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The earliest and most widely used collectors for scheelite are fatty acids and their soaps such as sodium oleate (NaOL), oxidized paraffin soap [5] and so on, which have good collecting ability but poor selectivity. Thus, it is often necessary to use a depressant to improve flotation selectivity [6]. Therefore, the correlational research on ...
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Pentlandite is very important to the mining industry since it is the main source of metallic nickel. However, its separation from hexagonal pyrrhotite by froth flotation is challenging due to their similar floatabilities, and inefficiencies in this process generate environmental issues caused by emissions of sulfur oxide gases during the …
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Abstract. Nickel ore dispersion before flotation using different reagents was investigated on a bench scale to improve metallurgical recovery and selectivity. The …
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Nickel producers have been using a number of different strategies, sometimes in combination, to reject pyrrhotite. ... The effect of collector ( PAX ) on the separation selectivity on pentlandite flotation. 47 Table 3.1 Flotation Procedure for Control Tests (A) REAGENT operation time min % solids pH CaO g PAX g/t remark grinding 20 61 6 0.2 ...
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The flotation results indicated that FGM had excellent depression selectivity for talc and chlorite minerals and little depression effect on copper–nickel minerals. Compared with the conventional depressant carboxymethyl cellulose, the FGM scheme increased the recovery of copper in Cu–Ni concentrates over 25% and nickel in …
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However, aqueous electrolytes present intrinsic selectivity limitations for electrodeposition processes, due to the similar standard reduction potentials between cobalt and nickel (E° Co = −0. ...
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High temperature experiments demonstrated that selective sulphidation is feasible. Sulphides were submicron in size but could be physically upgraded. Nickel …
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The maximum grade of nickel achieved by Sotation is around 28% Ni. Problems Associated with Sul de Mineral Flotation. The main problem encountered is selectivity of pyr- …
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Flotation. According to the difference in physicochemical properties of mineral particle surfaces, flotation is the method that selectively enriches the target minerals in the pulp at the gas-liquid interface and separates them from the pulp, thus realizing the mineral separation. It is also known as floating separation.
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The effect of thiosulfate was first weak but the flotability of pyrrhotite increased quite strongly during flotation, impairing the selectivity of flotation. The effect of the ions on the selectivity of nickel separation is illustrated in Fig. 4. As can be seen, especially calcium increased the selectivity of nickel flotation.
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Figure 5 shows pentlandite Modified flotation rate constant and selectivity index 275 recovery vs rock recovery. It is clear that the Pn/Rk selectivity at low gas rate is far better than at high gas rate due to the much reduced rock flotation rate. As shown in Table 2, the calculated Pn/Rk selectivity index at high gas rate is only 70, while it ...
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nickel in these ores while containing over 75 per cent of the sulphur. Therefore, efforts to reduce sulphur dioxide emissions from the smelting process have included the rejection of pyrrhotite in the milling stage as an alternative means of treatment. In the flotation process, a number of reagents are seen as a means ofdepressing pyrrhotite.
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A kinetic analysis of the flotation of various nickel–copper sulphide samples is presented. Two approaches of first order kinetics have been used to estimate the flotation rate constants of pentlandite and pyrrhotite for stockpile samples and fresh sample as a reference. ... The collectorless flotation selectivity index in the case of ...
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With the increase in collector dosage: - the magnesia grade rises, except for the pre-flotation stage sulphur to nickel ratio increases, i.e. the selectivity of nickel sulphides versus iron sulphides deteriorates The increase in magnesia content in the concentrate as the collector dosage increases can be explained in terms of differential ...
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The pentlandite–pyrrhotite flotation selectivity obtained with TETA and sodium metabisulfite ŽSMBS., respectively, was similar to that obtained under baseline conditions. ... Cobalt and nickel flotation recoÕeries Cobalt is a valuable by-product obtained from processing of nickel–copper sulphide ores. From the nickel and cobalt assays of ...
