Theoxygencontent of atype 304molten stainless steel is normally controlled by silicon deoxidation. TheEAF-AOD-CCstainless steelmaking process has a feature of tapping with slag, since there is no extra tapping hole in an AODrefining vessel. The formation mechanism and the composition of non-metallic inclusions are therefore different from those ...
1 Zenith Steel Group Co., Ltd., Changzhou 213000, Jiangsu, China: Effects of ferrosilicon alloy, Si content of steel, and slag basicity on compositions of inclusions during ladle furnace refining of Al-killed steel: Jian‑fei Xu 1, Kun‑peng Wang 1, Ying Wang 1, Zhi‑dong Qu 1, Xing‑kuang Tu 1
12%Steel manufacturing produces a significant amount of different slags (10–15% by weight of the produced steel) (Proctor et al. 2000).It can be categorized as carbon steel slag and stainless steel slag (SSS) according to the type of steel, and as pretreatment slag, basic oxygen furnace slag (BOFS), electrical arc furnace slag (EAFS), ladle refining slag (LFS), and …
In stainless steel production, slag from argon oxygen decarburization (AOD) converters is dumped on to the ground and then slowly cooled. The slag undergoes phase transformation from β-dicalcium silicate (β-C2S) to γ-dicalcium silicate (γ-C2S) at approximately 500 °C to 450 °C, resulting in slag volume expansion, disintegration, and dust generation. The dusty slag leads to challenges in ...
Stainless steel dust is a solid waste and contains a large number of valuable Fe, Cr, and Ni metal oxides, which should be recovered efficiently. Through direct reduction and self-pulverization separation, the goals of high metal recovery ratios and grades in the new process of comprehensive stainless steel dust utilization were achieved.
Carlos Thomas, ... Francisco Agrela, in New Trends in Eco-efficient and Recycled Concrete, 2019. 7.1.2 Types and classification of steel slags. Steel slags (SSs) are usually classified according to the type of furnace in which they are produced. The properties of the slag depend on the type of process used to produce the crude steel, the cooling conditions of the slag and the valorisation process.
The carbonation degree of steel slag and RO phase increases with the carbonation time. Steel slag can react with CO 2 quickly in a short period of time (first 30 min), while RO phase hardly reacts with CO 2. Steel slag has high carbon sequestration ability, steel slag of 100 g can sequester more than 12 g of CO 2 within a few hours.
This work aimed to assess the possibility of stabilising argon oxygen decarburisation (AOD) stainless steel slag with CaO/SiO2 ~ 1.6, by using a secondary alumina by-product (~75 wt% Al2O3, referred herein as SA, found under the name "Valoxy®") and reduced levels of B2O3. Two groups of samples were synthesised: one reference group with AOD slag and 0.26, 0.16, 0.10 and 0.05 wt% …
2. Foundry-grade ferrochrome containing around 62-66% chromium and almost 5% carbon is used for producing cast irons. 3. Our good quality high carbon ferrochrome is used in the manufacturing of ball-bearing steels, tool steels as well as other alloy steels. 4. Ferrochrome alloy is also used when more chromium is needed to be added to carbon steel.
Considerably less slag is formed during speciality steel and ferrous alloy production. However, the amount of stainless steel slag, for example, still added up to 8.5 million tons in 2006 (Shen et al., 2004, ISSF, 2007).
This study reuses two types of stainless steel reducing slag with specific surface area of 1766 cm2/g (S1) and 7970 cm2/g (S2) in developing self-compacting concrete (SCC). Particularly, two S2 ...
Stainless steel slag is rich in Ca, Mg, Si, Fe, and other elements and has been used for soil improvement and as a fertilizer in agriculture (Wang and Cai 2006). Stainless steel slag is also potentially useful for remediation of heavy metal pollution due to …
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The chromium elution behavior of stainless steel (SS) slag depends highly on the chromium distribution, and the molten modification process proved to effectively improve the chromium enrichment in stable phases. However, the phase transformation and variation of chromium stability during the subsequent cooling process is still poorly understood.
Several studies 38 of steel slag in secondary applications will remain important.5 have investigated the stabilization potential of numerous com- 39 The presence of harmful elements such as Cr in stainless- pounds16,17,21,22 but recently, Kim and Hong22 confirmed that 40 steel slag,6,7 however, restricts the fields of application.
