Bauxite washing for the removal of clay

作     者：Ishaq Ahmad Ernst-Ulrich Hartge Joachim Werther Reiner Wischnewski 

作者机构：Department of Mining Engineering University of Engineering and TechnologyPeshawar-25120 Pakistan Institute of Solids Process Engineering and Particle Technology Hamburg University of Technology (TUHH)Denickestrasse 1521073 Hamburg Germany Norsk Hydro Aluminum ASASkφyen Oslo Norway 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2014年第21卷第11期

页      面：1045-1051页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 081902[工学-矿物加工工程] 0806[工学-冶金工程] 08[工学] 0708[理学-地球物理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：Higher Education Commission (HEC) of Pakistan 

主　　题：beneficiation bauxite washing clay Bayer process 

摘      要：Clay impurities associated with bauxite negatively affect the Bayer process for alumina production. These impurities should be removed as far as possible by a beneficiation technique before the ore is used as feed for the Bayer process. In this current investigation, bauxite washing was conducted in the laboratory. Bauxite washing is a physical process that causes the disintegration and deagglomeration of the clay matrix, and bauxite is liberated from the clay（mainly rich in silica）. Subsequently, separation occurs with the assistance of wet screening at a predetermined cut size. Three techniques were investigated in the laboratory： drum washing, water-jet washing, and ultrasonic washing. Various operating parameters were investigated for drum washing and water-jet washing, including materials retention time, drum rotation speed, solid concentration, water-jet spray duration, pressure, and height. We concluded that the retention time of bauxite inside the drum at a solid concentration of 55wt% and a drum rotation speed of 31 r/min is the dominant parameter for the removal of clay from the bauxite surface.