آخرین محصولات
The reduction mechanism of chromite in the presence of …
1500 ~ the presence of a silica flux, and a large excess of reductant. The solid-state carbothermic reduction mechanism and kinetics of a natural chromite from the LG-6 …
Catalytic reduction of carbon-chromite composite pellets by …
Semantic Scholar extracted view of "Catalytic reduction of carbon-chromite composite pellets by lime" by Y. L. Ding et al. ... The reduction mechanism of chromite in the presence of a silica flux. P. Weber R. H. Eric. Materials Science, Geology ... Reduction was by graphite in the presence of silica. Thermo-gravimetric … Expand. 35. Save.
The reduction of chromite in the presence of silica flux
The results show that the reductivity of carbon-bearing chromite pellet is greatly influenced by the reduction temperature and C/O mole ratio.
Kinetics of solid state silica fluxed reduction of chromite …
Solid state reduction of an Australian chromite with black coal and silica addition was studied thermogravimetrically in the temperature range 1000–1400°C under an argon atmosphere.
Kinetics of the reduction of bushveld complex chromite ore …
The kinetics of the reduction of chromite ore from the LG-6 layer of the Bushveld Complex of the Transvaal in South Africa were studied at 1416 °C by the thermogravimetric analysis (TGA) technique. Spectroscopic graphite powder was employed as the reductant. The aim of this article is to present a kinetic model that satisfactorily …
The reduction of chromite in the presence of silica flux
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
Ferrochrome
The raw materials used are chrome ore, coke, and silica. High-quality metallurgical grade ... Most of the high-carbon ferrochrome with high-chromium content is smelted in a submerged arc furnace using flux method. ... ferrochrome) are usually smelted by electro-silicothermic reduction method with raw materials including silicochromium, …
Carbothermic smelting of high carbon ferrochromium alloy from …
Samples were also smelted in an induction furnace at 1750 deg C using limited silica flux additions and reductant to produce a high carbon ferrochrome alloy with chromium contents of around 65 to 70%.
Smelting characteristics of fluxed chromite sinter and its …
It uses suitable fluxes and coke breeze as heat source to raise temperature up to 1600°C and produces a semifused mass (20% molten phases) with good strength. …
Effect of Chromite-Silica Sands Characteristics on
Request PDF | Effect of Chromite-Silica Sands Characteristics on Performance of Ladle Filler Sands for Continuous Casting | Free opening rate is mainly determined by the performance of the ladle ...
Mechanism of the Direct Reduction of Chromite Process as a …
Direct reduction of chromite (DRC) is a promising alternative process for ferrochrome production with the potential to significantly reduce energy consumption and greenhouse gas emissions compared to conventional smelting. In DRC, chromium (Cr) and iron (Fe) from chromite ore incongruently dissolve into a molten salt, which facilitates mass …
Catalytic reduction of carbon-chromite composite pellets …
The carbon-chromite pellets are used in this was insulated by various layers of refractory. ... Kinetics and mechanism of the the microstructures and oxidation of the divalent iron reduction of carbon-chromite composite pellets with a silica flux (1996) for publishing. to the trivalent state (thereby enhancing the chromite [101 N.A. …
Minerals | Free Full-Text | An Overview of Currently Applied …
Ferrochrome (FeCr) is the main source of chromium (Cr) units used in modern-day chromium (Cr) containing alloys. The vast majority of produced Cr is used during the production of stainless steel, which owes its corrosion resistance mainly to the presence of Cr. In turn, stainless steel is mainly produced from Cr-containing scrap …
Effect of Chromite-Silica Sands Characteristics on
Free opening rate is mainly determined by the performance of the ladle filler sand. High free opening rates of ladles are required in steel making to improve steel quality. Chromite ladle filler sands are one of the most widely used ladle filler sand. Several operative variables and materials characteristics affect the performance of the sands. …
chromite silica carbon flux
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 …
The reduction mechanism of chromite in the presence of a …
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 …
