红土镍矿还原焙烧技术研究进展OA

With the surge in demand for nickel resources,the efficient smelting technology of laterite has become the focus of research.Reduction roasting,as a key link in the pyrometallurgical smelting of laterite,can reduce nickel and iron oxides in the ore to metal or low-valence oxides,creating conditions for subsequent separation and purification.However,there are still some problems in this process,such as high energy consumption,low reduction efficiency and insufficient adaptability to complex mineral composition.In this paper,the reduction roasting technology of laterite was taken as the research object.From the perspective of thermodynamics and kinetics,the phase change and reaction law in the reduction roasting process of laterite were deeply analyzed,and the reaction mechanism and speed control steps in each stage of the reduction roasting process were clarified.On this basis,this paper compared and analyzed the smelting processes of laterite such as direct reduction roasting in rotary kiln,rotary klin-electric furnace,reduction roasting-magnetic separation and reduction roasting-ammonia leaching,and discussed the advantages and limitations of each process.It was prospected that the future development direction of laterite smelting technology should focus on the innovative breakthrough of the combined process of fire and humidity,and realize low energy consumption,low emission and synergistic extraction of nickel and cobalt through the coupling of low temperature reduction and leaching process.