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有色金属工程:2019,9(10):-
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全尾砂压密区孔隙结构几何特征及剪切演化规律
焦华喆, 王树飞, 陈新明, 陈峰宾, 杨亦轩
(河南省高等学校深部矿井建设重点学科开放实验室)
Geometric characteristics and shear evolution law of pore structure in compaction zone of unclassified-tailings
JIAO Huazhe, WANG Shufei, CHEN Xinming, CHEN Fengbin, YANG Yixuan
(Key Discipline Open Laboratory,Henan Province Colleges and Universities Deep Mine Construction)
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投稿时间:2018-07-06    修订日期:2018-07-25
中文摘要: 压密区孔隙结构是影响全尾砂重力浓密底流浓度的关键因素,对其几何特征的定量研究鲜见。借助CT断层扫描与三维重构技术获取孔隙的原位形态与分布,分析孔隙率、Feret直径以及孔隙圆度等关键参数的变化特点,揭示剪切作用对高浓度床层全尾砂孔隙结构的演化规律。结果表明,添加2rpm 的剪切作用使尾砂床层的孔隙率下降13.43%,但平均孔隙数量变化不明显;有/无剪切作用下的孔隙在Feret直径0-20μm范围分布较多,达到30.67%和46.07%。剪切作用将孔隙圆度在0.9-1范围降低9.86%,但孔隙延伸度和扁平度的变化不大;孔隙在凹凸度0.45-0.5和0.95-1.0范围降低了14.45%。因此剪切作用可以降低尾砂压缩床层的孔隙率,减少孔隙在0-20μm范围内的数量,但对孔隙平均数量影响不大。剪切作用可以减少孔隙在圆度0.9-1范围的数量,对延伸度和扁平度无明显影响,对凹凸度在0.45-0.5和0.9-1范围的影响较大。
Abstract:The pore structure of the thickening compaction region are the key factors affecting the underflow concentration of gravity thickening, the quantitative study of its geometric characteristics is rare. The morphology and distribution of pores under shear action are obtained by means of CT tomography and 3D reconstruction technology, analysis the change characteristics of porosity, Feret diameter, pore circularity and so on, reveal the evolution law of the shear action on the pore structure of the high concentration bed of unclassified-tailings. The results show the porosity under the 2rpm shear action decrease by 13.43%, but the change of average number of pores is not obvious; the pores is mainly concentrated at 0-20 μm of Feret diameter with/without shear action, occupying 30.67% and 46.07%. The shear action reduces the pore circularity by 9.86% in the 0.9-1 range, but the changes in the aspect ratio and flatness are not obvious; the pore number decreased by 14.45% in the range of roundness in 0.45-0.5 and 0.95-1.0. Therefore, the shearing action can reduce the porosity of the tailings compacted bed and decrease the number of pore Feret diameters in the 0-20 μm, but it has little effect on the average number of pores; shear action can reduce the number of pore circularity in the region of 0.9-1, but there is no obvious effect on aspect ratio and flatness, it has great influence in the roundness of 0.45-0.5 and 0.9-1.
文章编号:     中图分类号:TD853;TD862    文献标志码:
基金项目:国家自然科学基金资助项目(51574013; 51704094);国家安全生产重大事故防治关键技术项目(henan-0005-2016AQ)
引用文本:
焦华喆,王树飞,陈新明,陈峰宾,杨亦轩.全尾砂压密区孔隙结构几何特征及剪切演化规律[J].有色金属工程,2019,9(10):.

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