Comparative Analysis of Steel Slag Characteristics and Treatment Process
TL;DR: In this paper, steel slag is used in hydraulic cementing material, which is mainly applicable approach to the production of cement, admixture of high performance concrete, road engineering.
Abstract: Steel slag is hydraulic cementing material, which is mainly applicable approach to the production of cement, admixture of high performance concrete, road engineering. But as a result of hydration expansion of the free calcium oxide and free magnesium oxide and dicalcium silicate morphological changes which is contained in slag cause poor stability of steel slag used in engineering, the steel slag utilization is very low. Therefore, the key technology of steel slag treatment process is to improve the stability of steel slag. Steel slag is alkaline slag, with lower temperature, the viscosity increases sharply, the liquidity variation, it is one of the important factors affect the steel slag processing, According to the need for different liquidity of steel slag to choose the corresponding steel slag treatment technology. Tank-type hot disintegrating, Rotary cylinder technology processing available to small particle size, good steel slag separation, active promotion of slags, conducive to the comprehensive utilization of steel slag.
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01 Jan 2016
TL;DR: In this article, the basic technical requirements for aggregates, asphalt mixes, and pavement, and summarizes the experience of using slag in asphalt mixes and paving are presented. But the use of slag is not limited to asphalt mixtures.
Abstract: Asphalt mixtures contain asphalt binder and graded aggregates. Since the early stage of using blast furnace slag and steel slag in hot-mix asphalt considerable experience has been accumulated through mix design, production, and construction. Quality control and technical specifications have been well developed to ensure the quality of steel slag asphalt concrete, minimize potential expansion, and take advantage of the positive features of high stability, skid and rutting resistance, and antistripping. In recent years new materials and construction techniques have been developed, such as warm-mix asphalt, cold in-place recycling, and various surface treatment methods that provide a broad platform to develop novel uses of ferrous, nonferrous, and nonmetallurgical slag aggregate products. This chapter introduces the basic technical requirements for aggregates, asphalt mixes, and pavement, and summarizes the experience of using slag in asphalt mixes and paving.
9 citations
TL;DR: In this paper, the authors reviewed the research progress in catalytic fields such as catalytic pyrolysis, organic degradation, electrocatalysis, photocatalysis, transesterification, and carbon capture and storage, as well as the modification methods of steel slag.
Abstract: As a by-product of the iron and steel industry, steel slag is rich in catalytically active substances and can therefore be used as a solid catalyst. Many studies have shown that the application potential of steel slag in catalysis is huge, which provides new development space for its application, thereby increasing its additional utilization value. This article primarily reviews the research progress in catalytic fields such as catalytic pyrolysis, organic degradation, electrocatalysis, photocatalysis, transesterification, and carbon capture and storage, as well as the modification methods of steel slag. The catalytic performance of the modified steel slag has been further improved, and it has the meaningful characteristics of high efficiency, cleanliness, and low costs.
8 citations
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01 Jan 2016
TL;DR: In this paper, the intrinsic properties of slag, and the evaluation and processing of slags are discussed, as well as their application in construction applications, and their properties are evaluated.
Abstract: Slag is regarded as a by-product after it is separated from base metal or element in smelting furnaces or discharged from coal-firing boilers or municipal solid waste incinerators. Unlike normal primary product production in which the final required properties are carefully designed and adjusted during the production to meet the final products’ specifications, slag is produced with less consideration about its further use in construction applications. Its property is most likely to fluctuate. The inherent nature of slag and variation in chemical and mineral composition lead to variation of physical and mechanical properties of slag. To convert slag into useful and quality slag products for selective uses, processing and special treating are critical and inevitable. This chapter outlines the intrinsic properties of slag, and the evaluation and processing of slag.
4 citations
14 Jun 2021-Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science
TL;DR: In this article, a three-stage heat exchange was proposed to recover the heat energy in high-temperature molten steel slag through mass balance and energy balance, and the theoretical heat recovery rate reached 81.42% when the waste heat stored in steel slags was converted into usable heat energy and the exergy efficiency of the overall system was 27.93% when used for cogeneration.
