Research On The Effects Of Hydrodynamic Cavitation On Flotation Bubbles And Flotation Froth Stability

To reduce the bubble size is one of the main methods to improve the recovery of fine particle flotation, and hydrodynamic cavitation can generate numerous micro bubbles. Surrounding "hydrodynamic cavitation", flotation froth system under the effect of hydrodynamic cavitation are selected as study objects. In this study, cavitation tube is used as cavitation generator, and a bubble detector equipped with a circulation device of hydrodynamic cativation and a circulation device of hydrodynamic cativation are designed. The objective of this research is to analyze the effects of hydrodynamic cavitation on flotation froth layer and optimize the hydrodynamic cavitation conditions of cavitation aid flotation process by understanding the formation and influential factors of cavitaion bubbles. In gas-liquid system, effects of hydrodynamic cavitation on the formation of micro bubbles and gas-liquid froth layer stability have been discussed. In addition, in gas-liquid-solid system, effects of hydrodynamic cavitation on three phase froth layer and recovery of zinc oxide have been studied.The main conclusions are as follows:1. Two phase system(1)Hydrodynamic cavitation will help improve the gas-liquid two phase balance foam layer height and the dynamic stability of the foam layer. Balance foam layer height and dynamic balance of foam stability with the condition of hydrodynamic cavitation were higher than it without the condition of hydrodynamic cavitation.(2)Hydrodynamic cavitation generated a lot of micro-bubbles. Increasing of concentration of MIBC and longer cavitation time were beneficial to formation cavitation micro bubbles. The increase of slurry flow rate and the decrease of test section diameter of the cavitation tube, which can reduce the cavitation number, was conducive to the occurrence of cavitation and the formation of micro bubbles. The decrease of diffusion section length and the increase of the test section length was not conducive to the occurrence of cavitation and the formation of tiny bubbles.2. Three phase system(3)Hydrodynamic cavitation will help improve the gas-liquid three phase balance foam layer height and the dynamic stability of the foam layer. The improvement of stability of three-phase foam layer is the result of joint action microgranular smithsonite cavitation and the microgranular smithsonite.(4) Zinc oxide ore flotation results show that hydrodynamic cavitation can increase flotation yield of fine zinc oxide minerals and the flotation rate. With the growth of cavitation time, zinc oxide flotation yield increased; with pulp shelf-time growth, flotation yield decreased. It is conducive to the occurrence of cavitation and the increase of flotation yield that the increase of slurry flow rate,the decrease of the test section tube length, the decrease of the cavitation test section tube diameter, the increase of cavitation tube diffusion section length and inflatable cavitation. In general, the greater the number of cavitation bubbles generated by hydrodynamic cavitation, the smaller the bubbles size, the better the recovery of fine zinc oxide flotation.(5) Optimal condition of cavitation-floatation is collector oleic acid166g/t, grinding time10min, cavitation test section tube length of5mm, diffusion length to50mm, test section4.5mm in diameter, cavitation time3min, slurry flow rate246.38ml/s, pulp aside time to0. Under the circumstances, we could acquire30.84%the yield of zinc oxide mineral, increased by16.6%than when there is no cavitation.44figures,6tables,63references are included.