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A double cosine self-suction nozzle was designed based on the spraying inspiration. The influence of operating parameters on the bubble size distribution in a double cosine self-suction nozzle was analyzed using methyl isobutyl carbinol(MIBC) as the frother. Bubble Sauter mean diameter of nozzle was investigated at different concentrations of frother, inflow pressure, sampling height, nozzle distance, and the suction capacity of the nozzle was researched under different inflow pressures using the image analysis technique. The results show that with the increase of frother concentration, the Sauter mean diameter(d32) decreases until the critical coalescence concentration(CCC) was determined as 0.112 mmol/L above which the d32 is constant. With a higher inflow pressure, the constant is lower and the scope of bubble size distribution becomes narrow with the increases of the smaller bubble content. For example, the Sauter mean diameter was 0.32 mm and the content of bubble middle size distribution was 40.73% when the inflow pressure P is 0.14 MPa. The d32 decreases with the increase of inflow pressure, nozzle distance and sampling height. The decrease(increase) tread changes slower when the frother concentration reaches the CCC. With the inflow pressure the inspiratory capacity increases linearly, and the inspiratory capacity is larger when the nozzle distance increases. [ABSTRACT FROM AUTHOR]

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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. [ABSTRACT FROM AUTHOR]