Haci Deveci

Haci Deveci
Karadeniz Technical University · Department of Mining Engineering

Prof. Dr. in Hydrometallurgy & Minerals Engineering

About

194
Publications
261,508
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Introduction
Haci Deveci currently works as Full Professor at the Minineral&Coal Processing Division of the Department of Mining Engineering, Karadeniz Technical University. Haci does research in Hydrometallurgy, Minerals Engineering, Extractive Metallurgy, Chemical Engineering, Environmental Engineering and Mining Engineering. The current project is 'BIOTECHNOLOGICAL APPROACH FOR RECOVERY OF RARE EARTH ELEMENTS AND PRECIOUS METALS FROM E-WASTE – (BIOREEs).'
Additional affiliations
March 2013 - March 2016
Karadeniz Technical University
Position
  • Head of Department
September 2001 - present
Karadeniz Technical University
Position
  • Principal Researcher/Lecturer in Hydrometallurgy

Publications

Publications (194)
Article
The leaching of metals from waste printed circuit boards (WPCBs) in cupric chloride solutions (HCl-CuCl2-NaCl) was studied. Effects of initial concentration of cupric (8-157 mM Cu2+), chloride (0.7-2.0 M NaCl), temperature (20-80°C), solids ratio (1-15 w/v) and air/oxygen (1 L/min) on the leaching of copper as well as other metals (i.e. Fe, Ni, Ag,...
Conference Paper
Full-text available
The downstream treatment of chloride leach solutions of WPCB for recovery of base and precious metals by a combination of adsorption and precipitation processes were carried out. A synthetic leach solution (1 M HCl, 116.5 g/L Cl-, 30 g/L Cu2+, 2.5 g/L Fe3+, 5 mg/L Au3+, 10 mg/L Ag+ and 20 mg/L Pd2+), which was prepared based on the composition of t...
Conference Paper
Full-text available
In this current study, the extraction of gold from a high grade copper-rich gold ore by copper-assisted ammoniacal thiosulphate leaching was studied by adopting Taguchi L 9, (3 3) experimental design approach. The effects of concentration of thiosulphate, (10-500 mM S 2 O 3 2-), copper (0-25 mM Cu 2+), and ammonia (5-1000 mM NH 3) on the extent of...
Article
Full-text available
A scanning electron microscope (SEM) study was performed to provide a visual insight into the oxidation patterns of sulfide minerals during chemical and bacterial leaching of a complex ore for 3 days. The mineral grains were studied under SEM before and after bacterial and chemical leaching with or without the addition of ferrous iron to generate f...
Article
The nature of the hydrothermal reaction between sphalerite (ZnS) and pyrite (FeS2) particles and copper sulfate (CuSO4) solution was investigated in this study. The effects of temperature (443–523 K), CuSO4 (0.08–0.96 mol/L) and H2SO4 (0.05–0.6 mol/L) concentrations, reaction time (1–120 min), stirring speed (40–100 rpm) and particle size (10–100 μ...
Article
In recent years, the demand for silver has increased due to its use in green technologies such as photovoltaic cells and electric vehicles (EVs). Due to environmental concerns associated with the use of cyanide leaching for gold/ silver production, alternative lixiviants have received particular attention with thiosulphate having been often quoted...
Article
This study was conducted to determine the effectiveness of three different adsorbents for the adsorption of gold from a real cyanide leach liquor. An activated carbon (NORIT GAC 1240), a strong base (Purogold A194), and a weak base (Purogold S992) resins were tested as the adsorbents. The pregnant leach solution (PLS) was derived from cyanide leach...
Article
Production of gold from copper-rich gold ores has received particular attention due to some technical and economic challenges associated with the ready dissolution of most copper minerals during cyanide leaching. This leads to excessive consumption of cyanide by forming copper cyanide complexes, which adversely affect downstream recovery and cyanid...
Article
Full-text available
Recovery of gold from copper-rich gold ores has proved challenging. Dissolved copper in cyanide deficit leach solutions severely interferes with adsorption of gold onto activated carbon or ion exchange resins resulting in low recoveries. In this study, the efficiency of different adsorbents for selective recovery of gold from the copper-containing...
