The results show that the transformation process of molten steel slag released more than 80% heat in 2 s under conditions that the initial temperature of slag was 1823 K, the diameter of slag was 1–3 mm, the temperature of cooling gas was 373 K, and the flow velocity of cooling gas was 1–20 m s −1.
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Polettini et al. conducted a study of the effect of pressure during the direct aqueous carbonation process using water (at a ratio of 5 L/kg) to enhance the …
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Carbon dioxide sequestration using steel slag—modeling and experimental investigation. Smitha Gopinath, Anurag Mehra, in Carbon Dioxide Sequestration in Cementitious Construction Materials, 2018. 4.1 Introduction. Steel slag is an industrial waste that is generated during the production of steel. In the production of steel, oxides of metal …
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As shown in Fig. 2.2, the higher the direct reduction temperature, the smaller ΔG Ө, indicating that the reduction reaction is more likely.Fe 3 O 4 in copper slag can be easily reduced to metallic iron, and Fe 2 SiO 4 can also be reduced to metallic iron when the direct reduction temperature is higher than 1036.7 K. If CaO is added in the direct …
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ISC process: The molten slag is poured into a steel box in which it solidifies and then subjected to water sprinkling and immersion cooling. Rapid cooling process: The molten …
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Application of electromotive force between molten iron–carbon and slag is shown to decarburize iron. Electrorefining decarburizes by direct interfacial electrochemical reaction, resulting in low ...
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The specific process flow is shown in Fig. 5. Download: Download high-res image (385KB) Download: Download full-size image; Fig. 5. PanSteel clean production process flow chart. PanSteel Group applies the clean production process from converter vanadium-containing slag to vanadium oxide. The flow chart is adapted from Qiu et al. …
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Slag management is an extremely important issue because at elevated temperatures (>1200°C), slag is a universal solvent, and often serves as the sink for contaminants. This prevents tramp elements in the internal recycling streams from building up in the refining process. Lead is reclaimed from slag by reduction with iron.
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Steelmaking plants continuously strive to reduce the environmental load in the steelmaking process, resulting in the recycling of energy, water, and other byproducts. In this chapter, techniques for the treatment and recycling of metallurgical slags are described. Metallurgical slags are considered secondary raw materials and are used or …
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Conventionally, little chemical adjustments are made to the slag prior to its processing for subsequent use or disposal. However, recent attempts have looked into modifying the chemical composition of slag while hot, to render its chemistry and properties suitable for high-value products or recovery of minerals/metals from slag [11, …
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In both processes, water is present (by desire for cooling and dispersion or as a result of rain accumulation) and thus equipment and operations are designed to …
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The smelting process of blast furnace is carried out in the shaft furnace of a closed countercurrent reactor and heat exchanger. The complex physical changes and chemical reactions are completed in the process of the countercurrent movement of the charge and gas in which the raw materials containing iron oxide (sinter, pellets, etc.), …
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It separates the slag from metal by allowing the slag leave from the top into slag runner as slag has low density than molten iron. The iron passes through a passage in the skimmer at the bottom. Thus, extensive interaction and sever corrosive environment affect the trough refractory that demands excessive care for interruption and continuous ...
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Blast furnace slag can be processed into the following materials by various processes. In China, blast furnace slag is usually processed into water slag, slag gravel, expanded slag and slag beads.Water slag is the process of putting the hot-melt blast furnace slag into water for rapid cooling, which mainly includes slag pool water …
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The iron/steel slag processing flow is schematically shown in Fig. 2. Steelmaking slag is subjected to the following four process-es: ① solidify and cooling of the hot molten slag, …
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Blast furnace slag is a by-product of the iron-making process while producing pig iron. 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 iron making process through the blast furnace route.
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Many restrictions exist, however, on the utilization of steel slag. When steel slag is used internally, in steel plants, the most obvious problem is that of the enrichment of P and S (Drissen et al., 2009).The Bhilai Steel Plant in India was shut down because of its high S and P content (Das et al., 2007).The amounts of free lime and free MgO are …
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2.2 Properties of iron/steel slag Iron/steel slag is composed mainly of CaO and SiO 2. In addition, blast furnace slag contains Al 2 O 3, MgO, and S, and steelmaking slag contains iron oxides (FeO, Fe 2 O 3), MnO, P 2 O 5, etc. Steelmaking slag includes the following: slag produced in the hot-metal pretreatment processes (desiliconization ...
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Dewatering Process The granulated slag and water mix is distributed evenly over the whole length of the drum. Axial vanes inside the drum continuously lift the slag sand onto a conveyor belt for immediate evacuation. The fine mesh on the exterior of the drum retains the slag sand and allows the water to filter through. The slag
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11ügranulated slag Figure 2. INBA process. 4 Dry granulation process On the blast furnace slag treatment technology, for a long time, water quenching process has token the leading position. However, there are many defects of water-quenching slag method, which can be roughly concluded as follow: a mass of sensible heat unrecovered, high
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The complete utilization process of steelmaking slag has been developed, in which Fe and P were recovered and slag products such as cement or aggregates, phosphate …
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A complete slag composition modification for preventing C2S phase transformation can be achieved by adding a large quantity of SiO 2 or its sources, such as fayalite slag, quartz, fly ash, soda glass, foundry waste sand, and waste silica refractory brick 50-52. Pontikesh et al. 50 utilized fly ash to stabilize LF slag.
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Therefore, many researchers added grinding or selective reduction processes before starting beneficiation. Yang and Yu used a multi-stage grinding, subsequent roasting, and flotation method to recover iron from copper slag. The process flow chart is shown in Fig. 4. When the copper slag grinding fineness was 0.074 mm, the roasting temperature ...
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Fig. 3 shows the process flow diagram of the 40 kg/hr (dry basis) OMB entrained flow gasification system used in this study. It includes a feed preparation system, the four-burner OMB gasifier, and a syngas cleaning system. ... is a key parameter to understanding slag transformation due to its influence on the valence state of the iron in …
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lator to granulate the slag, and the slag-water ratio (1:1). It is far lower than the slag-to-water ratio (5:1) of the high-pressure water granulation slag of the INBA method, and the process equipment is simple, the water consumption is small, the operating cost is low, the slag with iron content is less than 40%, and the
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Water consumption (Slag/Water) Slag moisture content% Area covered Investment Application Situation of Domestic Steel Mills Bottom filtration method 8 1:10 24-40 Maximum Relatively large Maximum INBA method 5 1:(6-8) 15 Medium Maximum Many TYNA method 2.5 1:8 8-10 Medium Large Relatively large RASA method 15~16 1:(10 …
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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 …
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1 Introduction. The basic oxygen steelmaking (BOS) process produced over 70% of the global crude steel in 2018, [] 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 …
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High-temperature waste heat from the iron and steel industry, as shown in Fig. 1, are mainly stored in products, molten slag and waste gas [2].Molten slag, as a kind of by-product during the steelmaking process, is exhausted in extremely high temperature and thus, it carries a great deal of high-grade heat accounting for 10% of waste energy …
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bility of putting this complete utilization process to practical use. Figure 1 illustrates our intended process. Steelmaking slag is sup-plied to the reduction process along with carbon materials and slag modifiers. The reduced slag is used in the same way as blast furnace slag. Meanwhile, hot iron in which iron and phosphorus were en-
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