Research Of Bubbles Mineralization Based On High-speed Dynamic Microscopic Test

The movement of mineral particles on the surface of bubble is one of the key factors in the bubble mineralization. This paper was based on high speed camera equipment, analyzed the particles-bubbles interaction from the microscopic point, researched the bubble mineralization regularity and the factors of bubble mineralization effect.To obtain controllable properties of particles,this paper modified the glass beads surface of-0.25+0.125 mm,-0.125+0.074 mm,-0.074+0.038 mm size, and got the glass beads of different size, different hydrophobicity.A single stationary bubble device has been builded, based on high-speed dynamic video and image processing techniques, movement speed variation of particles in the bubble surface with different particle size, different hydrophobicity and different particle shapes in different frother, collector, inorganic salt solution conditions has been researched. The results show that:(1) The particles do sliding motion on the bubble surface, the sliding velocity of particles will increase instantaneous because of the bubble breakup in the collision of particles and bubbles;(2) In the bubble surface, The average slip velocity of particles increases with increasing of particle collision angle on the bubble surface; particle sliding speed changes slowly when collision angle in the 30±5°degree range;(3) Under the conditions of different solution properties and different particle nature, the velocity of particle sliding in the bubble surface are different: a) Particles sliding velocity decreases with reduction of surface tension; b) but the laws are different when the Zeta potential of particles is changed; c) particle size and hydrophobicity have a significant effect on the sliding, larger particle size with greater slip speed, and stronger particle hydrophobic with smaller sliding speed; d) the effect of particle shape on the sliding velocity cannot be ignored, which be similar to the particle size and hydrophobic.To further explore the bubble-particle interaction, the floating bubbles device is constructed. The collision, adhesion and desorption process between glass beads and bubbles are recorded by high-speed dynamic video camera, the results show that the collision-adhesion-desorption mode and the probability are very different under different conditions. The collision areas on the bubble mainly locate on the upper half area of floating bubbles, namely the upper portion of the left and right sides of-90 ° to + 90 ° range on bubbles. With constant bubble size, the larger the particle size, the higher the collision probability between particles and bubbles. The different adhesion state with different particle size, the greater size of particle is more easily to slip to the bubble tail; The particle-bubble floating rules were explored by this device, combining particle sliding velocity law of single bubble static device testing which found it is not conducive for the mineralized bubbles to float up if the sliding velocity of particles on the surface of bubble is too fast or too slow.