Article
Bioleaching of copper from electronic waste (e-waste) in the form of high grade waste printed circuit boards (WPCBs) collected from obsoletemobile phones is assessed using a consortium of iron (Fe2+) & sulphur (Sº) oxidizing bacteria in a semi-pilot reactor system. Results from the study indicated that the microorganisms were able to grow in the pr...
Article
Extraction of cobalt, copper, and silver from scrap saw-blade segments using nitric acid solutions (0.1–0.4 M, 20–60°C) were investigated using response surface methodology. Extraction of cobalt and iron was more extensive than copper and silver, i.e., 35.7–96.2% Co and 72.6–100% Fe versus 8.50–35.4% Cu and 8.11–22.5% Ag. Statistical analysis of th...
Article
Abstract Waste electrical and electronic equipments (WEEE or e-waste) are an important source for rare earth elements (REEs). Among various type of WEEE, NdFeB magnets are known for their high content of neodymium (Nd) and dysprosium (Dy). Recovery of REEs from NdFeB magnets is of prime interest for the industry to meet the ever-growing demand for...
Article
This research elucidates the geochemical behaviour of cemented paste backfill (CPB) of sulphide-rich tailings (S-rT). The dynamic-tank leaching test was performed on the CPBs for up to 360 days. The CPBs with the alkaline industrial by-products (AIPs) produced relatively lower acidity, Ec and SO4 ²⁻ than the Control. The AIPs replacement appeared t...
Article
Cyanide leach solutions produced from gold/silver ores can be contaminated with zinc due to the gold/silver cementation in Merrill-Crowe process and/or the dissolution of zinc minerals present in the ore. Zinc levels in cyanide solutions should be controlled to avoid potential problems in leaching and downstream processes associated with the accumu...
Conference Paper
Full-text available
Diagnostic leaching is a very useful analytical tool for determination of the distribution of free and refractory gold within different phases. In this study, the amenability of a gold and silver bearing refractory flotation tailings to cyanide leaching was investigated. Diagnostic leaching tests were performed to examine the rationale behind the r...
Conference Paper
Full-text available
During cyanide leaching of gold ores, most copper minerals present in the ore readily dissolves by forming copper(I)-cyanide complexes, which results in excessive cyanide consumption coupled with low gold extractions. Intensive cyanidation at high cyanide concentrations (CN:Cu>4) is often required to achieve acceptable gold extractions. Process eco...
Article
In this study, a detailed characterization of an extremely complex arsenical silver ore using mineral liberation analysis and diagnostic leaching for identification and occurrence of silver phases is presented. Mineralogical analysis of the ore has shown that silver is present mainly as acanthite and to a small extent as Fe-Pb-Ag-Zn arsenate/oxide....
Conference Paper
Full-text available
In this study, the effects of ultra-fine grinding (from 27 µm (d 80 , as-received) to 7.5 µm), cyanide concentration (2-5 g/L NaCN) and pulp density (30-50% w/w) on the rate and extent of extraction of gold and silver were studied. The tailings (d 80 =27 µm) used in the leaching tests contained 17.8 g/t Au, 99.5 g/t Ag, 6.4% Zn, 9.1% Fe and 560 g/t...
Article
Full-text available
Gold production from copper-rich gold ores is increasing at worldwide. Owing to the high dissolution of copper minerals in cyanide solutions, technical and economic difficulties have been faced in treatment of those ores. Gold extraction from ores that contain >0.5% Cu is often uneconomic by traditional cyanide leaching. High cyanide concentrations...
Article
Full-text available
Waste electrical and electronic equipment (WEEE) contains economically significant levels of precious, critical metals and rare earth elements, apart from base metals and other toxic compounds. Recycling and recovery of critical elements from WEEEs using a cost-effective technology are now one of the top priorities in metallurgy due to the rapid de...
