Name: DAINA BOURGUIGNON CAMPOS DE OLIVEIRA
Publication date: 05/09/2023
Examining board:
Name |
Role |
|---|---|
| EDNILSON SILVA FELIPE | Advisor |
Summary: The ornamental stone sector is responsible for generating a large amount of waste
throughout the world. These wastes are rich in oxides that can be used as raw
materials in the manufacture of glass. In general, they have a high concentration of
SiO2, an oxide that forms a glass network. From this perspective, this work aimed to
develop lead glass, also known commercially as lead crystals, from the use of silicate
wastes from ornamental stones processed on diamond multiwire looms, as well as
characterizing the waste and glass produced. The methodology used was
fusion/cooling. The maximum process temperature was 1500°C with a time of 3
hours. The results of this work were the development of two glasses using granite
and quartzite wastes, adding lead in the form of lead monoxide and other carbonates
in sufficient quantities to adjust the typical compositions of the necessary oxides. All
results were compared with a commercial glass sample. X-ray diffractions (XRD)
showed complete vitrification of the glasses produced; FRX showed characteristics
similar to the lead crystal glass pattern; the densities presented approximate values
and the hydrolytic resistance was classified as average in the two glasses produced,
according to the ISO 719 standard. The iron content present in the glass produced
with granite resulted in a glass with a greenish color, while the quartzite glass
presented a bluish color, most likely, due to the titanium oxide present in its
composition. It was concluded that there is technical feasibility in the production of
glass using ornamental stones waste to replace silica from sand.
