Basic research on copper slag modification, magnetic separation and preparation of ceramics from magnetic separation tailings

Copper slag is difficult to be used efficiently. Thus, a new technology was proposed to improve the magnetic separation rate of solidified copper slag and further prepare the magnetic separation tailings slag as ceramic material by using red mud as the modifier in the process of discharge of molten copper slag, and to further prepare magnetic separation tailings into ceramic materials. In this paper, different amounts of red mud were added into copper slag, the magnetic iron powder and tailings ceramic products were obtained by melting, cooling, magnetic separation and tailings ceramic technical. Through XRD, SEM and other methods, the effect of red mud on the magnetic separation of iron-containing components of copper slag, and the performance and mechanism of ceramic materials prepared by magnetic separation tailings were studied. The results showed that the addition of red mud promotes the crystallization and growth of magnetite in slag. When the amount of red mud was added 20%, the recovery rate of the modified slag magnetic separation fine powder reached 84.0%, of which the iron grade reached 52.5%, and the iron grade increased by 7.4% compared with unmodified copper slag. After magnetic separation, the tailings can further produce ceramics with excellent performance. The main crystal phases are hematite, magnetite and pyroxene. The sintering temperature is 1070℃ which is about 100 ℃ lower than that of unmodified copper slag. The water absorption rate is 0.67%, and the flexural strength is 65.4 MPa.