Sulfide Flotation
In the case of mesothermal pyritic gold ores, pyrite and arsenopyrite are sufficiently coarse grained, which allows for good liberation at modest grind fineness (P 80 of 75–120 μm) and results in high-grade concentrates with good recoveries. In some of these ores, submicroscopic gold is exclusively carried by arsenopyrite, which makes separation …
The flotation of gold bearing ores — A review
Abstract. The practice of the flotation of pure gold and gold-bearing ores such as tellurides, aurostibite, kerogen, pyrite, pyrrhotite, copper-gold ores and mixed sulphides is reviewed. The factors which influence the choice of collectors, pH and Eh, are discussed as well as the application of differential flotation.
Minerals | Free Full-Text | Gold Extraction from a …
Many gold deposits contain finely disseminated gold particles in iron sulfide minerals such as pyrite. These minerals are called refractory gold ores because of the presence of gold, which occurs …
Selective flotation of chalcopyrite from pyrite using
The micro-flotation findings indicated that AATT was a favorable collector for flotation enrichment of chalcopyrite and galena at pH <11.0, and realized an efficient flotation separation of ...
Nitric acid treatment of a pyrite rougher concentrate to oxidise
If a concentration step such as flotation could separate one specific type of pyrite from other pyrite types in a concentrate prior to the autoclave process (Mason, 1992, John et al., 2013, Lamb, 2004, Wightman, 2005), then the Au:S values of the autoclave feed can be upgraded and more gold can be produced for a given autoclave sulphide sulphur ...
Selective flotation of gold from pyrite under oxidizing conditions
Bench-scale flotation tests confirmed the feasibility of selective separation of gold from pyrite by using hydrogen peroxide as an oxidizing agent and amyl xanthate …
Effects of Fine Minerals on Pulp Rheology and the …
In this study, the effects of four fine minerals, which were fine diaspore (FDIA), kaolinite, illite, and pyrophyllite (D50 is about 4.55 μm, D80 is about 10.78 μm), on the pulp rheology of the diaspore and pyrite …
A case study of the separation of copper-gold sulfide ore from pyrite
Due to many problems such as pipe blockage, environmental pollution, and the difficulty of recovering precious metals, caused by extensive use of lime, the conventional program using lime (CaO) as the inhibitor and xanthates (e. g., sodium butylxanthate) (BX) as the collector has become increasingly restricted in use, and lime-free flotation …
Flotation of Gold and Gold-Bearing Ores
Flotation preconcentration of gold-bearing sulfides (pyrite and arsenian pyrite) from many Carlin-type refractory gold deposits are challenging, with low recovery …
Polysaccharides-based pyrite depressants for green flotation separation
In froth flotation separation, the first use of polysaccharides dates back to 1928 and has continued up to now [34].Although several polysaccharides have been recently synthesized and extensively used for pyrite depression in different mineral processing plants, no comprehensive review article has universally explored their …
Froth Flotation of Chalcopyrite/Pyrite Ore: A Critical Review
Chalcopyrite and pyrite show recovery of over 90% when working with SBX and MIBC at pH 4–10. An increase in pH to 11.5 allowed lowering the pyrite recovery to 63%. However, when using PCA, pyrite flotation was significantly reduced at pH 4–8, while chalcopyrite was slightly affected, with recoveries over 90%.
