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利用摇动作用以强化矿泥的分选是近年来重选设备研制的一个重要方向。本文深入分析了液流在摇动溜槽中的运动规律;阐明一个摇动周期的不同时间中液流的流速分布特性;找出摇动所引起的摆动水流的剪切率与摇动参数的关系。并进一步利用作简谐运动的实验室摇动溜槽进行细粒人工混合矿的分选试验,以验证分选效率与冲程冲次的关系和揭示轻重矿粒在精矿和尾矿中按粒度分布的规律。试验结果与理论分析相符,并发现矿泥摇动溜槽中特有的轻矿粒按反分级分层,重矿粒按正分级分层的现象。最后运用作者修正的拜格诺剪切分散压公式计算了摇动溜槽中的矿浆分散压,证实了拜格诺的剪切松散理论完全适用于摇动溜槽,附加摇动作用在分选过程中起主导作用。
The use of shaking to strengthen the separation of slime in recent years re-election equipment developed an important direction. In this paper, the movement law of the liquid flow in the shaking chute is analyzed in depth. The flow velocity distribution of the liquid flow at different time of one shaking cycle is clarified. The relationship between the shear rate and the shaking parameter of the oscillating water flow is found out. And further utilize the laboratory shaking chute for simple harmonic motion to carry out the sorting test of the fine-grained artificial mixed ore to verify the relationship between the separation efficiency and the stroke-stroke and to reveal the distribution of light and heavy mineral particles in the concentrate and tailings law. The experimental results are consistent with the theoretical analysis. It is found that the light mineral particles in the slime shaking tank are stratified by anti-classification and the heavy mineral particles are stratified by positive classification. Finally, using the modified Bayonau shear dispersion pressure formula modified by the author, the slurry dispersion pressure in the shaking chute is calculated, confirming that the Bayono theory of shearing looseness is completely suitable for shaking the chute. The additional shaking plays a leading role in the sorting process .