基于动态沉降压密实验的深锥浓密机关键参数确定

发布时间：2018-03-01 12:26

本文关键词： 动态沉降压密搅拌速率底流浓度直径高度　出处：《中国有色金属学报》2017年08期 　论文类型：期刊论文

【摘要】：基于动态沉降压密实验,研究浓密机耙架在不同搅拌速率下的浓密效果。结果表明:各搅拌速率下停留8 h时,浓密机底流浓度(质量分数)均达到最大,随着搅拌速率的增加,底流浓度先增加后降低,底流浓度随搅拌速率的增加符合抛物线变化规律;搅拌速率1 r/min时达到最大底流浓度74.54%,搅拌速率0.1 r/min时达到最小底流浓度71.38%,适合该尾矿的最佳搅拌速率为0.4 r/min,此时底流浓度为72.55%。最后基于凯奇沉降模型、供排料平衡理论,建立浓密机直径计算模型和高度确定方法,浓密机直径与最小沉降速率密切相关,浓密机泥层高度与直径比为0.9时可取得最佳底流浓度。以新疆某铜矿深锥浓密机为例,计算得到浓密机直径为14 m。高度为14 m,浓密机试运行表明:浓密机底流浓度维持在69.5%~72%之间,浓缩效果良好。研究成果为深锥浓密机关键参数确定提供重要的方法及理论依据。
[Abstract]:Based on the dynamic sedimentation and compaction experiment, the thickening effect of the rake frame of the thickener at different stirring rates is studied. The results show that the concentration (mass fraction) of the bottom flow of the thickener reaches the maximum when each stirring rate stays for 8 h. With the increase of stirring rate, the bottom flow concentration first increases and then decreases, and the bottom flow concentration increases with the agitation rate, which conforms to the parabola variation rule. The maximum bottom flow concentration is 74.54 at the stirring rate of 1 r / min, and the minimum bottom flow concentration at the stirring rate of 0.1 r / min is 71.38. The optimum stirring rate for the tailings is 0.4 r / min, and the bottom flow concentration is 72.55. Finally, based on the case sedimentation model, the equilibrium theory of supply and discharge is used. The calculation model of thickener diameter and the method of height determination are established. The diameter of thickener is closely related to the minimum settlement rate. The optimum bottom flow concentration can be obtained when the ratio of height to diameter of thickener mud layer is 0.9. Taking a deep cone thickener of a copper mine in Xinjiang as an example, The diameter and height of the thickener are 14 m and 14 m respectively. The test operation of the thickener shows that the concentration of the bottom flow of the thickener is between 69.5% and 72%, and the concentration effect is good. The research results provide an important method and theoretical basis for the determination of the key parameters of the deep cone thickener.
【作者单位】：北京科技大学土木与资源工程学院;伽师县铜辉矿业有限责任公司;陡埠(北京)科技服务有限公司;
【基金】：国家自然科学基金资助项目(51374034) 北京市科技计划项目(Z161100001216002) 国家“十二五”科技支撑计划项目(2012BAB08B02)~~
【分类号】：TD40

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