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| Gas-solid two-phase flow simulation of waste printed circuit board powder pneumatic separation process and experiment |
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Abstract A method of separating metal powder and resin through pneumatic separation was presented according to the characteristics of waste printed circuit board powder. RNG k-ε model and unsteady tracking model were used respectively to simulate the gas flow field and the solid particles. Simulation results showed that the pneumatic separator cavity was in the whirlwind state. Wind pressure was increased with radius and height increasing, and reached the peak at the height of 1.2m. The printed circuit board powder pneumatic separation experiment was carried out and the optimal technological parameters which were chosen from the different particle sizes and impeller rotate speed were obtained. The results showed that particle fractions had the most important influence on separation effect, and the maximal metal recovery rate reached 96.5% when particle sizes were 0.125~0.212mm and the impeller speed was 200r/min. Finally, through the correlation analyzing of experiment and simulation results, the validity of the simulation was verified, and the separation scheme was proved to be feasible.
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Received: 17 March 2011
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