Development of glass-ceramics from combination of industrial wastes with boron mining waste
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- Tez No: 400963
- Danışmanlar: DR. ARTURO SALOMONI
- Tez Türü: Doktora
- Konular: Metalurji Mühendisliği, Metallurgical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2013
- Dil: İngilizce
- Üniversite: Alma Mater Studiorum Universita di Bologna
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 136
Özet
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Özet (Çeviri)
This thesis was aimed to develop efficient utilization methods for highly produced waste materials using glass-ceramic technology. Glass-ceramic materials feature a great potential for environmental clean-up, since they may combine waste stabilization and valorization. In present research, considering the main aim of the thesis, as environment friendly waste utilization, energy consumption was also noticed, in order support environment respecting production techniques. For this concern a controlled fast heating rate, ranging between 40ºC min-1 to 2 ºC min-1 was applied to studied waste mixtures. The borate mineral wastes obtained through boron mines and enrichment plants were selected to be the constant starting material in all performed studies. Borate mineral wastes contain high amount of B2O3, a very wellknown glass forming oxide with a large scale of application areas, also providing lower sintering temperatures. The utilization of borate mineral wastes with glass-ceramic technology was first time studied and primarily not investigated combinations of wastes were incorporated into the research. These wastes consist of; soda lime silica glass, meat bone and meal ash and fly ash. In order to investigate possible and relevant application areas in ceramics, kaolin clay, an essential raw material for ceramic industry was also employed in some studied compositions. Different proportions prepared according to the objected glass-ceramic ternary systems such as; B2O3–P2O5–SiO2 (borophospho- silicate) and SiO2-Al2O3-CaO (wollastonite). In order to determine cytotoxicty, cell toxicity analyses applied to some of the studied products, in order to see the effect of boron (a regular daily intake element) in glass structure. As a result, three different glass-ceramic articles obtained by using powder sintering method via individual sintering processes. Light weight micro porous glass-ceramic from borate mining waste, meat bone and meal ash and kaolin clay was developed. In some compositions in related study, soda lime silica glass waste was used as an additive providing lightweight structure with a density below 0.45 g/cm3 and a crushing strength of 1.8±0.1 MPa. In another study within the research, compositions respecting the B2O3– P2O5–SiO2 glass-ceramic ternary system were prepared from; borate wastes, meat bone and meal ash and soda lime silica glass waste and sintered up to 950ºC. Low porous, highly crystallized glass-ceramic structures with density ranging between 1.8 ± 0,7 to 2.0 ± 0,3 g/cm3 and tensile strength ranging between 8,0 ± 2 to 15,0 ± 0,5 MPa were achieved. Lastly, diopside - wollastonite glass-ceramics (SiO2-Al2O3-CaO) from borate wastes, fly ash and soda lime silica glass waste were successfully obtained with controlled rapid sintering up to 950 and 1050ºC. The wollastonite and diopside crystal sizes were improved by adopting varied combinations of formulations and heating rates.The properties of the obtained materials show; the products with a uniform pore structure could be useful for thermal and acoustic insulations and can be embedded in lightweight concrete where low porous glass-ceramics can be employed as building blocks or additive in cement and ceramic industries.
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