Research Of Flotation Process Of High Fine Difficult Floated Coal Slime

With the continuous mechanization of mining technology and the depletion of high-quality coal,there have been a large number of high-ash fine-grained slime.Flotation is one of the most effective methods for treating high-ash fine-grained slime.In the traditional flotation process,the traditional hydrocarbon collector was in the capture of coal particles,at the same time will carry a large number of veins stone minerals,which result in a large number of fine mud entrainment and the problem of poor selectivity.At the same time,because the surface of coal particles contain oxygen-containing functional groups and have poor hydrophobicity,the traditional hydrocarbon collector is difficult to capture coal particles,so there will be have a problem of poor collection.The addition of an appropriate amount of surfactant to the collector can improve the flotation effect and achieve efficient separation of coal particles and gangue minerals.How to find a right surfactant is a major problem in the flotation process.In this paper,flotation was studied by using polyoxyethylene ether type and alkanolamide type nonionic surfactant,which in combination with kerosene and the formation of emulsion instead of simple use of kerosene,that aims atexploreing its role in promoting the flotation of coal.During the experiment,the flotation effect of different types of collector on the slime was evaluated by flotation experiment,and the influence on the flotation was investigated.In addition,the effect of different speed and different mixing time on flotation was compared by high shear pretreatment technique.In contrast to conventional flotation,the effect of high shear dressing on flotation was analyzed.The synergistic mechanism of the collector after emulsification was studied by infrared spectroscopy.The contents of the experiment and the conclusions are as follows:1.Experimental flotation experiments were carried out on the experimental coal samples with the traditional hydrocarbon collector kerosene.The effects of the amount of collector,the amount of foaming agent and the concentration of pulp on flotation were studied.The optimum flotation conditions were as follows: the dosage of kerosene was 12 kg / t,the dosage of bubble was 500 g / t and the pulp concentration was 80 g / L.2.Three type of nonionic surfactant were combined with kerosene in different proportions.The results show that after the complex,to achieve a similar flotation effect,the consumption of complex type of collector used alone is only 1/3 of kerosene alone.At the same ratio,the amount of collector increased,which caused the yield of clean coal,the coal ash and the recovery of combustible body increased.Finally the optimal ratio of surfactant and kerosene in compound type collector was 1:10.3.AEO9,NP10 and ODEA were used to prepare three kinds of nonionic surfactants,that water and kerosene were in a certain proportion.The results show that emulsion can be used as a collector to improve the flotation index.After emulsification,kerosene became smaller granularity,more uniform dispersion in the pulp,and more easily attached to the surface of coal particles to improve the floating rate of coal.AEO9 and ODEA mixed emulsions have synergistic effect on coal samples.The mixing of the two can increase the micelle concentration in the emulsion and improve the properties of the emulsions,so as to improve the trapping of coal flotation.4.The results show that the application of high shear conditions has a certain effect on the flotation of coal slime.By infrared spectroscopy,the intensity of the characteristic peaks of the oxygen-containing functional groups and the hydrocarbon groups is: emulsion>kerosene,in other words,the intensity of the emulsions and slime is greater than that of kerosene.