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  • 1.
    Ali, Heba
    et al.
    Cent Met Res & Dev Inst CMRDI, Pyrometallurg Proc Ores Dept, Cairo, Egypt; Cent Met Res & Dev Inst CMRDI, Pyrometallurg Proc Ores Dept, PO Box 87, 1, El-felezat St El-Tebbin, Cairo, Helwan, Egypt.
    Elsadek, Mohamed
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi. Cent Met Res & Dev Inst CMRDI, Pyrometallurg Proc Ores Dept, Cairo, Egypt.
    Ahmed, Hesham
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi. Pyrometallurgical Processing of Ores Department, Central Metallurgical Research and Development Institute (CMRDI), Cairo, Egypt.
    Investigation of transformations of low-grade manganese ore during the roasting process2023Inngår i: Mineral Processing and Extractive Metallurgy: Transactions of the Institute of Mining and Metallurgy, ISSN 2572-6641, E-ISSN 2572-665X, Vol. 132, nr 1, s. 62-72Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The transformations of low-grade manganese ore were investigated during roasting in the air at different temperatures up to 1200 degrees C. The transformations were followed up by XRD and TGA-DTA. Moreover, the morphology and magnetic properties were determined by SEM and VSM. It was observed that MnO2 transformed to the lower oxide Mn5O8 at 500 degrees C and then to bixbyite (Mn2O3) at 600 degrees C. Finally, the bixbyite decomposed to hausmannite (Mn3O4) at 800 degrees C. Increasing the roasting temperature to 900 degrees C induced a reaction between hematite and hausmannite and led to the formation of a small amount of solid solution of the ferrite spinel MnFe2O4. Further increase in temperature to 1000 degrees C led to the formation of a solid solution of braunite (Mn7SiO12) which decomposed to rhodonite (MnSiO3) at 1200 degrees C. The magnetic susceptibility of the original ore gradually increased with the roasting temperature, from 0.119 x 10(-3) at ambient temperature to a maximum value of 80 x 10(-3) at 1200 degrees C.

  • 2.
    Elsadek, Mohamed
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi. Central Metallurgical Research and Development Institute, Helwan, P.O. Box 87, Cairo, Egypt.
    Ahmed, Hesham
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi. Central Metallurgical Research and Development Institute, Helwan, P.O. Box 87, Cairo, Egypt.
    Suup, Malin
    Boliden Mineral AB, SE-936 32, Boliden, Sweden.
    Sand, Anders
    Boliden Mineral AB, SE-936 32, Boliden, Sweden.
    Heikkinen, Eetu
    Process Metallurgy, University of Oulu, PO Box 4300, FI-90014 Oulu, Finland.
    Khoshkhoo, Mohammad
    Boliden Mineral AB, SE-936 32, Boliden, Sweden.
    Sundqvist-Öqvist, Lena
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi.
    Recycling of pyrite and gypsum mining residues through thermochemical conversion into valuable products2023Inngår i: Resources, Conservation and Recycling, ISSN 0921-3449, E-ISSN 1879-0658, Vol. 199, artikkel-id 107219Artikkel i tidsskrift (Fagfellevurdert)
  • 3.
    Elsadek, Mohamed
    et al.
    SWERIM AB, Aronstorpsvagen 1, 974 37, Luleå, Sweden; Central Metallurgical Research and Development Institute (CMRDI), Cairo 12422, Egypt.
    Mousa, Elsayed
    SWERIM AB, Aronstorpsvagen 1, 974 37, Lulea, Sweden; Central Metallurgical Research and Development Institute (CMRDI), Cairo 12422, Egypt.
    Ahmed, Hesham
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi. Central Metallurgical Research and Development Institute (CMRDI), Cairo 12422, Egypt.
    Green approach to ironmaking: Briquetting and hydrogen reduction of mill scale using novel binders2024Inngår i: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 62, s. 732-738Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The most prominent solutions are the establishment of a circular economy by recirculating the iron-rich residues from steelworks and the adoption of hydrogen as a clean reducing agent to mitigate fossil CO2 emission. One such residue is mill scale, which is generated during steelmaking, casting, and rolling processes. However, the fine particles and easy reoxidation of the mill scale make it difficult to be used directly in iron and steel production without proper compaction. This paper aims to demonstrate the feasibility of mill scale briquetting using organic binders to meet the requirements of hydrogen-based direct reduction. The study will investigate the influence of binder type, binder dosage, moisture content, and compaction pressure on the briquetting process and the briquettes quality. Moreover, the reducibility of optimized briquettes will be examined by hydrogen at 900 °C using a thermogravimetric analyzer coupled with a quadrupole mass spectroscopy (TGA-QMS). The optimal combination for achieving the best mechanical strength and reducibility was a briquette produced with 1% Alcotac® CB6, 1% KemPel, and 2.5% moisture content, compressed at a pressure of 125 kN.

