铁矾渣热分解行为及焙烧脱硫机理研究  

Study on Thermal Decomposition Behavior and Roasting Desulfurization Mechanism of Jarosite Residue

作　　者：胡明 虎训 邵哲如 程易[2] 宫臣 王婷婷 徐鹏程 齐景伟 HU Ming;HU Xun;SHAO Zhe-ru;CHENG Yi;GONG Chen;WANG Ting-ting;XU Peng-cheng;QI Jing-wei(Postdoctoral Workstation of China Everbright Group, Beijing 1000aa, China;Department of Chemical Engineering Tsinghua University, Beijing 100084, China;Everbright Envirotech （China） Ltd. , Nanjing 211102, China)

机构地区：[1]中国光大集团博士后工作站,北京100033 [2]清华大学化学工程系,北京100084 [3]光大环保技术研究院(南京)有限公司,南京211102

出　　处：《有色金属（冶炼部分）》2018年第4期32-38,共7页Nonferrous Metals（Extractive Metallurgy)

摘　　要：采用TG-DSC和高温原位XRD分析方法对铁矾渣热分解过程进行研究,并通过电阻炉对铁矾渣进行焙烧脱硫预处理。结果表明,铁矾渣热分解过程主要存在两个分解反应,分别是NaFe_3(SO_4)_2(OH)_6和Fe_2(SO_4)_3的分解,800℃后的焙烧产物主要是ZnO·Fe_2O_3和Fe_2O_3;采用Kissinger法和Flynn-Wall-Ozawa法计算出铁矾渣在350~450℃和630~800℃范围内两个分解反应的表观活化能分别为150、170kJ/mol,两个反应均受界面化学反应控制,反应的机理函数G(α)分别为1-(1-α)^(1/3)和1-(1-α)^(1/2)。焙烧脱硫结果表明,在中性气氛、温度1 300℃、焙烧时间20min、气体流量0.4m^3/h的条件下,铁矾渣脱硫率为98.57%,焙烧脱硫后,铁矾渣中的黄钠铁矾转化为ZnO·Fe_2O_3和Fe_2O_3,重金属离子得到固化,有害元素得到有效脱除。Thermal decomposition process of jarosite residue was investigated by TG-DSC and high temperature in-situ XRD.Jarosite residue was pretreated in resistance furnace to remove sulfur.The results show that there are two decomposition reactions of NaFe3（SO4）2（OH）6 and Fe2（SO4）3 in thermal decomposition process of jarosite residue,and ZnO·Fe2O3 and Fe2O3 is the main product after jarosite residue＇s being roasted at 800 ℃.Activation energy of thermal decomposition reaction at temperature ranges of 350~450 ℃ and 630~800 ℃ is 150 kJ/mol and 170 kJ/mol respectively calculated by Kissinger method and Flynn-Wall-Ozawa method.The two reactions are subject to interfacial chemical reaction control with reaction mechanism function G（α）of 1-（1-α）^（1/3） and 1-（1-α）^（1/2） respectively.The results of roasting desulfurization show that the desulfurization rate is 98.57% under the optimum conditions including roasting temperature of 1 300 ℃,roasting time of 20 min at neutral atmosphere,and gas flow rate of 0.4 m^3/h.ZnO·Fe2O3 and Fe2O3 are the main phases of roasted jarosite residue,heavy metal ions are solidified,and harmful elements are removed effectively.

关 键 词：铁矾渣 热分解 焙烧预处理 脱硫 

分 类 号：TF09[冶金工程—冶金物理化学]