Whether steel slag or printing and dyeing wastewater not only pollutes the environment but also occupies a lot of land. In this paper, steel slag is pretreated by acid leaching method at normal temperature and pressure to obtain chlorinated steel slag solution system. Then the system is electrolyzed by an electrochemical membrane method to obtain polymetallic carbonate precipitation. The electrolytic product is used as a precursor to obtain polymetallic oxide by calcination. Simulated dye wastewater was degraded with hydrogen peroxide as oxidant and polymetallic carbonate and its oxide as the photocatalysts, and their catalytic performances were compared. The degradation rates of Ca/Mg/Fe/Al/Mn/Ti/CO₃ and Ca/Mg/Fe/Al/Mn/Ti/O catalysts were 3.05 times and 2.91 times higher than that of the blank catalyst, respectively. Ca/Mg/Fe/Al/Mn/Ti/O showed the best degradation efficiency and the removal rate of MB is as high as 99.56% after 80 min of illumination. Considering that the material is derived from low-cost solid steel scrap slag, it can not only treat wastewater but also solve the problems of harmful accumulation of solid waste, so the prepared materials are environmentally friendly and economic photocatalytic materials for printing and dyeing wastewater.

无论是钢渣还是印染废水，不仅污染环境，而且占用大量土地。本文采用常温常压酸浸法对钢渣进行预处理，得到氯化钢渣溶液体系。然后通过电化学膜法对该体系进行电解，得到多金属碳酸盐沉淀。以电解产物为前驱体，通过煅烧获得多金属氧化物。以双氧水为氧化剂，多金属碳酸盐及其氧化物为光催化剂，对模拟染料废水进行降解，并比较了它们的催化性能。Ca/Mg/Fe/Al/Mn/Ti/CO ₃的降解率Ca/Mg/Fe/Al/Mn/Ti/O 催化剂分别比空白催化剂高 3.05 倍和 2.91 倍。Ca/Mg/Fe/Al/Mn/Ti/O的降解效率最好，光照80分钟后MB去除率高达99.56%。考虑到该材料来源于低成本的固体废钢渣，既可以处理废水，又可以解决固体废物有害堆积的问题，因此制备的材料是环保、经济的印染废水光催化材料。