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Marcello RomagnoliDipartimento di Ingegneria dei Materiali e dell’Ambiente
Università di Modena e Reggio Emilia, Via Vignolese 905, 41100 Modena (Italy) Email: [email protected]
Tel. 059 2056234Skipe: romagnoli_marcello_office
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Introduction
Effetti Combinati
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Composizione della fase solida
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Caratteristiche chimiche e mineralogiche delle materie prime.
• Caolino => Montmorillonite• Presenza di impurezze nelle materie prime• Capacità di scambio cationico• Percentuale di sostanze organiche
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Composizione della fase solida
31La reologia dei materiali ceramici- Faenza Editrice
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Composizione della fase liquida
31 5/38
Presenti nell’acqua
Dalle materie primeConcentrazione
e natura degli ioni
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Composizione della fase liquida
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- H+
Ca2+
Al3+
Ba2+
Mg2+
Serie di Hofmeister
Na+
Li+NH4+
Ca2+Mg2+
Ba2+
Al3+
K+
H+
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Composizione della fase liquida
Controlli
Rapidi:o pHo Conducibilità
Approfonditio Analisi chimica
� Elettrodi iono-sensibili (continue)� Analisi in emissione e assorbimento (continue e
discontinue)� Analisi colorimetriche (discontinue)
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Composizione della fase liquida
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PotenzialeZeta alto
PotenzialeZeta basso
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Additivi
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Additivi
www.adoptic.eu
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Additivi
www.adoptic.eu
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Invecchiamento
Le sospensioni vanno considerate come sistemi non stabili nel tempo, ovvero in grado di modificare le loro caratteristiche reologiche nel tempo.• Reazioni chimiche• Processi microbici• Processi fisici
Controllo reologico in funzione del tempo (0-7 gg)
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Invecchiamento
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Contenuto di solido
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Contenuto di solido
• Aumento del limite di scorrimento• Comparsa della dilatanza, viscoelasticità• Interazione con la distribuzione
granulometrica e la morfologia delle particelle
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Contenuto di solido
Howard A. Barnes, “A HANDBOOK OF ELEMENTARY RHEOLOGY”, The University of Wales Institute of Non-Newtonian Fluid
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Distribuzione granulometrica
H.A.Barnes,J.F.Hutton, K.Walters, “An introdution to Rheology”, Elsevier, p123
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Distribuzione granulometrica
A parità di contenuto solido la presenza di particelle a dimensione diversa consente un maggiore volume di acqua disponibile a fluidificare
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Distribuzione granulometrica
• Particelle molto fini coordinano attorno a se un maggior numero di molecole di acqua. Queste ultime non sono meno disponibili alla fluidificazione
• Una macinazione spinta favorisce la solubilizzazione di materie prime contenente cationi flocculanti
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Distribuzione granulometrica
Eq. AndreasenEq. Funk-Dinger
Dove:CPFT = Cumulative Percent Finer Than; D = particle size; DL = largest particle size; and n = distribution modulusDs = finite smallest particle size
Metodi sperimentali (es. DOE o NN)
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Morfologia
Particelle sferiche, a parità delle altre condizioni, permettono di ottenere viscosità più basse
Howard A. Barnes, “A HANDBOOK OF ELEMENTARY RHEOLOGY”, The University of Wales Institute of Non-Newtonian Fluid
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Morfologia
Particelle sferiche, a parità delle altre condizioni, permettono di ottenere viscosità più basse
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Temperatura
In generale la temperatura viene considerata come una variabile in grado di diminuire la viscosità di un sistema.
Agisce sopratutto sulla viscosità della fase liquida.
Se induce modifiche nel sistema, la sua influenza può essere disegno diverso.
Es.• Evaporazione della fase liquida• Solubilizzazione di Sali contenuti nel solido• Fenomeni di polimerizzazione da parte di additivi• Reazioni chimiche favorite dalla temperatura
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Temperatura
Effetto della temperatura sulla solubilità di alcuni sali
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Temperatura15°C
35°C
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Temperatura15°C
35°C
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Reometria
0
Stoccaggio in vasca
50
Atomizzazione
MacinazioneScarico dal mulino
100 1000 s-1
Stoccaggio nel mastello
Applicazione a campana
Aerografo
Applicazione a disco
Serigrafia
Valori indicativi
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Reometria
La corretta scelta dello strumento di misura e della procedura è una regola aurea per il controllo della reologia.
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Conclusione
Individuare i parametri con maggiore effetto sulla reologia del sistema.
Mantenerli monitorati con metodi sufficientemente sensibili.
Costruzione di modelli predittivi.
Mantenere il controllo e aggiornare I modelli.
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