摘要
某铜冶炼渣的锌含量为5.15%,主要以氧化锌的形式存在,并有少量硫化锌和硅酸锌。为确定该二次资源的开发利用方案,进行了真空碳热还原试验。结果表明:①配碳量增加,锌挥发率先显著上升后上升趋缓;反应体系从自然碱度提高至碱度0.6,锌挥发率显著上升至90%以上。②在初始真空度为10 Pa,1000℃保温0.5 h,反应体系的碱度为0.6,配碳量为理论量的1.9倍时,锌挥发率达97.72%;CaO不仅能促进ZnS、Zn_(2)SiO_(4)的还原,同时可避免渣的烧结。③1.9倍理论配碳量情况下的还原渣中的主要物相为CaFe+2SiO_(4),Fe_(3)O_(4)和Fe,为后续从渣中回收铁创造了条件。
The zinc content of a copper smelting slag is 5.15%,and the zinc is mainly in the form of zinc oxide,followed by a small amount of zinc sulfide and zinc silicate.In order to determine the development and utilization scheme of the secondary resource,the vacuum carbothermal reduction test was carried out.The results showed that:①with the increase of carbon content,the volatilization rate of zinc increases significantly at first and then slows down.The reaction system increased from natural alkalinity to alkalinity 0.6,and the volatilization rate of zinc increased significantly to above 90%.②With the initial vacuum of 10 Pa,the temperature of 1000℃for 0.5 h,the alkalinity of the reaction system of 0.6,and the carbon content of 1.9 times of the theoretical amount,the volatilization rate of zinc is 97.72%.CaO can not only promote the reduction of ZnS and Zn_(2)SiO_(4),but also avoid the sintering of slag.③Under the condition of 1.9 times the theoretical carbon content,the main phases in the reduction slag are CaFe+2SiO4,Fe_(3)O_(4)and Fe,which creates the conditions for the subsequent recovery of iron from the slag.
作者
阳建国
马红周
王耀宁
YANG Jianguo;MA Hongzhou;WANG Yaoning(Xi'an Engneering Investigation&Design Research Institute of China National Nonferrous Metals Indus-try Co.,Ltd.;College of Metallurgical Engineering,Xi'an University of Architecture and Technology;Key Laboratory of Gold and Resources in Shaanxi Province)
出处
《现代矿业》
CAS
2022年第8期181-184,共4页
Modern Mining
基金
陕西省自然科学基础研究研究计划项目(编号:2019JLM-36)。
关键词
真空碳热还原
锌
铜冶炼渣
氧化钙
vacuum carbothermal reduction
zinc
copper smelting slag
calcium oxide
