Even at this grind microscopic examination shows inclusions of chalcopyrite in sphalerite grains. Zinc sulphate and cyanide are added to the regrind mill to effectively depress the sphalerite. Xanthate Z-11 or reagent Z-200 is added to the conditioner to promote the chalcopyrite and float it in the "Sub-A" circuit as shown.

The list of commodities is extensive, although the relative proportions mined underground and on the surface vary from mineral to mineral. Massive tonnages of hard coal and lignite are also produced from surface mines, although the terminology used – open cast or open cut, rather than open-pit – indicates that the technology and …

In this study, a high-energy planetary mill was used to perform mechanical activation of chalcopyrite in dry-, moist-, and wet-milling modes. Granulometric and …

MCA pretreatments were carried out by chalcopyrite co-milling with Fe and Fe 2 O 3 for 20 and 50 min. ... Ultimately, the proposed method obtained recovery efficiencies of 98.4% and 99.3% for Mo and W, respectively, achieving efficient and environmentally-friendly reuse of these key metals. View all citing articles on Scopus.

A mineralogy, rheology, and energy consumption-based experimental characterization of chalcopyrite ball mill grinding processes, in both batch and …

Fig. 1 illustrates the XRD pattern 2 for the as-received chalcopyrite. Pyrite and quartz are also present, as would be expected (see Table 1, Table 2).After 28.8 ks of simultaneous autogenous milling and leaching, chalcopyrite is not detected, but synthetic nantokite (CuCl) becomes the dominant pattern (see Fig. 2).This would seem to suggest …

Physical processing methods are widely applied in mineral separation. In the case of gold ores, physical separation can be employed to produce concentrates, and in the case of free-milling ores or to produce gold intermediate-enriched mineral products, by rejecting gangue material, which facilitates more effective hydrometallurgy.

Nanocrystalline CuAlFeS 2-mixed chalcopyrite has been mechanosynthesized at room temperature for the first time by ball milling the stoichiometric mixture of elemental powders of Cu, Al, Fe and S under argon atmosphere.It has been noticed that at early stage of milling, a nanocrystalline CuS has been formed. …

Moreover, the changes of quartz and pyrite peaks are much Fig. 4 XRD patterns of non-activated and activated chalcopyrite samples at various milling time less than that of chalcopyrite, which is due to the lower hardness of chalcopyrite (3.5âˆ'4 on Mohs scale), whilst the hardness of pyrite (6) and quartz (7) is much higher, and the ...

1. Introduction. Chalcopyrite is the main copper-bearing mineral on Earth and an important raw material for obtaining metallic copper. Froth flotation is considered an effective separation method for sulfide ores and has been applied at the industrial scale for many years [1], [2].Milling is a key procedure with a significant impact on the …

The CuFeS 2-BM catalyst was obtained via a facile mechanical milling method. Briefly, the high-purity chalcopyrite ores obtained from Yunnan, China were first mechanically milled in a planetary mill (QM-3SP04, inner volume of zirconia mill jar: 50 mL) loaded with zirconia balls (150 g, 8 mm and 5 mm in diameter, weight ratio of 1:1) for 1 h.

The elemental composition of chalcopyrite was determined by chemical titration method, Effects of mass ratio and mill speed. Fig. 2 shows the copper extraction of ground samples with a mass ratio of 1:0, 1:1, 1:2.5, 1:4 and 1:7 at different milling speeds for 1 h. Chalcopyrite leaching was carried out in pH 1 H 2 SO 4 solution at 348 K for 2 h.

The fine milling is an effective method to promote leaching processes [7]. Finely milled chalcopyrite particles (<20 μm), however, are known to become …

Mechanical activation by autogenous milling has previously been shown to improve leaching kinetics. In this study autogenous milling was conducted simultaneously with ferric chloride leaching. A sequence of products was observed, with chalcopyrite being replaced by synthetic nantokite (CuCl) and the nantokite being more gradually …

Simultaneous ball milling and leaching by sulfuric acid was applied to enhance copper leaching from copper concentrate consisted of chalcopyrite and pyrite with small amount of bornite.

