北营铁尾矿动态沉降试验研究  

Experimental Dynamic Settlement of Beiying Iron Tailings

作　　者：张艺邺 崔宝玉[1] 王小宇[1,2] 马聪玉 宁琴 李强 ZHANG Yiye;CUI Baoyu;WANG Xiaoyu;MA Congyu;NING Qin;LI Qiang(School of Resources and Civil Engineering,Northeastern University,Shenyang 110003,Liaoning,China;BGRIMM Technology Group Co.,Ltd.,Beijing 100160,China;Institute of mining technology,Liaoning Technical University,Fuxin 123000,Liaoning,China;Department of Safety and Emergency Management,Yantai Engineering and Technology College,Yantai 264006,Shandong,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]矿冶科技集团有限公司,北京100160 [3]辽宁工程技术大学矿业学院,辽宁阜新123000 [4]烟台工程职业技术学院安全与应急管理系,山东烟台264006

出　　处：《矿产保护与利用》2023年第3期160-167,共8页Conservation and Utilization of Mineral Resources

基　　金：国家自然科学基金项目(51974066);中央高校基本科研业务专项资金项目(N2201004)。

摘　　要：为了提高本溪北营铁尾矿的浓密效果,开展了以动态沉降试验为主、静态沉降试验为辅的试验研究。首先进行静态的絮凝剂优选试验,以澄清层界面高度、沉降速率和固体质量浓度为指标,探究絮凝剂类型、陈化时间、絮凝剂质量浓度对絮凝沉降的影响;再运用动态浓密装置,在连续入料和给药的情况下,以堆积速度、溢流含固量和底流质量浓度为指标,探究矿浆质量浓度、入料速度、加药速度对絮凝沉降的影响。研究结果表明:静态沉降试验中,在陈化时间24 h、质量浓度0.3‰时的阳离子型聚丙烯酰胺比工厂现场絮凝剂的絮凝效果好;在3 min时,尾矿沉降趋于稳定,此时的澄清层界面高度为42 mm,沉降速率为0.03 mm/min,固体浓度为70.24%;在矿浆质量浓度14%、入料速度0.4 L/min、加药速度12 mL/min时,铁尾矿的动态沉降效果最好,此时的溢流含固量为279 mg/L,底流质量浓度为68.05%;相同条件下的工厂现场絮凝剂动态沉降效果较差,溢流含固量为282 mg/L,底流质量浓度为62.32%。Dynamic settling experiments were carried out assisted with static settling experiments to improve the thickening performance of Benxi Beiying iron tailings.The static optimizing experiments of flocculant were firstly carried out to explore the effects of flocculant type,aging time,and mass concentration of flocculant on flocculation settling performance,taking the height of clear layer,settling rate and solid mass concentration as indicators.Then experiments in the dynamic thickening device were carried out to investigate the effect of mass concentration of slurries,feed rate and dosing rate of flocculant on the flocculation settling under the continuous feed of slurries and flocculant.The accumulation rate,solid mass in the overflow and mass concentration of the underflow were used to evaluate the above experiments.Results shows that the cationic polyacrylamide(PAM)with aging time of 24 h and mass concentration of 0.3‰had better flocculation performance than the on-site flocculant in the static settling experiment.At the 3 min of static settling experiments,the settling of tailings tended to stabilize.In this case,the height of clear layer was 42 mm,the settling rate was 0.03 mm/min and the solid mass concentration was 70.24%.The iron tailings achieved best dynamic settling effect,when the feed concentration of slurries was 14%,the feeding rate was 0.4 L/min,and the dosing rate was 12 mL/min.In this case,the solid mass in the overflow was 279 mg/L and the mass concentration of the underflow was 68.05%.Under the same conditions,the dynamic settling effect in the plant site was poor,with the solid mass of 282 mg/L in the overflow and the mass concentration of 62.32%of the underflow.

关 键 词：铁尾矿 絮凝沉降 动态浓密 

分 类 号：TD926.4[矿业工程—选矿]