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.
A high pH is important in copper ore processing to maximize this mineral's flotation properties. Most copper ore slurries tend to be acidic. Plants typically add lime to the …
In fact, the xanthate induced flotation of copper sulfides could be affected by pulp potential, because Eqs. (3), (4) are favored in a nonoxidizing environment. ... They also found that the depressing effect of Cu 2+ is stronger in the pH range of 5–8.4 than that in the pH range of 2–5.
Highlights. •. Lime plays a critical role in flotation by controlling pulp chemistry and collector adsorption. •. Lime is the most economical and commonly used reagent for …
The effect of pulp oxidation potential, Eh, on the flotation of copper-activated pyrite at pH 9.0 in the presence of xanthate was investigated. It was found that pyrite recovery is at a maximum value when the Eh during conditioning is approximately 35 mV (SHE), but decreases at lower and higher Eh values. Solution and surface analytical ...
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.
Flotation tests on an industrial copper–lead bulk concentrate showed that using this depressant mixture can achieve highly efficient separation of chalcopyrite from galena at the natural pH of ...
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% passing …
The effects of flotation parameters including pulp density, collector dosage, frother dosage, and dispersant dosage were statistically examined to obtain an effective approach for...
Received 29.03.2001. Abstract Control of pH is one of the most widely applied methods for the modulation of mineral flotation. In this study the e ect of pH on potential in solution and sulphur minerals flotation is discussed with various electrodes. The electrodes were platinum, gold, chalcopyrite, pyrite and galena.
Dithionocarbamates are copper selective and pH responsive collectors [33, 34], thus, the effect of varying concentrations of copper sulphate (8–150 × 10 −6 mol/l) and pH (8.5–12) on flotation of pyrite and arsenopyrite was determined. 5 g of pyrite or arsenopyrite was conditioned in 100 ml of demineralised water at pH 11 using lime and ...
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 ...
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, …
Porphyry copper deposits are important sources of copper and typically processed by flotation to produce copper concentrates. As mining areas become deeper, the amounts of impurities, such as sphalerite, can be increased in copper ores, so the appropriate depression of sphalerite floatability should be achieved to obtain saleable copper …
Abstract. Within the flotation process the pulp phase chemistry has a strong effect on the froth phase and therefore the manipulation of pulp chemistry factors such as the pulp potential (Eh), pH, dissolved oxygen (DO) and ionic strength (IS) can improve flotation performance. Stability column and batch flotation tests were performed in the ...
The fresh copper oxide mineral surfaces exposed during crushing and grinding have a significant effect on subsequent flotation [23], [24], [25], [26].Many dangling bonds exist on fresh mineral surfaces because of destruction of the original lattice bonds, and the copper oxide mineral surface often shows strong polarity because of the …
Raw ores are mixed with filling materials during mining, which makes it difficult to sort copper‑sulfur resources. Inductively coupled plasma analysis revealed that the primary dissolved metal ions from the filling materials were Ca 2+ and Fe 3+.Flotation solution chemistry, flotation tests, and X-ray photoelectron spectroscopy measurements …
1. Introduction. In the flotation of sulphide minerals, collectors belonging to the xanthate class are most commonly used. Activators are chemical compounds usually added to promote the interaction of collector molecules with the mineral surfaces (Rao, 2003).The most common activator used in the flotation industry is copper sulphate and …
The effect of Ca(ClO) 2 concentration on the flotation of pyrite and covellite with ADD as the collector at pH 10 is presented in Fig. 6. It was noted that the covellite recovery did not change obviously and was maintained at >85.20%, indicating that Ca(ClO) 2 had little effect on covellite flotation.
The pH was monitored as the flotation pH. 3. The water-mineral mixture was then transferred into the microflotation cell, and floated with N 2 at an average flow rate of 25 cm 3 for 20 seconds. The final pH was measured to ensure that no appreciable change had occurred during flotation. 6.4. Results and Discussion 6.4.a. Effect of pH on the ...
The independent effects of calcium and magnesium were also evaluated. The experimental results show that enargite flotation in seawater is depressed at both reducing and oxidizing conditions at pH ...
The averages of maximum copper grade obtained in all tests were considered (Table 3).The effect of pulp density was −0,09 for a variation of 5%; This observation (also shown in Fig. 2 a) indicates that reducing the pulp density lead to an increase in the copper grade in the concentrate. This is similar to what has been …
This work investigated the effects of NaCl addition on galena flotation in the presence of xanthate. The micro-flotation experiments were performed using NaCl solutions which also included xanthate, at pH 9 (±0.1). Our results indicated that galena recovery improved for higher NaCl as well as higher xanthate concentrations.
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.
Effect of phyllosilicates on the copper grade in chalcopyrite flotation (adapted from Farrokhpay and Ndlovu, 2013). Some strategies to reduce the negative effect of clay minerals on the process of flotation are the use of a variety of reagents such as rheology modifiers and/or the use of reagents that adsorb on the surfaces of clay …
HABTC exhibited excellent affinity to chalcopyrite particles under pH 6-10 and achieved superior flotation recovery of copper minerals in comparison with sodium isobutyl xanthate (SIBX).
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 …
In this paper, we have reviewed the surface properties of common copper oxide minerals and summarized application of direct flotation, sulfidization flotation, and …
The pH values of 6 and 8 were selected as optimum pH for the lead and zinc flotation respectively. Lead, zinc, and iron flotation kinetic rates in the lead flotation stage at pH values of 6 and 8 were shown in Fig. 10. As it can be seen, there is a sharp increase in the lead recovery in the first minute and then the lead recovery gradually ...
both cases (copper grade and copper recovery) the parameter effects are. similar to be varied. A maximum recovery of copper was 88,58% while the grade was 2,88. with 32,29 copper oxide on the ...
Proceedings of the World Congress on Engineering and Computer Science 2011 Vol II WCECS 2011, October 19-21, 2011, San Francisco, USA Effect of pH on the Recovery and Grade of Base Metal Sulphides (PGMs) by Flotation Edson Muzenda, Member IAENG, Ayo S. Afolabi, Member, IAENG, Ambali S. Abdulkareem and Freeman Ntuli flotation of base …
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 …
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. …
DOI: 10.2320/matertrans.m-m2023805 Corpus ID: 258904791; Effect of pH and Precipitations on Copper–Molybdenum Rougher Flotation in Seawater @article{Tanaka2023EffectOP, title={Effect of pH and Precipitations on Copper–Molybdenum Rougher Flotation in Seawater}, author={Yoshiyuki Tanaka and …
Flotation data have shown that at pH 7 and 9 sodium bisulphite acts as a depressant for the xanthate-induced flotation of copper-activated pyrite with nitrogen or air purging. However, the ...
Collector type and pulp pH play an important role in the lead–zinc ore flotation process. In the current study, the effect of pulp pH and the collector type …
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.