|Tipo di tesi||Tesi di laurea magistrale|
|Titolo||Riciclo di amianto inertizzato per la produzione di piastrelle ceramiche e di pigmenti inorganici.|
|Titolo in inglese||Recycling of inert asbestos for the production of ceramic tiles and inorganic pigments.|
|Struttura||Dipartimento di Scienze Chimiche e Geologiche|
|Corso di studi||SCIENZE CHIMICHE (D.M. 270/04)|
|Data inizio appello||2019-12-13|
|Disponibilità||Accessibile via web (tutti i file della tesi sono accessibili)|
Per porre fine al problema amianto attraverso una soluzione tecnologicamente valida e duratura nel tempo, in questo lavoro di tesi si utilizza il prodotto KRY•AS in impasti da grès porcellanato e per la produzione di pigmenti colorati inorganici complessi (CICP).
To put an end to the asbestos problem through a technologically valid and long-lasting solution, in this thesis work we use the product KRY • AS in porcelain stoneware mixtures and for the production of complex inorganic colored pigments (CICP). The first part of the thesis focused on the preparation of KRY•AS-based ceramic frits, which will be used in porcelain stoneware mixtures. In particular, two frits were designed: the first consisting of KRY•AS, waste glass and natural raw materials and the second simply consisting of KRY • AS and waste glass. The mixtures containing the frits and the relative ceramic specimens will be characterized by technological, morphological and mineralogical analyzes. The second part of the work focused on the synthesis of complex inorganic colored pigments. In particular, studies conducted by the research group where i worked, highlighted the possibility of recycling the KRY·AS for the production of inorganic pigments, by adding appropriate chromophoric ions. In the past, silica-based pigments of the following type have been made: • uvarovite (green pigment) Ca3Cr2(SiO4)3 • malayaite (pink pigment) Ca(Sn,Cr)SiO5 The synthesis involved a preliminary treatment of KRY•AS with acid, with the aim of eliminating the iron present and favoring the inclusion of other chromophoric elements. The research behind this paper has led to the identification of the following structures, which can be implemented starting from KRY•AS through traditional synthesis methods and without preliminary treatments: • esseneite (olive green pigment) CaFeAlSiO6 • gehlenite (white pigment) Ca2Al2SiO7 • diopside (white pigment) CaMgSi2O6. Pigment synthesis will be carried out by evaluating the following parameters: firing cycle, nature of the crucible, nature and quantity of mineralizer. The pigments obtained will be characterized by mineralogical analysis and subsequently used for the whole mass coloring of the specimens.