利用高炉熔渣处理不锈钢酸洗污泥  

Utilization of stainless steel pickling sludge using the blast furnace molten slag

作　　者：马叙叙 顾宝澍 宿珀诚 王宁 高杰 张士董 邓旭东 春铁军 MA Xuxu;GU Baoshu;SU Pocheng;WANG Ning;GAO Jie;ZHANG Shidong;DENG Xudong;CHUN Tiejun(School of Metallurgical Engineering,Anhui University of Technology,Ma’anshan 243032,Anhui,China)

机构地区：[1]安徽工业大学冶金工程学院,安徽马鞍山243032

出　　处：《钢铁》2024年第5期185-193,共9页Iron and Steel

基　　金：安徽省优秀科研创新团队资助项目(2023AH010016)。

摘　　要：不锈钢酸洗污泥是在不锈钢生产过程中对不锈钢进行酸洗与钝化处理产生的副产物,属于危险废物。提出了利用高温高炉熔渣处理不锈钢酸洗污泥的技术思路,有望实现不锈钢酸洗污泥的资源化利用。采用半球法测定不同配比酸洗污泥加入高炉渣中的熔点,结合FactSage绘制相图分析熔点变化的原因,并将制备的高炉渣微粉与425硅酸盐水泥按照一定比例掺混制备胶砂砌块。结果表明,熔渣熔点随着污泥配比增加而升高。随着不锈钢酸洗污泥配比的增加,熔渣CaO含量减少,导致熔渣熔点升高。不锈钢酸洗污泥中CaSO_4等无机盐对高炉渣微粉制备过程起到了无机助磨作用。当不锈钢酸洗污泥掺加比例由0提高至5%时,高炉渣微粉的比表面积从379.70 m^(2)/kg提高至415.28 m^(2)/kg,胶砂砌块的7 d活性指数从79.45%提高至89.94%,28 d活性指数从94.64%提高至99.96%,均达到了S95矿渣微粉的要求。最后,以容积为1 680 m~3的高炉为例,提出了利用高炉熔渣处理不锈钢酸洗污泥工业应用的初步设计,并进行了热量平衡计算。在考虑热损失和保证高炉渣不发生结壳现象的条件下,高炉熔渣富余的热量可以处理11.28%的不锈钢酸洗污泥,这为不锈钢酸洗污泥的工业应用提供了技术指导。Stainless steel pickling sludge is a by-product of pickling and passivation of stainless steel in the production process of stainless steel,which is a hazardous waste.The paper proposes a technology of using blast furnace molten slag to treat stainless steel pickling sludge,which is expected to realize the resource utilization of stainless steel pickling sludge.The melting point temperature of pickling sludge added to blast furnace slag with different proportions was determined by hemispherical method,and the reasons for the change of melting point temperature were analyzed by drawing phase diagram with Factsage,and the mortar blocks were carried out by the ground granulated blast furnace slag(GGBS)mixed with 425 Portland cement.The results showed that,the melting temperature of molten slag increases with increasing sludge ratio.With the increase of the ratio of stainless steel pickling sludge,the CaO content of the slag decreases and the melting point temperature increases.Inorganic salts such as CaSO4 in stainless steel pickling sludge play an inorganic grinding role in GGBS.When the proportion of stainless steel pickling sludge is increased from 0 to 5%,the specific surface area of GGBS increased from 379.70 m2/kg to 415.28 m2/kg,the 7-day activity index of mortar blocks increased from 79.45%to 89.94%,and the 28-day activity index increased from 94.64%to 99.96%,and all of them met the requirements of S95 GGBS.Finally,the industrial application of blast furnace slag treatment of stainless steel pickling sludge was preliminarily designed based on the blast furnace with volume of 1680 m3.According to the heat balance calculation,the excess heat of blast furnace slag can treat 11.28%of stainless steel pickling sludge under the conditions of considering heat loss and ensuring that no crusting occurs in blast furnace slag,which provides a technical guidance for the application of stainless steel pickling sludge.

关 键 词：不锈钢酸洗污泥 高炉熔渣 热力学计算 高炉渣微粉 胶砂砌块 

分 类 号：X757[环境科学与工程—环境工程] X76