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The results of artificially mixed mineral flotation tests (with −10 µm serpentine) showed that by extending the conditioning time from 60 to 360 s, a large amount of Mg 2+ on the mineral surface gradually dissolved into the pulp, resulting in a decreased brucite recovery (from 83.83% to 76.79%) and an increased recovery of serpentine from 52 ...
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The flotation separation between sulfides and fine serpentine has always been a difficult problem due to their hetero-coagulation. To acquire a better understanding on the adverse effect of fine serpentine on Cu-Ni sulfide flotation, rheology measurements and flotation tests on Cu-Ni sulfide/serpentine system were explored under different conditions in this study.
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The present invention relates to a new hydrometallurgical process for recovering nickel from nickel bearing raw materials, such as sulphide flotation concentrates. In general, the process involves the oxidative atmospheric pressure leaching of nickel sulphide concentrates using a sodium chloride/hydrochloric acid based leach media.
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Nickel sulfide ores undergo flotation (differential flotation if Ni/Fe ratio is too low) and then are smelted. After producing the nickel matte, further processing is done via the Sherritt-Gordon process. First copper is removed by adding hydrogen sulfide, leaving a concentrate of only cobalt and nickel. Solvent extraction then efficiently ...
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Flotation is affected by several factors, part of which depends on the mineralogical characteristics of the ore and part on process variables. Sulfide Ni-Cu ores occur typically in mafic and ultramafic igneous rocks. Serpentine minerals are also common. As a consequence of metamorphosis, sulfides and secondary minerals may be finely disseminated in an altered ore matrix.
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The flotation of nick el sulphide minerals is normally difficult in the presence of serpentine minerals due to the coating of serpentine particles on …
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The flotation of nickel sulphide minerals is normally difficult in the presence of serpentine minerals due to the coating of serpentine particles on …
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Serpentine minerals are magnesium rich but may contain iron and nickel. ... It is obvious that there are still many unknown reactions and processes in nickel separation, and in sulphide flotation generally. They include the interaction of ions and process iron, for example. Viscosity effects are also an interesting field.
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Froth Flotation (Sulphide & Oxide) ... A flotation testing program on nickel ore with an important degree of oxidation should evaluate the effect of sulphidization. The typical reagent is NaHS. ... Other factor to consider is the presence of gangue minerals such talc or serpentine because they can create some problems during the rougher ...
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Wellham et al. [21] studied the role of carboxyl methyl cellulose in the flotation of a nickel sulfide transition ore. The hypersaline water used in the flotation plants was reported to make traditional serpentine dispersants ineffective. Klimpel [22] claimed that sea water could be applied in flotation quite successfully.
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In nickel-copper sulfide ore processing, serpentine is a common gangue mineral encountered in complex sulfide ores and can easily cause entrainment during flotation [].Large amounts of serpentine in the flotation concentrate reduces the effectiveness of smelting, often resulting in the imposition of smelter penalties on mineral processing companies [].
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Interaction with MgO-minerals is one mechanism suspected to reduce selectivity in flotation of pentlandite from ultramafic ore. Understanding the surface chemistry of the minerals involved will lead to improved flotation conditions that maximize flotation selectivity. The first part of the thesis compares isoelectric point (i.e.p.) and point of zero charge (p.z.c.) determined using …
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The process exploits the particle size dependence of nickel sulphide flotation and the different ways that pH change and pulp density influence the response of coarse and fine particles ...
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The results show that the hetero-aggregation between serpentine and pyrite results in the attachment of serpentine slimes to pyrite surface and changes the surface characteristics of pyrite, thus the flotation recovery of pyrite decreases. Addition of various reagents which can produce carbonate is found to improve pyrite recovery during flotation.
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in the flotation of a nickel sulfide transition ore. The hypersaline water used in the flotation plants was reported to make traditional serpentine dispersants ineffective. Klimpel [22] claimed that sea water could be applied in flotation quite successfully. In …
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Abstract: Effect of butyl xanthate, butylamine aerofloat and thiamine esters used alone and in combination on flotation of low-grade nickel sulphide ore were studied. The results showed that the nickel grade of rougher concentrate was up to 3% when butyl xanthate or thiamine esters was used alone for flotation of nickel sulphide ore, but recovery was low; when butylamine …
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1. Introduction. Serpentine is a common gangue mineral encountered in complex sulfide ores (Bremmell et al., 2005, Wiese et al., 2007).In nickel sulfide ore processing, serpentine may report to the flotation concentrate via composite particles or through attachment to the valuable minerals as "slime coatings" (Edwards et al., 1980, Wellham et al., 1992, …
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Abstract: In nickel sulfide processing, magnesium silicates (serpentines) can easily form slime coatings or hetero-aggregation on pentlandite surfaces, and hence decrease the pentlandite flotation rate and recovery. In this work, magnetic separation of pentlandite from serpentine using selective magnetic
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The Effect of Oxidation on the Flotation Behaviour of Nickel-CopperOres S Kelebek 1 ABSTRACT Surface oxidation is one of the most imponant factors that influence the flotation selectivity and recovery in the processing of complex sulphide ores. It is an inherent part of surface chemical reactions that determine
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In nickel-copper sulfide ore processing, serpentine is a common gangue mineral encountered in complex sulfide ores and can easily cause entrainment during flotation [ 1 ].