The method is based on high-intensity grinding operations to induce physical-chemical modifications to the mineral/ore ... Oxidation of chalcopyrite by extended milling. Int. J. Miner. Process., 77 (2005), pp. 208-216, 10.1016/j.minpro.2005.05.001. View PDF View article View in Scopus Google Scholar.

This study presents a novel method to fabricate CuFeS 2 chalcopyrite thin films using a three-step synthesis of ball-milling, thermal evaporation, and sulfurization.

Flotation separation of chalcopyrite/pyrite mixtures under Mg(OH)2 depression effectively limits pyrite entrainment into Cu concentrates. However, the Cu concentrate is still negatively affected by the low selectivity of depression by Mg(OH)2 and unavoidable floatability activation of pyrite by surface Cu contamination via galvanic …

For example, in the flotation of chalcopyrite and galena minerals, the xanthate-K 2 Cr 2 O 7 depressant pair showed low recovery instead of using the dixanthogen-K 2 Cr 2 O 7 depressant, where the separation results are much better . The chalcopyrite flotation mechanism also takes into consideration the chemisorption of …

Ternary chalcopyrite CuAlS 2 and CuAlSe 2 nanorods have been successfully synthesized through hydrothermal method at 180 °C and their structure of prepared samples was investigated by X-ray diffraction pattern (XRD), scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HR-TEM). The …

The particle size distribution (PSD) characterizing the chalcopyrite head ore was determined using the standard meshes method. As shown in Table 1, this method involves gradually sieving the sample on 10 different meshes.At each sieving, the mass of ore retained on each mesh is weighed, which is used then to calculate the …

We report the investigation of a chalcopyrite leaching process that implements millimeter-sized glass beads that are stirred in the leach reactor to combine particle grinding, mechanical activation, and surface removal of reaction products. The paper focuses on demonstrating the impact of the so-called attrition-leaching phenomenon on the leaching …

In the present work, the mechanical activation by ball-milling with 10 min, 30 min, 60 min, 90 min, 120 min and 180 min time periods of bioleaching of chalcopyrite was studied, and then evaluated by a …

The aim of the current study has been to investigate the influence of mechanical activation through intensive milling of a chalcopyrite mineral sample on its BET surface area and the subsequent effect on its leaching reaction rate and mechanism. Leaching kinetics mechanisms of the raw and mechanically activated chalcopyrite in …

We report the investigation of a chalcopyrite leaching process that implements millimeter-sized glass beads that are stirred in the leach reactor to combine particle grinding, mechanical activation...

The results of chalcopyrite concentrate processing using low-temperature and high-temperature sulfuric acid pressure leaching are presented. A material of the following composition was used, 21.5 ...

DOI: 10.1016/S0304-386X(98)00088-7 Corpus ID: 96406400; Simultaneous autogenous milling and ferric chloride leaching of chalcopyrite @article{Maurice1999SimultaneousAM, title={Simultaneous autogenous milling and ferric chloride leaching of chalcopyrite}, author={David Maurice and Jeffrey A. Hawk}, journal={Hydrometallurgy}, year={1999}, …

Chalcopyrite is essentially unleached under the mild oxidizing conditions of heap leaching (very slow leach kinetics). It can, however, be leached under oxidizing conditions at elevated temperatures or by microbial leaching under low-potential conditions (Gericke, Govender, & Pinches, 2010).This has led to extensive study into leaching of …

focused on some combined methods. One of the methods is mechanical activation/extended milling as known pre-treatment of the concentrate before leaching process [17–21]. Another way is pressure leaching of concentrate or/and ore under the condition of high oxygen potential and acidic solution [22–26]. Although all of these …

The chapter provides a brief overview of the mechanochemical synthesis of binary, ternary, and quaternary metal chalcogenides. At the beginning, the introduction …