Recovery of antimony from antimony-bearing dusts through reduction roasting process under CO–CO_2 mixture gas atmosphere after firstly oxidation roasted  

含锑烟尘氧化焙烧处理后CO–CO_2混合气体中锑资源的还原焙烧法回收（英文）

作　　者：ZHONG Da-peng LI Lei TAN Cheng 钟大鹏;李磊;谈诚

机构地区：[1]State Key Laboratory of Complex Non-ferrous Metal Resources Clean Utilization,Kunming University of Science and Technology [2]Engineering Research Center of Metallurgical Energy Conservation and Emission Reduction of Ministry of Education, Kunming University of Science and Technology [3]Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology

出　　处：《Journal of Central South University》2018年第8期1904-1913,共10页中南大学学报（英文版）

基　　金：Project(51564034)supported by the National Science Fund for Distinguished Regional Scholars,China

摘　　要：This paper mainly investigated the antimony recovery from antimony-bearing dusts through reduction roasting process after the dust firstly oxidation roasted.CO–CO2 mixture gas was used as reducing agent,and the antimony-containing phase was reduced into Sb4O6,volatilized into smoke,and finally recovered through the cooling cylinder.The antimony recovery rate increased from 66.00 wt%to 73.81 wt%in temperature range of 650 to 800°C,and decreased with temperature increased further to 900°C due to the reduction of Sb4O6 to the nonvolatile Sb.Similarly,the CO partial pressure also played a double role in this test.Under optimized conditions of roasting temperature of 800°C,CO partial pressure of 7.5 vol%and roasting time of 120 min,98.40 wt%of arsenic removal rate and 80.40 wt%antimony recovery rate could be obtained.In addition,the“As2O3”product could be used for preparing ferric arsenate which realized the harmless treatment of it.研究主要针对含锑烟尘经氧化焙烧处理后CO–CO_2混合气体中锑资源的还原焙烧法回收进行了探讨。以CO–CO_2混合气体作为还原剂,过程中锑物相还原为Sb_4O_6并进入气相,最后通过冷凝收尘方式实现其回收。温度由650℃升高至800℃时,锑回收率从66.00 wt%增至73.81 wt%,当温度进一步升高到900℃时,Sb_4O_6被进一步还原为非挥发性金属锑,锑回收率降低。同样,CO分压对锑的挥发回收亦起双重作用。在最优焙烧条件下,即焙烧温度800℃、CO分压7.5 vol%及焙烧时间120min时,锑烟尘中砷挥发率可达98.40 wt%,同时锑回收率亦可达80.40 wt%。此外,挥发脱除的"As_2O_3"烟尘可用于制备砷酸铁,以实现其无害化处理。

关 键 词：antimony-bearing dust separation of arsenic and antimony antimony recovery reduction roasting waste utilization 

分 类 号：TF818[冶金工程—有色金属冶金]