Effects of Slag Composition on H2 Generation and Magnetic Precipitation from Molten Steelmaking Slag–Steam Reaction

Li, Juncheng; Bhattacharjee, D.; Hu, Xiaojun; Zhang, Mengjie; Sridhar, Seetharaman; Li, Zushu

doi:10.1007/s11663-019-01533-z

Cited by 7 publications

(5 citation statements)

References 34 publications

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“…This article reviews the recent progress on the four important topics of BOS slags: 1) slag formation, i.e., dissolution of lime in the Reproduced with permission. [141] Copyright 2019, Springer Nature. BOS slag; 2) high-temperature phase transformation of BOS slags; 3) transient phenomena in BOS slags due to metal droplet-slag-slag reactions; and 4) energy and material recovery from BOS slags.…”

Section: Discussionmentioning

confidence: 99%

“…Recently a novel process was developed by the present authors [140][141][142] to recover thermal energy from molten BOS slag as syngas and hot gas, and recover valuable metals (Fe, Mn) in the form of magnetite by controlling the crystallization of the BOS slag after reacting the molten BOS slag with moisture. This process is based on the reaction of the molten steelmaking slag with the moist atmosphere (Figure 9).…”

Section: A Novel Process To Recover Energy and Materials From Bos Slagmentioning

confidence: 99%

“…This novel process has been extensively studied in terms of the fundamental understanding of the reaction mechanisms, effects of processing parameters on hydrogen harvesting, and optimal conditions for controlled crystallization of targeted phases. [140][141][142]…”

Section: A Novel Process To Recover Energy and Materials From Bos Slagmentioning

confidence: 99%

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confidence: 99%

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Basic Oxygen Steelmaking Slag: Formation, Reaction, and Energy and Material Recovery

Spooner

et al. 2021

steel research int.

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The basic oxygen steelmaking (BOS) process produced over 70% of the global crude steel in 2018, [1] generating 100 to 150 kg of slag ("BOS slag") for every tonne of crude steel produced. BOS slag, a product of hot metal element (e.g., Si, Mn, Fe, P) oxidation and flux (e.g., lime, dolomite) dissolution, plays a critical role in the production of high-quality crude steel.All elements present in the hot metal charged in the BOS converter are thermodynamically very unstable with respect to their oxides when exposed to the oxygen jet at the BOS operating temperatures. Thus, carbon, silicon, manganese, phosphorus, and the iron itself all tend to oxidize very rapidly to form CO (or CO 2 ), SiO 2 , MnO, P 2 O 5 , and FeO (or Fe 2 O 3 ), respectively. In the BOS practice, large quantities of iron and silicon are initially oxidized to give a liquid, predominantly binary, FeO-SiO 2 slag, which floats on top of the metal pool. Usually lime (CaO) is rapidly added to "neutralize" this acid FeO-SiO 2 slag and produce a "basic" multicomponent FeO-SiO 2 -CaO-MnO-Al 2 O 3 -MgO-P 2 O 5 slag. This basic slag produces the correct partition of metalloids, particularly phosphorus, between the slag and metal and also protects the basic vessel lining (usually magnesite, MgO). Over the entire blowing period of the BOS process, this basic slag is emulsified with a large amount of gas bubbles and metal droplets, and the gas-slag-metal droplet reactions control the element transfer between the steel and slag (e.g., phosphorus removal and reversion) and subsequently the productivity and crude steel quality, which greatly attracts great interest from academics to understand the transient phenomena in the gas-BOS slag-metal droplet system. After completing its refining function in the BOS process, the hot BOS slag is poured into a slag pot. The BOS slag was considered a waste in old times but now as a secondary resource because it contains a large amount of thermal energy (temperature up to 1700 C), chemical energy (metallic and low-valence metallic oxides), and valuable materials (e.g., iron oxides).The behavior of BOS slag inside the BOS vessel, e.g., formation and reaction with gas and metal droplets, is still not clear and its recycling, including energy and material recovery, has always been challenging. This article introduces some BOS-slag-related research conducted by the present authors, in addition to a critical review of relevant research reported in the literature. It covers the topics of lime dissolution (slag formation), high-temperature-behavior interrogation through in situ observation, slag-metal droplet reaction mechanisms (spontaneous emulsification), and recovery of energy and materials from the molten BOS slag. This article aims to provide state-of-the-art understanding on relevant research topics and point out new research directions.

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Section: Discussionmentioning

confidence: 99%

Section: A Novel Process To Recover Energy and Materials From Bos Slagmentioning

confidence: 99%

Section: A Novel Process To Recover Energy and Materials From Bos Slagmentioning

confidence: 99%

mentioning

confidence: 99%

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Basic Oxygen Steelmaking Slag: Formation, Reaction, and Energy and Material Recovery

Spooner

et al. 2021

steel research int.

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“…The oxygen content method involves analyzing the air leakage rate of the sintering equipment system by detecting the oxygen content of the flue gas in the sintering flue. The oxygen content is detected by a zirconia analyzer, which is installed between the electrostatic precipitator and the bellows [37]. The principle of the calorimetric method is that the heat reserve change of exhaust gas leaving the system plus the heat loss of the system is equal to the heat of exhaust gas entering the system.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Air Leakage Rate of Sintering Furnace Based on BP Neural Network Optimized by PSO

Quan

Zhang

et al. 2022

Wireless Communications and Mobile Computing

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Aiming at the difficulty of air leakage detection in the sintering process of the sintering furnace, especially the problems of high detection cost and poor timeliness of detection results when traditional methods are used for detection, we propose an air leakage rate prediction algorithm. Firstly, we use the particle swarm optimization algorithm to optimize the initial parameters of the neural network based on back propagation and get the best set of initial parameters through continuous search. Secondly, the optimized parameters are substituted into the neural network to train them with training data, and the trained parameters are obtained. Finally, the air leakage rate of the test set data is predicted by using the trained parameters. Compared with traditional calculation methods such as gas analysis and calorimetry, the proposed method can greatly simplify the detection process, shorten the detection time, and control the error within 5%, allowing the user to deal with the air leakage problem more timely and improve the overall sintering quality.

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Crystallization Behavior of Liquid CaO-SiO2-FeO-MnO Slag in Relation to Its Reaction with Moisture

Bhattacharjee

et al. 2019

Metall Mater Trans B

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Effects of Slag Composition on H2 Generation and Magnetic Precipitation from Molten Steelmaking Slag–Steam Reaction

Abstract: Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.

Cited by 7 publications

References 34 publications

Basic Oxygen Steelmaking Slag: Formation, Reaction, and Energy and Material Recovery

Basic Oxygen Steelmaking Slag: Formation, Reaction, and Energy and Material Recovery

Prediction of Air Leakage Rate of Sintering Furnace Based on BP Neural Network Optimized by PSO

Crystallization Behavior of Liquid CaO-SiO2-FeO-MnO Slag in Relation to Its Reaction with Moisture

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