The commonly used foaming agent is the surface active substance of heteropolar, the one end of the molecule is non-polar hydrocarbon, and the other end is the polar base of hydrophilic.
The molecules of the foaming agent in the pulp are attached to the gas-liquid interface by an irregular orientation, and the non-polar base is pointing towards the air, which is the inside of the bubble. The polarity is oriented towards the water and attracts water molecules (the polarity is hydrated). So the foaming agent can reduce the flow rate and evaporation rate of the barrier layer, thus preventing the rupture of the bubble wall.
Frother molecular orientational alignment in the bubble surface, when two bubbles contact collision, cushion between two layer foaming agent molecules and their polarity based hydration layer, thus acquire bubble is more difficult, the tiny bubbles easily preserved, and the tiny bubbles can withstand the vibration of the external force, more than the big bubble stronger its stability.
The other main reason for bubbles to stabilize bubbles is that they make the bubble surface elastic, just like a rubber film with elasticity. When the bubble is vibrating or is acted on by a force, the bubbles suddenly become deformed. If the bubble surface does not have a foaming agent, it will make the wall of the bubble thin to rupture. Bubbles with foaming agent molecules on the surface, however, because of the frother molecular orientational reduces the surface tension, bubble deformation, external force by a bubble wall interface also increase, will cause the bubble surface bubble agent molecule concentration is reduced, and the surface tension of the gas-liquid interface is significantly increased, the increase of the surface tension on the one hand is advantageous to the constraint of molecular gas inside the bubble to rush out, on the other hand make bubble generate large force, overcome the force of air bubbles fracture.
The size of the bubble due to the molecules of the foaming agent is determined by the activity, solubility and concentration of the foaming agent. When the concentration of solution concentration and gas-liquid interface due to interface to expand imbalance occurs, molecular adsorption from solution to interface too fast or too slow, can make the elasticity of the bubble. Therefore, the active and solubility of the foaming agent should be chosen, especially the dosage should be controlled appropriately.
From the above, the action of the foaming agent helps the bubbles to form and increase the stability of the foam. In the process of flotation, the bubbles form a mineralized bubble due to the attachment of the pellets to the bubbles. The three-phase bubbles formed by the mineralization of two phase bubbles are more stable. This is because the deposit has the following effect on the bubbles:
It can reduce the flow rate of the layer in the foam, because the pellets are adsorbed in the bubble forming the capillary.
The ore is adsorbed on the bubble wall, hindering the mutual merger of bubbles.
The interplay of the collecting agent on the surface of the ore can increase the mechanical strength of the bubble.
In addition, the stability of the foam is also related to other factors, and in general, the amount of mud in the mud will also make the foam more stable. In addition, the pH value of the pulp and the soluble salt content are also affected.
鲁ICP备14019848号-1 CopyRight © 2013-2016 Yantai billion thai chemical co.,ltd.All Rights Reserved Technical support:pintoo co.,ltd