Article
Full-text available
Özet: Mikro analitik teknikler, cevher karakterizasyon çalışmalarında yaygın bir şekilde kullanılmaktadır. Altın cevherlerinin, özellikle refrakter altın cevherlerinin karakterizasyonunda da etkin bir şekilde kullanılan bu teknikler, doğruluk ve hassasiyeti yüksek oldukça faydalı bilgiler sunmaktadır. Cevher hakkındaki bu bilgiler doğru proses seçi...
Conference Paper
Full-text available
Copper-bearing gold ores have proved difficult to treat in conventional cyanide leaching process owing to prohibitively high consumption of cyanide by readily soluble copper minerals interfering with gold extraction. Cyanide leaching of gold from copper-rich ores can be improved by intensive cyanidation or application of physical and chemical pre-t...
Conference Paper
Full-text available
There are increasingly stricter environmental regulations imposed for use of cyanide leaching for the extraction of gold from ores. Alternative lixiviants to cyanide, preferably with low toxicity, have been extensively studied. Thiosulphate has emerged as one of the most suitable alternative leaching agent in place of cyanide due to its low toxicit...
Conference Paper
Full-text available
Recycling of WEEE has already gain prime importance from both environmental and economic point of view. For the recovery of metals from e-waste, many conventional physical, bio/hydrometallurgical and pyrometallurgical processes are proposed. Economic potential of e-waste is mainly driven by its precious metal content. Physical separation methods (e...
Article
A comparison of various approaches evaluated to process spent lithium ion batteries to extract metals has been carried out. The leaching is carried out with sulphuric acid in the presence and absence of reductant, thus defining the role of reducing agent (NaHSO3 and H2O2) in assisting dissolution of all metals, especially Co and Mn. As the direct p...
Article
This study presents the utilisation of finely ground construction and demolition waste (CDW) as partial replacement (5-15 wt.%) to sulphide tailings on the short- and long-term strength, durability (i.e. no loss of strength) and microstructural properties of cemented paste backfill (CPB) over a curing period of 360 days. The CPB samples containing...
Article
Thiosulphate leaching has received particular attention in recent years as an environmentally benign alternative tocyanideleaching.Inthisstudy, thiosulphateleachingcombined withultra-finegrinding(UFG)wasstudiedfor silver extraction from an arsenical refractory ore. Direct cyanidation of the ore (d80: 50µm) led to a low silver extraction of≤70% over...
Article
Full-text available
Thiosulphate leaching offers several advantages over cyanidation such as low toxicity, high selectivity and fast leaching kinetics as well as it provides high extraction performance for gold in certain refractory ores. However, the main obstacles for commercialisation of thiosulphate leaching are its complex leach chemistry and lack of a highly eff...
Article
Full-text available
Siyanür liçi işlemleri sonucu üretilen atık çözeltiler, siyanür içeriğinin yasal sınırlara indirilebilmesi için arıtma işlemine tabi tutulmaktadır. Siyanür geri kazanımı ekonomik ve çevresel nedenlerden dolayı, özellikle siyanür tüketimi yüksek cevherler için en çok tercih edilen seçenektir. Bu çalışmada, alkali çözeltilerde hidrojen siyanürün (HCN...
Article
Full-text available
Thiosulphate leaching offers several advantages over cyanidation such as low toxicity, high selectivity and fast leaching kinetics as well as it provides high extraction performance for gold in certain refractory ores. However, the main obstacles for commercialisation of thiosulphate leaching are its complex leach chemistry and lack of a highly eff...
Article
Cyanide leaching is the most common method used for production of silver from gold/silver ores. Silver (and gold) can be recovered from pregnant leach solutions (PLSs) using Merrill-Crowe process (zinc cementation) and activated carbon adsorption. Due to their inherent limitations and paucity of selectivity, development of alternative processes for...
Article
Günümüzde, cevherlerden altın üretiminde en yaygın (>%90) olarak tercih edilen yöntem siyanür liçidir. Siyanür liçi, 19. yüzyılın sonlarından itibaren endüstriyel olarak kullanılmaktadır ve liç kimyası iyi bilinmektedir. Bununla beraber özellikle son yıllarda, siyanürün yüksek derecede toksik özelliğe sahip olmasına bağlı olarak artan çevresel kayg...
