magistrsko delo
Matej Mesarič (Author), Jože Medved (Mentor)

Abstract

Titanov dioksid je najpogosteje uporabljen beli pigment in je kot osnova prisoten v večini barv, ki se uporabljajo pri barvanju aluminijevih tub in doz. Pri pretaljevanju sekundarnih surovin, barvanih z barvo na osnovi titanovega dioksida, je zato potrebno poznati vplive različnih parametrov taljenja, saj bi v primeru redukcije titanovega dioksida v tekočem aluminiju lahko presegli dovoljeno mejo titana v talini. Cilj magistrskega dela je bil raziskati vpliv parametrov in pogojev obdelave taline in kako le ti vplivajo na morebitno redukcijo titanovega dioksida v tekočem aluminiju ter s tem na vnos titana v talino. Eksperimentalni del je bil razdeljen na dva dela, kjer smo v prvem delu v talino dodajali titanov dioksid v obliki prahu, v drugem pa po postopku reciklaže pretaljevali sekundarni material, barvan z barvo na osnovi titanovega dioksida. Pripravili smo serijo vzorcev, katerim smo spreminjali pogoje obdelave taline, temperaturo in čas zadrževanja taline, in količino dodanega titanovega dioksida. V drugi seriji smo naredili dva vzorca po postopku reciklaže. Vzorcem smo na podlagi enostavne termične analize izrisali ohlajevalne krivulje in določili karakteristične temperature. Analizirali smo kemijsko sestavo, naredili diferenčno vrstično kalorimetrijo, XRD analizo žlindre, optično mikroskopijo in z vrstično elektronsko mikroskopijo ter EDS analizo analizirali vključke. Ker pri pripravi prve serije vzorcev ni prišlo do spremembe kemijske sestave nobenega vzorca, in s tem do redukcije titanovega dioksida, smo naredili XRD analizo žlindre in tam skušali dokazati njegovo prisotnosti. Enako se je zgodilo pri seriji vzorcev narejenih po postopku reciklaže, kjer smo s pomočjo XRD analize uspeli dokazati prisotnost titanovega dioksida v žlindri. Izkazalo se je, da pri nobenem od izvedenih pogojev ni prišlo do redukcije titanovega dioksida v tekočem aluminiju in s tem vnosa titana v talino.

Keywords

titanov dioksid;alumotermična redukcija;titan;reciklaža aluminija;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL NTF - Faculty of Natural Sciences and Engineering
Publisher: [M. Mesarič]
UDC: 669
COBISS: 40047619 Link will open in a new window
Views: 421
Downloads: 134
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Other data

Secondary language: English
Secondary title: principle of titanium dioxide reduction in liquid aluminium
Secondary abstract: Titanium dioxide is the most widely used white pigment and is present as a base in majority of paints used in the painting of aluminium tubes and cans. When remelting secondary aluminium painted with paint, based on titanium dioxide, it is necessary to know the effects of different melting parameters. In the case of reduction of titanium dioxide in liquid aluminium, the acceptable limit of titanium in the melt could be exceeded. The aim of the master's thesis was to investigate the influence of parameters and conditions of melt treatment, and how they affect on possible reduction of titanium dioxide in liquid aluminium. The experimental part was divided into two sections. In the first section titanium dioxide was added to the melt in the form of powder and the second section, where the secondary material painted with paint, based on titanium dioxide, was remelted. We prepared a series of samples to which we changed the melt treatment conditions, the temperature and holding time of the melt, and the amount of titanium dioxide powder added. Based on simple thermal analysis, cooling curves and characteristic temperatures were plotted, chemical composition was analysed, differential scanning calorimetry, XRD analysis of slag, optical microscopy were performed, and inclusions were analysed by scanning electron microscope and EDS analysis. Since there was no change in the chemical composition of any sample during the preparation of the first batch of samples, and no reduction in titanium dioxide, we performed an XRD analysis of the slag and tried to prove its presence there. The same happened with a series of samples made with the recycling process, where we were able to prove the presence of titanium dioxide in slag by XRD analysis and confirm that there was no reduction. It turned out that under none of the implemented conditions there was no reduction of titanium dioxide in liquid aluminium and consequently introduction of titanium into the melt.
Secondary keywords: titanium dioxide;aluminothermic reduction;titanium;recycling of aluminium;
Type (COBISS): Master's thesis/paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Naravoslovnotehniška fak., Oddelek za materiale in metalurgijo
Pages: XVI, 60 f.
ID: 12116248