② Gold is often dense associated with sulfide minerals especially with pyritetherefore the sulfide minerals must be selected at the same time in the recovery of gold. ③ The relative density of gold is very large. In the process of flotation the gold particles are easy to fall off from the bubble surface after contact with the bubbles.
Valueless slime in addition to its detrimental effect in coating gold-bearing sulphide thereby limiting or preventing its flotation also becomes mixed with the flotation concentrate and lowers its value. Sometimes the problem in flotation is that although the gold is floatable the concentrate product is of too low grade.
Request PDF | On Jan 27 2015 Eric A. Agorhom and others published Corrigendum to “Influence of gold mineralogy on its flotation recovery in a porphyry copper–gold ore” [Chem. Eng. Sci. 99 .
The presence of clay minerals in ores has been known to adversely affect the flotation performance. This work investigated the influence of kaolin and bentonite clays on the flotation of gold-bearing pyrite in the gold ore.
and non-sulfide minerals including coal in which it is considered a gangue mineral and thus rejected as tailings in flotation practices. Its flotation behavior is very important for determining the quality of concentrates of many different types of ores containing gold copper lead and zinc and coal [3-5].
2.2 Inhibiting the flotation of iron sulfide minerals. When flotation of various non-ferrous metal sulfide minerals (such as copper lead zinc etc.) with xanthate collectors the ore usually contains a certain amount of iron sulfide minerals such as pyrite marcasite pyrrhotite arsenopyrite etc. inhibiting iron sulfide minerals with lime .
Usually gold is concentrated in its ores using gravity flotation or cyanidation techniques while refining is carried out by electrolysis [2 3]. Although the flotation technique is widely applied for the gold enrichment in the gold-bearing mineral ores there is no enough research for the flotation of gold-bearing ores.
Understanding the mineralogy and associations of gold in the flotation feed is crucial to optimise operations. Changes in ore mineralogical composition influence mineral/metal recovery reagent choice and also help in identifying and explaining possible processing challenges.
The present study investigates the implications of gold mineralogy on its flotation recovery in a typical porphyry copper–gold ore (1.7 g/t Au feed grade). Also flotation strategies to optimise.
“Ammo-phos” a crude monoammonium phosphate is sometimes used in the flotation of oxidized gold ores. It has the effect of flocculating iron oxide slime thus improving the grade of concentrate. Sodium silicate a dispersing agent is also useful for overcoming gangue-slime interference.
During comminution there is a generation of abraded iron surfaces from grinding media and the broken particles can be deposited on gold surface changing gold particles characteristics and its behavior during recovery processes such as flotation and leaching. In this way gold particles are smeared and its natural properties are affected.
The aim of this study is to apply process mineralogy as a practical tool for further understanding and predicting the flotation kinetics of the copper sulfide minerals. The minerals’ composition and association grain distribution and liberation within the ore samples were analyzed in the feed concentrate and the tailings of the flotation processes with two pulp densities of 25wt% and .
Flotation is a method of separating an ore species froth another based on its hydrophobic surface characteristics either natural or induced when present as a suspension in water with air bubble. Due to the affinity of the desired mineral to adhere to air bubbles it is floated out of the ore slurry. Schematics of various sub processes controlling
The present study investigates the effect of regrinding and aeration on the separation of pyrite from gold in copper rougher flotation tailings (0.07% Cu 0.61g/t Au tail grades). An aeration stage was applied both at the head of copper flotation (copper rougher feed) and after regrinding of the copper rougher tailings before gold/pyrite selective flotation. Also different collector regimes .
Step-flotation [57 – 58] and dispersion flotation technologies have been proposed to reduce the influence of carbonate minerals on iron ore flotation. These technologies help eliminate the typical interactive effect among minerals in carbonate-bearing iron ores.
Agorhom EA Skinner W & Zanin M 2013 'Influence of gold mineralogy on its flotation recovery in a porphyry copper-gold ore' Chemical Engineering Science vol. 99 pp. 127-138. 14 9 2013
Cyanide has been widely used as a depressant in sulphide mineral flotation. It occasionally activates mineral flotation as well. In addition cyanide species in the water from gold cyanidation process may be recycled to flotation circuits and have an inadvertent effect on mineral flotation.
The technological mineralogy of a gold deposit located in North-Western province of Zambia was carried out by using X-ray fluorescence spectroscopy (XRF) X-ray diffraction spectroscopy (XRD) and scanning electron microscope (SEM). The results showed that gold was highly dispersed in gold-bearing minerals such as pyrite arsenopyrite and some gangues in the form of natural gold and electrum .
If two minerals existed in one particle less than 95% of abundance it was termed a binary particle. INFLUENCE OF PROCESS MINERALOGY ON IMPROVING METALLURGY 35Modal analysis showing locking statements of copper minerals with pyrite and gangue were also carried out for all fractions considering their quantity in whole stream.
And the dosage is generally 2-150g/t during gold flotation the disadvantage is that it is toxic and flammable. 3. Inhibitors (1) Working principle. As one type of gold flotation reagents inhibitor can reduce the floatability of minerals. Its function is to selectively interact with minerals to cause hydrophilicity on the surface of minerals.
The mineral is then separated and flows over the overflow into a trough called a flotation cell LAUNDERER. The OVERFLOW is now called the flotation CONCENTRATE of the circuit. The mineral has been separated from the ore there for it is in a concentrated form from the original. The UNDERFLOW is the pulp.
If the froth machine contains much ore slurry it will bring a series of adverse effects on flotation cells mineral processing. The main influences are as follows 1 Easy to be mixed in the foam product so that the concentrate grade is reduced. 2 Easy to cover the coarse grain surface affecting the flotation of coarse particles.
The results obtained from this study showed that the type of clay and its concentration affected the flotation of the gold ore in which pyrite was the carrier mineral. More precisely the presence of bentonite in the ore reduced the pyrite recovery and modified the pulp rheology significantly more than kaolin.
Flotation performance of gold-bearing pyrite in refractory gold ores depend upon the interplay among process water chemistry grinding chemistry and ore mineralogy. The nature of pyrite itself (finely disseminated reactive .
The influence of ore mineralogy and operating conditions on gold flotation response is discussed. Flotation circuits in commercial gold concentrators are described along with modern plant practice for various ore types including refractory gold arsenopyrite pyrrhotite pyrite telluride and copper–gold ores.