基于Design Expert的煤系高岭土离心增白试验  

Experimental study on centrifugal separation and calcinationof coal-derived kaolin by Design Expert

作　　者：杜鹏涛 赵世永[1] 梁效 DU Pengtao;ZHAO Shiyong;LIANG Xiao(School of Chemistry and Chemical Engineering,Xi′an University of Science and Technology,Xi′an 710000,China;Xi′an Northwest Research Institute of Non-ferrous Geology Co.,Ltd.,Xi′an 710000,China)

机构地区：[1]西安科技大学化学与化工学院,陕西西安710000 [2]西安西北有色地质研究院有限公司,陕西西安710000

出　　处：《洁净煤技术》2023年第5期124-132,共9页Clean Coal Technology

基　　金：陕西省教育厅服务地方专项计划资助项目(16JF018);陕西省自然科学基础研究计划资助项目(2019JLM-12)。

摘　　要：黑岱沟矿区矸石的高岭土质量分数高达70%。从煤系资源综合利用的角度出发,利用离心选矿法脱除以铁钛类为主的高密度致色杂质,提高煤系高岭土的煅烧白度。采用Design Expert进行四因素三水平的Box-Behnken正交试验设计;探究离心转速、入料速度、入料浓度和入料时间对煅烧白度及精矿产率的影响,拟合二次方程关系模型;给出煅烧白度及精矿产率与显著因素之间的响应曲面图,发现煅烧白度主要受离心转速影响,随离心转速的增加,煅烧白度先升高后降低,而精矿产率主要受入料时间影响,随入料时间的延长,精矿产率线性增加;最终结合Design Expert模拟结果,探究最佳离心增白试验条件,即离心转速为800 r/min,入料速度为8.4 L/min,入料浓度20%,入料时间100 s时,得到最佳高岭土煅烧白度(78.80%)和精矿产率(86.31%)。The kaolin content of gangue in the Heidaigou ming area is as high as 70%.Herein,from the perspective of comprehensive utilization of coal resources,in order to improve the calcination whiteness of coal-derived kaolin,a method of centrifugal for separation was used to remove the chromogenic impurities with high-density.To achieve this,this work performed orthogonal design by Design Expert and adopted the Box-Behnken model.Consequently,the influence of centrifugal speed,feeding rate,feeding concentration and feeding time on the calcination whiteness and concentrate yield was explored and the quadratic equation relationship model was fitted.Further,the response surface plots of calcination whiteness and concentrate yield with significant factors were given.It was found that the whiteness of calcination was mainly affected by the centrifugal speed.With the increase of the rotation speed of the drum,the whiteness of the calcination first increased and then decreased.The yield of concentrate was mainly affected by the feeding time.With the extension of feeding time,the yield of concentrate increased linearly.Finally,combined with the simulation results of Design Expert,the optimal centrifugal separation conditions were analyzed and explored.When the centrifugal speed is 800 r/min,feeding rate is 8.4 L/min,feeding concentration is 20%,and feeding time is 100 s,the optimal calcination whiteness(78.80%)and concentrate yield(86.31%)of kaolin can be obtained.

关 键 词：Design Expert 煤系高岭土 提纯增白 离心分选 Soln离心机 

分 类 号：TD922[矿业工程—选矿]