Studies in the selective flocculation of hematite from gangue using high molecular weight polymers. Part 1: Chemical factors |
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| Authors: | DF Bagster JD McIlvenny |
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| Institution: | 1. Department of Chemical Engineering, University of Sydney, Sydney, NSW 2006, Australia;2. Technical Centre, Dow Chemical (Australia) Ltd, Altona, VIC 3018, Australia |
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| Abstract: | The selective flocculation of hematite from silica has been studied from a chemical standpoint. Flocculation was induced in a stirred vessel under various reagent dosages, flocculant, dispersant and electrolyte, various pHs and slurry densities. The effectiveness of a given treatment was examined by the resulting grade of material reaching the outlet of a setting tube compared with the quantity.It was confirmed that selective flocculation is more favourable with more highly charged anionic polyacrylamide flocculants and with higher molecular weight. The process appears insensitive to dosage of flocculant in the range 1.5 to 10 ppm, but slurry densities must be kept low.Under such conditions the use of redispersion produced little gain in grade of hematite fraction but considerable loss in recovery. |
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