Copper ferrite obtaining from microelectronics waste

Relevance. The need to develop new methods for metal waste disposal. This direction, with the participation of various intensifying influences, refers to resource-saving, technological, minimizing the volume of capital costs for raw materials, production and subsequent sale. Aim. To obtain copper ferrite from iron and copper waste of microelectronics. Copper ferrite is a useful and highly demanded product in this branch of domestic industry, especially now, when many sanctions have been imposed on our country, including in terms of microelectronics. To study its magnetic properties and draw a conclusion about the possibility of its application. Objects. Samples of iron and copper waste in the form of plates, wire and shavings. Methods. Volumetric analysis, electron microscopy, X-ray phase analysis, study of magnetic susceptibility. Results. The authors have produced finely dispersed iron (III) oxide from iron-containing microelectronics waste. This oxide is used in electrical engineering as part of high-voltage resistors for grounding the neutral of networks, lithium-ion batteries, as a carrier of analog and digital information. In the radio engineering industry it is used as part of low-voltage resistors, high-frequency chokes, small-sized pulse transformers. The authors produced finely dispersed copper (II) oxide from copper-containing waste. This oxide is used in production of phosphors and dry batteries – in batteries with liquid cells as a cathode, with lithium as an anode and dioxalane mixed with lithium perchlorate as an electrolyte. In addition, it finds application as a p-type semiconductor, since it has a narrow bandgap of 1.2 eV, and manufacturing photovoltaic cells in solar panels. Copper ferrite was synthesized from the obtained oxides by sintering. Rings made of such alloy serve as a core in transformers. The part increases the magnetic field strength by several thousand times, making the devices transmit more power than they could with a non-ferrite core. Ferrite ring cores are found not only in transformers, but also in other electronics (e.g. magnetic memory)

COMPARATIVE ANALYSIS OF PHYSICO-CHEMICAL METHODS FOR PROCESSING ALUMINUM WASTE

The relevance of the study is caused by the need to develop new methods for the disposal of metal waste. This direction, with the participation of various intensifying influences, refers to resource-saving, technological, minimizing the volume of capital costs for raw materials, production and subsequent sales. Purpose: to study physical and chemical methods for alkaline and acid processing of aluminum waste in the field of ultrasound, consider the mechanisms of these processes, compare kinetic characteristics, identify the pros and cons of the methods, and, based on a comparative analysis, conclude which of the methods is the most effective. Objects: samples of aluminum waste in the form of plates and shavings. Methods: volumetry, sonochemical synthesis, evaluation and analysis of the kinetic curves of the process at different temperatures, X-ray phase analysis. Results. The analysis of kinetic curves, rate constants of processes at different temperatures, and orders of chemical reactions has been carried out. The values ​​of the activation energies of the target chemical reactions and the characteristics of the kinetic regions of the processes were compared with each other. Despite the long induction period, the kinetic potential of acid processing of aluminum waste turned out to be 2 times higher than that of alkaline processing at temperatures of 313–323 K. Ultrasonic radiation did not significantly affect this characteristic, although it reduced the induction effect by 2 times. The mechanisms of the ongoing sonochemical processes in these methods turned out to be very similar to each other, no fundamental differences were observed. The products obtained during chemical processing in the form of hydrogen, hydroxide, chloride and aluminum orthophosphate are currently in high demand in the energy, chemical and silicate industries, as well as in medicine