Abstract
In the flotation process, gas-liquid properties and the bubble system greatly influence bubble mineralization. In order to clarify how the mechanism applies to the closure characteristics of an annular jet mixed flow zone on the inspiratory performance and the bubble system, different degrees of closure on the velocity field and gas-liquid ratio in the mixed flow zone were investigated using numerical simulation. The variations in the characteristics of bubble size distribution, rising velocity, and gas content under different closure levels were measured with a high-speed dynamic camera technology. The results confirmed that when the closure degrees of the mixed flow zone improved, the inlet jet could gradually overcome the static pressure outside the nozzle effectively. It formed a gas-liquid mixing zone with high turbulence first, and a large pressure difference at the gas-liquid junction second. This helped to increase the inspiratory capacity. At the same time, the gas-liquid ratio rose gradually under conditions of constant flow. When the nozzle outlet was completely closed, the gas-liquid ratio gradually stabilized. For the bubble distribution system, an enhancement in the closure degrees can effectively reduce the bubble size, and subsequently, the bubble size distribution became more uniform. Due to the improved gas-liquid shear mixing, the aspect ratio of the bubbles can be effectively changed, consequently reducing the bubble rising speed and increasing the gas content and bubble surface area flux of the liquid.
Highlights
In the flotation process, gas-liquid properties and the bubble system greatly influence bubble mineralization
Flotation process relies on the rising of a group of bubbles and the settlement of hydrophilic particles [8]
Because it is difficult to measure the bubble production process in the gas-liquid mixing state in the annular jet nozzle (8), the bubbles produced are released into the tank and measured
Summary
The inlet pressure P of the feed pipe can be adjusted by the diverter valve so that it stays at 0.10 MPa. The nozzle distance L can be adjusted by the metallic gasket and the adjustment range is 0–20 mm. The observation tank is made of highly transparent glass, The P inlet pressure. The observation tank is made oftank highly transparent glass, which is used for submerged jet and bubble collection. The inner surface of the steel tank as the standard for calibrating the bubble size. Captured andsample processed sample images(a) of Original bubbles.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
