Anis Nadhirah Ismail
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Preferred name
Anis Nadhirah Ismail
Official Name
Anis Nadhirah, Ismail
Alternative Name
Ismail, Anis Nadhirah
Ismail, A. N.
Main Affiliation
Scopus Author ID
55993155200
Researcher ID
FCT-7813-2022

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Synthesis of ferrosilicon from coconut char as reductant at different reduction times

2024-03 , Anis Nadhirah Ismail , Nik Natasya Ameera Nik Hukman Sani , Mohd Hakim Ibrahim

In the steelmaking industry, the kind of silica and carbon sources utilized in the ferrosilicon manufacturing process have a big impact on the operation's stability, energy usage, and cost. Biomass resources have gained attention due to their potential to replace existing materials to produce activated carbon as it is the best way to preserve the environment. Thus, this study focused on the synthesis of ferrosilicon from coconut char as a reductant at different reduction times (30, 60, 90 and 120 minutes). The coconut char was prepared by physical activation method via pyrolysis process at 450 ÌŠC within 2 hours under a nitrogen atmosphere. X-ray Diffraction (XRD), X-ray fluorescence (XRF), and Optical Microscope (OM) were used to characterize the activated carbon from coconut shells. CHNS analysis found an increment of about 65% in carbon content after pyrolyzed, which could potentially be used as a reductant in ferrosilicon synthesis. Next, the ferrosilicon synthesis study was conducted in a muffle furnace at a reduction temperature of 1200 ÌŠC with a flow rate of 10 ÌŠC/min for 30, 60, 90, and 120 minutes of reduction times. Phase transformation of reduced samples at different reduction times was analyzed by X-ray Diffraction (XRD). XRD pattern found that at 120 minutes reduction times, the iron silicon peak is observed as the morphology analysis showed a presence of metallic grey particles which represent the existence of iron silicon. The possibility of converting the biomass into an alternate supply that was discovered in ferrosilicon synthesis also would minimize the landfill waste.

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Development of porous glass-ceramic using silica sand for wall tiles application

2023 , Mohd Hakim Ibrahim , Mohd Idham Mustaffar , Anis Nadhirah Ismail , Syarifah Aminah Ismail , Nabihah Othman

The objective of this study was to create porous glass–ceramic from natural silica sources and industrial waste for use as wall tiles. The silica sand and soda lime glass waste were milled and sieved separately before being mixed in the appropriate ratios with a foaming agent (PCC). The mixed sample was then pressed into a button shape and sintered at different temperatures. The samples were characterized using universal testing machine for mechanical analysis and XRD for phase analysis. The results found that modulus of rupture (MOR) and density decrease while water absorption and porosity increased as sintering temperature increase. It was indicated that it already achieves the minimum requirement of ISO 13006 standard in term of MOR at sintering temperature 800 °C to produce porous glass–ceramic for wall tiles.

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Processing of porous glass ceramic using silica sand and industrial waste for tiling application

2024-12 , Mohd Hakim Ibrahim , Mohd Idham Mustaffar , Syarifah Aminah Ismail , Nabihah Othman , Anis Nadhirah Ismail

The main goal of this research is to produce a porous glass ceramic from natural silica sources and industry waste to be used as tiling in building applications. Basically, silica sand is the raw material of natural silica while soda lime glass is the raw material of industrial silica. Both materials were mixed with carbonate foaming agent and clay binder. Then, the mixed samples were pressed into button shape. The button-shape samples were sintered at sintering temperatures of 800, 850, 900 and 950°C with natural cooling at room temperature for 24 hours. It was found that the highest bulk density and modulus of rupture (MOR) were obtained at 800°C with 1.91 g/cm3 and 21.97 MPa respectively, while the highest water absorption was obtained at 950°C with 16.37%. The surface morphology analysis showed that, as the temperature increased, the pores became larger and some of them merged and bonded together. However, the optimum sintering temperature was achieved at temperature 900°C recording to its lower density (1.75 g/cm3) and high MOR (19.64 MPa) that met the ISO 13006 standard's minimum requirement of higher than 15 MPa.

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The Correlation between Palm Shell Char Properties and the Production of Metallic Iron in EAF Steelmaking Slag Reduction Reaction

2020-11-24 , Anis Nadhirah Ismail , Nur Farhana Diyana Mohd Yunos , Sri Raj Rajeswari Munusamy , Muhammad Asri Idris

Palm shells wastes generated from oil palm processing are in abundance in landfills every year thereby posing environmental problems. Enormous amount of wastes generated by agro-industry has previously studied as carbon source in steelmaking hence providing solution to environmental problems. This paper studied on the conversion of palm shell waste into carbon material via physical and chemical activation method for metallic iron extraction. Physical char was prepared by pyrolyzed in nitrogen atmosphere at 450°C while chemical char was impregnated in phosphoric acid before pyrolyzed. Composite pellets of EAF slag (43.18 %Fe2O3) with physical and chemical char were rapidly heated at temperature 1550°C within 20 minutes under argon flow. All reduced samples were analyzed on the weight loss, degree of reduction, iron recovery and phase analysis using X-ray diffraction (XRD). The results indicated that chemical/slag showed higher weight loss (38.8%) and excellent degree of reduction (29.94%) compared to physical/slag due to higher volatile matter content (9.8%) and larger surface area (562.14m2/g). It was found that the production of metallic iron particles after the reduction process and indicated that chemical char achieved higher iron recovery (15.48%) compared to physical char due to higher total carbon content (60.28%). XRD and Rietveld refinement analysis confirmed that the iron phase was a major component in metallic iron particles for physical/slag and chemical/slag samples. This elucidated that the iron oxides in EAF slag was completely reduced into iron by using palm shell chars as carbon materials. This finding indicates that palm shell chars potentially act as carbon materials in steelmaking applications according to their good characteristics.

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