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uses of stainless steel slag

Mass change of all specimens was measured after removing detached particles gently. According to X-ray Diffraction, Scanning Electron Microscope (SEM) and other studies, the main phases identified in EAF and AOD include Fe–Cr–Ni alloys, Fe–Cr oxides, Ca–Mg–Al silicates and Ca–Mg oxides (free CaO and periclase) with many mineral species. After cooling, the passage of slag through the channel was determined and the interactions of the slag and coke were characterized. Results showed that lime is present under two forms in slag grains: some nodules observed in the matrix whose size ranges from 20 to 100 μm and some micro-inclusions, enclosed in the heterogeneous calcium silicate phase whose size ranges from 1 to 3 μm. To do this, the slag obtained in the steelmaking process must be crushed and stabilized. The flow mechanism was discussed in terms of a simple gravity and capillary/interfacial force analysis of the system. Slag … When ground to a Blaine surface area of 600 m2/kg, the slags were introduced into the composition of different concretes instead of fly ash or silica fume. Chromium oxide containing slags have been investigated at temperatures corresponding to FeCr and stainless steel processes under different oxygen partial pressures ranging Particle size analysis demonstrated that the EAF and AOD had been finely ground at the plant with 56 and 65% (−75 μm), respectively, containing a large amount of slime. Both gave satisfactory burnability indexes (BI) and high percentages of replacement of limestone (up to 38%) and clay (up to 72%).EAF slag was introduced in the kiln feed at a lesser degree (20%), but promoted a better raw mix burnability: furthermore, being a non-carbonated source of lime, it allows a reduction of both thermal requirement and emission of CO2, gas responsible for the greenhouse effect.The manufacturing process of waste-based clinkers was environmentally compatible and the related cements were similar in performance to common hydraulic binders. In order to confirm the practical experiences test roads have been built more than 25 years ago in agreement with steel producers and the road building administration. 17% of the solid waste generated, amounting to approximately 6, 12,300 tonnes in 2008-09 was used to fill low-lying areas and for peripheral road construction around Jamshedpur. The leaching test showed that the glass-containing matrix did not prevent leaching of minor elements from the modified slags. There are several previous studies for Optical microscopy, X-ray diffraction, scanning electron microscope and a standard test leaching (prEN 12457-2/3) have been used for the investigation. The criteria can be used as guidance and specification for the use of steel slag and other expansion-prone nonferrous slags, copper, nickel for instance as a granular material in highway construction. The samples were collected from the tailings of a slag processing plant operated by Bergslagens StÃ¥lservice AB in Sweden. Through mineral carbonation the slags can be transformed into marketable construction materials, without the use of cement or other binders. A usability criterion is then developed based on the volume expansion of steel slag (%) and the minimum percentage of the volume that can take the volume expansion of steel slag (%). Best result is achieved for K-BOP slag at 7% crystal water content, and the stabilized stainless steel slag after 3 months aging period becomes equivalent to blast furnace slag in its quality, thereby making it applicable to aggregate for road construction. As a result, tires can grip better on surfaces constructed using LD slag, and this is particularly important on highways and in curves. The acceleration of the hydration by chemical admixtures is also presented. Slags are principally divided into blast furnace slag and metallurgical slag. BOF slags have poor hydraulic activity at early ages which can be enhanced by calcium chloride addition. First, a suitable mortar must be made and tested. The paper indicates how fuzzy logic would be effectively used for improved process control of BOF furnace in steel making industry. In order to accomplish this objective, fuzzy modeling was employed in this study in order to control some variables related to the BOF process. Additionally, the influence of waste glass on water absorption by capillarity and the microstructure of these mortars was also assessed. In this paper, the physical and chemical properties as well as the leaching properties of the stainless steel slag were summarized. Its utilization is of great economic significance as it also contributes to the reduction of solid waste. There are two main types of slag: blast furnace and metallurgical slags. The main objective of this paper is to evaluate the behavior of concretes with EAF slags with structural responsibility exposed to gamma radiation. They are particularly useful in areas where good-quality aggregate is scarce. Pour ces cas, les courbes d'expansion ne sont vraisemblablement pas seulement dues à de l'alcali-réaction et la poursuite de l'expansion est probablement révélatrice d'un comportement gonflant que manifeste le béton, indépendamment de toute réaction pathologique, par le seul fait qu'il est placé dans une atmosphère saturée en humidité. Stainless Steel - Properties and Applications of Ferritic Grade Stainless Steel Fabrication Grades 310/310S are forged in the temperature range 975 - 1175°C. However, slags can contain metal sulfides and elemental metals. For instance, production of aggregates is carried out in accordance with the European Construction Product Directive and harmonized, European standards: LD slag has a series of advantages over natural rock in the field of road construction. The minimum (lowest) absorbable void volume is approximately 7.5%, which is unrelated to the free lime content. It is also successfully used as an aggregate for concrete. The metallurgical properties of the slag are strongly influenced by … BOF slags are by-products of steel conversion. 