Pelin Altınkaya

• Master of Mining Engineering
• Reseacher at Outotec

The current paper introduces for the very first time recently invented electrodeposition-redox replacement (EDRR) method in continuous leaching-recovery-solution purification process. The mini-pilot study reveals that longer duration of the EDRR process is beneficial as it increases gold recovery per stage and decreases the specific energy consumpt...

Glycine has recently gained plenty of attention in gold processing as an alternative lixiviant to cyanide due to its non-toxicity, efficiency in metal dissolution as well as selectivity for valuable metals. This paper presents an investigation on the combination of agitated reactor leaching and recovery of gold from mildly refractory ore in cyanide...

Having a circular society where the residue generation is minimized is one of the challenges of our society. The mineral processing sector generates a large quantity of residues, e.g. flotation tailings, which are disposed of in tailings dams and ponds occupying a large land area and creating potential environmental problems, e.g. acid drainage or...

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....

The object of the current study was to compare the extraction yields of various valuable metals from process residues by ferric and cupric chloride leaching as an alternative to cyanidation. Flotation tailings, with low amount of gold, copper, nickel, cobalt and zinc were used as a raw material. In the chloride leaching experiments, the effect of t...

With decreasing ore grades, the tailings of mining operations are becoming of increasing interest as metal-containing secondary raw materials. The objective of the current work was to investigate chloride leaching of gold, copper, cobalt, nickel, and zinc present in the flotation tailings. In the current study, the effect of cupric ion as an oxidan...

This study focuses on investigating the extraction of gold, copper, iron, nickel, cobalt, and zinc present in the flotation tailings. The studied sample contained iron (3.56%), copper (0.09%), and gold (0.2 ppm) as major target elements, whereas cobalt (0.04%), nickel (0.03%) and zinc (0.04%) were trace elements of interest. Primarily, bioleaching...

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...

The SOCRATES project targets metallurgical processes, including plasma-, bio-, solvo-, electro-and ionometallurgy for the treatment of industrial process residues, that can be integrated in environmentally friendly, near-zero-waste* valorisation flow sheets. By unlocking the potential of these secondary raw materials, SOCRATES contributes to a more...

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...

Despite of being the most common hydrometallurgical process for extraction of gold from ores and concentrates, cyanide leaching is blamed for its hazardous impact on environment and human health. These concerns have given a rise for alternative cyanide-free technologies, such as cupric chloride leaching. However, the state-of-art processes for gold...

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...

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...

In this study, the characterisation of physical and chemical refractoriness of an arsenical silver ore to the extraction of silver by cyanide leaching was investigated. The mineralogical analysis of the ore indicated that the ore is composed of mainly quartz, barite, mica and the group of clay mineral. Silver content of the ore was determined to be...

In this study, the characterisation of physical and chemical refractoriness of an arsenical silver ore to the extraction of silver by cyanide leaching was investigated. The mineralogical analysis of the ore indicated that the ore is composed of mainly quartz, barite, mica and the group of clay mineral. Silver content of the ore was determined to be...

In this study, the recovery of silver from an arsenical silver ore was investigated using a laboratory type Knelson Concentrator and cyanide leaching. Silver was found to be as acanthite, which occurs both as free grains and closely associated with other mineral phases such as quartz, barite, mica and the group of clay minerals. Gravity tests have...

ABSTRACT: In this study, amenability of an antimonial refractory gold/silver ore and an arsenical silver ore to thiourea leaching was investigated. Previous studies on the cyanide leaching of these ores resulted in low extractions of gold and silver confirming the refractory nature of these ores. The thiourea leaching tests (26% w/w pulp density, p...

In this study, the preg-robbing characteristics of a copper-rich gold ore and a pyritic gold ore were evaluated based on the adsorption of gold by ore from the spiked solutions (0-5 mg/L Au). A free milling gold ore and a "synthetic" preg-robbing gold ore, which was prepared by adding activated carbon to the free milling gold ore, were also tested...