Abstract
Electric Arc Furnace steel slag (EAFS) is the waste produced in steelmaking industry. Environmental problem such as pollution will occur when dumping the steel slag waste into the landfill. These steel slags have properties that are suitable for various applications such as water treatment and wastewater. The objective of this study is to develop efficient and economical chlorination route for EAFS extraction by using leaching process. Various parameters such as concentration of hydrochloric acid, particle size of steel slag, reaction time and reaction temperature are investigated to determine the optimum conditions. As a result, the dissolution rate can be determined by changing the parameters, such as concentration of hydrochloric acid, particle size of steel slag, reaction time and reaction temperature. The optimum conditions for dissolution rates for the leaching process is at 3.0 M hydrochloric acid, particle size of 1.18 mm, reaction time of 2.5 hour and the temperature of 90°C.
Highlights
Steelmaking is the process of manufacturing steel by using iron ore and other elements
A test on sample of electric arc furnaces (EAF) slag was conducted by using a scanning electron microscope to collect the morphology, crystalline structure and orientation of based material creating the EAF slag sample at an accelerating voltage of 20.0 kV, beam current of 50 mA and working distance of 9.0 mm – 10.0 mm with utilization of backscattered electrons (BSE) set objectively with aperture of 3 [7]
The analysis identifies calcium oxide (CaO), silicon oxide (SiO2), hematite (Fe2O3), manganese (III) oxide (Mn2O3), magnesium oxide (MgO), aluminium oxide (Al2O3), phosphorus oxide (P2O5), metallic iron (Fe), srebrodolskite (Ca2Fe2O5), dicalcium silicate (Ca2SiO4) and pyroxene (CaAl2SiO6)
Summary
Steelmaking is the process of manufacturing steel by using iron ore and other elements. Two commonly used steelmaking process are basic oxygen and electric arc furnaces (EAF). BOF uses iron ore from the mining as the raw material for the process while the main raw material for EAF is steel scrap [1]. In Malaysia, EAF is widely used in steel mills. EAF slags are formed from the manufacturing of molten steel [2]. Ferric Chlorides could be extracted from EAF steel slags that are used to remove phosphate from wastewater which cause the eutrophication. With the increase in microorganisms such as algae, the oxygen composition in the water will decrease and killing fish and reducing water quality [3]
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