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The changing of superficial properties of some non-ferrous minerals as a result of ionic-molecular composition of flotation pulp
Published in Gülhan Özbayoğlu, Çetin Hoşten, M. Ümit Atalay, Cahit Hiçyılmaz, A. İhsan Arol, Mineral Processing on the Verge of the 21st Century, 2017
In this way, in the presence of the copper ions, the sulphide minerals are activated according to the following mechanism: (P. Ilie 1989) Stimulated by the oxidation of chalcopyrite, according to the above shown reactions, copper ions shift into the solution;Diffusion of the ions from the solution towards the mineral’s surface;Copper ions’ fastening on mineral surfaces, resulting in covellite formation. Copper ions’ sorption process is subjected to the Langmuir equation, which states that this sorption is a primary adsorption of the surface isomorphous ions. The activation with copper ions results in an increase of the xanthates’ adsorption and of the adsorbed collector’s fastening stability.
The effect of grinding circuit efficiency on the grade and recovery of copper and molybdenum concentrates
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2022
Ataallah Bahrami, Fatemeh Kazemi, Morteza Abdollahi, MirSaleh Mirmohammadi, Abolfazl Danesh, Yousef Ghorbani
A) Primary thickener or Copper-Molybdenum Concentrate (code T-A): Thickener T-A underflow incorporates minerals called chalcopyrite, pyrite, chalcocite, molybdenite, covellite, and a small amount of bornite. Figure 3 shows images of the distribution of these minerals in the thickener T-A underflow. The dimensions of the mentioned minerals are different which warrants pyrite larger size in comparison to most of the copper sulfide and molybdenite minerals in the sample. From a dimensional range standpoint, the particle size of chalcopyrite is observed in a larger range compared to pyrite (i.e., much smaller to larger than pyrite). Pyrite particles are closer in size to each other. Molybdenite particles do not have significant interlocking with other minerals, and their blade-shaped crystals have reached the desired degree of liberation. In general, most minerals are liberated, and only in some cases is there a slight locking between chalcopyrite and chalcocite and, to a lesser extent, chalcopyrite with covellite. Therefore, it is expected that a good separation between copper and molybdenum minerals will be achieved via the flotation process.
An Analysis of Copper Concentrate from a Kupferschiefer-type Ore from Legnica-Glogow Copper Basin (SW Poland)
Published in Mineral Processing and Extractive Metallurgy Review, 2021
In Table A3 the mineral composition of the investigated concentrate is presented. The content of all sulfide minerals is about 33%. The sample contains copper sulfide minerals as chalcopyrite, bornite, chalcocite with digenite/djurleite and covellite. Moreover, among the sulfide minerals, the concentrate contains relatively high contents of pyrite with marcasite, galena and sphalerite. Assuming that the content of all sulfides is 100%, the content of non-copper-bearing sulfides in the concentrate is about 30%. The main gangue minerals occurring in the concentrate are clay minerals with micas, calcium and magnesium carbonates and quartz with a content about 46%. The presence of quite high contents of gangues and non-copper-bearing sulfides, equal to 67%, is one of the main reasons for the dilution of the concentrate, which significantly lowers the copper grade in the concentrate.
A Densimetric Analysis of Flotation Concentrate from Kupferschiefer-type Copper Ore
Published in Mineral Processing and Extractive Metallurgy Review, 2021
Andrzej Luszczkiewicz, Alicja Bakalarz, Magdalena Duchnowska, Piotr Karwowski
The density of pure kerogen is estimated at 1180–1250 g/dm3 (Collell et al. 2014; Okiongbo, Aplin and Larter 2005) while the most base metal minerals, including almost all sulfide minerals, have a density above 4000 g/dm3 and are generally regarded as heavy minerals in this work. It is assumed that organic substances of natural origin, including various types of organo-mineral fossil substances, have densities in the range of 1200–1700 g/dm3 (Chenu and Plante 2006; Collell et al. 2014; Jagadisan, Yang and Heidari 2017; Mastalerz et al. 2012). The main sulfide minerals found in the copper ores of the LGOM area are the chalcocite-digenite group, bornite, chalcopyrite, covellite, galena, sphalerite, and pyrite-marcasite. In contrast, the major gangue minerals are: quartz, dolomite, calcite, clay minerals (sheet silicates), and organic matter (Bakalarz, Gloy and Luszczkiewicz 2015; Kucha 1990, 2007). Table 1 lists the specific densities of such minerals according to the Handbook of Mineralogy edited by Anthony et al. (2004). Unfortunately, there are no data on the actual density of individual minerals from the LGOM deposit.