Co Resources In Waste Cemented Carbide Experimental Study On Secondary Utilization

With the continuous development of new material preparation technology,Co is widely used in cemented carbide and heat-resistant alloy,new energy batteries,pigments and magnetic materials,etc.However,due to the decrease of cobalt mineral resources on the earth and its low taste,human beings are eager to find a exellent substitute for Co resources and have better process methods to recycle and comprehensive utilize the waste Co resources.High performance Co₃O₄ is suitable for positive and negative electrode materials of new energy batteries and new super capacitor materials.Spherical or quasi spherical Co powder with large specific surface area will be suitable for preparing high performance alloy materials.In this paper,the experimental research focuses on seeking a more efficient,environmental-friendly separation process of W and Co for waste cemented carbide,and preparing better precursor through common water bath ring and microwave ultrasonic field auxiliary environment,preparing higher performance Co₃O₄ by decomposing intermediate products in common resistance furnace and micro wave muffle furnace under certain conditions,and preparing higher performance Co₃O₄ by The Co powder with finer and better morphology was prepared by reducing the precursor at different temperatures.Through X-ray diffractometer,electron scanning microscope,energy dispersive spectrometer,TG-DSC analyzer,laser particle size test station,electrochemical workstation,infrared spectrometer and other equipment for physical and chemical characterization,to find the best performance samples in all aspects to obtain the best process method in different situations and explore the preparation principle.The main conclusions are as follows:（1）Under the condition of 150℃,alkali coefficient of 1.5 and alkali boiling time of 6hours,the method of high temperature oxidation and high pressure alkali leaching can effectively separate W and co elements from cemented carbide and prepare CoCl₂ solution or crystal with required concentration;（2）Under the condition of water bath heating,the cobalt oxalate with pH value of 4,temperature of 70℃and adding active agent is thin and uniform nanowire with diameter of32-40nm and length of 30-40μm.compared with the cobalt oxalate prepared with other pH values,the distribution of cobalt oxalate is more uniform,and there is no obvious phenomenon of different length and short length and agglomeration;（3）In the joint effect of microwave and ultrasonic,microwave heating from inside to outside and high frequency ultrasonic cavitation,cobalt oxalate particles are refined to a large extent.Under the condition of 70℃and 9:1 ultrasonic time to gap ratio,Cobalt Oxalate Particles with fine size and uniform dispersion were prepared;（4）Co₃O₄ prepared by microwave thermal decomposition precursor can obtain cubic crystal system with good crystallinity,high purity,small particle size and narrow distribution.Compared with ordinary resistance furnace,Co₃O₄ has obvious advantages,low temperature and obvious energy-saving effect;（5）Through the study of the electrochemical properties of Nafion/Co₃O₄/glassycarbon electrode,the results show that Co₃O₄ powder has excellent Faraday pseudo capacitance properties.Through the comparative study of the Co powder reduced by the precursor prepared by ultrasonic-microwave field and the Co powder reduced by the precursor prepared by the general water bath,the results show that the morphology of the precursor prepared by ultrasonic microwave field and the Co powder produced by the reduction process have the same size Obvious refining effect.