the ligament into droplets is ...
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RESEARCH OVERVIEW ON RECOVERY OF WASTE HEAT …
Although different water quenching methods differ in the specific process, they all have common disadvantages[3-4]: 1) waste of the heat resources in blast furnace slag; 2) …
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Energy recovery from high temperature slags
Metallurgical slags are conventionally divided into ferrous and non–ferrous, based on the metal produced in each process. The typical chemical composition and …
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Advances in recovery of valuable metals and waste …
Based on this, the chemical method is the main mode of copper slag waste-heat recovery, in which high-temperature solid copper slag is used as the heat carrier …
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