| 00:00:00 | Froth Flotation in mining, minerals and metals |
| 00:02:37 | Use your computer headphones or speakers. If you prefer to use your telephone to listen to the audio, please click on request audio in the participant panel. |
| 00:03:00 | Untitled |
| 00:03:50 | Abstract |
| 00:03:55 | Obligatory opening quotation |
| 00:04:35 | VIDEO: Ultramafic Nickel Ore Flotation-video |
| 00:04:35 | Industries |
| 00:05:35 | Synopsis of the Science |
| 00:06:59 | Ever wondered about the Golden Fleece? |
| 00:07:38 | History |
| 00:08:43 | Elmore process |
| 00:10:03 | Elmore process |
| 00:10:28 | Elmore patents |
| 00:10:50 | T A Rickard “The Flotation Process” page 25 Mining and Scientific Press (1916) |
| 00:11:47 | E J Pryor “Flotation’s Early Years” pp 217 – 240 in M C Fuerstenau, “Froth Flotation: 50th Anniversary Volume” American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc, New York (1962) Quote on page 219 |
| 00:12:35 | Importance of the bubbles |
| 00:14:07 | Rickard (1916) (known as “T. A.”) |
| 00:15:19 | A M Gaudin ‘Flotation’ 2nd Edition McGraw-Hill (1957) |
| 00:16:01 | The overall system |
| 00:16:53 | Bulk and surface effects…. |
| 00:17:32 | Chemicals involved in flotation |
| 00:19:19 | General plot of recovery against size |
| 00:20:13 | Particle size, collector, and frother |
| 00:21:07 | Frother |
| 00:21:49 | Collector |
| 00:23:37 | “Interaction” between the collector and mineral |
| 00:25:13 | Idealized situation – it’s all about the surface |
| 00:26:10 | The importance of locked particles |
| 00:27:38 | “Hydrophobic”/”hydrophillic” |
| 00:28:04 | Contact angleGaudin pp 340, 341, 355Note: “After Wark” |
| 00:28:50 | Contact angle (Klimpel page 11)Note: we now have ‘coal’ as the surface not galena |
| 00:29:41 | Xanthates of higher molecular mass give better recoveries |
| 00:30:21 | This relates to the contact angles |
| 00:31:03 | Direct measure of interaction - AFM |
| 00:32:09 | Electrochemical phase diagrams |
| 00:32:56 | Electrochemistry |
| 00:33:30 | The Wark and Cox papers |
| 00:34:41 | For oxide minerals, oleic acid is the classic molecule |
| 00:35:20 | Zeta-pH-flotationhttps://era.library.ualberta.ca/public/datastream/get/uuid:5f273415.../DS1M D Parrent “Separation of Pyrolusite and Hematite by Froth Flotation” thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of t |
| 00:36:11 | pH |
| 00:37:11 | Flotation & pH |
| 00:38:01 | Point of Zero Charge (PZC) |
| 00:39:32 | Untitled |
| 00:40:23 | Be aware of the chemistry….. |
| 00:41:00 | Selectivity |
| 00:41:59 | Efficiency |
| 00:43:26 | Time - kinetics |
| 00:43:58 | Time – kinetics - consecutive flotation cells |
| 00:44:50 | From Gaudin (pages 411/412) |
| 00:45:41 | Freshly cleaved PbS/galena |
| 00:47:31 | NaCN |
| 00:48:08 | Use of Na2S (depressant) |
| 00:48:59 | In the presence of NaCN then the plots are reversed |
| 00:49:24 | Sequence for mixed sulfides |
| 00:49:57 | Summary |
| 00:50:31 | References |
| 00:51:33 | Contact Information |
An introduction to the principles of froth flotation and the importance of the measurement of zeta potential