FACTORS AFFECTING THE REDUCIBILITY OF SINTERED CHROMITE,
FACTORS AFFECTING THE REDUCIBILITY OF SINTERED CHROMITE PELLETS AND CHROMITE LUMPY ORE T. Lintumaa, H. Krogerus and P. Jokinen1 Outokumpu Technology, Research Center, Pori, Outokumpu Research Oy Kuparitie 10, P.O. Box 60, 28330 Pori, Finland 1Outokumpu Technology Oy , Riihitontuntie 7, P.O. Box 862, 02201 Espoo, Finland(PDF) Reduction of chromite pellet with CO,Reduction of lumpy ore took place slower than reduction of a pellet. In all samples, chr omite reduction proceeded longer in the outer part of the sampleFACTORS AFFECTING THE REDUCIBILITY OF SINTERED CHROMITE,,The energy consumption and recovery of chromium are important economic factors in ferrochrome production. Outokumpu has a lot of experience of the reduction behavior of the sintered pellets in industrial-scale furnaces and also on the grounds of numerous laboratory and pilot-scale investigations. Sintered pellets have shown a superiority over lumpy ore andInvestigations on the carbothermic reduction of chromite,,Experimental studies were carried out on the reducibility of two different chromite ores using different reducing carbonaceous reducing agents in the temperature range 1173 to 1573 K. “Friable lumpy” ores and “hard lumpy” ores were used in the experiments. Petroleum coke, devolatilized coke, (DVC) and graphite were used as reducing agents.Dissolution and reduction of chromite ore in ferrochromium,,chromite ore was fed into the molten slag, and was followed by reduction of iron and chromium oxides., The purpose of the present study was to investigate the reducibility potential of the chromite particles entrapped in the ferrochromium slags. The influence of each slag(PDF) Effects of oxidation on the microstructure and,,of chromite occurs by the following sequence of reactions; a) “Initially, Fe 3+ and Fe2+ at the surface of the chromite particle are reduced to the metallic state. This
EFFECTS OF OXIDATION ON THE MICROSTRUCTURE AND
Chromite ores used in the production of ferrochromium are charged as lump or pelletised fines submerged arc furnace. The reducibility of the ores in CO gas atmospheres is an importantA novel reductive alkali roasting of chromite ores for,,05-02-2021· The reduction of chromite ores with alkali eliminates the risk of carcinogenic Cr 6+ - ion production during the extraction of chroimum oxide and Fe-Cr-alloy. The alumina is also extracted as a by-product of the process. • The CO generated in the process is partly utilized for energy generation by combustion via CO+0.5O 2 = CO 2 reaction.Production of Ferro-Chrome – IspatGuru,10-07-2018· Chromite ore is reduced by coal and coke to form the Fe-Cr alloy. The heat for this reaction can come from several forms, but typically from the electric arc formed between the tips of the electrodes in the bottom of the furnace and the furnace hearth. This arc creates temperatures of about 2,800 deg C.TheMelting Behaviour ofChromite Ores and the Formation,,It is evident that the reduction of the chromite ore takes place mainly in the softening zone, and not in the slag layer. By the time the mixture of initial slag and charge material moves downwards to the slag layer, the chromjum reduction is nearly complete. There is a small difference in slag composition with time.reducibility of chromite - cementgrindingprocess,Factors Affecting the Reducibility of Sintered Chromite Pellets and Chromite Lumpy Ore 77 carbon addition on the porosity was 2 3 points 4 An addition of wood dust or dolomite increased the sof tening point of the sintered pellet When simultaneously . PDF INFLUENCE OF TEMPERATURE AND PARTICLE SIZE ON(PDF) The Reduction Process and Reducibility of Chromite,The Reduction Process and Reducibility of Chromite With Carbon Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan - Japan doi 10.2355/tetsutohagane1955.60.9_1289
(PDF) Reduction of chromite pellet with CO
In general, the present experimental evidence suggests that the reduction of chromite with carbon monoxide. is possible, but the presence of solid carbon isReducibility Of Chromite - reise-nach-australien.de,Reducibility Of Chromite Factors affecting the reducibility of sintered. Factors affecting the reducibility of sintered chromite pellets and chromite lumpy ore by t lintumaa h krogerus and p jokinen abstract the energy consumption and recovery of chromium are important economic factors in ferrochrome produc-tion.(PDF) Effects of oxidation on the microstructure and,,They found that pre-heating the pelletised ore at temperatures between 1000 and 1200°C in air increased the reducibility of the chromite in the smelting furnace.,Carbothermic Reduction of Chromite Ore Under Different,,15-09-2009· Experiments were carried out to explore the influence of the flow rate of inert gas on the reducibility of chromite ore. Reduction of Chromite Ores The solid-state reduction of chromite ores under different conditions has been studied by several investigators.[ 1 – 24 ] The chromite ores have a spinel structure that can be represented by the general formula (Fe, XCatalytic reduction of carbon-chromite composite pellets,,25-05-1997· Effect of temperature (9.54% CaO). reducibility of chromite. This is in agreement with that comparable with that obtained in a previous study obtained by Fernandes et al. [8]. (118 kJ/mol) [9]. The difference may be explained by the effect of heat treatment, which alters the micro- structures of chromite grains [8].Production of Ferro-Chrome – IspatGuru,10-07-2018· Reducibility of chromite ore is important for process efficiency. It is determined by its mineralogy (MgO/Al2O3 ratio), the MgO structural form in the chromite ore, chromite grain size, the extent of grains distribution in ore and the ore melting temperature.
