 In this study, various tests were conducted on iron or tailings, IOTs, to examine their mineralogical characteristics, grindability, particle morphology, particle size distribution, and environmental leaching toxicity. Results showed that the IOTs contained 14.54% iron, most of which was stored in magnetite and pyrite. Additionally, the grindability of IOTs was much better than that of granulated blast furnace slag, GBFS. After grinding for 140 minutes, the mass fraction of IOTs particles with a particle size smaller than 5 microns increased to 44.19%, making them suitable for use as fillers in cement powder-packed structures. Furthermore, IOTs also contained a large number of sub-micron and nanoscale particles, suggesting they have potential applications in environmental remediation. This article was authored by Chang Long Wang, Jin Lin Jing, Yang Qi, and others. We are article.tv, links in the description below.