低阶煤可浮性及浮选速率模型研究

针对低阶煤浮选困难的问题,采用煤质分析和筛分试验研究了低阶煤的可浮性。在此基础上进行了低阶煤浮选速度试验,并利用试验结果对低阶煤的浮选速率模型进行曲线拟合,经过MATLAB数值计算建立了最终的浮选速率模型。煤泥可浮性试验表明:低阶煤中挥发分、水分和O含量较高,亲水性强,可浮性很差。浮选速度试验表明,随着浮选时间的增加,精煤产率逐渐升高,尾煤产率逐渐降低,当精煤灰分为11.50%时,精煤产率仅为34.46%,尾煤产率高达65.54%,尾煤灰分仅为19.95%;2种浮选速率模型中,一级矩形分布模型计算误差较小,且相关系数平方R2更接近1,达到了很高的拟合精度,因此一级矩形分布模型是低阶煤最合适的浮选速率模型。

Research on floatability and flotation rate model of low-rank coal

In view of the difficulty in low-rank coal flotation,the coal quality analysis and screening tests were applied to research the floatability of low-rank coal.This research provides a basis for subsequent tests.A flotation speed test was carried out and the flotation rate model was proposed with experimental data curve fitting by MATLAB.The floatability analysis results show that there are numerous volatile,moisture and oxygen in low-rank coal with strong hydrophilicity and poor floatability.In the flotation speed test,the clean coal yield gradually increases but the tailing yield reduces little by little with the increase of flotation time.When the clean coal yield is 34.46% with 11.5% ash content,the tailing yield is up to 65.54% with only 19.95% ash content.In two flotation rate models,the first-order rectangular distribution model has smaller calculation relative error and the squared correlation coefficient is closer to 1,which achieved a high fitting precision.Therefore,the first-order rectangular distribution model is the most appropriate flotation rate model of low-rank coal.