| 添加絮凝药剂的尾矿砂浆充填材料的单轴抗压强度试验研究 |
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| 引用本文： | 吴文.添加絮凝药剂的尾矿砂浆充填材料的单轴抗压强度试验研究[J].岩土力学,2010,31(11):3367-3372. |
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| 作者姓名： | 吴文 |
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| 作者单位： | 中国科学院武汉岩土力学研究所,岩土力学与工程国家重点实验室,武汉430071;School of Engineering,Laurentian University,Sudbury,Ontario P3E 2C6 Canada |
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| 摘 要： | 尾矿充填主要包括3种类型:尾矿砂浆充填、尾矿糊状充填(pastefill)和废矿石充填(rockfill),其中前面两种充填属于水力充填,第3种属于干式充填。3种充填方法在加拿大的矿山都有应用。压缩强度和渗透性是水力充填材料的关键力学特性,直接影响井下充填的效果。一方面,为了使充填材料具有一定的强度,必须在尾矿砂浆(slurry backfill)材料中添加水泥,其用量非常大,水泥在充填成本中占有很大的比例。另一方面,尾矿砂浆水力充填是利用水力旋流器来分级固体颗粒,颗粒较细的部分将通过溢流派到废矿池中,颗粒较粗的部分回收利用作为井下充填的材料使用,有时充填的尾矿数量不够,需要另外购置砂子混合作为充填材料。如何减少水泥的使用量和从水力旋流器底流增加尾矿砂的细颗粒的固体部分产量,以达到节约充填成本的目的,一直是矿山企业所面临的重要课题。为此,专门研究絮凝药剂对尾矿砂浆充填材料的单轴抗压强度的影响。研究结果表明,絮凝药剂能够大幅度地提高尾矿砂浆充填材料的强度,而且絮凝药剂使用量有一个最优值,使强度达到最大。当过量使用絮凝药剂,尾矿砂浆充填材料的强度则有所降低。
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| 关 键 词： | 絮凝药剂 水力充填 尾矿 单轴抗压强度 |
| 收稿时间： | 2010-05-09 |
Investigation on uniaxial compressive strength of flocculated slurry backfill materials for minefill applications |
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| WU Wen.Investigation on uniaxial compressive strength of flocculated slurry backfill materials for minefill applications[J].Rock and Soil Mechanics,2010,31(11):3367-3372. |
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| Authors: | WU Wen |
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| Institution: | 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock & Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. School of Engineering, Laurentian University, Sudbury, Ontario P3E 2C6 Canada |
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| Abstract: | The purposes with regard to all underground voids filled with tailings are categorized into three aspects such as improvement safety issues (i.e. ground control), increasing economics (i.e. enhancing ore recovery rate), and environmental requirements (i.e. reduction acid water drainage). The types of backfill technologies include slurry backfill, paste fill and rockfill. The first two types of the backfill are also called as hydro-backfill, and rockfill is called as dried-backfill; all of which are applied to Canadian mines. UCS (uniaxial compressive strength) and permeability are critical parameters for slurry backfill in minefill applications, which affect on the quality of underground minefill. On the one hand, cement needs to be added into the slurry backfill materials to improve the strength of the fill materials; the huge tonnages of which are used for minefill and cement takes up the large component of mine fill costs; on the other hand, the coarse solid recovery used for backfill materials is classified from underflow of hydrocyclones, meanwhile fine parts flow out through overflow of the hydrocyclones to the tailings pool; sometime the backfill tailings of the mines are deficit and sand needs to be bought, which is mixed up with the tailings to be filled into the voids of underground. It is the concernful research issues for mine industry how to reduce the amount of cement added into backfill materials and improve the solid recovery particularly fine parts from underflow of the hydrocyclones in order to save the backfill costs. The effects of flocculant-assistance on UCS of tailings for slurry backfill are investigated. The results of the experiments indicate that the strength of tailings could be improved largely by the flocculant-assistance; moreover, the maximum strengths of backfill with flocculant-assistance are achieved at the optimization value of flocculant dosage, whereas the over-dosage of flocculant could have an adverse effect. |
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| Keywords: | flocculant slurry backfill tailings uniaxial compressive strength |
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