Effect of Temperature on the Co-production of Copper Slag and Middle Low-grade Phosphate Rock

Ferro-phosphorus is an important industrial alloy, which plays a pivotal role in steelmaking, chemical industry, new energy and construction industry. The development and utilization of ferro-phosphorus can not only bring economic benefits to enterprises, but also contribute to the development of national economy. In this paper, the experiment was carried out under the conditions of T=1200℃-1400℃, R(CaO/SiO₂)=1.0, t=60 min and C=12%. Phosphate rock and copper slag were used as raw materials, graphite was used as reducing agent, and ferrophosphorus was produced by reduction and roasting in a high-temperature energy-saving tubular furnace. The reduced samples were separated and ground, XRD, SEM and EDS were used to characterize ferrophosphorus and slag. The results showed that the main phase of ferrophosphorus obtained is Fe₃P at T<1300℃, and the main phase of ferrophosphorus obtained is Fe₃P and Fe₂P at T>1300℃. After reduction, it was measured that the main component of the slag was silicate, mainly calcium metasilicate (CaSiO₃) and a small amount of aluminum silicate.