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。
Based on dynamical settling and compaction,the thickening effect of a thickener at different stirring rates of rake was researched.The results show that the underflow concentration of thickener reaches the maximum when the residence time is 8 h at different stirring rates,the underflow concentration increases firstly,then decreases with the stirring rate increasing,which accords with the law of parabola;the maximum underflow concentration of 74.54% is obtained when the stirring rate is 1 r/min,and the minimum underflow concentration of 71.38% is obtained when the stirring rate is 0.1 r/min;the optimum stirring rate which is suitable to the tailings,the optimum underflow concentration is 72.55%.The calculation model and height determining method of thickener are obtained based on a Cage settlement mode and material supplying and discharging theory.The thickener diameter has closely linked to the minimum settlement velocity,the optimum underflow concentration is obtained when the mud layer to diameter of thickener is 0.9.The diameter and height of a thickener are all 14 m through calculating,the field area results show that the underflow concentration keeps stable between 69.5% and 72%,having a good thickening effect.The models can be used as a way to study the key parameters of deep cone thickener.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2017年第8期1693-1700,共8页
The Chinese Journal of Nonferrous Metals
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)~~
关键词
动态沉降压密
搅拌速率
底流浓度
直径
高度
dynamical settling and compaction
stirring rate
underflow concentration
diameter
height
