For example, chalcopyrite can be selectively floated from iron sulphides (pyrite, pyrrhotite) in a highly alkaline environment (pH > 11.5), while at lower pH values pyrite readily adsorbs collectors and reports to the flotation concentrate (Wang and Forssberg, 1991).
In the flotation separation of galena-pyrite mixed concentrate, large amounts of lime (CaO) are used for the depression of pyrite. In this study, the negative effects of lime were reduced by using an efficient depressant Na 2 SO 3 + CaO reagent in the flotation separation of galena from pyrite.
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 …
Thus, pyrite flotation is possible in more reducing conditions, those achieved by the action of sulphoxy salts; arsenopyrite, however, was found to be seriously depressed. ... Matis K.A., Kydros K.A. & Gallios G.P., Processing of bulk pyrite concentrate by flotation reagents, Minerals Eng., 5 (3-5), 331 (1992). Beyzani A.N. & …
Metallurgical results confirmed that it is possible to upgrade the Au:S values of a pyrite flotation concentrate by using a hydrometallurgical scheme for preparation before flotation. A 144% increase in Au:S value was obtained with 25% oxidation of the pyrite concentrate with a gold recovery of 56%.
Figure 2b represents chalcopyrite flotation against pyrite. As the pyrite feed grade increased from 5% to 25%, chalcopyrite flotation against pyrite was improved …
The industrial concentrate, used in this work, is an auriferous bulk pyrite- arsenopyrite flotation concentrate which is considered as a problematic "waste", due to its arsenic content. A positive relationship exists between the arsenic and gold contents of this product (Matis et al., 1992 ). The objective of this study was to float selectively ...
The use of pyrite depressants is one way to remove pyrite from flotation concentrate (Ahmed Khoso et al., 2019, ... As can be seen, the grade of Cu in flotation concentrate was effectively improved from 9.15% Cu to 22.0% ± 0.88% Cu by adding tricarboxystarch to mineral suspensions in the pH range 2–7. Under these conditions, …
Pyrite single mineral was used to simulate pyrite rougher flotation concentrate obtained at Telfer flotation plant which contains about 80% pyrite. Pyrite mineral was purchased from GEO Discoveries, Sydney and originated from Peru. The XRD spectrum of the pyrite sample is shown in Fig. 1. All of the peaks appeared in the …
The demand for sulfuric acid initiated by the booming uranium industry during the late 1960s provided the catalyst for the installation of pyrite flotation plants on numerous gold mines in South Africa (Bushell, 1970; Broekman et al., 1987).After roasting the pyrite flotation concentrate to generate sulfur dioxide for the sulfuric acid plant, the …
Gold grains are observed in a variety of forms, such as coarse-liberated native gold grains, and ultra-fine grains associated with sulfide or non-sulfide mineral particles, in the form of solid solution in sulfide minerals, mainly pyrite. In the flotation of gold ores, bulk sulfide mineral flotation is generally applied to maximize gold recovery. …
Pyrite is separated from other minerals mainly by flotation. However, the hydrophilicity of pyrite is affected by many factors, causing it to easily enter the concentrate and consequently reduce the quality of concentrate. Highly efficient pyrite depressants can be selectively adsorbed on the surface of pyrite to improve its hydrophilicity, thereby …
Pyrite is separated from other minerals mainly by flotation. However, the hydrophilicity of pyrite is affected by many factors, causing it to easily enter the …
The recovery of cobalt and base metals (Cu, Zn) from a cobaltiferrous pyrite flotation concentrate that contains 6407 g/t Co, 3548 g/t Cu and 1705 g/t Zn by leaching in H 2 SO 4-NaNO 3 solutions were demonstrated. Statistical design of experiments (i.e., response surface methodology) ...
As a gangue mineral, pyrite often enters a lead concentrate in the process of flotation separation, resulting in the low grade of lead concentrate and the high cost of smelting [8], [9]. ... Lignosulfonate calcium could selectively depress pyrite flotation around pH 9.
