naa a22 4500 510821537 CHVBK 20180411083535.0 cr unu---uuuuu 180411e20130201xx s 000 0 eng 10.1007/s11814-012-0211-0 doi (NATIONALLICENCE)springer-10.1007/s11814-012-0211-0 The solids concentration distribution in the deep cone thickener: A pilot scale test [Elektronische Daten] [Huazhe Jiao, Aixiang Wu, Hongjiang Wang, Shuiping Zhong, Renman Ruan, ShengHua Yin] Cemented backfill or surface deposition of paste tailings is increasingly being considered as a simple and effective means of reducing the hazards of conventional slurry deposition and recovering water for recycle. Although gravity thickening has been widely used in the mineral industry to increase the solids concentration of tailings, the accurate prediction of the concentration distribution in three-dimensions and discontinuous operational state has proven to be difficult. We investigated the axial and radial solids concentration distribution at discontinuous state in a pilot deep cone thickener as a function of bed height and residence time. The feed flux of lead/zinc tailings was 0.254 t·h−1· m−2 with a flocculant (high molecular weight anionic polyacrylamide) dose of 20 g/t. The thickened solids bed was sheared by a rotating rake at a rate of 0.2 rpm. The underflow was recirculated at a flux of 0.5 t·h−1·m−2, which can introduce additional shear stresses into the bed. The results of the bed density profile showed that, beside the clarification zone, the area below the feedwell could be divided into four zones: the dilution zone caused by free settling and diffusing action, the hindered settling zone in which the concentration was lower than the gel point, the unraked bed zone with a large concentration gradient and, finally, the raking zone with the highest slurry concentration and lower concentration gradient. Korean Institute of Chemical Engineers, Seoul, Korea, 2013 Thickening nationallicence Dewatering nationallicence Concentration Distribution nationallicence Pilot Scale Deep Cone Thickener nationallicence Jiao Huazhe State Key Laboratory of Comprehensive Utilization of Low-Grade Refractory Gold Ores, Zijin Mining Group Co., Ltd., 364200, Shanghang, China aut Wu Aixiang School of Civil and Environment Engineering, University of Science and Technology Beijing, 100083, Beijing, China aut Wang Hongjiang School of Civil and Environment Engineering, University of Science and Technology Beijing, 100083, Beijing, China aut Zhong Shuiping State Key Laboratory of Comprehensive Utilization of Low-Grade Refractory Gold Ores, Zijin Mining Group Co., Ltd., 364200, Shanghang, China aut Ruan Renman State Key Laboratory of Comprehensive Utilization of Low-Grade Refractory Gold Ores, Zijin Mining Group Co., Ltd., 364200, Shanghang, China aut Yin ShengHua School of Civil and Environment Engineering, University of Science and Technology Beijing, 100083, Beijing, China aut Korean Journal of Chemical Engineering Springer US; http://www.springer-ny.com 30/2(2013-02-01), 262-268 0256-1115 30:2<262 2013 30 11814 https://doi.org/10.1007/s11814-012-0211-0 text/html Onlinezugriff via DOI 1 review-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11814-012-0211-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Jiao Huazhe State Key Laboratory of Comprehensive Utilization of Low-Grade Refractory Gold Ores, Zijin Mining Group Co., Ltd., 364200, Shanghang, China aut NATIONALLICENCE 700 1- Wu Aixiang School of Civil and Environment Engineering, University of Science and Technology Beijing, 100083, Beijing, China aut NATIONALLICENCE 700 1- Wang Hongjiang School of Civil and Environment Engineering, University of Science and Technology Beijing, 100083, Beijing, China aut NATIONALLICENCE 700 1- Zhong Shuiping State Key Laboratory of Comprehensive Utilization of Low-Grade Refractory Gold Ores, Zijin Mining Group Co., Ltd., 364200, Shanghang, China aut NATIONALLICENCE 700 1- Ruan Renman State Key Laboratory of Comprehensive Utilization of Low-Grade Refractory Gold Ores, Zijin Mining Group Co., Ltd., 364200, Shanghang, China aut NATIONALLICENCE 700 1- Yin ShengHua School of Civil and Environment Engineering, University of Science and Technology Beijing, 100083, Beijing, China aut NATIONALLICENCE 773 0- Korean Journal of Chemical Engineering Springer US; http://www.springer-ny.com 30/2(2013-02-01), 262-268 0256-1115 30:2<262 2013 30 11814 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer