(中南大学 资源与安全工程学院，长沙 410083)
摘 要: 为了提高全尾砂料浆(CTR)的絮凝沉降指标，将磁化处理技术引入到全尾砂料浆沉降试验中，分析自然沉降、磁化沉降、絮凝沉降和磁化絮凝沉降4种条件下全尾砂料浆沉降速度和底流质量浓度的变化特性，探索磁化处理在全尾砂料浆絮凝沉降中的作用机理。结果表明：与未经磁化处理的全尾砂料浆相比，磁化处理后的全尾砂料浆沉降指标达到饱和时，PAC添加量节约40%；相同PAC添加量下，磁化处理后的全尾砂料浆沉降速度提高18~55 cm/h、底流浓度提高约0.8%~2.0%。全尾砂料浆磁化絮凝沉降的最优条件为：磁感应强度0.2 T，料浆速度2 m/s，磁化时间2 min，PAC添加量30 g/t；适合磁化处理条件下，对全尾砂料浆进行磁化处理可明显提高其沉降指标。
关键字: 全尾砂；絮凝沉降；磁化处理；磁化机理
（School of Resources and Safety Engineering, Central South University, Changsha Hunan 410083, China）
Abstract:In order to improve flocculating sedimentation effect of crude tailings slurry (CTR), magnetic treatment technique was introduced into sedimentation experiment of CTR. The variational laws of sedimentation velocity and underflow density of CTR were investigated under natural sedimentation, pre-magnetized sedimentation, flocculating sedimentation and pre-magnetized flocculating sedimentation experiments, and their magnetic mechanism was discussed. The experimental results show that compared with unmagnetized CTR, PAC addition amount for pre-magnetized CTR decreased by 40% at saturation sedimentation, sedimentation velocity and underflow density of pre-magnetized CTR increases by 18-55 cm/h and 0.8%-2.0%, respectively, at the same PAC addition amount. The experimental results also suggest that flocculating sedimentation has the best effect when magnetic induction is 0.2 T, CTR’s cycling velocity is 2 m/s, magnetizing time is 2 min, and PAC addition amount is 30 g/t, and the sedimentation effect of CTR can be improved under suitable condition of magnetic treatment.
Key words: crude tailings slurry; flocculating sedimentation; magnetic treatment; magnetic mechanism
