Treatment of backwater in bauxite flotation plant and optimization by using Box-Behnken design  

基于Box-Behnken设计优化铝土矿选矿回水处理工艺参数（英文）

作　　者：Qiang HUO Xi LIU Li-jun CHEN Yong-hong WU Hai-yan WU Jianping XIE Xinxing LIU Guan-zhou QIU 霍强;刘晰;陈黎军;吴永宏;武海艳;谢建平;刘新星;邱冠周(中南大学资源加工与生物工程学院,长沙410083;中南大学生物冶金教育部重点实验室,长沙410083;中国铝业郑州有色金属研究院有限公司,郑州450041)

机构地区：[1]School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China [2]Key Laboratory of Biohydrometallurgy,Ministry of Education,Central South University,Changsha 410083,China [3]Zhengzhou Non-ferrous Metals Research Institute Co. Ltd. of CHALCO,Zhengzhou 450041,China

出　　处：《Transactions of Nonferrous Metals Society of China》2019年第4期821-830,共10页中国有色金属学报（英文版）

基　　金：Project(1053320170205)supported by the Research and Innovation Project of Graduate Students of Central South University,China;Project(502211704)supported by the Fundamental Research Funds for the Central Universities,China;Project(SKL-SPM-201809)supported by the State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals,China;Project(SKLAM005-2016)supported by the State Key Laboratory of Applied Microbiology Southern China;Projects(51320105006,51504106,51871250)supported by the National Natural Science Foundation of China;Project(2015FB204)supported by the Science and Technology Project of Yunnan Province,China

摘　　要：Flotation indexes gradually decrease with the increase of cycle time of the backwater in bauxite floatation,and discharge of backwater brings environmental risk.In this study,methods such as Fenton-oxidation,adsorption and coagulation were used in the treatment of backwater,the flotation indexes were checked after backwater treatments,and Box-Behnken design(BBD)was used in the optimization of the main operating parameters.The results reveal that flotation indexes are effectively improved after coagulation treatment by polyaluminum ferric chloride(PAFC).The optimum parameters predicted by BBD are pH 7.55,1.09 g/L PAFC dosage and temperature of 25℃.Under these optimum conditions,a maximum recovery of Al2O3 of 82.83%and a minimum A/S of 1.30 of tailings are gained,while the deviations are less than 3%from the predicted values.These findings encourage the application of BBD for the optimization of critical parameters in backwater treatment.随着铝土矿浮选回水循环时间的增加,铝土矿浮选指标逐渐降低,而浮选回水的外排会带来一定的环境风险。采用Fenton氧化、吸附、混凝等方法处理浮选回水,测定处理后浮选回水的浮选指标,并采用Box-Behnken设计(BBD)对主要试验参数进行优化。结果表明,聚合氯化铝铁对混凝处理后的浮选指标有明显的改善作用。BBD预测的最佳参数值为pH 7.55、聚合氯化铝铁用量1.09 g/L、温度25°C。在预测的最佳工艺参数下,精矿氧化铝回收率82.83%、尾矿铝硅比为1.30,结果与预测值的偏差均小于3%,这表明BBD适用于选矿回水处理中关键参数的优化预测。

关 键 词：backwater treatment bauxite flotation polyaluminum ferric chloride Box-Behnken design 

分 类 号：TD952[矿业工程—选矿]