Flotation Behavior And Adsorption Mechanism Of Hematite Flocs In Sodium Oleate System

In the flocculation flotation process,the flotation parameters and the mechanism of the flocculant both directly affect the flotation effect.Sodium oleate,as a commonly used fatty acid collector,has a good harvesting effect on hematite.The flotation behavior and adsorption mechanism of hematite floc in the sodium system are of great significance to improve its application performance.According to the flotation conditions of flocculation,it can be seen that the floc recovery rate can reached 92.00% under the conditions of p H of 8,sodium oleate concentration 125mg/L,pulp concentration 10%,bubble size 1.0mm,and stirring speed 1800r/min.The response surface method was used to optimize the test results and multivariate quadratic equation was established for the effect of sodium oleate amount,p H and stirring speed and the interaction between the factors on the floc recovery rate.The ANOVA analysis and demonstration of the test results showed that the flocs were recovered well,which was consistent with the actual flotation effect.Based on the flocculation flotation conditions test,chemical and thermodynamic analysis,adsorption analysis,contact angle analysis,and infrared analysis of the flotation solution show that the ion-molecular association of sodium oleate is the main solution component of bulk flotation that causes flotation of flocculation.The order of floc adsorption capacity under different p H conditions was p H=8>p H=4>p H=12.At p H of 4,the adsorption of sodium oleate by flocs was single-layer adsorption,and it was multilayer adsorption at p H of 12.Infrared spectroscopy analysis before and after the action of sodium oleate and flocculent showed that sodium oleate chemically adsorbed on the surface of the floc at p H of 4 and 12,respectively.This kind of chemisorption under weakly acidic conditions was significantly greater than alkaline.The results of molecular dynamics simulations show that the adsorption of oleate on the floc surface is due to the chemical interaction of-COO.The adsorption performance is the largest,so the flotation effect is the best,the adsorption performance in the weak acid environment is the second,and the adsorption performance in the strong alkali environment is the worst.Through the condition test and mechanism analysis,the optimal flotation conditions and adsorption rules of fine-grained hematite floes were obtained,which provided theoretical support for guiding practical production applications.Figure42;Table15;Reference67...