By G. S. Dobby, S. R. Rao
Read Online or Download Processing of Complex Ores. Proceedings of the International Symposium on Processing of Complex Ores, Halifax, August 20–24, 1989 PDF
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Extra resources for Processing of Complex Ores. Proceedings of the International Symposium on Processing of Complex Ores, Halifax, August 20–24, 1989
Example text
1981). A rational interpretation of particle size in flotation. J. J. Warren (1976). The floatability of very fine particles. , 3, 103-131. S. Ek Institute of Metallurgy, rue Stevart, 2, Liege, Belgium ABSTRACT Complex ores from different orebodies and with varying amounts of pyrite have been floated to recover the associated non ferrous sulfides. The results of the bench tests have been tentatively related to the characteristics of the ore minerals as revealed by optical microscopy, electrokinetic potential measurements and collector adsorption dosage by UV spectrophotometry.
6 after 15, 30, 80 and 300 minutes of adsorption time, respectively. This indicates that the orientation of the adsorbed species gradually changes with coverage. The largest amount of oriented molecules and/or the highest angle of inclination of molecules to the chalcocite surface is observed at an adsorption time close to 15 minutes. Adsorption of Dithiophosphate Figure 9 shows the reflection spectra of the adsorption layer of dithiophosphate after various treatment times. As in the cases for the collectors discussed above, different spectra are recorded for both polarizations.
8. Proposed molecular orientation of thionocarbamate on chalcocite. PROCESSING OF COMPLEX ORES 37 Close inspection of the spectra in Fig. 7 and comparison with the spectrum shown in Fig. , a 1:1 cuprous thionocarbamate complex. The previous XPS study (Mielczarski and Yoon, 1989b) supports the model presented for the adsorption of thionocarbamate on chalcocite (Fig. 8 ) . These results indicate that a six-membered ring 1:1 complex copper-thionocarbamate is formed on the chalcocite surface. For s-polarization (Fig.