Chinese National Engineering Research Center for Coal Preparation and Purification, China University of Mining and Technology, 221116 Xuzhou, China; School of Chemical Engineering and Technology, China University of Mining and Technology, 221116 Xuzhou, China.
Chinese National Engineering Research Center for Coal Preparation and Purification, China University of Mining and Technology, 221116 Xuzhou, China.
Waste Manag. 2019 Feb 15;85:490-497. doi: 10.1016/j.wasman.2019.01.017. Epub 2019 Jan 19.
The effect of particle size on the flotation behavior of coal fly ash was investigated in this study. Three narrow particle size fractions, -125 + 74 μm, -74 + 45 μm, and -45 μm, and the unclassified particle size fraction of -500 μm of coal fly ash were chosen to study the basic properties by the measurement of induction time, contact angle, and wetting heat. Furthermore, flotation kinetic tests of coal fly ash with different particle size fractions were conducted. The results show that particle size significantly affects the flotation kinetics of coal fly ash, and the intermediate particle size fractions of -125 + 74 μm and -74 + 45 μm had better flotation performance and higher flotation rate than the fine particle size of -45 μm. Six flotation kinetic models were used to fit the test data of the cumulative unburned carbon recovery in the coal fly ash flotation. The parameters of flotation rate (k), maximum unburned carbon recovery (ε), and correlation coefficient (R) were analyzed in detail. The fitted results from the data showed that, for each size fraction, the froth flotation of coal fly ash can be best described by the classical first-order model.
本研究考察了粒径对粉煤灰浮选行为的影响。选择了三个窄粒径级分，-125+74μm、-74+45μm 和-45μm，以及未分类的粒径级分-500μm 的粉煤灰，通过诱导时间、接触角和润湿热的测量来研究其基本性质。此外，还进行了不同粒径级分粉煤灰的浮选动力学试验。结果表明，粒径对粉煤灰的浮选动力学有显著影响，-125+74μm 和-74+45μm 这两个中等粒径级分的浮选性能优于-45μm 的细颗粒级分，具有更高的浮选速率。使用了六个浮选动力学模型来拟合粉煤灰浮选过程中未燃碳回收率的累积数据。详细分析了浮选速率(k)、最大未燃碳回收率(ε)和相关系数(R)等参数。拟合结果表明，对于每个粒径级分，泡沫浮选过程可以用经典的一级模型来最好地描述。