    Fulltekst (pdf)
    fulltext
  • 4.
    Manu, Karthik
    et al.
    Department of Material Science and Engineering, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden; SWERIM AB, Aronstorpsvägen 1, 974 37 Luleå, Sweden.
    Mousa, Elsayed
    SWERIM AB, Aronstorpsvägen 1, 974 37 Luleå, Sweden; Central Metallurgical Research and Development Institute (CMRDI), Cairo 12422, Egypt.
    Ahmed, Hesham
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi. Central Metallurgical Research and Development Institute (CMRDI), Cairo 12422, Egypt.
    Elsadek, Mohamed
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi. Central Metallurgical Research and Development Institute (CMRDI), Cairo 12422, Egypt.
    Yang, Weihong
    Department of Material Science and Engineering, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden.
    Maximizing the Recycling of Iron Ore Pellets Fines Using Innovative Organic Binders2023Inngår i: Materials, E-ISSN 1996-1944, Vol. 16, nr 10, artikkel-id 3888Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This research work focuses on the practicality of using organic binders for the briquetting of pellet fines. The developed briquettes were evaluated in terms of mechanical strength and reduction behavior with hydrogen. A hydraulic compression testing machine and thermogravimetric analysis were incorporated into this work to investigate the mechanical strength and reduction behavior of the produced briquettes. Six organic binders, namely Kempel, lignin, starch, lignosulfonate, Alcotac CB6, and Alcotac FE14, in addition to sodium silicate, were tested for the briquetting of pellet fines. The highest mechanical strength was achieved using sodium silicate, Kempel, CB6, and lignosulfonate. The best combination of binder to attain the required mechanical strength even after 100% reduction was found to be a combination of 1.5 wt.% of organic binder (either CB6 or Kempel) with 0.5 wt.% of inorganic binder (sodium silicate). Upscaling using an extruder gave propitious results in the reduction behavior, as the produced briquettes were highly porous and attained pre-requisite mechanical strength.

    Fulltekst (pdf)
    fulltext
  • 5.
    Parathodiel, Harikrishnan
    et al.
    SWERIM AB, Aronstorpsvägen 1, Luleå, 974 37, Sweden; Department of Chemical Engineering, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden.
    Mousa, Elsayed
    SWERIM AB, Aronstorpsvägen 1, Luleå, 974 37, Sweden; Central Metallurgical Research and Development Institute (CMRDI), Cairo, 12422, Egypt.
    Ahmed, Hesham
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi. Central Metallurgical Research and Development Institute (CMRDI), Cairo, 12422, Egypt.
    Elsadek, Mohamed
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi. Central Metallurgical Research and Development Institute (CMRDI), Cairo, 12422, Egypt.
    Forsberg, Kerstin
    Department of Chemical Engineering, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden.
    Andersson, Charlotte
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi.
    Developing Iron Ore Pellets Using Novel Binders for H2-Based Direct Reduction2023Inngår i: Sustainability, E-ISSN 2071-1050, Vol. 15, nr 14, artikkel-id 11415Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The transformation from traditional iron- and steelmaking technologies to green H2-based new technologies will require an improvement in the quality and purity of iron ore burden materials. Iron ore pellets are essential inputs for producing direct reduced iron (DRI), but the conventional binders, used in iron ore pelletizing, introduce gangue oxides to the DRI and consequently increase the slag generation and energy consumption in the steelmaking unit. Partial and/or full replacement of the traditional binders with novel organic binders would significantly contribute to improving the process efficiency, particularly in the next-generation H2-based direct reduction technology. This study illustrates the feasibility of pelletizing magnetite iron ore concentrate using four organic binders: KemPel, Alcotac CS, Alcotac FE16, and CMC, in comparison to bentonite as a reference. The study explores the influence of binder type, binder dosage, and moisture content on the characteristics and properties of the pellets. The efficiency of binders was characterized by the moisture content, drop number test, cold compression strength, and H2 reduction of pellets. For dry pellets, CMS was superior among other binders including bentonite in developing dry strength. After firing, the pellets produced by the partial replacement of bentonite with 0.1 wt.% KemPel demonstrate a performance nearly identical to the reference pellets. While the complete replacement of bentonite with organic binder shows a lower performance of fired pellets compared to the reference, it may still be suitable for use in DR shaft furnaces. The cold-bonded pellets demonstrate a superior reduction rate compared to fired pellets.

    Fulltekst (pdf)
    fulltext
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