Chalcopyrite illustration

Figure 10.11 presents the sehematic flowsheets of potential controlled flotation separation to recover chalcopyrite and pyrite from a copper-sulphur ore. Flowsheet I is collectorless flotation of chalcopyrite and then collector floatation of pyrite. Flowsheet II is collectorless flotation of chalcopyrite and then sodium sulphide-induced flotation of pyrite. Batch flotation results are illustrated in Table 10.5. It is evident that both flowsheets are suitable for flotation separation of copper-sulphur ore. The feed ore assayed 0.38% Cu and about 6% S, the copper concentrate obtained assayed 18%- 19% Cu with a recovery of 89%. For sulphur concentrate, the grade is 37%-43% S with a recovery of 82% - 85%. Interestingly, flie grade of sulphur concentrate is higher using sodium sulphide induced flotation than collector flotation. 

Fig. 9.3. Band diagrams of chalcopyrite/buffer/TCO heterojunctions illustrating the influence of buffer doping and interface charge...

The Funiushan copper deposit is a skam deposit on the inverted northern limb of the western Tang-Lun anticline. It occurs within the contact zone of a quartz diorite and comprises chalcopyrite, subordinate pyrite and sphalerite, as well as minor amounts of magnetite and martite. The ore body lies beneath sedimentary formations and 20-30 m of eluvium and alluvium. Thermally-released Hg was determined along three soil traverses. As the traverse illustrated in Fig. 13-4 shows, the Hg, pattern picks out the mineralisation better than the Hg, pattern. The shape of the Hg, anomaly is characterized by twin peaks over the margins of the ore body. A large thrust fault seems to have a role in anomaly development. 

Figure 5.8 Chalcopyrite grains imbedded in a prepolished conductive epoxy substrate as imaged by (a) SEM, (b) EDX (the Ni distribution shown), and (c) SIMS operated in the microscope mode (the CsNF secondary ions are displayed). The SIMS image resolution is defined via line scan analysis (see white line in SIMS image) as illustrated in (d) and in (e). Raw MCs signals, where M is an isotope of Nickel, are shown.

In order to completely define equilibria with external phases in ternary compounds, it is necessary to specify the activities of two of the components of the compound. Schmalzried treats ternary compounds as pseudobinaries in which each component is a binary compound. According to this assumption, chalcopyrite, CuFeS2, may be viewed as CuS FeS, and spinel as MgO AI2O3. We can use the general formula ML2O4 for a spinel in order to illustrate Schmalzried s approach. The formula may be rewritten (1 -I- a)MX (1 -I- j )L2X3, where (1 -I- /S)/(l -I- a) = 1 -I- y, and y is an indication of the degree of nonstoichiometry. For a = = 0, the compound is stoichiometric. 

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