不锈钢酸洗污泥与AOD渣协同制备硅酸盐水泥的研究  

Study on collaborative preparation of portland cement with stainless steel pickling sludge and AOD slag

作　　者：许香帅 赵峥 张延玲 XU Xiangshuai;ZHAO Zheng;ZHANG Yanling(State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083

出　　处：《炼钢》2022年第5期82-88,共7页Steelmaking

基　　金：国家“十三五”重点专项资助项目(2019YFC1905701);国家自然科学基金钢铁联合基金资助项目(U1960201)。

摘　　要：AOD渣主要矿物相为CS和CS,具备潜在的胶凝活性。不锈钢硫酸酸洗过程会产生大量的酸洗污泥,其中含有高含量的CaSO,因此可能存在与石膏相似的缓凝剂作用。以高温烧制后的AOD渣和酸洗污泥为原料制备水泥胶凝材料,利用XRD、SEM分析所制胶凝材料的矿物组成及微观结构,利用TG-DTA分析其水化机理,通过抗压测试和ICP等手段分析其抗压强度及铬的固化性能。结果表明:酸洗污泥可以在水泥水化过程中发挥缓凝剂的作用,有效调控水化过程初凝及终凝时间;调质后的AOD渣所制备的水泥28天抗压强度最高可达109.61 MPa,满足PC42.5水泥的强度标准;所制备的水泥浆体材料可以有效降低铬的浸出,使其低于危险废弃物中铬的浸出标准。The main mineral phases of AOD slag are CS and CS,which have potential cementitious activity. Stainless steel sulfuric pickling process will produce a large amount of pickling sludge, which contains a high content of CaSO, so there may be a retarder similar to gypsum. The cement cementitious material was prepared from AOD slag after high-temperature firing and pickling sludge. The mineral composition and microstructure of the cementitious material were analyzed by XRD and SEM, the hydration mechanism was analyzed by TG-DTA, and the compression resistance and chromium curing properties were analyzed by means of compression test and ICP respectively. The results showed that the pickling sludge could play the role of retarder in cement hydration, and effectively regulated the initial and final setting time. The 28 day compressive strength of AOD-slag cement could reach 109.61 MPa, which met the strength standard of PC42.5 cement. The cement slurry material could effectively reduce the leaching of chromium and make it lower than the leaching standard of chromium in hazardous waste.

关 键 词：AOD渣 酸洗污泥 硅酸盐水泥 水化 抗压强度 铬浸出 

分 类 号：X757[环境科学与工程—环境工程]