We have been experimented the dephosphorization on three charges. With the first charge, on the load (approximately 3 tones), the following additions have been made: ˜ 40 kg CaF2, ˜ 60 kg iron ore (pellet), ˜ 80 kg lime. After melting, the composition of the metallic bath is presented in Table 3.
Chemical dephosphorization methods for iron ore were reviewed and tested on the ore samples from the Pilbara region. Leaching without thermal treatment was found to be quite ineffective. When phosphorus is disseminated in iron structure, possibly forming cryptocrystalline phosphates
In the primary route of steel making iron ore is used as raw material. In the first stage iron ore is melted in a blast furnace to produce hot metal, and in second stage this hot metal is moved to a steel making shop to produce steel in a basic oxygen furnace. In the secondary route of steel making steel is produced using sponge iron, scrap etc.
proven Nigerian iron ore deposit with phosphorus content in the range of 1.4-2.0%. In this study, dephosphorization of Agbaja iron ore using three acids and in different combinations were investigated. The design of experiment for the valuation of interactive factorial effects on …
ABSTRACT: The purpose of this research effort is to determine the optimal factors for dephosphorization of a Nigerian Agbaja iron ore. The process The process parameters used in the study of optimization of dephosphorization includes pH, particle size, dwell time.
A hydrometallurgical process for the dephosphorization of iron ore. HydrometaUurgy, 21: 277-292. A process is proposed for the dephosphorization of iron ore. The process consists of an inte- grated treatment for the removal of the phosphorus from the ore by leaching and further process- …
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Optimization of Process Parameters for the Dephosphorization of iron ore using Nitric Acid *T.O. Chime, *Department of Chemical Engineering, Enugu State University of Science and Technology
Central Composite Design In Optimization Of The Factors Of Dephosphorization Of Agbaja Iron Ore . By . Abstract. ABSTRACT: The purpose of this research effort is to determine the optimal factors for dephosphorization of a Nigerian Agbaja iron ore. The process parameters used in the study of optimization of dephosphorization includes pH ...
2.4. Dephosphorization Treatment by Pre-reduction, Mechanical Crushing and Screening Methods The dephosphorization treatment of high phosphorus iron ore …
Optimization of Process Parameters for the Dephosphorization of iron ore using Nitric Acid - written by T. O. Chime, O. D. Onukwuli, I. O. Ani published on 2016/10/06 download full …
Many researchers [13-15] have tried to remove phosphorous from different source of phosphorous by various method. The sources may be Iron ore, Slag, Sludge and different phosphorus containing alloys etc. Reduction method, Leaching, Flotation method, vacuum refining and Microwave radiation methods are some of the processes which are in use widely.
Alkali-leaching and acid-leaching were proposed for the dephosphorization of Changde iron ore, which contains an average of 1.12% for phosphorus content. Sodium hydroxide, sulfuriced, hydrochloric and nitric acids were used for the preparation of leach solutions.
Factors Affecting Dephosphorization of Agbaja Ir on Ore (Kogi State), Nigeria process, physical separation and chemical leachi ng (Kobal1990).As is well known, smelting process is
Abstract. Abstract. A new method to process the oolitic high phosphorus iron ore for phosphorus removal has been proposed in this research. It is an integration of direct reduction and melting separation with carbon-containing pellets prepared using biomass char. Experiments of direct reduction were preceded using a tubular furnace and three parameters were investigated and they were reduction ...
INTERNATIONAL JOURNAL OF MULTIDISCIPLINARY SCIENCES AND ENGINEERING, VOL. 5, NO. 7, JULY 2014 [ISSN: 2045-7057] www.ijmse.org 13 Optimization of Process Conditions for the Dephosphorization of Iron Ore Using Sulphuric Acid
Journal of Iron and Steel Research, International, v. 18, p. 01-04, 2011. [ Links ] XU, C. et al. Mechanism of phosphorus removal in beneficiation of high phosphorous oolitic hematite by direct reduction roasting with dephosphorization agent. Trans. Nonferrous Met. Soc China, v. 22, p. 2806−2812, 2012.
Mar 31, 2015· With the current tendency for development of a low-cost and eco-friendly process, dephosphorization of high-phosphorus iron ore through microbial process with three different sources of Aspergillus niger strains was studied in this study.
Jan 10, 2014· Read "Investigation of dephosphorization of brown iron ore concentrates by sintering and magnetic beneficiation, International Journal of Mineral Processing" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Unfortunately, this large reserve cannot be utilized for the production of pig iron due to its high sulphur and phosphorus contents. In addition, the ore cannot be beneficiated easily like Itakpe and Oshokoshoko iron ores because of its texture. This work studied the beneficiation, dephosphorization and desulphurization of Agbaja iron ore.
Flexibility in raw materials, the lower natural gas prices, and the increased use of nonconventional Electric Arc Furnace (EAF) steelmaking using up to Direct Reduced Iron (DRI) have prompted a renewed interest in better control of phosphorus. Iron ore and DRI have higher phosphorus and silica compared to scrap.
The dephosphorization treatment of the pre-reduced iron ore by mechanical crushing and screening methods was evaluated as a function of the initial reduction condition, screen size, and the mechanical property of the reduced iron ore phase.
Jan 05, 2012· Jorge Madias, in Treatise on Process Metallurgy: Industrial Processes, 2014. 126.96.36.199 Refining in EAF. For most steelmaking operations, refining in the EAF is limited to dephosphorization, decarburization, and temperature adjustment.Phosphorus in the charge could be at higher than usual levels for DRI, HBI, pig iron, and hot metal, depending on the iron ore source.
Dephosphorization tests were carried out using a commercially operating converter of Nagoya Works equipped with bottom blow-ing facilities for powder injection.23, 24) Burnt lime, iron ore, and flu-orspar were added to approximately 110 t of molten pig iron, and the amount of top blown oxygen was changed. Either lime stone or
Hydrometallurgy based dephosphorization of iron ore as observed from experiment and model prediction [3-5] has shown that phosphorus removal during leaching using oxalic acid solution, is highly dependent on the final pH of the leaching solution (which varies time …
In this work, we propose, the addition of energy in the iron ore particles using microwave energy due to its efficiency in heat generation. Therefore, in this study, we evaluated the acid leaching process in the iron ore particles targeting of reducing the phosphorus and aluminum contents and was also evaluated the removal of iron in the particles.
Dephosphorization process of high phosphorus oolitic iron ore by acid leaching and leaching kinetics were investigated in the paper. The high phosphorus ore samples (51%T.Fe, 0.52%P) used in this work were analysed by SEM-EDS and XRD, which showed their oolitic structure and mineral phases.
Comparative assessment of phosphorus removal from Nigeria’s agbaja iron ore using potassium chlorate and sodium hydroxide. American Journal of Research Communication, 2013, 1(8): 43-52} www.usa-journals.com, ISSN: 2325-4076. INTRODUCTION . The need for a drastic reduction in the concentrations of phosphorus present in iron ore as a way of
Aug 15, 2016· The initial comprehensive studies on dephosphorization were conducted during the 1940s. These studies observed that FeO and CaO are necessary slag constituents for the dephosphorization of steel. These studies also showed that the dephosphorization reaction is exothermic and that the slag capacity for dephosphorization decreases with temperature.
The latest development of the mineral dressing process for phosphorus separation from high phosphorus iron ore and the reaction mechanism of steelmaking dephosphorization are introduced.Each stage of low phosphorus steel production,such as the pretreatment of hot metal,converter steelmaking,secondary refining,especially the flux series for the dephosphorization in the secondary refining and ...