Research on Effect of Ultrasonic Pretreatment of Coal Slurry on Inorganic Minerals Flotation Recovery Rate
In order to eliminate the pollution caused by inorganic minerals to clean coal in the process of slime flotation,Xiqu 9#coking coal was selected as the test object to study the influence of ultrasonic pretreatment on the recovery rate of inorganic minerals in the process of slime flotation.The results show that the main inorganic mineral components contained in Xiqu 9#coking coal are kaolinite,calcite,quartz and pyrite.After pretreatment with different ultrasonic intensities and ultrasonic times,the diffraction peaks of calcite in coal slime basically disappear and combustibles are recovered.The flotation recovery rate of kaolinite after ultrasonic pretreatment of coal slurry with an intensityof87.5 Wand an action time of 15 min is28.54%,while the recoveryrate of kaolinite flotation is 28.54%without ultrasonic pretreatment of 31.67%.The recovery rate of calcite flotation of coal slurry after ultrasonic treatment with intensity of 112.5 Wand action time of 10 min was 1.41%,while the recovery rate of calcite flotation without ultrasonic pretreatment was 1.59%.After ultrasonic pretreatment,the recovery rate of quartz flotation becomes smaller than that when untreated,while the recovery rate of pyrite after ultrasonic pretreatment becomes larger than that when untreated.
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