(中南大學(xué) 資源與安全工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 為了提高全尾砂料漿(CTR)的絮凝沉降指標(biāo)，將磁化處理技術(shù)引入到全尾砂料漿沉降試驗(yàn)中，分析自然沉降、磁化沉降、絮凝沉降和磁化絮凝沉降4種條件下全尾砂料漿沉降速度和底流質(zhì)量濃度的變化特性，探索磁化處理在全尾砂料漿絮凝沉降中的作用機(jī)理。結(jié)果表明：與未經(jīng)磁化處理的全尾砂料漿相比，磁化處理后的全尾砂料漿沉降指標(biāo)達(dá)到飽和時(shí)，PAC添加量節(jié)約40%；相同PAC添加量下，磁化處理后的全尾砂料漿沉降速度提高18~55 cm/h、底流濃度提高約0.8%~2.0%。全尾砂料漿磁化絮凝沉降的最優(yōu)條件為：磁感應(yīng)強(qiáng)度0.2 T，料漿速度2 m/s，磁化時(shí)間2 min，PAC添加量30 g/t；適合磁化處理?xiàng)l件下，對(duì)全尾砂料漿進(jìn)行磁化處理可明顯提高其沉降指標(biāo)。
關(guān)鍵字: 全尾砂；絮凝沉降；磁化處理；磁化機(jī)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
