Menu
the two main directions for phosphorus removal from iron ores used in steelmaking could be summarized as: 1) addition of alkali or alkaline earth compounds before direct reduction of iron (dri), besides volatilization the process includes magnetic separation; and 2) thermal process at lower temperatures using additives followed by physical .
Get price
The FeO-CaO-SiO2-P2O5(-MgO-MnO) system is the typical dephosphorization slag. The morphology of solidified dephosphorization slag has been discussed in a number of previous studies. According to the report of Futatsuka et al., 16) dephosphorization slag after solidification generally consists of (1) iron free
Get price
The effect of CaCO 3, Na 2 CO 3, and CaF 2 on the reduction roasting and magnetic separation of high-phosphorus iron ore containing phosphorus in the form of Fe 3 PO 7 and apatite was investigated. The results revealed that Na 2 CO 3 had the most significant effect on iron recovery and dephosphorization, followed by CaCO3, the effect of CaF2 was negligible.
Get price
iron below the admissible level. Some researches [1-5] have evaluated ways of achieving successful dephosphorization of iron oxide ore and also predicting removed phosphorus concentrations using empirical models. A model was derived for predictive analysis of the concentration of phosphorus removed during leaching of iron oxide ore in
Get price
Mixed bacteria can significantly increase the rate of dephosphorization from iron ore in low concentration pulp. It goes against mixed bacteria reproduction when pulp concentration increased, makes dephosphorization decreased. ... Financed by the National Centre for Research and Development under grant No. SP/I/1/77065/10 by the strategic ...
Get price
Abstract - An attempt has been made in this study to optimize the process variables for the dephosphorization of iron ore using nitric acid. Standard central composite design with 23 full factorial was used to develop the model. The model was optimized using Matlab.
Get price
researches have been done for dephosphorization of these wastes by diversity of methods [1-4]. The aim of this study is ... solution [13-16], in this study High-phosphorous Iron ore mineral waste of Choghart Irone mine (central part of Iran) ... E. Thermodynamic studies . Thermodynamic experiments were carried out by placing 2
Get price
The ore dressing process of oolitic high phosphorus hematite includes the following steps: roasting crushed oolitic high phosphorus hematite in 80-99 wt% with coal powder as reductant in 1-20 wt% inside a shaft furnace or rotary kiln at 700-1050 deg.c for 0.5-2.5 hr and sealed cooling to room temperature; crushing the roasted hematite, grinding and weak magnetic separation; regulating pH value ...
Get price
This Special Issue, "Ironmaking and Steelmaking", released by the journal Metals, published 33 high quality articles from the international iron and steel community, covering the state-of-the-art of the ironmaking and steelmaking processes. This includes fundamental understanding, experimental investigation, pilot plant trials, industrial ...
Get price
The values of ΔG° for CePO4 indicate decomposition commences between 1500 and 1600 °C, wherein either P 2O 5or P 4O 6 is formed. In comparison, the decomposition temperatures were found to be significantly higher (up to 2300 °C) for pathways producing PO(g), PO 2(g), and P(g) as products.
Get price
In this study, a combination of alkali roasting and hydrothermal treatment is used as a method of gangue (Si, Al, and P) removal from iron ores as a means to upgrade low-grade iron ore (limonite) into a high-grade iron ore with low gangue content, low porosity, and high Fe and Fe2O3 content to enhance the sustainable development of iron and steel industries. The effects of the combined ...
Get price
The U.S. Department of Energy's Office of Scientific and Technical Information
Get price
the dephosphorization furnace performs high-speed dephosphorization operation on all the hot metal that goes through this shop. This dephosphorization operation is BF synchronized with the tap-to-tap time of the decarburiza-tion furnace, to which the hot metal is then sent. The effi-cient high-speed dephosphorization achieved by these
Get price
and validated through the (3) by means of grinding fineness tests to determine the suitability of the ore grinding fineness of-.074mm63.68%; (4) by examining iron, calcium elements in the ore in the distribution of various size, we know fe203 and cao mainly in-0.030mm fine-grained level, the de-mud removal-0.030mm grain minerals, can .