Article
Today, the most common (>%90) method preferred for production of gold from ores is cyanide leaching. Cyanide leaching with its well-known chemistry has been used industrially since the late 19th century. Restrictions have come into force particularly in recent years due to ever increasing environmental concerns for high toxicity of cyanide. Europea...
Conference Paper
Full-text available
Nitric acid is a strong oxidant capable of rapidly oxidizing sulphide minerals. This study was undertaken to evaluate the nitric acid leaching as a potential pre-treatment process prior to cyanidation of refractory gold/silver ores. The nitric acid pre-treatment experiments for refractory silver ore and gold/silver concentrate were performed for 2....
Conference Paper
Full-text available
This study investigated leaching of metals i.e. Cu, Co and Zn from flotation tailings of a copper smelter slag using sulphuric acid solutions in the absence/presence of hydrogen peroxide. The as-received tailings (d80: 70 µm) contained 1.25% Cu, 1.26% Co, 3.80% Zn and 36.5% Fe. The effect of addition of hydrogen peroxide (149 kg H2O2 per tonne soli...
Article
In this study, a closed loop two-stage leaching process has been experimentally and theoretically established for the selective dissolution of metals from electrode material of spent Ni-MH batteries. In the first step, baking parameters, such as temperature, acid concentration, and duration were optimized as 300 °C, 2 mL H2SO4 for 1.5 g of cathode...
Chapter
Mineral processing methods, such as flotation, are used to treat low-grade ores from mining operations; however, a significant amount of tailings are then generated (typically 95–98% of the feed ore). Therefore, mineral processing must also be essentially regarded as a “waste/tailings management” project (Ercikdi et al. 2012). The disposal, stabili...
Conference Paper
Full-text available
Electrowinning (EW) is deemed to be a viable option for recovery of copper from pregnant leach solutions (PLS) (>25 g/L Cu) of waste of printed circuit boards (WPCB) derived from peroxide assisted sulphuric acid leaching. However, EW is an energy intensive process and adversely affected by impurities such as Fe3+ present in PLS. In this study, reco...
Conference Paper
Full-text available
During oxidative leaching of e-waste (i.e. waste of printed circuit boards) in H2SO4+H2O2/O2 solutions, in addition to copper, silver is also dissolved at certain levels. Precipitation of silver from synthetic sulphate leach solutions in the absence/presence of copper by addition of sodium chloride was studied in this work. Central composite design...
Conference Paper
Full-text available
Bioleaching can be suitably exploited for the treatment of difficult-to-treat ores and concentrates. In this study, bioleaching of two different concentrates (a bulk Zn/Pb concentrate and zinc concentrate with high iron content) was studied to demonstrate the importance of mineralogical characteristic with particular reference to iron content. Biol...
Conference Paper
Full-text available
Extraction of base/precious metals (Cu/Fe/Ni/Pb/Sn/Au/Ag/Pd) from waste of printed circuit boards (WPCB) was investigated in sulphate and chloride solutions under oxidising conditions. WPCB sample contained 18.5% Cu, 86 g/t Au, 694 g/t Ag and 97 g/t Pd. Chloride leaching tests were conducted under the conditions of 1 M HCl, 47 g/L Cl-, 1% w/v solid...
Conference Paper
Full-text available
Abstract: In this study, recovery of cobalt from a copper flotation tailing (pyrite concentrate) by oxidative acid leaching was investigated. The as-received tailings (d80: 64 μm) contained 6407 g/t Co, 3547 g/t Cu, 21.4% Fe and 1705 g/t Zn. Leaching tests were carried out using different mineral acids under oxidising conditions (i.e. H2SO4+H2O2, H...
Conference Paper
Full-text available
In recent years, public concern and environmental pressures on the use of cyanide in gold leaching have ever increased due to high toxicity of cyanide itself. Thiosulphate is often promoted as an environmentally friendly and promising alternative to cyanide due to its low toxicity and cost. However, one of the detractions to thiosulphate leaching i...
