喷射-搅拌耦合式浮选装置吸气机理研究

根据喷射吸气和搅拌吸气的特点,设计一种喷射-搅拌耦合式浮选装置。为研究该装置的吸气方式,对其吸气机理进行理论分析,并采用控制循环泵电机输入频率以调节喷射流量及控制液位的方法,分别对浮选装置的耦合吸气量与喷射流量的关系以及搅拌吸气量与叶轮转速的关系进行了试验研究。结果表明:搅拌吸气量随叶轮转速的增大呈二次函数关系增加,耦合吸气量随喷射流量的增加呈近似线性递增;受叶轮旋转和液位的影响,浅液位(hy≤140 mm)时,耦合及搅拌吸气区共同吸气;深液位(hy140 mm)时,搅拌吸气量很小甚至为零,主要为耦合吸气区吸气;低喷射流量(电机频率小于35 Hz)时,耦合吸气量随液位的升高先增大后减小,高喷射流量(电机频率大于30 Hz)时,随液位的升高而增大;而搅拌吸气量随液位的升高均急剧减小。最大频率50 Hz、最深液位230 mm时的最大总吸气量约为4.03 L/min,基本满足浮选吸气要求。吸气机理的研究为该装置的进一步分选研究提供理论参考。

Air-suction mechanism of jet-stirring coupling flotation device

Based on the characteristics of spraying inspiration and stirring inspiration,a novel jet-stirring coupling flotation device was designed.In order to study its inspiration method,its air-suction mechanism was analyzed theoretically,and also the experimental investigation of the device on the relationship between coupling inspiratory capacity and jet flow and the relationship between stirring inspiratory capacity and impeller rotational speed was conducted by controlling the input frequency of circulating pump motor to adjust jet flow and control liquid level.The results show that the stirring inspiratory capacity increases in a quadratic function with the increase of impeller rotational speed,and the coupling inspiratory capacity increases in an approximate linear with the increase of jet flow;influenced by impeller rotation and liquid level,the coupling inspiratory region and stirring inspiratory region inhale air together under a shallow level (hy≤140 mm),and the coupling inspiratory region inhales air while the stirring inspiratory capacity is low or even zero under deep level (hy>140 mm);and the coupling inspiratory capacity increases first and then decreases with liquid level goes up at low jet flow (motor frequency is less than 35 Hz),and increases with the increase of liquid level at high jet flow (motor frequency is more than 30 Hz);however,the stirring inspiration capacity is sharply reduced with liquid level rising.The maximum total inspiratory capacity is about 4.03 L/min in the deepest liquid level 230 mm and the maximum frequency 50 Hz,and basically satisfies the requirement of air-suction for flotation.The study of air-suction mechanism provides a fundamental basis for a further separation study of the device.