The recovery of these copper minerals by flotation or hydrometallurgy from ores, typically containing 0.5%TCu (open pit mines) and 1-2%TCu (underground mines) is of great commercial importance ...
The separation of chalcocite (Cu 2 S) and heazlewoodite (Ni 3 S 2) from high nickel matte can be achieved by maintaining the proper pH and pulp potential while using xanthates as collectors.The flotation recovery of Cu 2 S and Ni 3 S 2 has been studied by adjusting the oxidation–reduction potential of the flotation pulp with (NH 4) 2 S 2 O 8 and KMnO 4.The recovery of Ni 3 S 2 is almost zero ...
Chalcocite: Will G, Hinze E, Abdelrahman A R M (2002) Crystal structure analysis and refinement of digenite, Cu1.8S, in the temperature range 20 to 500 C under controlled sulfur partial pressure European Journal of Mineralogy 14 591-598: 2002: synthetic: 0: 293: 0010817: Chalcocite
improved, since the majority of the chalcocite particles have already been depressed. Eventually, some surface oxidation of molybdenum begins to occur, causing a drop in Mo flotation recovery. Fig. 2 gives the flotation recovery and concentrate grade for molybdenum as a function of pulp pH at a …
Results of flotation tests revealed that selectivity of emulsified kerosene is the best of three collectors in separation of chalcocite and molybdenite, though the others also display excellent ...
chalcocite flotation amine separation Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US302762A Inventor Anderson W Ralston Ervin W Segebrecht
Flotation tests were carried out on 'fresh chalcocite' and oxidized chalcocite. For the test of oxidized chalcocite, the procedure for oxidation was the same as previously described, except the particle size of chalcocite (-65/+325 mesh) was …
Corpus ID: 104305040. Electrochemical conditioning of a mineral particle bed electrode for flotation @inproceedings{Gebhardt1988ElectrochemicalCO, title={Electrochemical conditioning of a mineral particle bed electrode for flotation}, author={J. Gebhardt and …
Richardson and Walker showed that the flotation of chalcocite, bornite, chalcopyrite and pyrite with potassium ethyl xanthate is controlled by the conditioning potential, similar to earlier findings by Heyes and Trahar. The active surface entities for chalcocite and bornite
flotation of the investigated sulfides appears at a rather high, about 20 kg/ton, admixture. When either N- or G- dextrins were added, chalcocite was more sensitive to depression than galena. S-dextrins depressed neither galena nor chalcocite. Fig. 1. Flotation of chalcocite in the presence of various dextrins (pH = 6.4-7.2) Fig. 2.
1 Froth Flotation – Fundamental Principles Froth flotation is a highly versatile method for physically separating particles based on differences in the ability of air bubbles to selectively adhere to specific mineral surfaces in a mineral/water slurry. The particles with attached air …
The flotation of four copper sulfide minerals (chalcopyrite, chalcocite, bornite, covellite) and pyrite with xanthates shows that a minimum in the collector concentration necessary for flotation ...
Chalcocite was more active and therefore presented a stronger galvanic interaction with pyrite. Consequently chalcocite was more oxidised, which not only depressed its flotation but also produced sufficient copper ions to activate pyrite, making the separation of chalcocite from pyrite more difficult.
Chalcocite did not ignite in the temperature range studied but exhibited a rapid weight gain, because of the rapid conversion of copper sulfide to sulfate. Likewise, ga lena failed to ignite but underwent a steady weight gain when oxidized in a moist atmosphere, showing conver ...
In a pH 9.2 sodium tetraborate buffer, chalcocite floated with ethylxanthate at applied potentials ⩾ − 0.25 V (versus the standard hydrogen electrode); pyrite floated at potentials ⩾ 0.15 V. Differential separation of a chalcocite-pyrite mineral mixture was obtained by controlling the potential, but the flotation response of the mixture ...
The flotation of chalcocite, bornite, chalcopyrite, and pyrite has been studied in a microflotation cell in which the potential of a bed of the mineral particles could be controlled electromechanically. The ethylxanthate-induced flotation of each mineral is markedly dependent on electrochemical potential, with the recovery changing from 0 to 100 pct in potential intervals of - 0.2 V.
Chalcocite recovery was 42.8% in 8 min flotation, which is much lower than that in the single chalcocite flotation. Pyrite recovery was 24.8%. Pyrite recovery was 24.8%. With the collector addition, chalcocite recovery was increased significantly to 78% at 120 g/t collector and then increased slightly with further collector addition.
