| 全尾砂无耙深锥稳态浓密性能分析 |
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| 作者姓名： | 李公成 王洪江 吴爱祥 焦华喆 王方正 |
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| 作者单位： | 北京科技大学土木与资源工程学院,北京,100083;河南理工大学土木与环境工程学院,焦作,454150 |
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| 基金项目： | 国家十三五重点研发计划课题资助项目2017YFC0602903国家自然科学基金资助项目51374034国家自然科学基金资助项目51304011北京市科技计划资助项目Z161100001216002 |
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| 摘 要： | 结合沉降和压滤实验, 对脱水性能数据进行曲线拟合获得连续网状结构形成浓度、压缩屈服应力和干涉沉降系数, 引入Usher提出的稳态浓密性能预测算法, 建立了无耙深锥浓密模型, 分析了絮凝剂单耗、底流中固相的体积分数、泥层高度等对固体通量和固体处理能力的影响规律.研究结果表明: 絮凝剂添加量对沉降区域影响大于压密区域, 20 g·t-1时浓密性能较好, 底流中固相的体积分数越大固体通量越小; 在沉降区域, 固体通量仅与浓度有关, 不受泥层高度影响; 在压密区域, 固体通量为浓度与泥层高度的方程; 模型参数范围内, 当泥层高度 < 3.5 m时, 固体处理能力为浓度与泥层高度的方程, 当泥层高度>3.5 m时, 固体处理能力与固体通量随底流中固相的体积分数变化规律一致.
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| 关 键 词： | 无耙深锥浓密机 絮凝剂单耗 泥层高度 底流中固相的体积分数 固体通量 固体处理能力 |
| 收稿时间： | 2018-03-20 |
Analysis of thickening performance of unclassified tailings in rakeless deep cone thickener |
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| Affiliation: | 1.School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China2.School of Civil and Environment Engineering, Henan Polytechnic University, Jiaozuo 454150, China |
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| Abstract: | Typical tailings discharge at low solids concentrations can cause serious environmental pollution and disasters, including tailings dam failures and the collapse of underground voids. High-density cemented backfill, which consists of unclassified mine tailings, binders, additive agents, and water, are increasingly being considered as simple and effective means for reducing the hazards of conventional slurry deposition and recovering water for recycling. Gravity thickening has been widely used in the minerals industry to increase solids concentrations of tailings. The prediction of gravity thickener performance by characterizing relevant material properties is of great importance, and batch settling and pressure filtration have proven to be the most useful methods for characterizing the dewaterability of tailings for gravity thickener performance predictions. In this research, batch settling and pressure filtration experiments were conducted to obtain dewatering data with respect to gel point, compressive yield stress, and hindered settling function by curve fitting. A predictive algorithm of steady-state thickening, proposed by Usher, was introduced and a rakeless deep cone thickener model was constructed to analyze the effect of flocculant dosage, underflow concentration, and mud height on solid flux and solid throughput. The results indicate that flocculant dosage has a greater impact on the settling zone than on the compaction zone, optimum thickening performance is obtained at a dosage of 20 g·t-1, and as underflow concentration increases, solid flux decreases. Solid flux was determined to be related to the concentration, and not influenced by mud height in the settling zone, whereas, in the compaction zone, solid flux is a function of concentration and mud height. In the range of the model's parameters, solid throughput is a function of concentration and mud height at heights less than 3.5 m, and the change law of solid throughput is similar to that of solid flux. |
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