Alim Gül

RECOVERY OF Co, Ni, AND Cu FROM THE TAILINGS OF DIVRIGI IRON ORE CONCENTRATOR

In the Sivas-Divriği Iron Ore Concentrator, 600,000 t of tailings are discarded annually. There are already 1 million t of tailings deposited in ponds from the previous production activities. The presence of Co, Ni, and Cu in the tailings makes the beneficiation of those tailings attractive. In the experimental work, sulphide concentrates were produced from these two types of tailings by flotation. Under optimum flotation conditions, a bulk sulphide concentrate assaying 0.376% Co, 0.721% Ni, and 0.403% Cu was obtained with 83.1% Co, 57.7% Ni, and 59.0% Cu recoveries from the old tailings. On the other hand, another concentrate containing 0.384% Co, 0.687% Ni, and 0.393% Cu was produced under the same flotation conditions with 94.7% Co, 84.6% Ni, and 76.8% Cu recoveries from the new process tailings.

Beneficiation of the gold bearing ore by gravity and flotation

Gold concentration usually consists of gravity separation, flotation, cyanidation, or the combination of these processes. The choice among these processes depends on the mineralogical characterization and gold content of the ore. Recently, the recovery of gold using gravity methods has gained attention because of low cost and environmentally friendly operations. In this study, gold pre-concentrates were produced by the stepwise gravity separation and flotation techniques. The Knelson concentrator and conventional flotation were employed for the recovery of gold. Gold bearing ore samples were taken from Gümüşhane Region, northern east part of Turkey. As a result of stepwise Knelson concentration experiments, a gold concentrate assaying around 620 g/t is produced with 41.4wt% recovery. On the other hand, a gold concentrate about 82 g/t is obtained with 89.9wt% recovery from a gold ore assaying 6 g/t Au by direct flotation.

The Effect of Collector's Type on Gold and Silver Flotation in a Complex Ore

Gold and silver are recovered by gravity concentration, cyanidation, or flotation from ores. The choice of those processes depends on the mineralogical characterization as well as gold and silver contents of the ore. Flotation has been applied on ores containing free gold and silver particles for many years. The flotation efficiency of gold and silver particles depends on the modifiers and collectors. This paper presents the results of the effect of different collector combinations on gold and silver recoveries from lead and zinc ores by flotation. Best results were obtained on the use of Aero 208 + Aerophine 3418 A as collectors at the dosages of 350 + 350 g/t and 1000 g/t Na2SiO3 as a depressant at pH 4.5 where particle size was below 38 µm. According to the process, a concentrate assaying 1026.9 g/t Au and 10185 g/t Ag was obtained. On the other hand, a concentrate containing 50.6% Pb was obtained with 39.7% recovery using potassium amyl xanthate (KAX) and aminothiophenol (ATP). This concentrate graded 235 g/t Au and 3740 g/t Ag.

USE OF NON-TOXIC DEPRESSANTS IN THE SELECTIVE FLOTATION OF COPPER-LEAD-ZINC ORES

Abstract This paper reports the results of flotation tests conducted with a copper-lead-zinc sulphide ore. The major sulphide minerals in the ore are chalcopyrite, galena, sphalerite, marmatite and pyrite with corresponding metal amounts of 6.80% Pb, 1.05% Cu and 1.50% Zn, respectively. The ore sample was ground to below 200 ?m and then collective and selective sulphide flotation tests were performed. In flotation tests, depression was achieved using non-toxic reagents and consequently individual copper, lead and zinc concentrates assaying 31.68% Cu, 67.69% Pb, 49.79% Zn were obtained with 72, 80 and 57% metal recoveries, respectively. Ce document rend compte des résultats d’essais de flottation effectués avec un minerai de sulfure de cuivre-plomb-zinc. Les principaux minéraux sulfurés du minerai sont la chalcopyrite, la galène, la fausse galène, la marmatite et la pyrite, avec des quantités correspondantes de métaux de 6.80% Pb, 1.05% Cu et 1.50% Zn, respectivement. On a moulu l’échantillon de minerai sous 200 ?m et l’on a ensuite effectué des essais de flottation collective et sélective du sulfure. Lors des essais de flottation, on a obtenu la dépression en utilisant des réactifs non toxiques et, conséquemment, on a obtenu des concentrés individuels de cuivre, de plomb et de zinc titrant à 31.68% Cu, 67.69% Pb et 49.79% Zn avec une récupération du métal de 72, 80 et 57%, respectivement.

THE ROLE OF NA2S2O5 AND ACTIVATED CARBON ON THE SELECTIVE FLOTATION OF CHALCOPYRITE FROM A COPPER ORE USING A DITHIOPHOSPHINE-TYPE COLLECTOR

This article presents the results of an investigation into the effects of sodium meta bi-sulphite (Na2S2O5) and activated carbon on the selective flotation of chalcopyrite from pyrite. In Küre Copper Concentrator, a chalcopyrite concentrate is produced with around 17.5% Cu content using lime as a depressant. Flotation tests conducted in this investigation employ Na2S2O5 and activated carbon as regulating reagents and reveal that Cu grades up to 28% could easily be achieved. The deactivation mechanism of S2O5 2− may be similar to that of SO3 2− such that the decomposition of the collector and/or oxidized surface species may be effective on selectivity. Activated carbon removes collector species from the pulp, creating collectorless flotation conditions. Conditioning time is an important parameter on selectivity and decreases the dosage of Na2S2O5 used.

LEACHING OF MASSIVE RICH COPPER ORE WITH ACIDIFIED FERRIC CHLORIDE

Massive rich copper ore, taken from the Küre region of Turkey and containing 7.95% Cu, 2.13% Pb, 0.341% Zn, 0.087% Co, 0.039% Ni, 0.9 (g/t) Au, and 17 (g/t) Ag, was subjected to the experimental study. Effects of leaching time, ferric ion concentration, solid/liquid ratio, acid concentration and temperature on the metal dissolution efficiencies were investigated in order to determine optimum leaching conditions and related leaching kinetics. As a result of these experiments carried out under the optimum leaching conditions, 76% of Cu, 55% of Co, 96% of Ni, 100% of Pb, and 91% of Zn were extracted. The value of apparent activation energy for copper dissolution was found as 43.8 kJ/mole, which is in agreement with the published data. The rate-controlling step was found as the diffusion of ferric ions into the sulfur layer formed on the surface of partially leached ore particles.