The new process of activation flotation pyrite with CO 2 has prospects for large-scale application in terms of activation performance, cost-effectiveness and environmental impact. ... [EX] = 32 mg/L, and the volume ratio of AMD to pure water = 1:1). A high-grade concentrate with 77.35 % Cu recovery and 29.01 % Cu grade was …
The above studies explored the mechanism of coal–pyrite entering flotation concentrate from four perspectives—the hydrophobicity of the coal–pyrite surface, symbiosis with coal, entrainment, and surface oxidation. However, it has not been reported how the completely dissociated fine-grained coal–pyrite captures hydrophobic …
The tailings go to the hydrocyclone, where the pyrite in the underflow is separated by flotation or gravimetry. The concentrate thus obtained (called "acid …
SEM/BSD photomicrograph of an arsenian pyrite grain in the flotation concentrate. Concentrate obtained after 1 and 15 mins, from the flotation experiment using 1.2 kg/t IPETC and 0.3 kg/t CuSO 4 at pH 11, were screened at 75 μm and subjected to MLA. The purpose of conducting the MLA was to determine if the variation in the …
To obtain the liberation degree of copper bearing minerals in the flotation concentrate, the line scanning method for point counting was used. The total length of free valuable particles was divided by the total length of free and locked particles containing copper minerals. ... Indeed, pyrite flotation can be reduced when its surface is ...
XPS spectra for concentrate and tails samples of pyrite-rich Mount Isa copper ores (Grano, 1990) showing the presence of carbon in the pyrite (Binding Energy (eV), g-graphitic, c-carbonate). Test carried out under nitrogen purge conditioning at pH 8, in the absence of collector. ... Pyrite flotation recovery as a function of solution potential ...
The conventional flotation circuit utilises both forced air and self-aspirated cells and employs two stages of cleaning. This is broadly depicted in the flow sheet of Fig. 2.The combined re-cleaner concentrate is directed to final concentrate, whilst the 'Scavenger 8 Tail' is the final tails from the flotation circuit, which is directed to the …
Due to locked gold in pyrite particles and a high concentration of copper, gold recovery from the leaching of pyrite flotation concentrate is well below the industry standard of gold leaching with more than 90% gold recovery (Zheng et al., 2010, Burns et al., 2012). It has been proposed that an additional circuit consisting of regrinding the ...
Flotation concentrates are an important resource for cobalt and base metals (Cu & Zn). NaNO 3 is an effective oxidant for pyritic flotation concentrate in H 2 SO 4 media.. NaNO 3 and temperature are the most significant factors affecting Co extraction.. Ultra-fine grinding improves the kinetics of metal extraction. • Cobalt extraction relies …
A mobile flotation facility, based on two 5 L minicells equipped with on-line monitoring of pH, dissolved oxygen and pulp potential, was used to study flotation of pyrite from zinc concentrate (i.e. reverse flotation) at the Trout Lake circuit of Hudson Bay Mining and Smelting Co. Ltd., Flin Flon, Manitoba.
Tailings that are generated in the copper concentrate production contain great amount of sulfide mineral, in particular pyrite. Pyrite in contact with water and oxygen might oxidize spontaneously ...
A copper-pyrite mill in Canada uses the 12-cell No. 21 "Sub-A" Flotation Machine, shown above, for roughing, and a 2-cell No. 21 "Sub-A" Flotation Machine for cleaning to produce a fairly coarse pyrite …
The depression of pyrite flotation by polysaccharides is due to the selective adsorption of polysaccharides polymers on pyrite surface. Bulut et al. (2011) investigated the depression effect of starch on pyrite flotation and found that starch was effective at a low dosage (1.7 mg L −1) and more pronounced at alkaline pH (10) than natural pH ...
The flotation recovery was more than 80 % when the concentrate of collector was over 30 mg/L. The recovery of sphalerite was less than 40 % at the stated collector concentration. In addition, the recovery of pyrite was less than sphalerite at the concentrate from 20 to 40 mg/L.
Its presence in the flotation concentrate is not entirely desirable since it lowers the grade ofthe final copper concentrate. Lime depression of the pyrite has been practiced with some ... pyrite flotation in the pH range of1 to 12, Fuerstenau etal. (1968) obtained two recovery peaks at pH values of 4 and 9. Also, in the flotation ofpyrite by ...
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