In this study, granulated blast-furnace slag was treated by wet grinding to promote its reactivity (i.e. WGGBS), and carbide slag (CS), one kind of industrial wastes, was used as the alkali. CS activating WGGBS system was designed, where the replacement ratio of WGGBS by CS was less than 10%.
The formation process of blast furnace slag is mainly divided into three steps: primary slag, intermediate slag, and tapped slag. (1) Primary slag. It is formed …
The GBSF temperature at the blast furnace output reaches about 1400 ÷ 1450 °C and it is cooled slowly by means of air or quickly by waterjet. The latter process is called granulation and leads to the formation of a product called granulated blast furnace slag (GBFS) and this form of slag is used in the composition of cement and concrete.
The transformation of steelmaking slag into a strong structural material through high gravity carbonation (Chang et al., 2012). Now known as the carbstone method (Quaghebeur et al., 2015), it consists of three steps: pre-treatment, shaping and curing. The BOS slag is first homogenized into a powder and then mixed with the appropriate …
For rational disposal of solid wastes, low-cost cemented paste backfills (CPB) were prepared with iron tailings, ground granulated blast-furnace slag (GGBS), and calcium carbide slag (CS).
The granulated blast furnace slag taken immediately after cooling in water, with water addition was mixed with waste slag dumped in landfill, which previously was crushed with a mortar grinder to ...
10.2.2 Blast furnace slag. Blast furnace slag (BFS) is a by-product from iron production in blast furnaces, which are fed by a mixture of iron-ore, coke and limestone. In the process, the iron ore is reduced to iron while all remaining materials form the slag, which is tapped off as a molten liquid and cooled.
Introduction: Metallurgical Slags - Royal Society of Chemistry. WebAug 4, 2021 Blast furnace slag may be recycled into the steel plant as a secondary source of Fe and as a pre-melted flux. 16 Furthermore, BOF slag can be recycled into the sinter and blast furnace process to recover Fe, and possible Mn, as well as being a source of fluxing …
1. Introduction. One of the main goals of solid waste management is to maximize its recycling and reusing ability (Hong and Li, 2011).Blast furnace slag (BFS) is the residue and solid waste from iron–steel metallurgical industry, whose storage not only occupies a large amount of land resources but also causes environmental pollution to the …
Industrial wastes, such as granulated blast-furnace slag (GGBFS) and coal FA, are widely adopted as complementary cementitious materials. MSWI FA shares certain characteristics of GGBFS and FA (such as chemical composition and heat history) but is inferior in performance [4]. The use of MSWI FA as a complementary cementitious …
Abstract. Alkali-activated slag with lower carbon emission exhibits a great potential as an alternative for Portland cement. The activity of slag and the base used …
Blast Furnace Slag is a nonmetallic byproduct from the production of iron. The Silicon Dioxide may contain trace amounts of crystalline silica. Slag may contain trace amounts of metallic chemicals present in the iron ore at less than 0.1 percent including: Iron oxide, manganese oxide, carbon, and zinc oxide.
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, …
Abstract. Ever-increasing energy costs and environmental restrictions have compelled researchers to focus on the reutilization of vast amounts of industrial by …
Blast-furnace slag and its derivative GGBS are examples of industrial byproducts that are primarily utilized as supplemental cementitious products in cement and concrete production. Its self-hydration feature, in addition to its pozzolanic action, distinguishes it from other compounds, which might be due to the presence of 30–40% …
The novel full-chain blast furnace slag utilization system was established to achieve the purpose of high quality waste heat recovery and high value-added utilization. The technical feasibility of the integrated system was judged by theoretical and experimental analysis. Meanwhile, the economic evaluation of the system was …
Blast furnace slag was about 50% of the tonnage sold and accounted for 88% of the total value of slag, most of which was granulated. Steel slag produced from basic oxygen and electric arc furnaces accounted for the remainder of sales. Slag was processed by 28 companies servicing active iron and steel facilities or reprocessing old
Life cycle assessment was conducted for the novel blast furnace slag utilization system. Two kinds of high value-added products of zeolite and hydrotalcite-like compounds were synthesized simultaneously. The net CO 2 emission was −6103.62 kg·t slag−1 and the economic cost was decreased by 250.80 $·t slag−1. The weaknesses of …
Slags, the obvious by-product of iron and steel making, have been piled up in different steel plants. Blast furnace (BF) slag finds almost use but there are …
The results show that the chemical composition of magnesium slag mainly includes 54.71% CaO, 28.66% SiO2 and 11.82% MgO, and the content of Al2O3 is much lower than that of granulated blast furnace slag. Compared to granulated blast furnace slag, magnesium slag has a larger relative bridging oxygen number and higher [SiO4] …
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At present, although the comprehensive utilisation rate of domestic blast furnace slag is more than 80%. However, the blast furnace slag treatment is …
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.
