Journal of Casting & Materials Engineering
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ISSN 2543-9901
Issue Date
2019
Volume
Vol. 3
Number
No. 2
Description
Journal Volume
Journal of Casting & Materials Engineering
Vol. 3 (2019)
Projects
Pages
Articles
New computer method of derivative thermal express analysis of cast iron for operational prediction of quality of melts and castings
(AGH University of Science and Technology Press, 2019) Zaharčenko, Eduard Volodimirovič; Sirenko, Ekaterina; Gončarov, Oleksandr; Bogdan, Oleksandr; Burbelko, Andriy A.; Kawalec, Magdalena
This method is based on the determination of similarity criterion $\overline{Z}$ as the average temperature difference between the reference and analyzed curves in the solidification region. The purpose of this work is to describe the thermal express-analysis (TDA) device created by us and the substantiation of the reliability and sensitivity of the results of the new method, including the definition of a two-sided confidence interval using Student's t-test. The error of the method was determined with the Student's criterion taken into account. The high sensitivity of the method to the metallurgical prehistory of the gray and white cast iron melts was confirmed. The method has been successfully tested under laboratory and experimental-industrial conditions on induction melting cast iron. The new method uses a disposable environmentally friendly submersible steel sampler with a heat-resistant coating inside and out. The method allows for the quick adaptation to the conditions of specific foundries (especially with the frequent changes of classes and types of cast iron) due to replenishing the database of the reference samples. The basic features of the new method are its universality, self-adaptability, speed, relative simplicity, and high sensitivity to the metallurgical prehistory of molten iron.
Recycling of dispersed metal wastes in rotary furnaces
(AGH University of Science and Technology Press, 2019) Rovin, Sergej Leonidovič; Kaliničenko, Aleksandr Sergeevič; Rovin, Leonid Efimovič
The recycling of dispersed metal containing wastes is a considerable problem, as their accumulation in dumps today is commensurate with the volume of ore extraction. Several methods and technologies are developed to recycle metal containing wastes but almost all of them require the preliminary preparation of wastes resulting in an increased price of the recycled metals. Furthermore, it is especially difficult to recycle dispersed multicomponent wastes and, therefore, the problem of developing effective, flexible and reliable technology for recycling of dispersed metal containing wastes is still a pressing one. The article presents an alternative method of recycling dispersed iron-containing wastes based on a continuous solid-liquid process of iron oxides reduction in rotary tilting furnaces (RTF). The new method allows the processing of waste of almost any composition and state: from metal lumps to oxide and multicomponent (chips, scale, sludge, etc.) wastes, contaminated with moisture, oils, organic impurities without their preliminary preparation (cleaning, homogenization, pelletizing, etc.). The result of recycling is the production of cast iron or steel ingots or required casting alloys. Some features of technology are considered, including the gas flow and motion of charge metal particles within the RTF. Process parameters providing high metal output are established.