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The Loma Baya complex in south-western Mexico is a volume of chromitite-bearing oceanic mantle that records a complex metamorphic history, defined by a first …
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The objective of this study is to investigate some of the parameters affecting the possible utilisation of Egyptian chromite ores for the production of high carbon ferrochromium. Pilot plant experimental heats were carried out to determine the optimum condition to get the highest recovery and metallic yield using the carbothermic smelting ...
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Examination of Sediment Dynamics Based on the Distribution of Silica Fluxes and Flood Sediments in the Otoishi River Related to the Northern Kyushu Heavy Rain Disaster, July 2017 Geosciences 10.3390/geosciences9020075
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According to Kadarmetov,' the silicon and carbon con-tents of the alloy depend on the quantity and quality of the lump chromite ore charged to the submerged-arc furnace and on the amount of ...
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Semantic Scholar extracted view of "The role of silica in the hydrous metamorphism of chromite" by V. Colás et al. Semantic Scholar extracted view of "The role of silica in the hydrous metamorphism of chromite" by V. Colás et al. ... The Loma Baya complex in south-western Mexico is a volume of chromitite-bearing oceanic mantle that …
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As an example, SiO 2 was employed as a flux in a number of investigations, [31,32,34,35,37,38] to lower the ore mixture smelting point and promote a combination of solid-and liquid-state pre ...
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Chromite ore is added along with a carbon-containing reducing agent and a flux, typically silica and then smelted in the SAF. This process is very energy intensive, …
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The reduction of carbon-chromite composite pellets with a silica flux was investigated at 1240-1410°C under an Ar-CO atmosphere. It was found that the effect of silica occurred …
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The reduction of chromite in the presence of silica flux [J] Minerals Engineering (2006) Y L DING et al. ... Yu and Paktunc (2019) applied the carbon component of SPL to reduce chromite and lower the ignition temperature instead of the original graphite. Flores et al. (2019) successfully used SPL to partially substitute …
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The behaviour of chromite during metamorphism has been recently documented (Colás et al. 2014(Colás et al., 2017(Colás et al., 2019González-Jiménez et al. 2015, 2016.
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Experimental studies on the smelting reduction of fluxed chromite pellets in Fe–C–Si melts were carried out at 1508–1590°C under an initial atmosphere of argon. The reduction was found to be favoured by high temperatures, high melt C contents and a high addition of lime or silica to the pellets.
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Silicon and oxygen dominate most magmas, with silica (SiO 2) comprising 40-80% of overall composition. At a fundamental level, we use the general terms ultramafic, mafic, intermediate, and silicic to describe rocks and magmas ranging from low silica-content to high silica-content. Silica content has a major effect on magma properties.
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Smelting Melting Refining Archives — Page 3 of 14. Silica is present in chromite ores as a basic silicate. In characterization and beneficiation studies performed on chromites at this Center, the chromiumsilica ratio determines the purity of …
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Experiments on the solid state reduction of cylindrical pellets made from graphite-chromite mixtures were carried out at 1000-1500°C under Ar-CO atmospheres. The reduction was favoured by high temperatures, small pellet size, and a fine particle size of reductant. The effect of reductant addition depended on its particle size. For pellets made with 1-2 μm …
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The reduction behavior of a natural chromite from the Bushveld Complex of South Africa was studied at 1300 °C to 1500 °C. Reduction was by graphite in the presence of silica. Thermo-gravimetric analysis, X-ray diffraction (XRD) analysis, energy-dispersive X-ray analysis (EDAX), and metallographic analysis were the experimental techniques used. …
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The effect of MgO/Al2O3 ratio on the reduction kinetics of chromite in MgO-Al2O3-CaO-SiO2-FeO-Cr2O3 slag system by carbon dissolved in high carbon ferrochromium alloy melts was investigated.
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NEUSCHUTZ D, JANBEN P, FRIEDRICH G, WIECHOWSKI A. Effect of flux additions on the kinetics of chromite ore reduction with carbon [C]//INFACON 7. Trondheim, Norway: FFF, 1995: 371âˆ'382. [11] WEBER P, ERIC R H. The reduction of chromite in the presence of silica flux [J]. Minerals Engineering, 2006, 19: 318âˆ'324. [12]
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Ferrochromium produced by smelting chromite ores is an important alloying component in the steel industry. Ore, coke and fluxes are mixed and reacted in an arc furnace for a smelting process of ferrochromium. In addition to this process, pre-reduction of chromite ore with carbon is an important industrial process. In all these processes, the …
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Tao JIANG [email protected] School of Minerals Processing & Bioengineering, Central South University, Changsha, Hunan 410083, China. Search for more papers by this author
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The Bushveld Igneous Complex (BIC) is known for its laterally extensive platinum group element–bearing layers, the most famous being the Merensky Reef and the UG-2 chromitite in the eastern and western limbs of the complex. In the northern limb, the Platreef mineralization and a thick chromitite seam below it (referred to as the "UG-2 …
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Chromite ore is added along with a carbon-containing reducing agent and a flux, typically silica and then smelted in the SAF. This process is very energy intensive, requiring 4 MWh per tonne of ferrochrome alloy produced. ... The reduction of chromite in the presence of silica flux. Miner Eng 19(3):318–324. Article CAS Google Scholar ...
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In 1993, the two-stage reduction mechanism for chromite with carbon was established by Weber [39]. Results show that the first stage was confined to iron …
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Weber et al. [14] [15][16] investigated the effect of silica addition on the reduction of chromite ore. They found that silica affected the reduction at and above 1 …
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In 1993, the two-stage reduction mechanism for chromite with carbon was established by Weber [39]. Results show that the first stage was confined to iron metallization; the second stage was primarily confined to chromium metallization. ... The reduction mechanism of chromite in the presence of a silica flux. Metall Trans B, 24 …
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Diamond is a typical UHP mineral that forms at depths >150 km (~5 GPa) and is commonly found in certain types of volcanic rocks (for example, kimberlites, …
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Effect of silica concentration on degree of sintering of chromite-silica ladle well filler sand based on South African raw materials. 2022, Journal of the Southern African Institute of Mining and Metallurgy ... Reaction mechanism between the carbon bonded magnesia coatings deposited on carbon bonded alumina and a steel melt. Journal of the ...
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A 1:1 mixture of tungsten and iron chips was used as the accelerator flux. Elemental carbon and sulphur analyses of the two clays were similarly conducted utilising a LECO CS 230 IR spectrophotometer. ... The reduction of chromite in the presence of silica flux. Minerals Engineering, 19 (2006), pp. 318-324. View PDF View article View in …
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Smelting of high-carbon ferrochrome from chromium agglomerate produced with alumina-silica flux. January 2017; Steel in Translation 47(1):65-69 ... Production of chromite pellets for smelting the ...
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Abstract Sol-gel technique was used to prepare silica-supported copper chromite catalyst from acid hydrolysis of sodium silicate. The catalyst was characterized by BET surface area, FESEM, XRD, H2-TPR and pyridine adsorption by FTIR. The catalyst was activated in a hydrogen atmosphere based on H2-TPR result. The surface acidity of …
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low silica content • pH and Acid Demand Value - important tests in predicting issues with curing and strength development in chemical binder systems • LOI- Loss on Ignition - can be used to look for accessory minerals and impurities associated with the chromite sand. • Turbidity- an indicator of the cleanliness of the chromite sand
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