含砷铜渣N_2-CO气氛中还原焙烧脱砷新工艺  

New Technique for Removing Arsenic from Arsenic-containing Copper Slag by Reduction-Roasting in N_2-CO Atmosphere

作　　者：万新宇[1] 齐渊洪[1] 高建军[1] 

机构地区：[1]钢铁研究总院先进钢铁流程及材料国家重点实验室,北京100081

出　　处：《矿冶工程》2017年第6期80-83,共4页Mining and Metallurgical Engineering

基　　金：国家科技支撑计划(2013BAE07B02)

摘　　要：在分析含砷铜渣理化性质的基础上,研究了铜渣中砷在N2-CO弱还原焙烧过程中的挥发行为,系统考察了还原温度、还原时间和CO浓度等因素对脱砷效果的影响。结果表明,在氮气中通入一定的CO气体可实现砷酸盐的还原,并抑制铁橄榄石和磁铁矿的还原。在还原温度1 100℃、焙烧时间60 min、CO浓度2.5%、铜渣粒度75~100μm的条件下预处理后,铜渣中砷含量仅为0.044%,脱除率可达到70.17%,脱砷效果明显,为后续直接还原提铁实验提供了良好的原料条件。Based on an analysis of physicochemical properties of arsenic-containing copper slag,the volatilization of arsenic during the reduction roasting in N2-CO atmosphere was studied,and effects of reduction temperature,reduction time,and CO concentration on the volatilization rate of arsenic were investigated. Results show that N2 with a certain influx of CO can not only lead to the reduction of arsenate,but also inhibit the reduction of iron olivine and magnetite. It is found that pretreatment by reduction at a temperature of 1 100 ℃ for 60 min,with CO concentration at 2.5%,copper slag with particle size within the range of 75 ~ 100 μm,can result in the copper slag with the remained arsenic content only around 0.044%,with arsenic removal rate remarkably up to 70.17%,which can be taken as a good material for the subsequent direct reduction experiments for iron extraction.

关 键 词：铜渣 还原焙烧 脱砷 

分 类 号：TF046[冶金工程—冶金物理化学]