Study On Foaming Performance Of Combined Micro Bubble Generator

Micro bubble generator is the most important part of the flotation equipment. Its performance directly affects the effect of mineral flotation separation. Under the certain inflation conditions, bubble uniformity, small size and large bubble volume proportion is an important index to evaluate the performance of micro bubble generator. High quality of the micro bubble generator has been the focus of the study of flotation technology.Firstly, the development of flotation column and micro bubble generator is discussed in this paper, and the working principle, advantages and disadvantages of several typical flotation column and micro bubble generator at home and abroad are discussed. The formation mechanism of micro bubbles, the working principle, structure and function of the jet and swirl micro bubble generator were described. The factors affecting the foaming performance of the micro bubble generator were discussed. The VOF multiphase flow model of swirl jet micro bubble generator, micro bubble generator and the combination of micro bubble generator during the suction process was simulated using Reynolds stress turbulence model to simulate the internal flow field of swirl micro bubble generator. Using the standard turbulence model of jet micro bubble generator internal flow field simulation of the the internal flow field of micro bubble generator of two phase flow numerical simulation of the fluid dynamics software FLUENT, the pressure and the micro bubble generator phase internal flow field distribution were obtained, and the influence of speed, inlet size, underflow size and other parameters of fluid into the micro bubble generator foaming performance is carried out. According to the boundary conditions for simulation to build the micro bubble generator test platform, the inlet velocity experiment, the size of an air inlet and bottom outlet size experiment is carried out.Through simulation and experiment, it is concluded that the larger the flow rate, the smaller the bubble size is, the more uniform the bubble is, the larger the bubble volume is. The design of the micro bubble generator inlet dimensions for 15 mm, the underflow orifice size for 10mm, air intake, produced by bubble size minimum amount of air bubbles.