(1. 北京科技大學(xué) 土木與資源工程學(xué)院，北京 100083； 2. 伽師縣銅輝礦業(yè)有限責(zé)任公司，喀什 844000； 3. 陡埠(北京)科技服務(wù)有限公司，北京 101101)
摘 要: 基于動態(tài)沉降壓密實驗，研究濃密機耙架在不同攪拌速率下的濃密效果。結(jié)果表明：各攪拌速率下停留8 h時，濃密機底流濃度(質(zhì)量分數(shù))均達到最大，隨著攪拌速率的增加，底流濃度先增加后降低，底流濃度隨攪拌速率的增加符合拋物線變化規(guī)律；攪拌速率1 r/min時達到最大底流濃度74.54%，攪拌速率0.1 r/min時達到最小底流濃度71.38%，適合該尾礦的最佳攪拌速率為0.4 r/min，此時底流濃度為72.55%。最后基于凱奇沉降模型、供排料平衡理論，建立濃密機直徑計算模型和高度確定方法，濃密機直徑與最小沉降速率密切相關(guān)，濃密機泥層高度與直徑比為0.9時可取得最佳底流濃度。以新疆某銅礦深錐濃密機為例，計算得到濃密機直徑為14 m。高度為14 m，濃密機試運行表明：濃密機底流濃度維持在69.5%~72%之間，濃縮效果良好。研究成果為深錐濃密機關(guān)鍵參數(shù)確定提供重要的方法及理論依據(jù)。
關(guān)鍵字: 動態(tài)沉降壓密；攪拌速率；底流濃度；直徑；高度
（1. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Jiashi County Tonghui Mining Co. Ltd., Kashi 844000, China; 3. Steep port (Beijing) Technology Service Co. Ltd., Beijing 101101, China）
Abstract: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.
Key words: dynamical settling and compaction; stirring rate; underflow concentration; diameter; height
