高灰細(xì)粒難浮煤泥浮選工藝研究
[Abstract]:With the mechanization of mining technology and the depletion of high-quality coal, a large number of high-ash fine-grained coal slime has emerged. Flotation is one of the most effective methods to deal with high-ash fine-grained coal slime. In the traditional flotation process, traditional hydrocarbon collectors carry a large number of gangue minerals while collecting coal particles, resulting in a large number of fine slime entrainment. There is a problem of poor selectivity. At the same time, because of the oxygen-containing functional groups on the surface of coal particles and poor hydrophobicity, it is difficult for traditional hydrocarbon collectors to catch coal particles, so the problem of poor collector performance will also occur. Adding a proper amount of surfactant to the collector can improve the flotation effect and realize the high efficiency separation of coal particles and gangue minerals. How to find a suitable surfactant is a difficult problem in flotation process. In view of the difficult floating characteristics of fine coal slime with high ash, polyoxyethylene ether type and alkanolamide type Nonionic surfactants were mixed with kerosene, and emulsion was formed instead of flotation process using kerosene alone as collector. To explore its promoting effect on the flotation of coal slime. In the process of experiment, taking the slime of a coal preparation plant in Shendong as the research object, through the flotation experiment, the flotation effect of different types of collectors on the coal slime was evaluated, and its influence on the flotation was investigated. In addition, the effect of different rotation speed and different pulping time on flotation was compared with the pretreatment technology of high shear pulping. Compared with conventional flotation, the influence of high shear sizing on flotation is analyzed. Then the synergistic mechanism of emulsified collector was studied by infrared spectroscopy. The contents of the experiment and the conclusions obtained are as follows: 1. The unit flotation experiment of experimental coal samples was carried out with the traditional hydrocarbon collector kerosene. The effects of collector dosage, frother dosage and slurry concentration on flotation were studied. The optimum flotation conditions were determined as follows: the dosage of kerosene is 12 kg / t, the amount of foaming agent is 500 g / t, and the concentration of slurry is 80 g / L. Using fatty alcohol polyoxyethylene ether (AEO9), nonylphenol polyoxyethylene ether (NP10) and oleic acid diethanolamide (ODEA) as Nonionic surfactants and kerosene in different proportion, the complex collector was prepared, and then flotation experiment was carried out. The results show that in order to achieve similar flotation effect after blending, the amount of compound collector consumed is only 1 / 3 of kerosene used alone. Under the same ratio, the yield of refined coal, ash content and combustible recovery of tail coal increased with the increase of collector dosage. Finally, the optimum ratio of surfactant and kerosene was determined to be 1 / 10. 3. Stable emulsions were prepared by using fatty alcohol polyoxyethylene ether (AEO9), nonylphenol polyoxyethylene ether (NP10) and oleic acid diethanolamide (ODEA) as Nonionic surfactants, water and kerosene in a certain proportion. The experiment of flotation of experimental coal samples with emulsion was carried out to explore its promoting effect on flotation. The results show that the flotation index can be improved better by using emulsion as collector. After emulsified kerosene particle size became finer, dispersed more evenly in slurry, more easily attached to the surface of coal particle, and increased the floating rate of fine coal. AEO _ 9 and ODEA mixed emulsion had synergistic effect on coal sample, and the micelle concentration in emulsion could be increased by the mixture of AEO _ 9 and AEO _ 9. Improve the properties of emulsion so as to improve the collector of slime flotation. 4. The pretreatment of coal slime by high shear mixing technology is compared with that of conventional flotation. The results show that the application of high shear condition technology can promote the flotation of coal slime to a certain extent. The infrared spectra show that the intensity changes of the characteristic peaks of oxygen-containing functional groups and hydrocarbon groups are as follows: emulsified kerosene, that is, the interaction strength between emulsion and kerosene is greater than that of kerosene.
【學(xué)位授予單位】:太原理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TD94;TD923
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