pyrrhotite was set by galvanic interaction with steels and active metals, or applied from an external power source. To investigate if the application of potential would alleviate …
The effect of galvanic interactions among sulfide minerals such as chalcopyrite, galena, and sphalerite in the presence and absence of a grinding ball material on the flotation recovery of chalcopyrite has been studied. X-ray photoelectron spectroscopy (ESCA) studies were carried out to identify the reaction products on the sulfide minerals after different types of …
The objectives of this research are: (i) to quantify the galvanic interactions between grinding media and arsenopyrite based on their electrochemical characterization during grinding (Part I), (ii) to control the surface …
For pyrrhotite, the results showed that when the grinding of the ore was performed using the ceramic media or the 30% chromium media, the gold extraction process was up to three times more ...
Grinding in steel mills adversely affects the flotation of pyrrhotite. Rest potential and galvanic current measurements were made to study the electrochemical interactions between pyrrhotite and several metal electrodes including mild steel, austenitic and martensitic stainless steels, zinc and magnesium. Adverse effect on its floatability …
There has been an intensifying effort to identify, explain and exploit the effects of grinding media on flotation chemistry during the 80's. This paper summarizes progress made to date in evaluating the chemical effects of grinding media types. It addresses media effects on the chemistry of flotation of each of the more common sulphide …
The open circuit potential of the grinding media (i.e. forged steel or 30% chromium grinding media) and pyrrhotite electrodes were measured in situ in the mill. …
Grinding with steel media adversely affects the flotation response of galena. Electrochemical measurements, flotation tests, and examinations were employed to identify interactions between galena and mild steel. Iron oxide, hydroxide, or sulfate species that formed on the galena surface upon contact with mild steel decreased its floatability, with …
Pyrrhotite-grinding media interaction and its effect on flotability at different applied potentials. Miner. Metall. Process. (1984) ... Electrochemically active grinding media, such as mild steel, produces a great amount of iron oxidation species which contaminate mineral surfaces and depress mineral flotation.
The electrochemical nature of pyrrhotite-grinding media interaction was investigated by using an experimental setup in which an electrode was rotated against a …
Different grinding media had significant effects on slurry chemical properties and flotation performance. Mild steel rods (RMMS) produced the highest solids recovery, nickel and pyrrhotite (Po) recovery, with the highest ethylenediaminetetraacetic acid (EDTA) extractable iron and the lowest DO level.
During wet grinding the electrochemical interactions between grinding media and pyrrhotite not only acelerate media wear but also adversely affect the …
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Abstract The electrochemical nature of pyrrhotite-grinding media interaction was investigated by using an experimental setup in which an electrode was rotated …
A series of batch flotation tests was performed on chalcopyrite-quartzite, on pyrrhotite-quartzite and on chahcopyrite-pyrrhotite-quartzite mixtures. Pulp potential measurements in the flotation tests with single sulfide minerals indicated that each sulfide mineral had its own optimal potential range for flotation. When these results were used to select the …
Pyrrhotite-grinding media. The contact of pyrrhotite with mild steel was found to have a detrimental effect on its floatability (Adam et al., 1984). The reduced floatability was attributed to formation of an iron hydroxide coating on pyrrhotite, which is not only hydrophilic but also hinders xanthate adsorption. The iron hydroxide was …
Pyrrhotite-grinding media interaction and its effect on floatability at different applied potentials. Miner. Metall. Process. (1984) ... Sulphide mineral processing often involves grinding media and a number of types of sulphide minerals at various ratios of feed grades, but conventional studies on galvanic interactions for sulphide mineral ...
The electrochemical nature of mineral-grinding media interaction in the wet grinding of one and two sulfide mineral ores was investigated with regard to the flotation behaviors of the minerals. Two iron sulfides (pyrite and pyrrhotite) and mild steel were used to represent the sulfide minerals and the grinding media, respectively. Galvanic currents in two- and …
Abstract The electrochemical nature of pyrrhotite-grinding media interaction was investigated by using an experimental setup in which an electrode was rotated against a porcelain ball immersed in a … Expand. 18. Save. Effect of electrochemical interactions among sulfide minerals and grinding medium on chalcopyrite flotation.
For pyrrhotite, the results showed that when the grinding of the ore was performed using the ceramic media or the 30% chromium media, the gold extraction process was up to three times more ...
From a review of the literature, there are such other factors influencing pyrrhotite floatability, including: Pyrrhotite-grinding media: the contact of pyrrhotite with mild steel when being ground was found to have a deleterious effect on its floatability (Admas et al., 1984). The reduced floatability was attributed to the 860 J.D. Miller et al ...
In this paper, pyrrhotite was selected because this sulfide mineral is the highest cyanide- and oxygen-consuming iron sulfide mineral. With regards to grinding media type, the following grinding media were used: the forged steel, 21% chromium, 30% chromium and ceramic media.
The corrosion of grinding media releases iron into solution and at alkaline pH values iron hydroxyl species are formed (Bradshaw et al., 2006). In the experiments of open circuit potential measurement it was observed that pH reduction increases potential difference between the minerals and also between mineral and steel.
Under the various conditions, a pyrrhotite particle may act as an anode or cathode, which may lead to hydrophobic or hydrophilic surface states. From a review of the literature, there are such other factors influencing pyrrhotite floatability, including: Pyrrhotite-grinding media: the contact of pyrrhotite with mild . Pyrrhotite characteristics
Grinding in steel mills adversely affects the flotation of pyrrhotite. Rest potential and galvanic current measurements were made to study the electrochemical interactions between pyrrhotite and several metal electrodes including mild steel, austenitic and martensitic stainless steels, zinc and magnesium. ... Grinding media were …
During wet grinding the electrochemical interactions between grinding media and pyrrhotite not only acelerate media wear but also adversely affect the sulfide minerals flotation response. A possible remedy of the adverse effects on floatability by applying electric potentials to grinding media was examined. Flotation tests, Auger electron …
The effect of grinding chemistry on cyanide leaching of gold in the presence of pyrrhotite
In this paper, pyrrhotite was selected because this sulfide mineral is the highest cyanide- and oxygen-consuming iron sulfide mineral. With regards to grinding …
A previous investigation showed that corrosion currents estimated from polarization curves for the pyrrhotite - grinding media system under abrasion correlated well with corrosion currents estimated from marked ball wear test data by applying Faraday's law. Freshly abraded metal debris were magnetically attracted to pyrrhotite and lowered the rest …
A previous investigation showed that corrosion currents estimated from polarization curves for the pyrrhotite - grinding media system under abrasion correlated well with corrosion currents estimated from marked ball wear test data by applying Faraday's law. Freshly abraded metal debris were magnetically attracted to pyrrhotite and lowered the rest …
During wet grinding the electrochemical interactions between grinding media and pyrrhotite not only acelerate media wear but also adversely affect the sulfide minerals flotation response. A possible … Expand. 18. Save. An investigation of surface oxidation of pyrite and pyrrhotite by linear potential sweep voltammetry.
Rest potential and galvanic current measurements were made on an electrode combination of pyrite and pyrrhotite under nitrogen, air and oxygen aeration conditions. ... K.S., and Leja, J., 1979, "Effect of Grinding Media on Surface Reactions and Flotation of Heavy Metal Sulfide," Flotation, A.M. Gaudin Memorial Volume, Vol 1., M.C ...
