Thermochemical analysis for the reduction behavior of FeO in EAF slag via Aluminothermic Smelting Reduction (ASR) process: Part II. Effect of aluminum dross and lime fluxing on Fe and Mn recovery

Calphad ◽  
2017 ◽  
Vol 58 ◽  
pp. 229-238 ◽  
Author(s):  
Jung Ho Heo ◽  
Joo Hyun Park
Keyword(s):  
Smelting Reduction ◽  
Reduction Behavior ◽  
Aluminum Dross ◽  
Fe And Mn ◽  
Eaf Slag ◽  
Mn Recovery

Influence of Reduction Temperatures on Reduction of FeO-Containing Slag by Agricultural Waste

2017 ◽  
Vol 888 ◽  
pp. 441-446
Author(s):  
Anis Nadhirah Ismail ◽  
Nur Farhana Diyana Mohd Yunos ◽  
Shamsul Baharin Jamaludin ◽  
Muhammad Asri Idris ◽  
Mohd Hakim Ibrahim ◽  
...  
Keyword(s):  
Metallic Iron ◽  
Gas Flow ◽  
Agricultural Waste ◽  
Chemical Activation ◽  
Carbon Sources ◽  
Reduction Process ◽  
Reducing Agent ◽  
Reduction Behavior ◽  
Improve Energy Efficiency ◽  
Eaf Slag

Generally, the conventional carbon sources such coke/coal are used in EAF steelmaking attributed the highest growth rate in energy consumption. A substitute routes striving to improve energy efficiency by providing auxiliary sources is essential. The unique features such high carbon content, surface area, porosity and low sulphur was available in agricultural waste clearly have the potential to be used as reducing agent in steelmaking process. The present study investigated the reduction behavior of EAF slag and production of metallic iron by reduction process. The carbon materials, coke and palm char (pyrolyzed via chemical activation) were used as reducing agent composite with EAF slag respectively. The reduction reaction was conducted in horizontal tube furnace at different reduction temperatures (1250°C, 1350°C, 1450°C and 1550°C) under argon gas (flow rate 0.01L/min) within 20 minutes. The reduced sample was examined by X-ray Diffraction (XRD) and Scanning Electron Microscope (SEM) to understand the reduction behavior of both composite samples. Palm char showed more efficient due to improvement in degree of FeO reduction which was 57.72% compared to coke, 26.72%. The phase movement from iron oxide to iron was influenced by the reduction temperatures. XRD pattern revealed that the metallic iron was initiating appeared at temperature 1250°C and completely reduced at temperature of 1550°C . Predominant peak of metallic iron and the other oxides was clarified by EDS spectra. This study found that palm char has viability to be used as carbon sources in steelmaking applications.

scholarly journals Smelting Reduction Behavior of Prereduced Chromite Ore

1993 ◽  
Vol 79 (6) ◽  
pp. 652-658
Author(s):  
Hiroshi G. KATAYAMA ◽  
Katsuyuki MIYAUCHI ◽  
Naoki DEKURA ◽  
Tadashi MOMONO ◽  
Shinji HIRAI
Keyword(s):  
Smelting Reduction ◽  
Reduction Behavior ◽  
Chromite Ore

scholarly journals Reduction of Haematite Using Hydrogen Thermal Plasma

2019 ◽  
Author(s):  
Masab Naseri Seftejani ◽  
Johannes Schenk ◽  
Michael Andreas Zarl
Keyword(s):  
Thermal Plasma ◽  
Hydrogen Plasma ◽  
Reduction Rate ◽  
Reduction Process ◽  
Pilot Scale ◽  
Phosphorus Concentration ◽  
Smelting Reduction ◽  
Reduction Behavior ◽  
Degree Of Reduction ◽  
Hydrogen Utilization

The development of hydrogen plasma smelting reduction as a CO2 emission-free steel-making process is a promising approach. This study presents a concept of the reduction of hematite using hydrogen thermal plasma. A laboratory scale and pilot scale hydrogen plasma smelting reduction (HPSR) process are introduced. To assess the reduction behavior of hematite, a series of experiments has been conducted and the main parameters of the reduction behavior, namely the degree of hydrogen utilization, degree of reduction and the reduction rate are discussed. The thermodynamic aspect of the hematite reduction is considered and the pertinent calculations have been carried out using FactSageTM 7.2. The degree of hydrogen utilization and the degree of reduction were calculated using the off-gas chemical composition. The contribution of carbon, introduced from the graphite electrode, ignition pin and steel crucible, to the reduction reactions was studied. The degree of reduction of hematite, regarding H2O, CO and CO2 as the gaseous reduction products, is determined. It is shown that the degree of hydrogen utilization and the reduction rate were high at the beginning of the experiments, then decreased during the reduction process owing to the diminishing of iron oxide. Conducting experiments with the high basicity of slag B2=2 led to a decrease of the phosphorus concentration in the produced iron.

A Study on the Reduction Behavior of Molten EAF Slag

2014 ◽  
Vol 52 (10) ◽  
pp. 791-798 ◽  
Author(s):  
Byung Don You ◽  
Ju Hun Kim ◽  
Seong Woong Joo ◽  
Dong Jun Kim ◽  
Soo Young Kim ◽  
...  
Keyword(s):  
Reduction Behavior ◽  
Eaf Slag

Valence state analysis of elements by EPMA and its application

1990 ◽  
Vol 48 (2) ◽  
pp. 230-231
Author(s):  
Chen Liqing ◽  
Liu Zuqin ◽  
Zhang Wei
Keyword(s):  
Valence State ◽  
Line Intensities ◽  
Valence States ◽  
Valence Electrons ◽  
Fe And Mn ◽  
Intensity Ratios ◽  
State Analysis

Valence state analyses of Fe and Mn in oxides by EPMA have been reported in literature. In this paper, the effects of valence state on intensity ratios ILα/IKα and ILα/ILβ of Cu, Ni, Co, Fe, Mn, Cr and their oxides, and on intensity ratios ILβ2/ILα1 and ILγ1/ILα1 of Mo, Nb, Zr and their oxides were studied. It was observed that intensity ratios change with valence states in accordance with some regularities, and these effects could be utilized for analyzing the valence states of catalysts.Valence state analysis of elements by EPMA is based on the fact that changes in the states of valence electrons in the outer shells of an atom cause corresponding changes in line intensities. The M electrons of Cu, Ni, Co, Fe, Mn, Cr and the N electrons of Mo, Nb, Zr are valence electrons. Line Kα1,2 and six lines of L are produced from the transitions of K-L2,3 and L-M or L-N respectively.

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