Fig. 3 shows the effect of NaClO concentration on the flotation separation kinetics of a bulk Cu-Mo concentrate. Experiments with 20 to 1,020 g/t NaClO, with a conditioning time of 5 min and pH 7, show that recovery of chalcopyrite decreases when the NaClO concentration increases, while molybdenite recovery is between 62 and 75% (Fig. 3 a).This behavior …
Grinding conditions affect the flotation of copper sulphide minerals as changes in the properties of the grinding media and their interactions with the sulphide minerals, and between sulphide minerals themselves, affect the chemical environment in the flotation pulp. Galvanic interactions between steel grinding media and sulphide minerals, and between sulphide …
The depressant system and pH play an important role in the selective copper and zinc flotation process. The current study examines the role of different depressants such as zinc sulphate …
Graphic Conclusions of this particular set of flotation tests: Copper – Irrelevant of pH, with enough float time and reagents, you usually reach a terminal bulk rougher Cu recovery in the low 90s (Green Box) – pH 10.3 gives you that terminal recovery in less mass (9%), more selectively, at a higher Conc grade (2.5%) VS the rest.
This is because there is a window of pH values at which copper (pH 5–6), lead (pH 7–7.5) and zinc (pH > 10) can be floated ... K., Batnasan, A., Kihara, Y., Shibayama, A., 2014. Fundamental study of the effect of flotation reagents on copper flotation with seawater. In: IMPC 2014 – 27th International Mineral Processing Congress. Google ...
The interaction of clay minerals with gypsum and its effects on copper-gold flotation. Miner. Eng., 77 (2015), pp. 121-130. View PDF View article View in Scopus Google Scholar [33] M. Shoaib, N. Cruz, E.R. Bobicki. Effect of pH-modifiers on the rheological behaviour of clay slurries: difference between a swelling and non-swelling clay. Colloid ...
The surface properties of enargite and its flotation response in conventional water was previously investigated by several researchers who used pure mineral samples (Fullston et al., 1999a, Fullston et al., 1999b, Kantar, 2002, Guo and Yen, 2008, Plackowski et al., 2012).It was shown that enargite flotation strongly depends on the pH and redox potential (E h) of the …
Download scientific diagram | Effect of pH on molybdenum flotation in absence of copper depressants (1 kg/Mg Na 2 SiO 3, 10 kg/Mg Na 2 S, 440 g/Mg gas oil, 56 g/Mg pine oil, 58 µm particle size ...
Results of flotation experiments in seawater indicated that the effect of pH on copper and molybdenum flotation maximum recovery seems limited. On the other hand, pH …
Here, rougher flotation is most Selective at a pH of 9.5 as pH levels in the 9 to 10 range yielded 1% to 2% better recoveries. Mineralogy data also supports this and shows between 3% and 10% of the copper is present as low-grade middlings in pyrite, and further supports the …
The redox potential, also known as Eh, is "a measure of the tendency of a solution to be oxidising or reducing" (Hu et al., 2009).It aids in predicting the regions of optimal flotation and estimating the surface conditions of sulphide minerals (Goktepe, 2002).Factors that affect pulp potential include: the grinding conditions such as: purging with oxygen or nitrogen; the …
Flotation of grinding products with 55, 60, 65, 70, and 75% of grain size <74 μm, was conducted at the pulp's pH values of 10 and 12. Higher copper recovery was obtained in concentrates at pH 10, but with lower copper grades, approximately 2%. Copper recovery in concentrates at pH 12 was slightly less, but copper grades were much higher.
In this paper, we have reviewed the surface properties of common copper oxide minerals and summarized application of direct flotation, sulfidization flotation, and activation …
High pH values, which is a good way to depress pyrite and therefore to favour the flotation of copper and zinc sulphides, do not have the same effect on seafloor ore.
The copper ore in Chilean copper porphyry deposits is often associated with molybdenum minerals. This copper–molybdenum (Cu–Mo) sulfide ore is generally mined from various locations in the mining site; thus, the mineral composition, oxidation degree, mineral particle size, and grade vary. Therefore, in the mining operation, it is common to blend the …
Results of flotation experiments in seawater indicated that the effect of pH on copper and molybdenum flotation maximum recovery seems limited. On the other hand, pH drastically influences copper and molybdenum flotation kinetic constant, it decreased a lot with increasing pH, and results of pH 8.5 and 9.0 is quite similar.
