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| Bond Work Index× | Rosin-Rammler-fordelingen× | Vaskbarhedsanalyse× | |
|---|---|---|---|
| Fagområde | Minedrift | Minedrift | Minedrift |
| Familie | Process / pipeline | Process / pipeline | Process / pipeline |
| Oprindelsesår≠ | 1952 | 1933 | 1950 |
| Ophavsperson≠ | Fred C. Bond | Paul Rosin and Erich Rammler | Mining Industry Practice (1930s-1960s) |
| Type≠ | Empirical method for grinding energy estimation | Empirical probability distribution for crushed material fineness | Separation analysis by density fractionation |
| Oprindelig kilde≠ | Bond, F. C. (1952). The third theory of comminution. Transactions of the American Institute of Mining and Metallurgical Engineers, 193, 484-494. link ↗ | Rosin, P., & Rammler, E. (1933). The laws governing the fineness of powdered coal. Journal of the Institute of Fuel, 7, 29-36. link ↗ | McCullough, R. B. (1963). The theoretical basis and practical application of coal washability studies. Transactions of the Society of Mining Engineers, 226, 13-26. link ↗ |
| Aliasser | Bond Work Index, BWI, Bond Index Test | Rosin-Rammler Model, RRS Distribution, Weibull Distribution (particle size) | Coal Washability, Density Separation Analysis, Float-Sink Analysis |
| Relaterede | 3 | 3 | 3 |
| Resumé≠ | The Bond Work Index, introduced by Fred C. Bond in 1952, is an empirical parameter that characterizes the resistance of an ore to grinding in a tumbling mill. It is defined as the kilowatt-hours per short ton (kWh/st) of electrical energy required to reduce a coarse ore from theoretically infinite size to 80% passing 100 micrometers. The Bond Index is foundational in mineral processing plant design and cost estimation worldwide. | The Rosin-Rammler Distribution, introduced by Paul Rosin and Erich Rammler in 1933, is an empirical probability distribution that describes the particle size distribution of ground or crushed materials. It characterizes fineness by two parameters: the characteristic size (d-prime) and the uniformity index (n). This distribution is remarkably accurate for mineral processing streams and is ubiquitous in comminution engineering. | Washability analysis is a laboratory method that determines the feasibility and efficiency of density-based separation for coal or mineral beneficiation. By fractionating ore or coal into density bins using sink-float tests and assaying each fraction, engineers can optimize design of separation plants (dense-medium cyclones, jigs, spirals) and predict clean product quality. Washability curves are essential tools for pre-feasibility and detailed design studies. |
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