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.
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 …
Semantic Scholar extracted view of "Experimental investigation on granulation characteristics and waste heat recovery of molten slag in gas quenching dry granulation technique" by Li-li Wang et al. ... and popularization of the air-quenching granulation process, this ... slag granulation for waste heat recovery from various metallurgical …
Metallurgical slags are conventionally divided into ferrous and non–ferrous, based on the metal produced in each process. The typical chemical composition and generation rate of various slags for the major metal manufacturing processes are provided in Table 1, Table 2.As seen, the relative amount of slag produced per ton of iron/steel is …
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 …
Through mass balance and energy balance, the theoretical heat recovery rate can reach 81.42 pct when the waste heat stored in steel slag is converted into …
Technological Process. As shown in Figure 2, high-speed air is used as the heat recovery medium to rapidly cool the high-temperature molten steel slag in the first stage of heat recovery, accompanied by the centrifugal granulation of steel slag.The steel slag is granulated by centrifugation to form steel slag droplets, comprising high …
Slag granulation with heat recovery is an essential and emerging technology for sustainable metal production. This technology has been developing for a …
Waste heat recovery from high temperature slags represents the latest potential way to remarkably reduce the energy consumption and CO2 emissions of the steel industry.
As the largest output of solid waste in the ISI, the production of blast furnace slag (BFS) by the blast furnace method exceeded 1.279 billion tons with extremely high temperature of 1500–1600 ℃ based on the global iron production estimation in 2022 (Duan et al., 2024b).The slag contained total residual waste heat of 7.55×10 8 GJ, equivalent to …
The recent progress of hot stage processing for steelmaking slags in China considering stability and heat recovery is reported and discussed. In industry, several projects are being constructed ...
1. Introduction. Molten blast furnace slag (BFS) is the main by-product of iron making process with the 1450–1550 °C discharge temperature [1], which contains large amounts of physical sensible heat and belongs to high-quality waste heat resource [2].Each ton of molten slag contains 1260–1880 kJ thermal energy which is equivalent to 60 kg …
Introduction. China is the world's largest steel producer, with the China Iron and Steel Association estimating that the country's crude steel production in 2022 will be 935 million tonnes [Citation 1].Steel slag mainly refers to the blast furnace slag and converter slag produced in the process of iron making and steel making, and with the …
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 …
A comprehensive review of waste energy of slag and its recovery methods are presented. The waste heat of slags amounts to ∼220 TWh/year. Recovery of three …
Iron- and steelmaking processes create slags, valuable by-products. Industrial utilisation of slag as a lower-value secondary mineral source has been established for decades. Slag heat recovery is an ongoing research topic and has the potential to maximise energy efficiency in iron and steel production. Heat recuperation …
The results of the present study show that, in the centrifugal granulation process of blast furnace slag using a spinning cup operated in the ligament disintegration mode, the breakup of a single molten slag ligament is very similar to that of a single water or liquid paraffin ligament, and both approximately follow the Rayleigh Disintegration ...
The recent progress of hot stage processing for steelmaking slags in China considering stability and heat recovery is reported and discussed. ... A multitude of laboratory and industrial studies have been performed to …
BFS and SS are the main by-products in the iron-and-steel smelting process, producing a considerable amount of the output, and they have high contents of CaO and MgO, which can be used for CO 2 capture and fixation. Using BFS and SS as raw materials for mineral carbon sequestration realizes "treating waste with waste," which is …
After being subjected to granulation, BF slag can subsequently undergo a heat recovery process to extract the thermal energy. Based on the energy conversion forms of the BF slag particles, the heat recovery technology used for extracting thermal energy from BF slag is classified as either the physical method or the chemical method.
The metallurgical industry is a typical energy and resource-intensive industry, and it is also the pillar industry in China. ... Research in Australia jointly carried out a scheme for slag waste heat recovery [2].The process flow chart presented by the team was shown in Figure 1.The system
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 …
Structure and properties of porous glass-ceramics sintered from metallurgical silicon slag [J]. Transactions of Materials and Heat Treatment, 2017, 38: 1âˆ'6. (in Chinese) [10] CAO Jian-wei, LU Jin-shan, JIANG Long-xiang, WANG Zhi. Oxidation behavior of metallurgical silicon slag under non-isothermal and isothermal …
Through the metallurgical process, the liquid slags were first produced and then supplied into the cup. The cup with liquid slags was then rotated with the set rotating speed, and meanwhile, the compressed air was ejected into the molten slags to improve the granulation process. ... For example, for the slag heat recovery using gasification ...
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 …
Centrifugal granulation is a crucial step in the most promising heat recovery technique for molten blast furnace slag. Facing the fact that slag viscosity changes during the granulation process, in the present work, visualization experiments were conducted for centrifugal granulation of mixture liquids by a spinning disc.
The management and utilization of metallurgical waste resources is an inevitable requirement to create a sustainable metallurgical industry. In the blast furnace smelting process of vanadium titanomagnetite, approximately 3 million tons of the industrial solid waste of titanium-bearing blast furnace slag is produced each year in the …
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 …
5.1 Part I: Blast Furnace Slag Atomization at Full-Scale. Ecomaister began studying the slag atomization of iron-making blast furnace (BF) slags in 2013 and demonstrated the production of atomized BF slags at a laboratory scale (Table 1, POSCO-2013 and SSAB-2015).Early laboratory scale experiments that remelted BF slags and …
With the innovative approach presented in this work, it is possible to recover thermal heat from liquid slags. The process concept consists of a slag tundish and four …
In response to the pressing global issue of reducing carbon emissions and the crucial technical challenges of fully utilizing steel slag, researchers have been studying an accelerated carbonation process that entails the carbonation of basic oxides in steel slag to store CO2. However, despite its promising potential, the process has yet to see …
Waste heat recovery from high temperature slags represents the latest potential way to remarkably reduce the energy consumption and CO2 emissions of the steel industry. The molten slags, …
Highlights A comprehensive review of waste energy of slag and its recovery methods are presented. The waste heat of slags amounts to ∼220 TWh/year. Recovery of three energy forms from slag heat is under development: thermal, chemical, thermoelectric.
Hot slags, at the temperatures of 1450–1650°C, carry a substantial amount of high quality thermal energy, which represents the largest undeveloped energy source in the steel industry. However, the waste heat recovery rate in China is less than 2%; thus there is a great potential of waste heat recovery.
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 elaborate on ...
In the early works, airflow velocity was less than 100 m·s −1 [13], which brought about two problems: one was that impact kinetic energy was not enough, the obtained slag particle diameter was larger (the average diameter is about 2–4 mm) [14]; the other one was that air-slag heat exchange was poor, the waste heat recovery rate was …
and waste heat recovery system for metallurgical slag. In the work ... the rotary granulating disk in waste heat recovery process of molten slag, Appl. Therm. Eng. 63 (2014) 387–395.
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 …
The waste heat recovery and utilization technologies, which give consideration to both heat recovery rate and cooled slag particles with high quality and high additional value, will be a key to ...
Request PDF | On Jun 1, 2016, Junxiang Liu and others published Experimental investigation on molten slag granulation for waste heat recovery from various metallurgical slags | Find, read and cite ...