クロマイトの炭素還元過程および被還元性について*
3) Of the constituents of chromite, iron oxide had the strongest influence on its reducibility. At tem peratures below about 1200†Ž, the porosity of chromite particles was also of great interest, and porous chromite was reduced more easily than compact chromite.Fusion of Chromite Ore Using Sodium Phosphate Salt as Flux,,05-04-2021· However, increasing the amount of Fe 3+ ions compared to Al 3+ ions in the trivalent sites will increase the reducibility of the chromite spinel.4 The pressing technique and fusion method are common techniques used in sample preparation of chromite mineral ore.5 Fusion techniques have many attributes, which include complete sample conversion and allow(PDF) The Reduction Process and Reducibility of Chromite,The Reduction Process and Reducibility of Chromite With Carbon Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan - Japan doi 10.2355/tetsutohagane1955.60.9_1289The reducibilty of chromite ore and reactivity of,,11-02-2013· The purpose of this dissertation is to study the reducibility of chromite ore and reactivity of carbonaceous reductants. The effect of temperature, particle size, composition, reducing agent and reducing atmosphere on the kinetics of the reduction of given chromite (obtained from Xstrata) was studied.using tga,and to test reactivity of the reductant, presentReducibility Of Chromite - reise-nach-australien.de,Reducibility Of Chromite Factors affecting the reducibility of sintered. Factors affecting the reducibility of sintered chromite pellets and chromite lumpy ore by t lintumaa h krogerus and p jokinen abstract the energy consumption and recovery of chromium are important economic factors in ferrochrome produc-tion.Investigations on the carbothermic reduction of chromite,,Experimental studies were carried out on the reducibility of two different chromite ores using different reducing carbonaceous reducing agents in the temperature range 1173 to
クロマイトの炭素還元過程および被還元性について*
3) Of the constituents of chromite, iron oxide had the strongest influence on its reducibility. At tem peratures below about 1200†Ž, the porosity of chromite particles was also of great interest, and porous chromite was reduced more easily than compact chromite.Catalytic reduction of carbon-chromite composite pellets,,25-05-1997· Effect of temperature (9.54% CaO). reducibility of chromite. This is in agreement with that comparable with that obtained in a previous study obtained by Fernandes et al. [8]. (118 kJ/mol) [9]. The difference may be explained by the effect of heat treatment, which alters the micro- structures of chromite grains [8].(PDF) INFLUENCE OF TEMPERATURE AND PARTICLE SIZE ON,,An optimum particle size of the chromite ore and that of coke must be chosen,, Figures 1 and 2 describe the effect of the size of the or e on its reducibility.Utilisation of pre-oxidised ore in the pelletised chromite,,01-06-2016· They found that pre-heating the pelletised ore at temperatures between 1000 and 1200 °C in air increased the reducibility of the chromite in the smelting furnace. They attributed this increased reducibility to the increase in the effective surface area created due to the shear mechanism generating smaller particles, i.e. the,Fusion of Chromite Ore Using Sodium Phosphate Salt as Flux,,05-04-2021· However, increasing the amount of Fe 3+ ions compared to Al 3+ ions in the trivalent sites will increase the reducibility of the chromite spinel.4 The pressing technique and fusion method are common techniques used in sample preparation of chromite mineral ore.5 Fusion techniques have many attributes, which include complete sample conversion and allowReduction of Iron Oxides with Hydrogen—A Review,,Oxidized magnetite shows nearly the same reducibility as natural hematite. Edström 41 investigated the reducibility of different iron oxides with hydrogen and carbon monoxide at 1000 °C, as shown in Figure 7. The reduction of hematite occurs faster in both cases, with hydrogen and carbon monoxide.
