The Experimental Research And Flow Field Analysis Of Fluidized Flotation Column For Coal Fine

The separation of slime has become the key point affecting the clean coal yield. Application of a great deal of dense-media cyclones of large diameter has improved the productivity, and also increased the slime content and complicated coal processing technology. For the coal separation without one directly using sophisticated equipment, the process for cleaning classified feed is general in Coal Preparation Plant. While Fluidized Flotation Column can realize the slime mixed selection. And the mechanism of separation is to introduce a rising water to extend the upper limit of the flotation column. The Fluidized Flotation" Column researched and exploited on this mechanism is a very simple and efficient processing equipment, additionally its research is only at the beginning all of world. For our country, it is very significant to the development of coal cleaning technology and the simplification of the slime separation process by launching this type of fluidized-bed Flotation Column.This paper are designing a new fluidized-bed flotation column which combines the advantages of the column with the teetering-bed separator and utilizes the up flow air bubbles concept. There are four stages, such as the initial conception, numerical simulation, design of the laboratory model machine, laboratory tests and hydrodynamics sorting mechanism. We have conducted the sorting tests which had usee the different proportion of coarse slime samples from Abram and Dongqu. And the yield of the Abram sample plant concentrate could reach82.79%, with12.20%ash; the Dongqu was64.88%, with11.14%ash. The results show that the Fluidized Flotation Column has reached its assumption of early design and can realize slime mixed selecting without grading basically, while it is also showing that some of the structure parameters of the column needs further optimized. At the same time for the separation of the mechanism of study which assumed bubble and particle as a whole concludes calculation formulas of the last free floating rate and the last speed of the interference floating of the bubble-particle acceptors, and there is analysising the influences of the separation index on particle density, particle size and concentration.The research indicates that the technology of fluidized bed flotation has great meaning in solving the problem of coal separation, realizing mix flotation of coals,and simplifying the process flow of coals in coal preparation plant. A new separating theory of rising bubble has been proved to be of great meaning on solving the problem of coal separation through test and theoretical analysis.