Duan et al. proposed a multi-stage blast furnace slag waste recovery system for effective recovery of the waste heat of blast furnace slag and they evaluated the environmental and economic impacts of the proposed method in comparison with OCP (water quenching-open circuit process and DSG (dry slag granulation) methods. ...
Ground granulated blast furnace slag (GGBS) is a by-product from the blast-furnaces used to make iron. Blast-furnaces are fed with controlled mixture of iron-ore, coke and limestone, and operated at a temperature of about 1,500°C. ... Cement paste and mortars were prepared using OPC, two types of grinding systems (inter-grinding and …
The blast furnace smelting process for vanadium titania-magnetite is shown in Fig. 1.The low concentration of TiO 2 with about 1.5 wt.% in the primary mineral can be enriched into titania-bearing slag with more than 20 wt.% TiO x, 29,30 as shown by the composition range in Table I; other oxides including CaO, MgO, SiO 2, and Al 2 O 3 are …
Consequently, construction waste aggregates and blast furnace slag can be used to improve the mechanical properties, workability, and chemical resistance of the conventional concrete mixtures. Since the construction waste and blast furnace slag wastes are available in vast amounts in Turkey, it is economically and environmentally …
Slag Granulation Systems Efficient blast furnace slag granulation contributes to low-cost hot metal and turns a residue into a resource. 10/116. A modern blast furnace can produce more than a million tons per annum of slag. Slag granulation using water sprays is now an established technology that not only simplifies blast furnace casting floor ...
However, blast furnace slag (BFS) with a large amount of heat more than 2000 ... System boundary of the slag disposal processes: (a) DSG method and (b) WQ method. The LCA is conducted in accordance with the methods presented by ISO 14041 [45]. Data related to input (raw materials, electricity, transport) and output (products, …
Blast furnace slag (BFS) is an industrial byproduct containing a sufficient amount (higher than 30%) of CaO and it can be used as a substitute for ordinary Portland cement (OPC). However, there have been few studies on the application of BFS for the treatment of radioactive waste from decommissioning processes.
The blast furnace (BF) slag waste heat was recovered by an integrated system stage by stage, which combined a physical and chemical method. The water and coal gasification reactions were used to recover the heat in the system. Based on the first and second law of thermodynamics, the thermodynamic analysis of the system was …
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 in …
In this paper, the slag granulation and heat recovery options are reviewed and given a critical evaluation, aiming to provide a basis for future directions in slag …
The terms blast furnace slag (BFS) and granulated blast furnace slag, as well as LD slag and electric furnace slag are used for finer distinctions. With high-quality iron ore grades with an iron content of 64 to 67 %, a blast furnace typically produces about 0.25 to 0.30 t of slag per t of pig iron.
Semantic Scholar extracted view of "Utilization of carbide slag-granulated blast furnace slag system by wet grinding as low carbon cementitious materials" by Junjie Zhang et al. ... For rational disposal of solid wastes, low-cost cemented paste backfills (CPB) were prepared with iron tailings, ground granulated blast-furnace slag (GGBS), …
Conclusions The laboratory-scale assessment of simulated blast furnace slag quenching (using mill service water versus blast furnace blowdown water) produced the following major findings and conclusions: 1) The level of particulate emissions is higher when the blowdown water (with a high total dissolved solids content) is used for quenching ...
The possibility of disposing of fly ash (FA) and blast furnace slag (BFS), which are environmental wastes, by using them as substitutes in portland cement was examined in this study. Portland cement (CEM I), FA, BFS, CEN standard sand, and water were used in the production of mortars. Blended cement …
Ground granulated blast furnace slag (GGBS) is a glassy by-product of hot metal production and has been used in blended cements for over 140 years [1,2,3,4].GGBS-containing binders and concretes have a lower CO 2 footprint, show a decreased heat development and an increased physical and chemical resistance [1, 3, 5,6,7,8].At high …
1.1.2 The Lhasa method (RASA) The Lhasa method (RASA) water granulated slag treatment system was developed by Nippon Steel Pipe and the British trading company RASA and was first applied on blast furnace No. 1 at Fukuyama Steel Works in Japan [Citation 4].The principle of the RASA method is that after the blast furnace slag …