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Various techniques were reported to separate cobalt from nickel and other impurities such as iron, aluminum, and magnesium. Ion exchange resins [20], [21], [22], and solvent extraction [23], [24], [25] are among the most studied ones. However, ion exchange resins lack selectivity for cobalt and are more suitable for nickel extraction [20].
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flotation step needed prior to potash flotation. We also offer collectors for reverse flotation where halite is floated to beneficiate carnallite. Rely on our 80-years of expertise as the world-leading supplier of collectors to the potash industry to enhance flotation efficiency. Case description A potash customer using direct flotation of
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The conclusion is the same in Figure 17 for the selectivity of nickel flotation recovery over the MgO gangue mineral recovery. The reattachment of slime gangue onto clean nickel particles and the reformation of floc aggregates must be causing this reduction in flotation performance. This result was also observed when xanthate collector was not ...
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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. …
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The flotation results indicated that FGM had excellent depression selectivity for talc and chlorite minerals and little depression effect on copper–nickel minerals. Compared with the conventional depressant carboxymethyl cellulose, the FGM scheme increased the recovery of copper in Cu–Ni concentrates over 25% and nickel in Cu–Ni ...
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The selective flotation of pentlandite from a nickel ore. Nickel sulphide ores containing pentlandite, pyrrhotite and talc have traditionally been treated by bulk sulphide flotation, an approach which seeks to maximise nickel recovery and talc rejection but …
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An extreme sensitivity of pentlandite flotation towards pH regulator at pH 10 has been documented using two types of complex nickel–copper sulfide ores in Northern Ontario, Canada.The samples studied are from Sudbury and Timmins areas and differ in their mafic and ultramafic associations and degree of dissemination.
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This study revealed the possibilities of increasing the selectivity of collective flotation of copper–nickel ore. Under the conditions of the simplest collective cycle, …
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The use of sodium sulphite to improve the flotation selectivity between chalcopyrite and galena in a complex sulphide ore. Miner. Eng. (1992) R. Houot et al. ... Flotation tests and pulp chemistry measurements indicated that the combination of high chromium (Hi-Cr) steel and MBS completely depressed pyrite flotation in high salinity …
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Under the typical alkaline flotation conditions for ultramafic nickel ores, sodium citrate dissociates to form C 3 H 5 O ... High intensity conditioning (HIC) has been reported to improve the recovery and selectivity of valuable mineral by cleaning the pentlandite. Conclusions.
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Flotation feed and the test products (i.e., concentrates and tailings) were dried in an oven at 60 °C and analyzed for Pb and Zn contents by complexometric titration with EDTA as titrant and xylenol orange as indicator [14, 34].The procedure includes digestion of 1 g solid sample in a 250-ml glass beaker by 15 ml of concentrated HCI and 5 …
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FLOTATION OF NICKEL SULPHIDES Nickel is found to associate with talc and other readily floatable magnesia bearing silicate gangue minerals because rocks that contain most nickel are of the basic, or mafic class that contains much iron and magnesium. Selectivity between the nickel sulphides and the other sulphides such as chalcopyrite ...
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The ethyl xanthate and Aero 3418 collectors were used for lead flotation and Aero 3477 and amyl xanthate for zinc flotation. ... Aero 3418 A has a good selectivity against iron sulphide and Aero ...
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Four polymeric resins containing different chelating groups for transition metal ions (see Table 1) were first tested by a batch ion exchange method to find the most promising exchanger for nickel and cobalt sorption, selectivity, and elution characteristics.Resins Amberlite IRC748®, Ionac SR-5® and Purolite S930® present …
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Soda ash also increased nickel flotation selectivity against MgO mineral recovery, when compared with hydrated lime and it was suggested to act as a dispersant [7,8,9]. Ehm et. al. [10] suggested that, due to soda ash addition, the precipitation of dissolved metal ions as insoluble carbonate salts occurs which would otherwise have …
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