含锌电炉粉尘钙化碳热还原焙烧实验  

Experiment on Calcified Carbothermal Reduction Roasting of ZincContaining Electric Furnace Dust

作　　者：余水 邱家用[1] 居殿春[1] 朱开琦 陶雨倩 毛瑞 YU Shui;QIU Jiayong;JU Dianchun;ZHU Kaiqi;TAO Yuqian;MAO Rui(School of Metallurgical and Materials Engineering,Jiangsu University of Science and Technology,Suzhou 215600,Jiangsu,China;Laboratory of Iron Making Environment,Institute of Research of Iron and Steel,Jiangsu Sha-steel,Suzhou 215600,Jiangsu,China)

机构地区：[1]江苏科技大学冶金与材料工程学院,江苏苏州215600 [2]江苏沙钢钢铁研究院炼铁环境研究室,江苏苏州215625

出　　处：《矿产综合利用》2024年第3期135-142,156,共9页Multipurpose Utilization of Mineral Resources

基　　金：“十三五”国家重点研发计划基金资助项目(2017YFB0603801);江苏省自然科学基金资助项目(BK20161271);江苏科技大学本科创新创业训练计划项目。

摘　　要：这是一篇冶金工程领域的论文。为强化含锌电炉粉尘中锌和铁资源的有效分离与回收,并降低碳还原剂消耗,提出以电炉粉尘制备高碱度炉料进行钙化碳热还原焙烧的思路和方法。采用热力学计算和实验研究相结合,分析电炉粉尘钙化碳热还原焙烧过程中主要物相转变规律,探究其钙化碳热还原反应行为和路径。结果表明,当碳氧摩尔比nc/no<0.6和温度低于1000℃时,ZnFe_(2)O_(4)还原生成Fe_(0.85-x)Zn_(x)O,抑制锌的还原和挥发。而添加CaO均能将ZnFe_(2)O_(4)和Fe_(0.85-x)Zn_(x)O钙化生成Ca_(2)Fe_(2)O_(5),Ca_(2)Fe_(2)O_(5)会被进一步还原。当温度低于1100℃及nc/no<1.0时,含锌电炉粉尘钙化碳热还原焙烧反应路径为:ZnFe_(2)O_(4)+CaO→Ca_(2)Fe_(2)O_(5)+ZnO→Ca_(2)Fe_(2)O_(5)+Zn(g)和Fe_(0.85-x)Zn_(x)O+CaO→Ca_(2)Fe_(2)O_(5)+ZnO+FeO→Ca_(2)Fe_(2)O_(5)+Fe+Zn(g)。这两种反应均能促进锌的释放。在nc/no为0.4~1.2,焙烧温度为1000~1100℃,CaO能促进锌的挥发,钙化碳热还原焙烧nc/no=1.0时的脱锌率与碳热还原焙烧nc/no=1.2时接近,均在90%左右。因此,钙化碳热还原焙烧可降低碳还原剂消耗,节约能耗。This is an article in the field of metallurgical engineering.In order to strengthen the effective separation and recovery of zinc and iron resources in zinc containing electric arc furnace dust(EAFD),and reduce the consumption of carbon reducing agent,the idea and method of calcified carbothermal reduction roasting with high basicity burden prepared from EAFD was proposed.Thermodynamic calculation and test study were combined,the main phase transformation during the calcified carbothermal reduction roasting process of EAFD was analyzed to explore calcified carbothermal reduction reaction behavior and path.It is shown that the reduction of ZnFe_(2)O_(4)to Fe_(0.85-x)Zn_(x)O inhibits the reduction and volatilization of zinc when the molar ratio of carbon to oxygen is less than 0.6 and the temperature is lower than 1000℃.While the calcification of ZnFe_(2)O_(4)and Fe_(0.85-x)Zn_(x)O to Ca_(2)Fe_(2)O_(5)by adding CaO can promote the reduction of zinc and Ca_(2)Fe_(2)O_(5)will be further reduced.When the temperature is lower than 1100℃and nc/no<1.0,the reaction path of calcified carbothermal reduction roasting is ZnFe_(2)O_(4)+CaO→Ca_(2)Fe_(2)O_(5)+ZnO→Ca_(2)Fe_(2)O_(5)+Zn(g)and Fe_(0.85-x)Zn_(x)O+CaO→Ca_(2)Fe_(2)O_(5)+ZnO+FeO→Ca_(2)Fe_(2)O_(5)+Fe+Zn(g).Both of these reactions can promote the release of zinc.The results show that CaO can promote zinc volatilization in the range of nc/no 0.4~1.2 and calcination temperature 1000~1100℃.The dezincification rate of calcified carbon thermal reduction roasting at nc/no=1.0 is close to that at nc/no=1.2,both of which are about 90%,so the consumption of carbon reducing agent can be reduced and energy consumption can be saved.

关 键 词：冶金工程 电炉粉尘 钙化碳热还原焙烧 物相转变 脱锌率 资源化利用 

分 类 号：TD982[矿业工程—选矿] TF82[冶金工程—有色金属冶金]