Abstract
We studied kinetic patterns of hydrogen reduction of the scale of a nickel-cobalt containing precision alloy at a temperature of 673‒1573 K over a period from 0 to 180 minutes. The highest degree of reduction was achieved after thermal treatment at 1273 K – 99 %. This is predetermined by the intensification of reduction processes and a sufficient level of porosity, which ensures satisfactory gas exchange. It was discovered that the starting scale consists mainly of Fe 3 O 4 , Fe 2 O 3 and FeO with atoms substituting their alloying elements. The target product of metallization had a sponge-like microstructure and consisted mainly of the solid solution of Co and Ni atoms in γ-Fe and the residual non-reduced Fe 3 O 4 and FeO. The resulting phases had no noticeable susceptibility to sublimation. This has ensured a reduction in the losses of alloying elements while receiving and using the highly-alloyed metallized scale, which was confirmed by experimental- industrial tests. At the same time, recycling of industrial wastes contributes to a reduction in the technogenic intensity of industrial regions and improves ecological safety of the environment
Highlights
Recent years have seen increased demand for steel, alloyed with rare and refractory elements, in particular, Ni andCo
6/10 ( 90 ) 2017 loyed technogenic waste back to production. These include the scale of nickel-cobalt containing precision alloys
Based on the above mentioned, it is a relevant task to comprehensively study the kinetics of hydrogen reduction of the scale of a nickel-cobalt containing precision alloy, as well as the phase composition and microstructure of metallization products
Summary
Recent years have seen increased demand for steel, alloyed with rare and refractory elements, in particular, Ni and. 6/10 ( 90 ) 2017 loyed technogenic waste back to production These include the scale of nickel-cobalt containing precision alloys. The specific feature of this type of waste is a high alloying degree. This necessitates taking into consideration the complex nature of physical-chemical interaction between elements when designing technological conditions for recycling. The application of solid-phase reduction is safer ecologically since it requires lower temperatures and energy consumption. In other words, it ensures a relatively smaller emission of gaseous products of reactions into the environment. Achieving positive results in addressing this challenge is possible by replacing the resource- and energy-intensive smelting technologies of refractory alloying materials with modern methods of solidphase metallization in powder metallurgy
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Eastern-European Journal of Enterprise Technologies
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
