铬镍不锈钢酸洗污泥还原预处理脱硫动力学  

Desulfurization dynamics on reduction pre-treatment of sludge from pickling of chromium nickel stainless steel

作　　者：李小明[1] 尹卫东 沈苗[1] 邹冲[1] 崔雅茹[1] 赵俊学[1] 

机构地区：[1]西安建筑科技大学冶金工程学院

出　　处：《钢铁》2018年第2期83-90,共8页Iron and Steel

基　　金：国家自然科学基金面上资助项目(51574189,51774224)

摘　　要：铬镍不锈钢酸洗污泥含有镍、铬、铁等有价资源,将其返回冶炼工序可实现污泥去毒、消纳、资源化利用的目标。酸洗污泥返回炼钢利用的关键是硫酸盐在渣中的稳定性、转化和钢水增硫问题。针对上述问题,采用还原脱硫对酸洗污泥进行预处理,利用差热-热重方法对不锈钢酸洗污泥预还原过程脱硫动力学进行了分析。结果表明,脱硫反应阶段温度为800~1 000℃,低升温速率10℃/min有利于污泥中硫的去除。最概然机理函数为Avrami-Erofeev式,机理符合随机成核和随后生长模型,活化能为492.909 7 kJ/mol。Pickling sludge generated during the neutralization of pickling waste water with calcium hydroxide contains valuable resource,such as Ni,Cr and Fe,which can be returned to the smelting process to realize the target of sludge detoxification,consumption and resource utilization. The key of pickling sludge returning to steelmaking is the stability of sulphate in slag,conversion and prevention resulfurization of molten steel. Aiming at the problem above,reduction pretreatment of chromium nickel stainless steel pickling sludge was proposed,and desulfurization kinetics on reduction process of stainless steel pickling sludge was analyzed using differential thermal thermogravimetric method. The results show that at the temperature of desulfurization reaction 800-1 000 ℃,low heating rate 10 ℃/min is well for sulfur removal in the sludge. The most probable mechanism function of pickling sludge desulfurization process is Avrami-Erofeev formula,the mechanism is consistent with random nucleation and subsequent growth models,and the apparent activation energy of the thermal decomposition reaction is obtained as 492.909 7 kJ/mol.

关 键 词：铬镍不锈钢 酸洗污泥 还原预处理 脱硫 动力学 

分 类 号：X703[环境科学与工程—环境工程]