Pyrrhotite is one of the most abundant sulphide minerals and in flotation processes is frequently rejected to tailings. This is often the case when massive nickel …
The flotation rate of pyrrhotite is relatively slow when sodium carbonate is used so the rejection of pyrrhotite is enhanced in com- parison with a flotation system that uses lime as the base. Shebandowan also uses sodium carbonate as the base but also recycles most of the water used in the concentrator.
The influence of conditioning on the flotation of pyrrhotite in the presence of chlorite was investigated through flotation tests, sedimentation tests, and X-ray photoelectron spectroscopy (XPS ...
In industrial manufacturing, pyrrhotite (Fe 1−x S), once depressed, is commonly activated for flotation. However, the replacement of CuSO 4 is necessary due …
The pyrrhotite flotation recovery was different under varied pH, when slurry pH value increased from 3.15 to 9.21, the recovery of pyrrhotite increased gradually; and when slurry pH value continued to rise to 11.09, the recovery of pyrrhotite decreased slowly. (2). It can be seen from the effect of particle size on pyrrhotite flotation recovery ...
The collectorless flotation selectivity index in the case of stockpile samples (2.58) is much higher than the case corresponding to the collector induced flotation with an average selectivity index of 0.65. The low value in the latter case is attributable to the excessive flotation of pyrrhotite due to its metal activated state.
During the process of Zn-S selective flotation, although lime may be not an effective pyrite/pyrrhotite depressants alone and the synergistic depression effect of lime combined with other depressants has been confirmed and reported [17], [42], [49], it still relies more on lime to depress pyrite/pyrrhotite flotation in the exprimental study on ...
1. Introduction. Pyrrhotite predominates among iron sulfides in a number of copper–gold sulfide deposits, and its recovery during the flotation process reduces product quality and causes environmental problems such as iron oxide slag generation and sulfur oxide emissions in the downstream smelting process (Allison and O'Connor, 2011).However, …
This study applied an alkaline glycine-based leaching method to selectively recover Ni and Co from a pyrrhotite-rich flotation slime and investigated the deportment of impurities. Leaching variables, including dissolved oxygen (DO) level (5–25 ppm), pH modifier (NaOH, KOH and ammonia), particle size and pre-oxidation, were investigated. ...
Flotation is one of the most important technologies to recover sulfide minerals [5], [6]. In commercial flotation production, pyrrhotite is an important sulfide gangue for pyrrhotite-rich type copper sulfide ore, and it can pose significant negative impact on the enrichment of chalcopyrite [7].
Flotation results confirmed that pulp aeration was able to selectively depress pyrrhotite and pyrite flotation under ML8 system, thus 3000 g/t lime was cancelled during copper flotation stage, and ...
In pentlandite-pyrrhotite flotation separation with the presence of polyamines, for example, diethylenetriamine (DETA) and triethylenetetramine (TETA), xanthate adsorption on pyrrhotite is reduced, and thus the pyrrhotite is depressed.
The same flotation kinetic models are used to simulate the flotation dynamic process of pyrrhotite after pre-stirring and unpre-stirring, and the results show that the pyrrhotite flotation rate of the former is larger than that of the latter and the time to reach equilibrium for the pre-stirred flotation is shorter than that for the unpre ...
Ideal flotation conditions were determined to remove potential acid-generating minerals (mainly pyrrhotite) while also recovering residual valuable minerals, …
Regarding the roughing process of limed-depressed pyrite/pyrrhotite flotation, the desired amounts of oxalic acid (H 2 C 2 O 4) was first added to the flotation cell, activating flotation for 5 min; then the roughing flotation lasted for 4 min, after BX and terpineol acted for 2 min and 1 min, respectively. Both froth concentrates and flotation ...
Sphalerite flotation is conducted under Cu 2+ activation system, whereas the selective separation of pyrrhotite is difficult due to the inevitable activation effect of Cu 2+, which requires a large amount of lime to depress pyrrhotite flotation.In this study, the conventional collector butyl xanthate and a novel collector ML8 were compared to the …
In this paper, the importance of electrochemistry in Po and Pn flotation has been demonstrated and a comprehensive study was conducted on two different feed …
The products from pyrrhotite oxidation cover the pyrrhotite particles, rendering the particle surface hydrophilic and causing a lower flotation recovery of pyrrhotite under most circumstances. Under low oxidation …
Pyrrhotite (Po) is one of the most abundant sulfide minerals in processing industry and must be rejected in most cases. Particularly, Po rejection and its selectivity against pentlandite (Pn) have long been a challenge due to similarities in the mineral composition of the two minerals and the collectorless flotation characteristics of Po. …
During flotation, the pyrrhotite is commonly rejected to the tailings as a waste product, and hence in massive sulfide ores treatment, the process often aims to depress the pyrrhotite flotation [6 ...
At pH 5, the optimal potential range for flotation of monoclinic pyrrhotite is about 125−580 mV (vs SHE), with the maximum flotation occurring at about 350 mV (vs SHE); the …
Abstract: The galvanic interaction between chalcopyrite and monoclinic pyrrhotite and its effect on flotation separation were studied using monomineral flotation tests, adsorption …
A copper–gold ore sample containing particles with a P 80 of 7 mm was supplied from a copper–gold flotation plant in Western Australia. This ore sample contains pyrrhotite grains with sizes ranging from 150 to 500 μm. Table 1 lists the elemental composition of the ore as determined by inductively coupled plasma atomic emission …
In some cases a low flotation recovery of PGM may be due to the surface state of pyrrhotite particles under conventional flotation conditions (open to air and pH 9.0).Thermodynamically pyrrhotite ...
However, removing as much pyrrhotite as possible in flotation stage using effective pyrrhotite depressants is still a preferred choice for producers because of its low operation cost. Nevertheless, the use of a strong depressant typically entails high pentlandite losses. So looking for a new and better pyrrhotite depressant may be critical
The chemistry of pyrrhotite flotation using xanthate collectors is reviewed with respect to the processing of PGM ores and the recent results from captive bubble contact angle measurements at the University of Utah are presented. In some cases a low flotation recovery of PGM may be due to the surface state of pyrrhotite particles under ...
The galvanic interaction between chalcopyrite and monoclinic pyrrhotite and its effect on flotation separation were studied using monomineral flotation tests, adsorption capacity tests, X-ray photoelectron spectroscopy (XPS) characterization, and scanning electron microscopy (SEM) test. These results showed that the interaction …
In industrial manufacturing, pyrrhotite(Fe1−xS), once depressed, is commonly activated for flotation. However, the replacement of CuSO4 is necessary due to the need for exact control over the ...
The flotation process normally adds copper sulfate as an activator which could accelerate the flotation rate of pyrrhotite. The flotation is conducted at the natural pH of the milled ore which may vary …
pyrrhotite flotation can be achieved at pH<5 [4]. It was reported [5] that hexagonal pyrrhotite is more reactive than monoclinic pyrrhotite, and VANYUKOV and RAZUMOVSKAYA [6] noted that oxidation rates tend to increase with an increase in the sulfur to iron ratio in pyrrhotite. In this work, the floatability of different
The impact of sulfuric acid pretreatment on the surface property of oxidized pyrrhotite (OX-pyrrhotite) and its application in flotation desulphurization of magnetite concentrate were investigated in this study. OX-pyrrhotite using sodium butyl xanthate (BX) collector performed a poor floatability. After sulfuric acid pretreatment, OX ...