Browsing by Subject "iron oxides"

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Access status: Restricted ,
Sorpcja ołowiu na naturalnych i modyfikowanych termicznie rudach darniowych
(Data obrony: 2017-10-23) Nowak, Andżelika
Wydział Geologii, Geofizyki i Ochrony Środowiska
In this study, sorption of lead on natural and thermal modified bog iron ores was investigated. The ores of different lithologies, phase composition and textural parameters were selected and annealed at 200 and 400°C. The samples were characterized using XRD, SEM+EDS, thermal analyses and low temperature nitrogen sorption measurements. The magnitude of lead sorption was investigated depending on the concentration of the stock solution, its pH and the time of the adsorbent contact with the adsorbate. Batch sorption experiments showed that the sorption and desorption values are closely related to the phase composition, material modification and initial metal concentration in solution. The most effective sorption was obtained for natural bog iron and the lowest concentrations of the starting solution. The sorption isotherms have been fitted to the Langmuir model. It has also been observed that the sorption efficiency has increased with increasing pH of the solution. The kinetics of the Pb(II) bonding by bog iron ores has been described by the pseudo-second order equation.
Access status: Open Access ,
The formation, properties and use of dispersed iron-graphite metallurgical waste
(AGH University Press, 2022) Dan, Leonid; Maslov, Vladimir; Trofimova, Larisa Alekseevna; Cios, Grzegorz
Dispersed wastes containing graphite, iron, and its oxides, getting into the air and accumulating in landfills, cause serious harm to human health and the environment. Moreover, even if the issue of the localization of these wastes has been solved successfully, their disposal has not yet been fully organized. In the present study, a systematic analysis of the dispersed iron-graphite waste (IGW) conditions for the formation at metallurgical enterprises, their structure, and their properties were carried out. In this case, special attention is focused on the electrophysical properties: specific saturation magnetization and volume resistivity. The presence of magnetic properties in IGW, combined with low electrical resistivity, makes IGW a promising and inexpensive raw material for obtaining cheap composite materials with radio shielding and radio absorbing properties in the microwave range. As a result of the research, effective ways of improving the magnetic properties of IGW by high-temperature treatment were obtained. The practical result of the research was the development and implementation of a technological scheme of dispersed IGW complex processing, which makes it possible to solve a twofold task - to exclude the ingress of iron-graphite wastes into the environment and to obtain a cheap material for protection against microwave radiation.
Access status: Open Access ,
Trwałość spawanych miejsc aluminotermicznie
(Bibljoteka Akademji Górniczej, 1926) Feszczenko-Czopiwski, Iwan