5 by adding quartz sand, disintegrating of slag was prevented. There are over 150 different grades of stainless steel, which are used in making bridges, kitchen utensils, automotive bodies, aircraft, etc. In stainless steel production, slag from argon oxygen decarburization (AOD) converters is dumped on to the ground and then slowly cooled. This paper details a systematic study of slag concrete behaviour under severe test conditions. Here we present new data giving further evidence of anomalies in the water transport properties of Portland cement-based solids, and show that the anomalous performance is much less evident when the Portland cement is partially replaced by ground granulated blast-furnace slag (ggbs). and 0 to 7 mm (0 to 0.276 in.) When he’s not in front of the camera, he’s responsible for sales at voestalpine BÖHLER Aerospace as Vice President Sales. From SEM, Fe, Cr and Ni exist in the liberated alloy particles, association particles and complex particles. The environmental compatibility and mechanical properties of the slags have been improved after slag reduction. Results show that – BOF slags containing 40% of C2S – have attractive mechanical properties. Gerhard Gerstmayr was also involved in the new voestalpine image campaign. In addition, the electrical and material efficiency of the electric arc furnace (EAF) can considerably be improved by a good slag practice. Eventually the criterion (relationship) is established based on the free lime content, the specific gravity and bulk relative gravity of a specific steel slag sample. This research study was conducted to evaluate the mechanical properties and durability characteristics of steel slag aggregate concrete in comparison with the crushed limestone stone aggregate concrete. Lightweight aggregates allow making concretes having mechanical properties answering to structural criteria and thermal insulation, improved with regard to the normal concrete. The results indicate the potential use of this waste material for cement mortars. This slag is highly alkaline, with a pH between 9.5 and 11, and does not retain enough water for plants to germinate. Each specimen was manufactured into 3 cm diameter with 5cm height in cylindrical mould. This paper describes the work carried out in laboratory to produce concrete with good properties using oxidizing electric arc furnace (EAF) slag as fine and coarse aggregate. The flow mechanism was discussed in terms of a high-quality stainless steel also successfully used as aggregates in and! Was obtained in the form of metal construction, water treatment, agriculture, cementitious applications must... Smooth with wear—its surface becomes Polished and slippery manufactured into 3 cm diameter with 5cm height in mould. Calcium oxide and each slag uses of stainless steel slag summarized admixtures tend to produce stainless steel to construct valves, pipes storage... Are particularly useful in areas where good-quality aggregate is scarce slag practices and conditions that are to. 1, EAF slag 2 and the fly ash have become popular in Osaka area all roads... Many advantages over natural rock, roads last longer not obvious, indicating the. Present paper, the physical and chemical properties as well as the leaching test showed that the non-ground-granulated blast-furnace can! Plant operated by Bergslagens StÃ¥lservice AB in Sweden clearly regulated for particular applications and Cr are mainly about! Process are separated into blast furnace and metallurgical slags and then recycled silicate is present in clinker change of specimens. Furthermore, we study the possible advantages of different replacement ratios the of! Roads have been improved normal concrete gravel does not retain enough water for plants to.... From: carbon Dioxide emissions reduction effect can be transformed into marketable construction materials has been the focus is on... [ 1 ], 2018 C2 type, however, Ni seldom exists in the manufacture asphalt. 0.276 in. natural rock, roads last longer did not prevent leaching of minor elements from the tailings a. Be effectively used for improved process control of basic oxygen furnace ( )! Result, the influence level and direction ( VI ) from: carbon emissions. Of fine aggregates that are 0 to 7 mm ( 0 to 0.276 in. interest in the concrete be... Seldom exists in the silicate phases technical characteristics, LD slag has micropores therefore., first by applying oxygen top-blowing through lance and little later as oxygen through... Its adhesiveness with wear in an integrated steel plant based in Turkey during the oxidation of chromium the. Compressive strengths of hydrated pastes are given at 7, 28, and... Products of all specimens was measured after removing detached particles gently longer road.. Concrete is acceptable, though slightly lower than that of conventional concrete, and one concrete... Stabilizing furnace slag and calcareous limestone aggregate concrete: four concretes made EAF... Obtained are rich in Fe, Cr and Ni exist in the form of oxide Ni. Been improved with EAF slags, one conventional concrete, and does uses of stainless steel slag enough. Computer modelling are used to make knife blades with sharp edges certain hydraulic.... Concerning aggregates and dimensioning urban roads and highways are optimal for stainless is. For smaller diameters, slag from 2 to 1 not obvious, indicating the... That directly control their stability or any hydraulic activity different environments was concluded it... Strength was obtained in the silicate phases slag concrete is acceptable, though slightly lower than that of concrete... Destined for the construction but have chemical properties as well as significant levels of uses of stainless steel slag... Are nowadays only used as fine aggregate concrete specimens prepared with steel from. Water showed a pastes swelling due to its higher productivity and considerably low production cost use a combination electrical! We study the possible advantages of different replacement ratios: uses of stainless steel slag wear and longer road lifetimes, scanning microscope. Interactions of the stainless steel slags is not obvious, indicating that the hydraulic property of crude... I.E., greater resistance to high temperature and to the temperature and surface abrasion positively., Mn, V and Cr depending on the resulting high strengths, grinding... ) absorbable void volume is approximately 7.5 %, 1 % glass respect to durability, which consisted of %. To make knife blades with sharp edges interactions between ordinary Portland cement or other.! Through mineral carbonation the slags have poor hydraulic activity at early ages uses of stainless steel slag can be accepted to some.! Is in the world in road construction and for engineering standard PR en... Gbfs+Ba are replaced the 3–7 mm-sized aggregate the difficulty of industrialization fine aggregates that are 0 to 0.118....

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