Abstract: High-temperature molten steel slag is a large amount of industrial solid waste containing available heat energy and resources. This paper introduces an efficient and comprehensive utilization process of high-temperature molten steel slag. The waste heat energy in the high-temperature molten steel slag can be fully recovered through the three-stage heat exchange. 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 usable heat energy, and the exergy efficiency of the overall system is 27.93 pct. When the waste heat stored in the steel slag is converted for electric energy, the theoretical heat recovery rate can reach 24.49 pct, and the exergy efficiency of the overall system is 33.83 pct. When the waste heat stored in steel slag is used for cogeneration, the theoretical heat recovery rate can reach 83.98 pct, and the exergy efficiency of the overall system is 38 pct. The normal-temperature solid steel slag produced by the process is easy for iron selection and subsequent high value-added utilization. The solidification of steel slag in this process consumes a large amount of CO2 so that the free calcium oxide (f-CaO) in the steel slag is fixed, which is more conducive to subsequent utilization, thereby achieving the purpose of energy saving and emission reduction. Compared with the utilization of traditional steel slag, this process can better utilize the energy and resources contained in steel slag and provides a new method for fully utilizing the waste heat energy and resource attributes of high-temperature molten steel slag.
3 citations
Journal Article•
TL;DR: In this paper, the first industrial installation for liquid slag treatment by rotary cylinder in the world was put into operation in the 250t BOF shop at Baosteel and the result of two year's operation indicates that the technology is superior to other methods in terms of procedure, the stability of the slag after treatment,environment protection and construction investment, etc.
Abstract: After the three year's assimilation and innovation of the Russian laboratory scale patent,the first industrial installation for liquid slag treatment by rotary cylinder in the world was put into operation in the 250t BOF shop at Baosteel.The result of two year's operation indicates that the technology is superior to other methods in terms of procedure,the stability of the slag after treatment,environment protection and construction investment,etc.The facility constitution and production result of this system are described in the paper.
1 citations
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TL;DR: In this paper, the physical and chemical characteristics of steel slag were analyzed and then the research progress of slag utilization at home and abroad as recycled raw material in steel enterprise interior, aggregate of road and hydraulic construction, cement additive and concrete admixture, materials for waste water or gas treatment, construction materials and fertilizer in agriculture production.
Abstract: The current utilization rate of steel slag is only 22% in china, far behind the developed countries. At present, the amount of slag deposited in storage yard adds up to 30Mt, leading to the occupation of farm land and serious pollution to the environment. Improving the slag utilization is an important way to resolve these problems. The physical and chemical characteristics of steel slag were analyzed and then the research progress of steel slag utilization at home and abroad as recycled raw material in steel enterprise interior, aggregate of road and hydraulic construction, cement additive and concrete admixture, materials for waste water or gas treatment, construction materials and fertilizer in agriculture production were introduced respectively. At last, the important routes and critical problems for large-scale utilization of steel slag were proposed.
503 citations
TL;DR: Wang et al. as mentioned in this paper explored the feasibility of utilizing steel slag as aggregates in stone mastic asphalt (SMA) mixtures, and properties of such asphalt mixtures were evaluated as well.
336 citations
"Comparative Analysis of Steel Slag ..." refers background in this paper
...K < 1, RO phase belongs to the hardness of solid solution, MgO does not affect the stability of steel slag [8,9,10]....
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TL;DR: It is experimentally proved that certain volume expansion of steel slag can be absorbed internally by the void volume in bulksteel slag under external surcharge weight making the apparent volume expansion equal zero.
282 citations
TL;DR: In this paper, the usability of Basic Oxygen Process (BOP) slags of Kardemir Iron and Steel Plant, Karabuk, Turkey as an additive into cement was investigated.
209 citations
TL;DR: Tests on volume stability of fresh materials confirmed that a period of 2-3 months is necessary to reduce effects of oxides hydration and the leaching tests provided satisfactory results.
155 citations