Amorphous silica has been recently recognized for its adverse effects on copper flotation, but its impact remains poorly understood. This study investigates the effects of …
Improving Flotation of Sphalerite - Effect of pH and Activating Potential on the Kinetics of Copper Uptake and Xanthate Adsorption on Sphalerite 6.1. Abstract ... It can be seen from Figure 6-2 that when activation was conducted at acidic pH (solid square), the copper uptake increases with activation time and reaches saturation, which is about 5
The effect of iron, substituted in the mineral lattice, on the froth flotation of sphalerite has been investigated at alkaline pH. It has been found that a critical copper sulphate concentration exists where sphalerite recovery is maximized, above which the recovery of sphalerite then decreases.
In the current research work, influences of particle size, grinding time, and agitation rate on the flotation of a copper sample from Sungun copper mine (E. Azerbaijan, Iran) containing 0.66% Cu ...
In this research, flotation of copper, lead and zinc minerals from a copper oxide–sulfide ore was studied. The identification tests showed that the sample is a mixture of quartz, chalcopyrite, galena, cerussite, hemimorphite and iron oxide minerals with 5.04% CuO, 1.61% PbO, 2.07% ZnO and 56.40% SiO2. The experimental design methodology (RSM) was …
To study the effect of frothing agents, solids content, pH and type of water (sea water or fresh water) particle size, hydrophobicity (type and dosage of collectors), airflow rate, impeller speed, etc., were maintained constant. ... Numerous copper flotation plants have to use high salinity water, but high salinity water is detrimental to ...
On the other hand, minerals in the slurry, solution pH, flotation agents, and operations of adding metal ions are placed in the category of indirect factors. ... Surface modification of hemimorphite with lead ions and its effect on flotation and oleate adsorption [J]. ... [101] ZHAO Qiang, LIU Wen-gang, WEI De-zhou, WANG Wen-dan, CUI Bao-yu ...
This manuscript examines these and other effects through process simulation of a flotation plant for copper ores. Based on these simulations, the relationship between particle size, energy ...
Effect of pH and precipitations on copper–molybdenum ore rougher flotation has been investigated in seawater with flotation experiments followed by precipitation estimation with …
The effect of water quality change on copper flotation Claudio Acuña 1, Camila Aedo 2, Claudio Leiva 1,3, ... of ions such as magnesium and calcium may have a negative effect (hydroxide formation) at basic pH. Since hardness shows similar values and the difference in dissolved solids lies in chloride, a positive kinetic effect is assumed. In ...
Lime was used to control the pH 9.5 at the end of grinding and during flotation. 2.3. ... The presence of Q38, Snobrite or bentonite had a deleterious effect on copper flotation, the extent of which depended on the pulp viscosity resulted. The higher the pulp viscosity, the lower was the copper recovery. ...
pH 10, copper recovery decrease amounts to 0.4 [%], while molybdenum shows a 2.4 [%] recovery increase. In addition, copper concentrate grade decreases by 1.4 [%], while …
In fresh water a strong effect of pH is observed and the froth layer thickness increases up to a maximum at around pH of 10.5. ... Castro, S., Ramos, O., Cancino, J.P. and Laskowski, J.S., 2012a. Frothing in the flotation of copper sulfide ores in sea water. In: Proc. International Symposium on Water in Mineral Processing. The 2012 SME Annual ...
In this work, the effect of fine fraction, pH, flocculant, and collector concentration on the shear yield stress of copper flotation tailings at concentrators placed at Sarcheshmeh and Shahrebabak ...
Accordingly, higher pH levels were adopted for cleaner flotation to enhance selective flotation of copper VS pyrite. Concentrate regrinding to a product size of 80% …
Variations in pH and Eh usually affect the chemistry of flotation reagents and species present in flotation water. For example, pulp pH can alter the form of some frothers and thus influence their effectiveness. ... E. coli has been found to have a negative effect on copper flotation mainly due to its attachment onto chalcopyrite surfaces and ...
In this study the effect of pH on potential in solution and sulphur minerals flotation is discussed with various electrodes. The electrodes were platinum, gold, chalcopyrite, pyrite and galena.
ABSTRACT. In this study, pyrite flotation in seawater in the presence of Cu 2+ and Pb 2+ and the underlying mechanisms were investigated systematically. Flotation results indicated that Cu 2+ and Pb 2+ increased pyrite recovery from 52.51% to 79.45% and 72.57% in weak alkaline seawater (pH 8) due to the increased surface hydrophobicity. Solution species …