Carbothermic reduction of chromite fluxed with aluminum …
The formation of low melting point slag could potentially promote the carbothermic chromite reduction and enhance the growth of ferrochrome alloys at lower …
The reduction of chromite in the presence of silica flux
The mechanism and kinetics of the carbothermic reduction of a natural chromite was studied at 1300–1500 °C in the presence of silica. Thermogravimetry, X-ray diffraction (XRD) analysis, energy dispersive X-ray analysis (EDAX) and metallography …
Review on Preparation of Medium- and Low-carbon Ferrochrome …
Reduction Temperature. Xu et al. [] studied the spheronization and reduction catalysis of carbon-containing chrome ore and studied the effect of reduction temperature on the metallization rate.Zambrano et al. [] analysed the effects of reduction temperature and excess reducing agent on ferrosilicon using raw materials (chromite, petroleum …
The reduction mechanism of a natural chromite at 1416 °C
The behavior of a natural chromite from the Bushveld Complex, Transvaal, South Africa, during reduction at 1416 °C by graphite was studied by means of thermogravimetric analysis, X-ray diffraction (XRD) analysis, energy-dispersive X-ray analysis (EDAX), and metallographic analysis. Experimental runs were allowed to …
[PDF] Carbothermic Reduction of Synthetic Chromite …
Carbothermic reduction of chromite is an important industrial process for extracting chromium from the chromite. ... Synthetic Chromite was prepared and reduction studies were carried out with different amounts of carbon in the mixture in the temperature range 1150-1300°C. ... The reduction of chromite in the presence of silica flux. P. …
Thermodynamic Modeling of the Solid State Carbothermic Reduction …
Traditionally, chromite ores have been processed using a number of various pyrometallurgical methods such as the submerged arc furnace (SAF) [7, 8]. Chromite ore is added along with a carbon-containing reducing agent and a flux, typically silica and then smelted in the SAF.
The reduction mechanism of chromite in the presence of a silica flux …
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. …
Smelting of High-Carbon Ferrochrome from Prereduced Chromite …
Experimental smelting of three batches of prereduced chromite raw materials with different degrees of metallization of chromium was conducted in the 0.2 MVA ore-smelting furnace of the Chemical ...
Reduction of carbon-chromite composite pellets with silica flux
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 …
A kinetic study on chromite ore smelting reduction
Experiments on the smelting reduction of chromite ore in a 1-kg middle frequency induction furnace showed that the reduction is controlled by the mass transfer of chromium oxide dissolved in the slag. The dissolution of chromite particles into the liquid slag has little effect on the reduction rate. A decrease in the initial slag basicity (CaO/SiO 2 ) from 1.5 …
The reduction mechanism of chromite in the presence …
Chromite in the Presence of a Silica Flux P. WEBER and R.H. ERIC The reduction behavior of a natural chromite from the Bushveld Complex of South Africa was ... At present, high-carbon ferro- chromium is produced in submerged-arc furnaces. Disadvantages of this process are the limited use of chrome ore fines and friable chrome …
The Technology Study of Silicon Reduction of Chromite Powder …
Table 1 shows the content of Cr 2 O 3 is 40.82%, the content of FeO is 14.10%, the ratio of chrome and iron (Cr 2 O 3 /FeO) is 1.69. Iron chromium (Cr 2 O 3 /FeO) refers to the Cr 2 O 3 and FeO in chromite (the actual content of FeO and TFe are converted to the sum of FeO content), the same grade is an important index for …
Kinetic Studies on the Reduction of Iron Oxides in Low-Grade Chromite …
In a novel method of beneficiation of low-grade chromite ore, nuggets, 25 mm in diameter and 10 mm long, made of chromite ore and coke fines, are subjected to partial reduction. A significant degree of reduction of iron oxide is observed at temperatures of 1373–1523 K up to a reduction time of 240 min, and subsequent magnetic separation …
Carbothermic Reduction of Chromite Ore Under Different …
The reduction of chromite ore with carbon has been studied extensively in many laboratories. Inert gases have been used in these investigations to control the experimental conditions. ... 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 …
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