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Öğe Efficient Zinc Removal from Blast Furnace Sludge Using Choline Chloride–Malonic Acid: Towards Sustainable Recycling of Iron Extraction Waste(2023) Kul, Mehmet; Oskay, Kürşat Oğuz; Doğan, Mehmet; ASLAN,NevzatChemical components of blast furnace sludge (BFS) of iron blast furnaces become a recyclable raw material in the furnace when a few contents including zinc (Zn) are selectively removed. Out of four deep eutectic solvents (DES) preselected from the literature for their potential selective Zn leaching performances, choline chloride–malonic acid was determined to be the most efficient DES for its efficiency in removing Zn from BFS in the presence of iron (Fe). Further preliminary tests were conducted via iterations of leaching parameters to determine their individual effects on the leaching efficiencies for Zn, Ca, and Fe. Parameters like DES concentration, leaching period, and solid/liquid ratio were found to be the most accountable, as agitation speed and temperature showed only a slight influence on the efficiencies. For a maximum Zn removal of about 85% with the least amount of Fe of around 15%, the empirical parameters without any extra optimization were estimated to be 30 vol.% malonic acid concentration, ¼ (g/mL) solid/liquid ratio, 100 rpm agitation speed, 60 C leaching temperature, and 3.0 h leaching period.Öğe The effect of microbubbles on coarse particle anionic flotation: analysis and optimization(2023) Abbaker, Ahmed Mohammed E; ASLAN,NevzatSince the grinding and chemical reagents required for flotation are expensive, coarse particle flotation reduces grinding costs and makes the subsequent process more accessible and cheaper. Recent studies suggest that the flotation of coarse particles using microbubbles has some advantages. However, a thorough analysis of the effectiveness of various flotation parameters and the impact of their interactions on the recovery of coarse particles in the presence and absence of microbubbles has yet to be fully understood. In the current study, the two-level factorial and Box-Behnken experimental designs were performed to characterize, assess, and optimize the implications of seven numerical (sodium oleate, collector; calcium oxide, activator; MIBC, frother; impeller speed; froth depth; pulp concentration; fine particles) and one categorical (microbubbles) independent parameters on the coarse quartz particles. Characterization revealed that froth depth did not significantly affect the flotation recovery of coarse particles in the mechanical laboratory cell. The effects of the variables in the presence of microbubbles revealed that sodium oleate and impeller speed significantly impacted recovery, followed by calcium oxide and fine particles, both of which had a medium influence, and MIBC and pulp concentration, which had a minimal impact. The recovery of coarse particles increased by 92.714% when microbubbles were used, compared to the estimated maximum recovery under ideal conditions of 62.258% without them. From this, it can be concluded that a high coarse particle flotation recovery is possible by optimizing the hydrodynamic conditions and the chemical environment using microbubbles.