Get price
bauxite has bad effects on the hot metal dephosphorization and slag basicity, which may increase the steelmaking cost. Hiromi S et al [8] studies the effects and mechanism of the calcium ferrite melting lime, Takashi S et al [9] studies the hot metal dephosphorization effect by slag formation of the calcium ferrite producing the high carbon steel.
Get price
In integrated steel plants, the removal of phosphorous normally takes place during the primary basic oxygen furnace (BOF) steelmaking process. Phosphorous is usually introduced to the integrated steelmaking process through blast furnace additions, such as iron ore, coke, sinter, and fluxes. Among the others parameters such as optimizing the charging system, oxygen supply system, oxygen lance ...
Get price
Dephosphorization pretreatment or decarburization and heating are completed in one converter. 1. The metal-slag is completely separated after the dephosphorization pretreatment, which is helpful for producing ultralow [P] steel. 2. The high temperature decarburization slags can be directly used in dephosphorization. 3.
Get price
cao-bao（55%）-caf 2 -cr 2 o 3 /fe 2 o 3 fluxes was used in dephosphorization of hot metal containing chromium w [p]decreased by 50.77～78.13%with 100kg/t fluxes injected by air into hot metal melt.a method was invented by author to treat waste slag containing bao,which could dissolve in water and harmful to human health.the waste slag treated with .
Get price
The oxygen for desiliconisation and dephosphorisation was supplied by either top charging of iron ore or injection of dehydrated air with an equivalent oxygen amount. The changes in the C, Si and P contents of the hot metal under the different conditions are presented in Figure 6.
Get price
Abstract: In the paper, the experimental research on dephosphorization and iron yield for high-phosphorus oolitic hematite by coal-based carbothermal reduction was carried out. It indicated that microwave can speed up the rate of carbothermal reduction of iron ore and strengthen the effects of dephosphorization and increasing iron content.
Get price
iron ore quality, composition of coke etc. Moreover, there exists strong dependence of these models with the original experimental data. Identifying the factors which can lead to a higher degree of dephosphorization, building new infrastructures, and updating the existing amenities based on these
Get price
Some types of iron ore that contain V and Nb can be used as sources of these elements. This study clarified the possibility of extracting V and Nb by means of a conventional hot metal dephosphorization process without using CaF2 as a flux. ... and the results were compared with experimental ones. The results are summarized as follows: (1) The ...
Get price
American Journal of Research Communication Ameh, et al., 2013: Vol 1(8 ... experimental results were 3.0 x 10-3, 2.975 x 10 -and 2.475 x10-3 % g1 respectively. Deviational analysis ... In countries having high phosphorus-iron ore, the highlighted dephosphorization process is capable
Get price
direct reduction iron was prepared by adding dephosphorization agents during a direct reduction roasting-magnetic separation process,and the effects of reductants on the direct reduction process of high-phosphorus oolitic hematite were studied.experimental results and sem analysis show that the aggregation and growth of iron crystals,the increase .
Get price
model derived using experimental results generated previously [5 that at a ] indicated ... corresponding experimental values) was less than 29%. Past research [6] has shown the possibility of dephosphorizing iron ore by breaking the ... countries having high phosphorus-iron ore, the highlighted dephosphorization process is capable of providinga ...
Get price
Some researchers have studied the e ect of C2S in the dephosphorization slag system on dephosphorization e ciency. Suito et al. [17] found that according to the experimental study, the dephosphorization rate would be greatly improved when the slag system contains more solid lime particles and dicalcium silicate particles.
Get price
15.10 - 15.30 RESEARCH AND INNOVATIONS: SMART INITIATIVES IN TRANSFORMATION OF ... 11.00 - 11.15 TESTING OF BLACK PELLETS IN IRON ORE SINTERING CONDITIONS . Iron and Steelmaking 2019 . ... ORDER TO INCREASE THEIR DEPHOSPHORIZATION AND DESULPHURIZATION CAPACITY . Marta Ślęzak, Mirosław Karbowniczek, Michał Moskal, Piotr Migas, Wojciech ...
