| 摘要 |
<p>Provided is a method for modifying steel slag. High-temperature steel slag discharged in the final steelmaking stage is modified by using a large amount of mining tailings with low cost. 15-30 parts by weight of high alumina silicate tailings, 60-80 parts by weight of high calcium silicate tailings and 5-15 parts by weight of calcium carbonate tailings are mixed to obtain compound materials of the tailings; granulating is performed to prepare agglomerated blocks; the compound materials of the tailings are added into a steel slag pot or disc by batches according to the proportion of (70-80%):(20-30%) of the discharged steel slag and the compound materials of the tailings; the temperature of the steel slag is kept at 1200-1400°C for 30-60 min; water quenching, heat applying or heat covering is performed when the temperature is below 1200°C; breaking is performed; magnetic separation is performed. By means of the method, the separation effect of the iron slag is improved, the grindability of the steel slag is improved, the total recovery rate of the scrap steel is up to 95-100%, the components of the separated scrap slag are controllable and have high activity, and the separated scrap slag contains less than 1.5% by weight of the free calcium oxide, has the grinding work index of 14-17kw.h/t and is used to replace the silicate cement clinker.</p> |
