extraction of gold frm concentrate

gold processing - Mining and concentrating | Britannica

gold processing - gold processing - Mining and concentrating: The nature of the ore deposit determines the mining and mineral processing techniques applied. Oxide ore deposits are frequently of such low grade (e.g., 3 to 10 parts per million) that extensive mineral processing cannot economically be justified. In this case they are merely shattered by explosives and then …

gold extraction process from copper concentrate

Gold extraction WikipediaGold extraction refers to the processes required to ... developed the MacArthur-Forrest Process for the extraction of gold ores. ... (e.g. copper) concentrate, ...Coppe&gold extraction process from copper concentrate

Gold Ore Roasting Techniques - Mineral Processing & …

It was later found that 94 per cent of the gold in a 1.92-oz. concentrate could be extracted by quenching in water alone without the use of any cyanide at all. It is known that gold forms soluble sulpharsenate and polysulphide …

[PDF] Roasting and chlorine leaching of gold-bearing ...

Abstract This paper deals with gold extraction from a refractory concentrate by chlorine leaching. The process considers a pre-treatment of refractory materials by low temperature oxidation carried out with low oxygen concentration. The oxidized material is treated by leaching with brine. After gold adsorption/reduction onto activated carbon, iron and base metals can be …

Environmentally friendly extraction of gold from ...

Copper – ethylenediamine – thiosulfate leaching is described as an alternative green way of gold extraction. • Under optimal conditions, a gold extraction efficiency of 80.3% is achieved. • The developed low-cost and environmentally friendly method is almost as effective as cyanidation.

Stepwise extraction of gold and silver from refractory ...

In view of the above problems, a novel method for extracting gold from refractory gold concentrate calcine through stepwise extraction by thiourea leaching is proposed in this paper, with its conceptual flow-sheet shown in Fig. 1.During the first leaching stage, the consumption of thiourea can be effectively decreased by adding suitable additives into thiourea solution.

Pressure Oxidation of a Refractory Sulfide Concentrate and ...

A 98% gold extraction and 95.7% silver extraction was realized as compared to 92.5% and 7.1% gold and silver extraction, respectively, under the best pressure leach conditions without a lime boil. X-ray diffraction analysis of …

(PDF) Use of Ozone for Gold Extraction from a Highly ...

The use of ozone for gold extraction from a highly refractory concentrate has been reported [8]. They concluded that the ozone pretreatment also decreased the cyanide consumption due to …

The extraction of gold from sulfide concentrates into ...

The results of investigation of the extraction of gold from mineral sulfide ore into molten lead at low temperatures (350–550°C) are given. The questions of solubility of Au in Pb in the mentioned temperature range and the kinetics of dissolution of metal are analyzed. The condition that determines extraction of gold is the presence of a processing medium, which …

Leaching of gold from a chalcopyrite concentrate by ...

A gold containing chalcopyrite concentrate has been treated with thiourea using H 2 SO 4.The effects of some leach parameters such as thiourea concentration, oxidizing agents, redox potential, pH, temperature, pulp density, acid pretreatment and SO 2 addition have been investigated. Maximum gold and silver extractions are respectively 95.5% and 85.4%.

Extraction of gold from typical Carlin gold concentrate by ...

Based on this, given the difficulties in gold extraction and pollution issues in cyanide extraction of typical Carlin-type gold concentrate, a new method of pressure oxidation‑sodium jarosite decomposing-non-cyanide gold extraction from typical Carlin-type gold concentrate is innovatively put forward for the first time.

Extraction of gold from typical Carlin gold concentrate by ...

In view of the difficulties in gold extraction and serious pollution incidents of typical Carlin type gold concentrate, this paper proposes pressurized oxidation - sodium jarosite decomposition - polysulfide leaching method to recover gold from typical Carlin type gold concentrate.

Gold Leaching from a Refractory Gold Concentrate by the ...

In this research, NaCl — NaClO solution is used to leaching gold from a refractory gold concentrate, and the influence of NaCl and NaClO concentration, reaction time to the leaching rate were investigated in this experiment. The raw materials and the leaching residue were characterized by a series of analysis methods such as XRD, XRF, SEM and ...

Dissolution kinetics of tellurium from gold concentrate ...

gold concentrate during alkaline sulphide leaching W. Yang1,2, H. Cao1,2, Y.P. Wang3, T. Long1,2, H. Wan1,2, H. Li1,2, and P. Dong1,2 Synopsis Alkaline sulphide leaching was adopted to extract tellurium from tellurium-bearing gold concentrate for the first time. The tellurium leaching kinetics were studied. The influence of average particle size,

The leaching and adsorption behaviour of gold ores

concentrate showed an enhancement in gold extraction due to the activated carbon adsorbing gold that would otherwise have been preg-robbed. However, this mechanism did not explain the behaviour of the pyrite concentrate. For this ore the enhanced extraction was due to a combination of equilibrium and preg-robbing effects.

Extraction of Gold from Refractory Gold Concentrate by ...

Extraction of Gold from Refractory Gold Concentrate by Roasting-Cyanide Leaching WU Zhi 1,HUANG Zhongsheng 1,ZANG Hong 1,ZHONG Shuiping 1,2,WU Zengling 1,2 1.State Key Laboratory of Comprehensive Utilization of Low-Grade Refractory Gold Ores,Zijin Mining Group Co.,Ltd.,Shanghang 364200,Fujian,China；

Refractory Gold Ore Treatment Methods

Gold Extraction from Carbonaceous Ore. The so-called "graphite" or carbonaceous mineral that exists in certain ores in California, Montana, West Africa, and western Australia has been a source of considerable difficulty in …

Extracting Tungsten from Wolframite Gold Ore

Beneficiation of Microsize Wolframite by Flocculation and Gravity Separation. Materials, Wolframite was obtained from Jiangxi, physically purified and ground in porcelain mill, getting -10 µm microsize by a sedimentation.The …

Gold Flotation - Mineral Processing & Metallurgy

A gold carbonaceous sulphide ore from California carrying free gold yielded a 93 per cent recovery into a concentrate at 14.4:1 to ratio of concentration after conditioning with 0.50 lb. per ton of reagent 645. In each case the ore was …

Environmentally friendly extraction of gold from ...

Specifically, the gold concentrate was roasted for 3 h at 600 °C, and the roasted residue was leached by conventional cyanidation under the conditions described in section 3.1.1 to achieve a gold extraction efficiency of 74.3%. Comparison with the above results shows that roasting is an effective pretreatment method for S- and As-rich ...

Minerals | Free Full-Text | Improvement of Gold Leaching ...

A total gold extraction of 70.2% could only be reached via direct cyanidation from a refractory As-, S- and C-bearing gold concentrate calcine, and the gold extraction varied noticeably with different size fractions. The reasons for unsatisfactory gold extraction from the calcine were studied through analyses of chemical composition, chemical phase and SEM …

(PDF) Ultrasound-assisted cyanide extraction of gold from ...

At the low temperature of 10 °C, ultrasound-assisted extraction increased extraction rate of gold by 0.6%-0.8% and reduced the gold content of cyanide tailings to 0.28 g/t in the leaching of gold ...

Gold recovery from refractory gold concentrates by ...

and could improve gold extraction of flotation concentrate treated by oxidative roasting (Xu et al., 2015). Pressure oxidation technology for the treatment of refractory gold concentrates has been deployed in some countries. Shuiyindong gold deposit is one of the Carlin-type deposits which is a typical