Get price
Jun 18, 2021The iron recovery is slightly lower, but still above 98%. However, the corresponding phosphorus content in the iron ore concentrate reaches a minimum value of 0.20% at 500 r/min and a minimum value of 0.5% at 500 r/min. The phosphorus removal rate decreases when the velocity exceeds 500 r/min. Line 1: Grade of iron ore concentrate Line 2: Iron ...
Get price
According to the option pricing principle of B-S model and assuming that the value of iron ore assets in iron ore investment projects of steel enterprises obeys
Get price
In this work, the structure of high phosphorus iron ore was analyzed first. Different acids leaching processes were researched in detail and the effect of experiment factors on dephosphorization process was investigated with further study about leaching kinetics. Besides, analysis of iron loss was also involved. 2. Experimental 2.1. Iron Ore ...
Get priceThe dephosphorization of a reduced iron sample containing 1.79% P, 0.19% C, 2.15% SiO 2, 1.21% Al 2 O 3, and 10.32% FeO was tested using a SP-25 induction furnace (Shenyang Kejing Auto-instrument Co., Ltd., Shenyang, China) at 1873 K. An argon gas flow was used to purge the furnace.
Get price
The dephosphorization mechanism of blast furnace dust and coal slime were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM)-energy dispersive X-ray spectroscopy (EDS). A DRI with 91.88 wt. % iron grade, 88.38% iron recovery and 0.072 wt. % P can be obtained with 30 wt. % blast furnace dust as reductant.
Get price
Steelmakers are therefore exploring the possibilities for refining high phosphorus iron ore and aim at developing solutions that ensure controlling the final phosphorus contents within the target range under those new circumstances. A detailed study of the thermodynamics of dephosphorization reaction at conditions relevant for the BOF process ...
Get price
： The possibility of reuse of iron ore tailings as sand for construction was investigated through the analysis of chemical composition,mineral composition,particle size distribution and other performances of iron ore tailings.Iron ore tailings were utilized to replace part of the natural river sand to prepare thermal insulation glazed hollow bead concrete.The influences of substitution ...
Get price
2 Chongqing Iron and Steel Research Institute Co. LTD, Chongqing 400084, China; ... Abstract: In this paper, the CaO-SiO2-FetO-P2O5 dephosphorization slag system during the premier ... The research results show that when the FeO content in the liquid slag increases from 32.21% to 50.31%, the distribution ratio of ...
Get price
future success of iron ore, iron and steel making industry. Effective dephosphorisation of Western Australian iron has been demonstrated [1]. In this research work, sulphuric acid was chosen as the leachant on the basis of its availability and low cost. The iron ore sample used in this study typically contained 0.126% phosphorus. After
Get price
The best fineness for separation is -0.045mm 85%. The concentrate contains Fe 67.86% under 0.2T field intensity. Processing the tailings twice under 0.5T field intensity, the concentrate contains Fe 55.06%.The total recovery is 53.72%. The study on low-grade iron ore tailings to recover iron achieves good results in improving resource utilization.
Get price
Dephosphorization experiments were carried out in cotton-stoppered 250-ml Erlenmeyer flasks with 150-ml modified NBRIP liquid medium containing 3.0-g ore sample. Spore suspensions of the strains were counted by a hemocytometer to adjust the count to approximately 1.0 × 10 7 spores per milliliter.
Get price
The dephosphorization mechanism of blast furnace dust and coal slime were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM)-energy dispersive X-ray spectroscopy (EDS). A DRI with 91.88 wt. % iron grade, 88.38% iron recovery and 0.072 wt. % P can be obtained with 30 wt. % blast furnace dust as reductant.
Get price
from the test results, dephosphorization is more appropriate for the temperature range 1500-1550°c, the temperature can meet the mobility of iron slag, but also to meet the needs of dephosphorization, with the increase of basicity, lower phosphorus content of hot metal, when the alkalinity of 2.5, the iron content of 0.11% phosphorus, hot metal .
Get priceCopyright ©2000- CCM MINERALS CO.,LTD.