Great pH to Recover Cu. pH 7.5-8 is where Zn/Fe are least hydrophobic while Pb (and Cu) is most hydrophobic. Great pH to Recover Pb. pH 10.5-12 is where Fe is least hydrophobic while Zn (and Cu/Pb) is most hydrophobic. Great pH to Recover Zn. By modifying Flotation pH to create kinetic/speed differences between the metals and achieve sequential ...
The interactions between chalcocite and ethylxanthate have been examined in an electrochemical-microflotation cell containing a particle-bed working electrode. Cyclic voltammetry has shown the formation of a chemisorbed product commencing at −0.5 V versus SCE with a bulk oxidation product, possibly cuprous xanthate, forming above −0.23 V. Relating the charge passed on a potentiostated ...
Chalcocite is the most abundant secondary copper sulfide globally, with the highest copper content, and is easily treated by conventional hydrometallurgical processes, making it a very profitable mineral for extraction. Among the various leaching processes to treat chalcocite, chloride media show better results and have a greater industrial boom. Chalcocite dissolution is a two-stage process ...
The flotation of chalcocite, bornite, chalcopyrite, and pyrite in an electrochemical-flotation cell. In: XVth International Mineral Processing Congress, tome II, 1985. p. 198–210. Google Scholar. 42. Gebhardt J.E. and others. Electrochemical conditioning of a mineral particle bed electrode for flotation. United States Bureau of Mines.
Request PDF | On Apr 1, 2014, Xumeng Chen and others published The separation of chalcopyrite and chalcocite from pyrite in cleaner flotation after regrinding | Find, read and cite all the ...
Using microflotation method, this study explored the collectorless flotation of Chalcocite and its dependence on the redox potential of pulp . Electrochemical studies were performed by cyclic voltammetry in specific potential ranges and at different pH values. The results show that significant floatability of Chalcocite occurs in the specific reducing conditions.
Chalcocite is an important copper ore. It has a high copper content and the process of extracting the copper from the sulfur in Chalcocite is relatively easily. Chalcocite is also an important collector's mineral, and good crystals command very high prices. In Europe, a classic Chalcocite locality is Cornwall, England.
In this stage, ball mill and spiral classifier are indispensable. Third stage:The qualified copper powder is sent into the flotation machine to mix flotation. In this stage,spiral chute and flotation is necessary. Forth stage:The resulting powder enters into the dryer to be concentrated copper powder. The last stage need machine is dryer.
Chalcopyrite or chalcocite recovery as a function of flotation time in the presence and absence of bentonite (a) and zeta potentials of the three minerals (b) (Peng and Zhao 2011).
Chalcocite responds well to flotation. In Nchanga though it is lost mainly to very coarse and very fine size fractions of the concentrator tailings. This is because Nchanga flotation feed contains atypically high proportions of these fractions even at a moderate 55% passing 74 micron grind, a characteristic of Nachanga ore.
chalcocite, bornite and others. The recovery of gold-containing pyrite to the ... Mineralogical diagnosis of feed and product streams from the copper flotation circuit have shown that the copper bearing minerals are well liberated and thus further liberation of the copper minerals was not selected as a method
Chemistry of Flotation. Maurice C. Fuerstenau, J ... added addition adsorbed adsorption AIME amine anions approximately aqueous bonding bubble calcite calcium carbonate carboxylate cations chalcocite chalcopyrite charge Chem chemical chemisorption coal collector Colloid complex concentration constant contact angle containing cuprous cyanide ...
It usually contains over 20% of copper, but a difficult chalcopyritic ore may yield a concentrate with less than that percentage, while it is theoretically possible to obtain one running over 75% should the mineral consist entirely of pure chalcocite. The flotation of native copper ores is nearly always preceded by gravity concentration in jigs ...
The chalcocite is prepared for leaching by breaking the massive pieces of mineral with a hammer. Most of the quartz is rejected and the small pieces of chalcocite are crushed with an agate mortar and pestle. The crushed material is sized with a series of Tyler screens to yield the size
flotation of Chalcocite against potential at pH=4. Chalcocite showed good floatability in reducing conditions and the maximum recovery, 73%, was obtained at E= -222 mV (Eh= -17). By increasing the potential, the floatability of Chalcocite was reduced to 18% at potential 602 mV (Eh=807). ...