摘要
以砷存在形态为Pb As_2O_6、Pb_2As_2O_7、(Fe,Zn)_3(As O_4)_2·8H_2O和As_2O_3的铜冶炼高砷烟尘为研究对象,用热力学方法分析其特征砷化合物的溶解行为,并进行浸出实验及X-射线衍射(XRD)分析,进而揭示高砷烟尘中含砷物相的浸出机理。结果表明,在反应温度为25℃,浸出时间为30 min,液固质量比为5∶1,硫酸质量浓度为20%以及搅拌速度为300 r/min的浸出条件下,As浸出率达95%;浸出过程中,Pb As_2O_6、Pb_2As_2O_7、Zn_3(As O_4)_2·8H_2O和As_2O_3发生溶解,同时有Pb SO_4沉淀生成。高砷烟尘中含砷物相的有效溶解,为后序液相脱砷以及有价金属和贵金属的回收创造了有利条件。
A high arsenic dust was investigated from a copper metallurgical process,in which major arsenic components were Pb As2O6,Pb2As2O7,（Fe,Zn）3（As O4）2·8H2O and As2O3.Thermodynamic calculation method was employed to analyze the dissolved behavior of major arsenic compounds of high arsenic dust.Besides,X-ray diffraction（XRD）analysis and leaching experiments were used to demonstrate the dissolved mechanism of high arsenic dust.The results showed that the leaching rate of arsenic can reach about 95%when leaching conditions were as follows：leaching temperature 25℃,leaching time 30 min,the ratio of liquid to high arsenic dust 5∶1,concentration of sulfuric acid 20%,and stirring speed 300 r/min.Additionally,the dissolution of Pb As2O6,Pb2As2O7,Zn3（As O4）2·8H2O,As2O3and formation of Pb SO4occurred in the leaching process of high arsenic dust.Therefore,it is beneficial to remove arsenic and recover metals for the effectively leaching of arsenic compounds from high arsenic dust in the subsequent stage.
作者
宋向荣
刘海浪
罗中秋
夏举佩
周新涛
和森
左艳玲
SONG Xiang- rong;LIU Hai- lang;LU;XIA Ju- pei;ZHOU Xin- tao;HE Sen;ZU(Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,China;Key Laboratory of Unconventional Metallurgy,Ministry of Education,Kunming University of Science and Technology,Kunming 650093,China;Yunnan Branch,China National Geological Exploration Center of Building Material Industry,Kunming 650100,China)
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2018年第7期2304-2308,2314,共6页
Bulletin of the Chinese Ceramic Society
基金
云铜校企预研基金(2015YT08)
昆明理工大学引进人才科研启动基金(KKSY201605021)
昆明理工大学分析测试基金(2016T20160009)
云南省科学技术厅青年基金(2017FD093)
云南省教育厅资助性项目(2017ZZX147)
关键词
热力学分析
高砷烟尘
浸出
thermodynamic analysis
high arsenic dust
leaching
