The effect of jigging time and air cycle on bed stratification in a pilot scale Baum jig

Autor: Rui X. Rong, Lyman Geoffrey John
Rok vydání: 1992
Předmět:
Zdroj: Fuel. 71:115-123
ISSN: 0016-2361
DOI: 10.1016/0016-2361(92)90201-x
Popis: A highly instrumented and controlled pilot jig was constructed to study water motion behaviour or oscillation with the object of optimizing bed stratification of coal washing jigs. Durable synthetic material, colour coded for density, was used as the bed material in a series of 114 experiments. The bed was fully analysed layer by layer for size and density distribution. It was found that jigging time is a very significant parameter affecting the bed stratification. In general, bed stratification improves quickly up to a jigging time of 180 s, and thereafter more slowly. When the jigging time exceeds 300 s, the bed is in a state of dynamic equilibrium for material coarser than 8 mm; however, the finer particles (< 8mm) need more time to achieve such a state. To improve the bed stratification, operating parameters should be adjusted to generate suitable air and water behaviour in the jig. A cycle with a long inlet period (199-220 °), which is seldom used at present, appears to provide such behaviour. Improvement of bed stratification by using an appropriate air cycle will increase the separation efficiency and yield of product in coal washing jigs.
Databáze: OpenAIRE
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