陶瓷介质搅拌磨对炼焦中煤解离特性与分选潜势的影响  

Effect of Ceramic Medium Stirred Mill on Dissociation Characteristics and Separating Potential of Coking Coal Middlings

作　　者：郭克奇 寇宗洋 郭旺 李永改[2] 邢耀文[1] 桂夏辉[1] GUO Keqi;KOU Zongyang;GUO Wang;LI Yonggai;XING Yaowen;GUI Xiahui(State key Laboratory of Coking Coal Resources Green Exploitation,China University of Mining and Technology,Xuzhou 221116,China;School of Chemical Engineering&Technology,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学炼焦煤资源绿色开发全国重点实验室,江苏徐州221116 [2]中国矿业大学化工学院,江苏徐州221116

出　　处：《金属矿山》2024年第4期111-120,共10页Metal Mine

基　　金：国家重点研发计划青年科学家项目(编号:2021YFC2900800);国家自然科学基金项目(编号:52204293);中国矿业大学2023年研究生创新计划项目(编号:2023WLJCRCZL091)。

摘　　要：为研究炼焦中煤在搅拌磨机中的选择性解离特性,以涡北选煤厂的炼焦中煤为对象,进行了样品性质、磨矿条件优化、磨矿产品解离特性及颗粒形状特性等研究,对比了相同磨矿细度下搅拌磨机和棒磨机磨矿产品的浮选效果。研究结果表明:在搅拌磨机磨矿时间4min、陶瓷球直径6mm、介质填充率60%、磨矿浓度55%的最优磨矿条件下,-0.074mm含量79.39%的磨矿产品经过浮选,可得到产率61.49%的精煤(A_(d)=11.50%)产品;在相同的磨矿细度下,搅拌磨机所需的磨矿时间更短,产生的高灰细泥产率低,磨矿产品浮选精煤(A_(d)=11.50%)产率较棒磨机高9.82个百分点,说明搅拌磨机解离效果更好;SEM分析进一步证实,搅拌磨机磨矿产品表面微细粒脉石矿物较少,颗粒球形度(R0)低,伸长率(EW)高,有利于颗粒与气泡的黏附;研究结果可为炼焦中煤选择性解离提供工艺思路。In order to study the selective dissociation characteristics of coking coal middlings in stirred mill,taking the coking coal middlings of Guobei Coal Preparation Plant as the object,the sample properties,grinding conditions optimization,dissociation characteristics of grinding products and particle shape characteristics were studied.The flotation effects of grinding products of stirred mill and rod mill under the same grinding fineness were compared.The results showed that under the optimal grinding conditions of stirred mill grinding time of 4 min,ceramic ball diameter of 6 mm,medium filling rate of 60%and grind-ing concentration of 55%,the grinding products with-0.074 mm content of 79.39%were floated,the concentrated coal(A_(d)=11.50%)products with yield of 61.49%were obtained.At the same grinding fineness,the grinding time required by the stirred mill was shorter,and the yield of high-ash fine mud was lower.The yield of flotation concentrated coal(A_(d)=11.50%)of the grinding products was 9.82 percentage points higher than that of the rod mill,indicating that the stirred mill had a better dissociation effect.SEM analysis further confirmed that there were less micro-fine gangue minerals on the surface of the stirred mill grinding products,the particle sphericity(R0)was low,and the elongation(EW)was high,which was conducive to the adhesion of particles and bubbles.The research results can provide process ideas for selective dissociation of coking coal mid-dlings.

关 键 词：炼焦中煤 磨矿条件优化 解离特性 颗粒形状系数 浮选 

分 类 号：TD94[矿业工程—选矿]