Adding Ferronickel Concentrate To Strengthen The Reduction Roasting Of Silicon-magnesium Laterite Nickel Ore

Nickel is an important metal in modern industry and technology.Because of its excellent physical and chemical properties,it has been widely used in stainless steel,heat-resistant alloy and energy storage system.Nickel resources are mainly in the form of nickel sulfide ore and laterite nickel ore,among which laterite nickel ore accounts for about 70% of the total nickel reserves in the world and nickel sulfide ore only accounts for 30%.At present,China's nickel resources mainly com e from the exploitation of nickel sulfide resources.With the rapid development of global economy,the demand for nickel is increasing,nickel sulfide resources are consumed rapidly,and the development and utilization of laterite nickel ore with rich rese rves is imminent.Based on the analysis of chemical elements,X-ray diffraction and electron scanning electron microscopy,the mineral composition,pore structure and phase composition of Yuanjiang laterite nickel ore are determined,and the phase change r ule in the process of programmed temperature rise is studied in detail.The distribution rule and characteristics of nickel in the ore are obtained.The results show that the original mineral phase contains the coalescence The chrysotile of crystal water i s dominant,and the nickel in silicate is in the form of isomorphism.In view of the unique mineral composition and complex ore phase structure of low-grade silicon magnesium laterite nickel ore,a method of enriching ferronickel with low-grade laterite nickel ore is proposed in this study.The ferronickel concentrate is added to the low-grade laterite nickel ore powder as an additive,and the reducing agent is added and the reduction roasting is carried out.The experimental parameters are studied.The results show that the grades of nickel and iron in the magnetic separation products are 8.62% and 80.11% respectively,and the recoveries of nickel and iron are 98.76% and 82.35% respectively.XRD analysis of magnetic separation products showed that the main phase of magnetic separation products was Ferronickel,followed by olivine.It is found that the addition of ferronickel concentrate changes the reaction path of nickel and iron oxides,promotes the structural damage of chrysotile and the formation of spinel,and the formation and strengthening of ferronickel spinel,which is easier to be reduced than nickel and iron oxides,makes the target components gather effectively before reduction,and is beneficial to ferronickel Alloy formation and polymerization.According to the SEM analysis results,under the condition of adding ferronickel concentrate,the ferronickel particles in the calcine aggregate and grow up,which is conducive to magnetic separation and recovery.Through the study on the migration behavior of ferronickel particles in the raw ore under the action of adding ferronickel concentrate,the results show that the added ferronickel concentrate can attract ferronickel particles in the raw ore,promote the aggregation and growth of ferronickel particles,and form large ferronickel alloy particles.