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Wyszukujesz frazę "chemical elements" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Backfill of a Mined-Out Gold Ore Deposit with the Cemented Rubber-Cord and Waste Rock Paste: Environmental Changes in Aqueous Media
Autorzy:
Danilov, Alexander
Korelskiy, Denis
Matveeva, Vera
Horttanainen, Mika
Powiązania:
https://bibliotekanauki.pl/articles/1955427.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
filling mixture
backfill mixture
physical properties
chemical properties
elements migration
waste utilization
mined-out space filling
Opis:
Assessment of the dynamics of changes in the physical and chemical properties and morphological composition of the filling mixture as well as the identification of the elements capable of migrating into the environment is an important part of assessing the environmental efficiency of such an environmental measure during the filling of mined-out space of an ore deposit. During scientific research, the environmental safety mined-out space filling technology at the gold ore deposit by the mixture of rock waste, cement and crushed car tires was investigated. The authors carried out a set of laboratory studies and created a physical model of groundwater infiltration. Under laboratory conditions, this model allowed the experiment to evaluate the migration of elements and substances from the filling mixture into the environment to assess the risks of secondary pollution. The potential hazard of element migration from the backfill mixture into the environment was determined as a result of testing the backfill mixture on a bench with washing using the model solution that emits drainage water. During research, it was revealed that under the conditions of an ore deposit, the filling mixture components transformation would not lead to hazardous hydrochemical and hydrogeochemical areas or pollution stream formation.
Źródło:
Journal of Ecological Engineering; 2021, 22, 7; 190-203
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technological and ecological safety in aspect of chemical properties of recycled neodymium magnets – electric motors and hard disk
Autorzy:
Kapustka, K.
Ziegmann, G.
Klimecka-Tatar, D.
Powiązania:
https://bibliotekanauki.pl/articles/111885.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
neodymium magnets
rare earth elements
chemical properties
hard disk
electric motors
magnesy neodymowe
dysk twardy
silniki elektryczne
proszek magnetyczny
Opis:
Neodymium magnets currently dominate the magnet market due to their superior magnetic properties with maximum volume minimization. In this paper, the results of X-ray analysis for two types of magnetic powder obtained from the recovered magnets traditionally used in electric motors and hard disk have been presented. The NdFeB magnets are composed of 25-35 wt.% rare earth elements (RE) and the rest being transition metals (mainly Fe.). RE, other than Nd, such Dy, Pr, Tb and Gd or exogen elements, other than Fe, such as Al, Co, Ga, Nb, Si, Cu and Zr can also be present as minor admixtures. This paper brings an opportunity to introduce the hard magnets recycling technology on an industrial scale.
Źródło:
Production Engineering Archives; 2017, 17; 37-40
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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