Portland cement, GGBS, steel slag and stainless steel slag as reported in different literatures. Compare to the oxide composition of OPC and GGBS, steel and stainless steel slags generally contain less lime (CaO), silica (SiO 2) and alumina (Al 2O 3), but contain more quantities of ferric oxides (Fe 2O 3) that cannot be
Abstract: The microstructural appearances of the slag of stainless steel electrodc and their influence on slag detachability have been studied by means of SEM., XRD. and optical microscope. It has been known that the dire ctivity and continuity of microstructural appearanccs of the slags are important factors of slag detaching; the free oxides and the fine crisscross structures are mainly ...
Examples of slags are steel slag, stainless steel slag, ladle furnace slag, and blast furnace slag; all of these residues have already been tested for agricultural use at some moment, as will be ...
The phase analyses of the stainless steel slags were reported in many articles (Li and Tsai, 1993, Lopez et al., 1997, Huiting and Forssberg, 2004, Tossavainen et al., 2007, Tang et al., 2008, Zhang et al., 2008, Ma and Garbers-Craig, 2009).Huiting and Forssberg have already made a systematic research about the physicochemical and mineralogical properties of the stainless steel slag which …
Recently, an oxidative (NaOCl) alkaline leaching method was developed in which V or/ and Cr can be extracted from a stainless steel slag (Spooren et al., 2016, Kim et al., 2016). Roasting process using a NaOH-NaNO 3 binary system as additives was used to treat vanadium slag for extraction vanadium and chromium in microwave heating furnace ...
One of the fastest growing categories of steel is in the stainless steel sector, including flat and long products. Its specific ferrosilicon consumption is 510 times higher than that of ordinary carbon steel. Special ferrosilicon grades such as low aluminum, high purity and low carbon iron silicon. Can be used to produce special steel.
The characteristics of stainless steel slag and the cycle process of chromium in the natural environment were introduced. Stainless steel slag is a kind of hazardous solid waste containing ...
Stainless Steel Slag on various proportions in Concrete (25% 50% 75% ). The basic objective of this study was to identify alternative source of aggregates and cement and to produce new type of concrete made of stainless steel slag as a green concrete. And to control the manufacturing
The stainless steel slag contains chromium and iron as well as significant levels of heavy metals, such as Cr(VI). Therefore, to efficiently recovery the valuable components in the stainless steel ...
Disintegration of AOD stainless steel slag can be effectively controlled by adding borax, and the adding amount is only 0.5% – 0.8%. This method can be easily industrialized.
Slag is the glass-like by-product left over after a desired metal has been separated (i.e., smelted) from its raw ore.Slag is usually a mixture of metal oxides and silicon dioxide.However, slags can contain metal sulfides and elemental metals. While slags are generally used to remove waste in metal smelting, they can also serve other purposes, such as assisting in the temperature control of ...
The stainless steel slag (SSs) come from the company Acerinox Europa S.A.U. located in Los Barrios (Cádiz), Spain. The SSs were processed in the laboratory, obtaining four different materials to be used in the manufacture of SCC (Figure 2): SSs (stainless steel slag dried in an oven for 24 h …
Silicon nitride is used in the production range of high-nitrogen steel, high-nitrogen alloy steel, high-strength steel, stainless steel, tool steel, and is also used in the defense industry, aerospace industry and insulation material industry. Granularity: 200 mesh-325 mesh, 1mm-50mm, can be processed according to user requirements.
Properties of ten-year-aged argon oxygen decarburization stainless steel slag: Ya-jun Wang 1,2, Ya-nan Zeng 1, Jun-guo Li 1, Yu-zhu Zhang 1,2, Wei Wang 1: 1 College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China; 2 School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
The evolution of non-metallic inclusions (> 10 µm) for the Al-killed steel in the stainless steelmaking is described. The effects of the slag basicity at the AOD/VOD process, Ca treatment, raw materials (dolomite and spent refractory), reoxidation and vacuum condition on the evolution of the non-metallic inclusion were investigated using the thermo-chemical program (FactSageTM) and ...