01. Araştırma Çıktıları | WoS | Scopus | TR-Dizin | PubMed

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Determination of the Optimal Process Parameters for Copper Solvent Extraction Using Robust Design Method
(Springer india, 2025) Abdelraheem, Mohamed Taha Osman; Agacayak, Tevfik
Copper (Cu) solvent extraction (SX) from sulphate leach solution was investigated using Robust design (Taguchi design). The effect of some parameters, including pH (1.25-5), phase ratio (O/A: 1/3-2/1), concentration of the extractant (2.5-10% v/v) and extraction duration (5-20 min) were examined. In the investigation of SX, the ranges and experimental parameters chosen are as follows: pH, 3.75; concentration of the extractant, 7.5% v/v; Aqueous /Organic ratio, 3/1 and extraction duration, 10 min. Under these conditions, Cu extraction of 94.62% was achieved. Variance analysis technique (ANOVA) suggested that, the most effective parameter was pH and the less effective parameter was the aqueous /organic ratio. Using of 1.5 M H2SO4 allowed for a stripping efficiency of 98% Cu from the organic phase.
Effect of Microwave Pretreatment on Oil Agglomeration of Lignite Using Different Bridging Oils
(Taylor & Francis inc, 2025) Duzyol, Selma; Inan, Kubra; Agacayak, Tevfik; Abdelraheem, Mohamed Taha Osman
This manuscript consists of two parts. In the first part, oil agglomeration experiments were carried out to enrich the lignite coal sample obtained from Tun & ccedil;bilek underground mine using 4 different binding oils such as kerosene, mineral oil, diesel oil and vegetable waste oil. The experimental parameters such as pH, stirring speed, oil concentration and agglomeration time were investigated in detail. The best results were obtained with vegetable waste oil, mineral oil, diesel oil and kerosene, respectively. In the second part, the oil agglomeration tests (under conditions where optimum results were obtained in the first part) were performed on the lignite coal samples after microwave treatment at different powers and times. The microwave pretreatment results revealed that some mass loss occurred in the coal sample and the ash content of the coal increased. Fourier transform infrared spectrometer (FTIR) was applied for the investigation of the chemical structure differences of agglomerates.
Citation - WoS: 12
Citation - Scopus: 12
Effect of Organic and Inorganic Compounds on Dissolution Kinetics of Chalcopyrite in Hydrogen Peroxide- Hydrochloric Acid System
(Elsevier, 2022) Abdelraheem, Mohamed Taha Osman; Agacayak, Tevfik
The addition of 2-Propanol as an organic substance and NaCl as an inorganic com-pound in hydrochloric acid with hydrogen peroxide as a strong leaching agent of chalcopyrite was investigated. The effects of the leaching parameters on copper extraction, such as stirring speed, H2O2 concentration, temperature, HCl concentration and solid/liquid ratio were studied. The max-imum final copper extraction of 54.55% was obtained with 600 rpm stirring speed, 1.5 M H2O2, 0.5 M HCl, 600 rpm, 50 C, 240 min of the reaction and particle size of -106 +75 mm. Further experiments were performed when the solid-to-liquid ratio (S/L), stirring speed, temperature, HCl,H2O2 and leaching time were kept constant to examine the influence of NaCl and 2-Propanol concentrations in the range of 0-0.5 M and 0-3 M, respectively. The results showed that the copper extraction was increased up to 58.11% with addition of NaCl. While copper extraction yield reached 94.25% in case of addition of 2-propanol with the optimum parameters(0.5 M HCl,50 C, 1.5 M H2O2, 600 rpm, particle size -106 +75 lm, solid liquid ratio 2g/L, 3 M 2-propanol). The chalcopyrite leaching in hydrogen peroxide- hydrochloric acid system was found to be described by the interface transfer and diffusion across the product layer with activation energy of 77.14 kJ/mol. Addition of 2-propanol suggested that the reaction was under product layer diffusion control and decreased the activation energy of chalcopyrite leaching to 67.98 kJ/mol. Crown Copyright (c) 2022 Published by Elsevier B.V. on behalf of King Saud University.