Conference Paper
Full-text available
Cyanide leaching has proved the most efficient method for extraction of gold and silver from their ores. However, it is not a selective process in that, in addition to gold, silver and other metals also dissolve to a varying extent depending on their occurrence within the ore. Silver behaves similar to gold in the most stages of leaching and recove...
Conference Paper
Full-text available
Cobalt is produced mainly as a by-product from extraction of nickel laterites and copper-cobalt which often treated with sulphuric acid leaching. Selective recovery of cobalt from nickel and/or copper-bearing pregnant leach solutions can be achieved by oxidation of Co2+ to Co3+ since Co3+ precipitates as cobalt hydroxide/oxyhydroxide at pH 3.0. How...
Conference Paper
Full-text available
In this paper, a brief overview of the effect of temperature on the electrowinning of copper was provided. Furthermore experimental data for the influence of temperature on current efficiency, energy consumption, rate and morphology of Cu deposition in the electrowinning of copper from a synthetic copper sulfate solution were also presented. Temper...
Conference Paper
Full-text available
The leach solutions of waste of printed circuit boards (WPCB) may contain a wide range of base and precious metals with different concentrations due to heterogeneity of these wastes in composition. Therefore, selection of a suitable metal recovery method is of practical importance for downstream processing of pregnant leach solutions of WPCB. Sulph...
Article
Full-text available
Waste electrical and electronic equipments (WEEE or e-waste) contain hazardous organic and inorganic substances. On the other hand, WEEE is an important secondary resource due to its base (mainly Cu) and precious metal (Au, Ag and Pd) content. Improper management of this waste stream leads to economic losses as well as environmental pollution if di...
Article
Waste electrical and electronic equipments (WEEE or e-waste) contain hazardous organic and inorganic substances. On the other hand, WEEE is an important secondary resource due to its base (mainly Cu) and precious metals (Au, Ag and Pd) content. Improper management of this waste stream leads to economic losses as well as environmental pollution if d...
Article
The present work focuses on a two-step process for selective dissolution of metals from cathode active material of spent LIBs. Cathode powder baked at 300 °C using H2SO4 being subjected to first stage leaching with water extracted 78.6% Li, 80.4% Co in 60 min at 75 °C and 25% pulp density; recovery of Ni and Mn being low (<15%). In second stage, re...
Article
The present work focuses on the processing of cathode active material of spent lithium ion batteries to improve the recovery of constituent metals using reducing agents. Reductants enhance the solubility of metals, which hitherto have been solubilised to a lesser extent using only acid as leaching agent. Thus, we have investigated sulfuric acid lea...
Article
Full-text available
In this paper, the electro-winning of copper from synthetic copper sulphate solutions and the pregnant leach solution (PLS) derived from the leaching of e-waste was investigated in an attempt to reduce energy consumption by using a polyoxometallate (POM), ammonium metatungstate hydrate (AMTH) as a novel additive. Effect of addition of AMTH on the c...
Conference Paper
Full-text available
In this study, centrifugal gravity separation for recovery of silver and barite from the plant tailings of a refractory silver ore was tested using a Knelson Centrifugal Concentrator. The tailings sample (133 g/t Ag) is composed of predominantly quartz and barite (BaSO4, 17%). Native silver, pyrargyrite, tetrahedrite, argentite and proustite are th...
Conference Paper
Full-text available
Direct cyanide leaching of copper-bearing gold ores/concentrates results in low gold extractions (<80%) with high consumption of cyanide due to the ready dissolution of some copper minerals in cyanide solutions. To achieve high gold extractions, relatively concentrated cyanide solutions (i.e. intensive cyanidation) is used. Physical encapsulation o...
Article
The effect of activator type, concentration and slag composition on the strength and stability properties of paste backfill (CPB) of high-sulphide tailings using alkali-activated slag (AAS) as binder (7 wt.%) were investigated in this study. Acidic and neutral (AS-NS) slags were activated with liquid sodium silicate (LSS) and sodium hydroxide (SH)...