控制电位氧化法铅阳极泥脱砷  

Removing arsenic from lead anode slime by oxidation under potential control

作　　者：杨天足[1] 王安[1] 刘伟锋[1] 张杜超[1] 文剑锋[1] 吴江华[1] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2012年第7期2482-2488,共7页Journal of Central South University:Science and Technology

基　　金：湖南省重大科技专项资助项目(2009FJ1007)

摘　　要：采用压缩空气和双氧水作氧化剂,通过控制氢氧化钠体系中的电位来氧化浸出铅阳极泥中的砷。试验中考察电位、NaOH浓度、反应温度、反应时间和液固质量比对脱砷效果的影响,确定碱性浸出过程中预脱砷的最佳工艺条件:NaOH浓度为2 mol/L,温度为80℃,液固质量比为5:1,通入0.2 MPa的压缩空气4 h后用双氧水调节体系的电位至-180 mV,反应时间为2 h。在此条件下,砷的浸出率可达98%以上。碱浸液经冷却过滤掉结晶砷酸钠后,返回浸出过程,砷的浸出率达98%以上,实现碱浸液的循环利用以及砷与其他金属的有效分离。Arsenic was leached from lead anode slime with the oxidants including compressed air and hydrogen peroxide by potential control in sodium hydroxide system. The effects of potential, concentration of sodium hydroxide, reaction temperature, reaction time and solid/liquid ratio on arsenic removal were investigated and the optimum conditions of the arsenic removal in the alkaline leaching process were determined as follows： NaOH concentration of 2 mol/L, reaction temperaatre at 80 ℃, solid/liquid ratio of 5：1, 0.2 MPa compressed air into reaction system for 4 h, controlling the potential at -180 mV, and reaction time for 2 h. More than 98% of the amount arsenic is removed under these conditions. The alkaline leaching solution is returned to leaching process after the removal of crystal sodium arsenate by cooling and filtration, which achieves the recycling of alkaline solution and the effective separation of arsenic from other metals.

关 键 词：铅阳极泥 氧化浸出 脱砷 电位控制 

分 类 号：TF04[冶金工程—冶金物理化学]