Citation - WoS: 9
Citation - Scopus: 9
Investigation of the Effect of Some Polar Organic Solvents on the Leaching and Dissolution Kinetics of Chalcopyrite in Hydrogen Peroxide and Sulfuric Acid Solution
(Chem Soc Ethiopia, 2023) Abdelraheem, Mohamed Taha Osman; Ağaçayak, Tevfik
The effect of acetic acid and ethanol as polar aqueous solvents on sulfuric acid with hydrogen peroxide as an oxidant was studied. A small amount of these polar aqueous solvents significantly improved the copper leaching recovery. The leaching parameters such as temperature, stirring speed, H2O2 concentration, solid/liquid ratio, H2SO4concentration and particle size were examined. About 76.33% as highest Cu extraction was gained with 2 M H2O2, 600 rpm stirring speed, 50 degrees C temperature, 1 M H2SO4, 240 min of the reaction and 75 x 53 mu m particle size fraction. Further experimental tests were carried out when the stirring speed, solid-to-liquid ratio (S/L), particle size, H2O2concentration, temperature and H2SO4concentration were kept constant to investigate the effect of ethanol and acetic acid concentration in the range of 0-2 M. The experimental results proved that the copper extraction recovery reached to 99.03% in 180 min of the reaction with 2 M acetic acid. While 2 M of ethanol increased copper extraction recovery up to 100% in 90 min of the leaching time. The dissolution reaction found to be described by mixed kinetic model and activation energy of 54.37 kJ/mol. Addition of acetic acid and ethanol suggested reaction controlled by diffusion across product layer.
Citation - WoS: 2
Citation - Scopus: 2
Kinetics Study on the Leaching of Metallic Silver With Ammonium Carbonate as an Eco-Friendly Alternative for Cyanide
(Springer, 2025) Aydogan, Salih; Abdelraheem, Mohamed Taha Osman; Ali, Babiker; Boyrazli, Mustafa
This article describes the dissolution kinetics of metallic silver (Ag) in ammonium carbonate and hydrogen peroxide (H2O2) solution. The influences of temperature, rotation speed, H2O2 concentration, and ammonium carbonate concentration were investigated. The results indicate that ammonium carbonate concentrations between 0.025 and 0.1 M have a significant impact on the dissolution rate. The dissolution rate is positively impacted by H2O2 concentrations between 0.025 M and 0.10 M. Furthermore, there is a positive relationship between the dissolution rate of Ag and the rotation speed. Silver dissolves more readily at temperatures between 20 degrees C and 55 degrees C. However, a temperature > 40 degrees C led to the formation of a silver carbonate layer on the disc when using high concentrations of hydrogen peroxide and ammonium carbonate. The activation energy of 11.10 kJ/mol was calculated, supporting the validity of the Levich equation, which is predicated on the suggestion that mass transfer control describes the extraction rate.
Citation - WoS: 4
Citation - Scopus: 4
Leaching Kinetics of Metallic Silver Using Di-Ammonium Tartrate and Hydrogen Peroxide Solution as a Greener Substitute for Cyanide
(SPRINGER, 2024) Aydogan, Salih; Abdelraheem, Mohamed Taha Osman; Ali, Babiker; Boyrazlı, Mustafa
The kinetic of dissolving pure metallic silver in di-ammonium tartrate with a hydrogen peroxide solution is discussed in this article. The effects of temperature, di-ammonium tartrate concentration, hydrogen peroxide concentration, and rotation speed were examined. The findings show that there is a favorable correlation between the rotation speed and the rate of silver dissolution. Moreover, a very tiny concentration of di-ammonium tartrate, between 0.005 and 0.125 M, has a beneficial impact. The dissolution rate is well-affected by hydrogen peroxide concentrations between 0.05 and 0.25 M, but not significantly so in the 0.25-0.35 M range. Temperatures between 20 and 50 degrees C have a positive effect because hydrogen peroxide is stable in this range. A measurement of 25.44 kJ/mol was made of the apparent activation energy.
Solvent Extraction of Copper from Sulfate Leach Liquor of Chalcopyrite Concentrate: Mitigation Strategies for Iron Coextraction
(Wiley, 2025) Abdelraheem, Mohamed Taha Osman; Agacayak, Tevfik; Aras, Ali; Taner, Hasan Ali; Duzyol, Selma
In this study, solvent extraction of copper (Cu) from sulfate leach liquor of chalcopyrite concentrate was investigated using LIX 984N as the extractant and kerosene as the diluent. The effects of pH (1-4.5), organic-to-aqueous phase ratio (O/A, 1/3-3/1), extractant concentration (3%-9% v/v), diluent type (kerosene, benzene, and hexane), and temperature (25 degrees C-55 degrees C) on the extraction efficiency were systematically evaluated. Stripping experiments were also carried out using sulfuric acid at different concentrations (0.75-3 M) and agitation rates (200-600 rpm). The results revealed that up to 98.1% of copper could be extracted at pH 4.5, O/A = 1, 6% (v/v) LIX 984N, and 25 degrees C when hexane was used as the diluent. However, a significant amount of iron (20%-28%) was also coextracted into the organic phase under similar conditions, which poses challenges for downstream electrowinning. Complete stripping of copper and iron was achieved at 1.5 M H2SO4 with the agitation of 500 rpm. These findings highlight the need for a preliminary iron removal step prior to solvent extraction to ensure selective copper recovery.

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