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4/6/2007· Due to the complex structure of mineralization, a combination of gravity-separation and flotation methods was applied for the concentration of nickel sulphide and oxide ores. A nickel concentrate containing 12.32% Ni was produced with 89.7% recovery and final tailings with 0.088% Ni can be disposed with 4.9% of metal loss.
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For low grade nickel ore composed of nickel sulphide and oxide minerals, the head grades are Ni 0.66%, Cu 0.35% and MgO 28.60% respectively, by using a simple flotation flowsheet including three cleaners and some effective reagents such as the collector coordinative reagents of ethyl xanthate(EX) with ammonium butyl dithiophosphate(ABD) and the depressant for …
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In the flotation process of serpentine-containing copper-nickel sulfide ore, serpentine slime coatings significantly reduced the flotation performance of copper-nickel sulfide. Sodium phytate is a highly effective dispersant for MgO control in the flotation of copper-nickel ore.
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The inadvertent dissolution of gangue minerals is frequently detrimental to the flotation of valuable minerals. We investigated the effect of conditioning time on the separation of brucite and serpentine by flotation. By analyzing the Mg 2+ concentration, relative element content, and pulp viscosity, we studied the effect of mineral dissolution on brucite flotation.
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The role of carboxy methyl cellulose in the flotation of a nickel sulphide transition ore[J]. Minerals Engineering, 1992, 5(3-5):381-395. doi: 10.1016/0892-6875(92)90218-X. CrossRef Google Scholar [11] Pietrobon M C, Grano S R, Sobieraj S, et al. Recovery mechanisms for pentlandite and MgO-bearing gangue minerals in nickel ores from western ...
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This study investigated the effect of oxygen and micro-cracking on the flotation of low grade nickel sulphide ore. The ore treated contained serpentine minerals which have a history of being difficult to process efficiently. The use of oxygen as a bubbling gas has been noted to be effective because it increases the pulp potential.
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The sulphide minerals in nickel ores are easily floatable without a collector in acid pulp due to oxidation and, therefore, their separation is not possible at low pH. Alkaline pH depresses particularly pyrrhotite but does not have a significant effect on chalcopyrite. Nickel recovery is moderate and remains between these two.
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A method for the flotation of nickel and copper sulphide minerals from talcose bearing ores using an alkaline circuit in which at least one of the alkaline reagents is soda ash or ammonium hydroxide and following conditioning of the pulp with a collecting agent of the xanthate family to activate the nickel and copper sulphide materials, the pulp is conditioned with a flocculating …
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the flotation recovery of ni, Cu and Co from a nickel-copper sulphide ore. the effect on flotation performance of various parameters such as ph, collector dosage, solids and depressant dosage at different levels was investigated. therefore, the main objective of the study was to optimize the process parameters for the flotation of
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A nickel-copper sulfide system usually coexists with serpentine in deposits. Low nickel-copper recovery and high content of serpentine in concentration adversely affects subsequent metallurgical processes. In this study, test data showed different rheological results at various densities. When the solid ratio of sulfide to serpentine was 1:1, lower pulp density …
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flotation, nickel sulphide rougher flotation, nickel sulphide cleaning flotation, magnetic recovery of ... mostly Mg-Serpentine and very little Fe-Serpentine. This information was entered in the block model and the Bwi and Axb are estimated in mill feed in the feasibility model.
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A method of concentrating nickel sulfide ores by flotation which comprises subjecting the ore in the form of a pulp to a flotation process in the presence of an effective quantity of a flotation collector comprising a dithiocarbamate compound corresponding to the formula ##SPC1## Wherein X is oxygen or sulfur and R is hydrogen or a hydrocarbon radical containing from 1 to …
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In order to improve the flotation of nickel sulphides, sodium hexametaphosphate, sodium silicate, carboxymethyl cellulose (CMC), and other agents are used to disperse serpentine coating from sulphide surfaces in the flotation of the Jinchuan deposit and other nickel ores in China ( Kirjavainen and Heiskanen, 2007; Lu, et al., 2011).
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