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1 also for beneficiation and separation of difficult-to-treat (refractory) gold ores. Flotation is also the best method for recovery of gold from base metal ores and gold-containing …
The separation of chalcopyrite and chalcocite from pyrite in …
The four flotation concentrates were combined and reground in a rod mill with stainless steel grinding media. The total weight of grinding media was about 10.3 kg.Particle size P 80 = 20 μm was achieved by adjusting the grinding time. The size distribution was determined by Laser Diffraction with a Malvern MasterSizer (Malvern Instrument Ltd., …
Flotation behavior of native gold and gold-bearing sulfide …
In this study, the flotation behaviors of gold and gold-associated sulfide minerals (pyrite and sphalerite) in a polymetallic sulfide gold ore were investigated using …
Recovery of valuable elements from pyrite pyrolysis
The impurities in the pyrolysis slag are removed by magnetic separation-flotation. • Pb and Zn in pyrolysis slag decreased from 0.78% and 0.36% to 0.14% and …
Mineralogical Factors Affecting the Dense Medium Separation of …
Dense medium separation (DMS) is widely used for the upgrading of coal, iron ore, diamonds and industrial minerals. This technique has also been used in the base metals industry for the preconcentration of ores before their main processing stage, e.g., the Camrose DMS 2 Project and the Chemaf DMS plant at Etoile, for copper upgrading in …
Activation mechanism of ammonium oxalate with pyrite in the
The activation properties of ammonium oxalate on the flotation of pyrite and arsenopyrite in the lime system were studied in this work. Single mineral flotation tests showed that the ammonium oxalate strongly activated pyrite in high alkalinity and high Ca2+ system, whereas arsenopyrite was almost unaffected. In mineral mixtures tests, …
Beneficiation of Gold and Silver Ores | SpringerLink
Coarse particle flotation; Magnetic separation; ... During the late 1960s flotation of pyrite was a key focus in many South African gold operations to meet the needs of sulfuric acid market from the booming uranium industry. The gold boom in the 1980s and 1990s led to the processing of several refractory gold and copper-gold …
Professor Yongjun Peng
Based on a pyrite-gold ore, this technology achieved a gold recovery up to 10% higher than the base line. This technology is commercialized by Kinetic Group Worldwide. ... Flotation separation of copper sulphides from arsenic minerals at Rosebery copper concentrator. Minerals Engineering, 66, 207-214. doi: 10.1016/j.mineng.2014.04.003.
Analysis of the Selective Flotation of Elemental Gold …
To improve the fundamental understanding of surface chemistry in the flotation of elemental gold from sulfide minerals using thiophosphate collectors, density functional theory and molecular …
Gold Ore Roasting Techniques
Recover Gold by Roasting Pyrite Ore. ... and cyanidation of the calcine in a separate circuit. The following notes are taken from J. E. Williamson's paper "Roasting and Flotation Practice in the Lake Shore Mines Sulphide Treatment Plant," C.I.M. and M. ... The flotation concentrate is thickened, filtered to 16 per cent moisture, and ...
Ask The Experts
A: It's true that pyrite from gold mines will contain a small amount of gold. It is microscopic and is found inside the pyrite crystal. Miners who process gold ores will get free gold particles that can be melted into bars, but they also recover pyrite that has small amounts of gold within it. Often the majority of the gold is in the free ...
The mechanisms of pyrite oxidation and leaching: A fundamental
Pyrite is the earth's most abundant sulfide mineral.Its frequent undesirable association with minerals of economic value such as sphalerite, chalcopyrite and galena, and precious metals such as gold necessitates costly separation processes such as leaching and flotation.Additionally pyrite oxidation is a major contributor to the …
How to Separate Gold from Pyrite
These particles may be separated from the oxides of iron by washing, and the use of nitric acid, followed by panning, is frequently resorted to in order to detect gold in pyrites. Moreover, although usually invisible, gold can sometimes be seen in unroasted …
A Brief Review of Auriferous Sulphide Flotation …
Notwithstanding, in the separation of gold bearing sulphides during froth flotation, a concentrate made up of both pyrite and arsenopyrite is obtained due to their similar characteristics...
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 …
Optimisation of gold recovery by selective gold flotation for copper
Gold flotation is often overlooked as a processing option as the precious metal is viewed as being associated with the sulphide particles present in the ore, even …
A Brief Review of Auriferous Sulphide Flotation …
Notwithstanding, in the separation of gold bearing sulphides during froth flotation, a concentrate made up of both pyrite and arsenopyrite is obtained due to their similar characteristics and ...
Selective flotation of gold from pyrite under oxidizing conditions
Gold and pyrite separation by flotation could possibly be achieved in this system due to the significant differences in hydropho- bicity found between gold and pyrite (Figs. 4 and 5). Fig. 6 shows the results of measurements of the electrophoretic mobility of pyrite as a function of pH for different conditions of superficial oxidation, in the ...
Using Kerosene as an Auxiliary Collector to Recover Gold from
Carbon–arsenic-bearing gold ore is a typical complex refractory gold resource. Traditionally, xanthate was often used as a flotation agent to separate gold minerals. But, in this paper, in order to reduce the cost of the agent, kerosene was used as an auxiliary collector, and the gold grade and recovery rate were increased by about 10 …