Improving fines recovery by grinding finer
| Autor: | D. Curry, M. F. Young, J. D. Pease, N. W. Johnson |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Mineral Processing and Extractive Metallurgy. 119:216-222 |
| ISSN: | 1743-2855 0371-9553 |
| Popis: | It is commonly believed that fine particles have low flotation recoveries. Indeed, size–recovery graphs often are 'hill shaped' with high recovery in the mid sizes and low recovery at the fine and coarse ends. Yet rather than being due to 'overgrinding', fines recovery may be low because the grind is not fine enough! The different flotation needs of fine and coarse particles have long been recognised, for example, in the old design for separate 'sand and slimes' circuits. Yet the principles may be overlooked in the desire for simpler circuits and larger equipment. Most plants now treat all particles together in one wide size distribution. Reagent conditions are set for the dominant coarser particles, so fines are starved of collector. Worse still, if there are significant mid sized composites, they often have to be rejected in cleaning to achieve target concentrate grade. Yet the conditions which reject mid size composites (collector starvation and high depressants) also reject fine liberated par... |
| Databáze: | OpenAIRE |
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