XVI ReuniÃ³n CientÃfica de la Sociedad EspaÃ±ola de Arcillas - Libro ...

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Comunicaciones SEA 2001 – Baeza (Jaén) SOCIEDAD ESPAÑOLA DE ARCILLAS RELATIONSHIP BETWEEN WALL FORMATION RATE AND FILTRATION RATE IN KAOLINS Ferraz E a , Coroado J a , Gomes C a , Marques J c , Rocha F a a Dpto. de Geociencias. Universidade de Aveiro. Portugal. b Instituto Politécnico de Tomar. Escola Superior de Tecnologia de Tomar. Portugal. c Centro Tecnológico da Cerâmica e do Vidro. Coimbra. Portugal. The Wall Formation Rate is a parameter of paramount importance in whiteware ceramics. However its assessment do not provide, in many cases, reproducible values. The goal of the present work is to correlate the Wall Formation Rate (WFR) with Filtration Rate (FR) for several commercial kaolins. FR is a simple and efficient parameter that can be achieved rapidly and without ambiguity using a filter press. Our proposal is to replace, in industrial plants, the WFR method by the FR method, in order to have a procedure able to yield reproductive FR values directly proportional to WFR values. The experimental results herein disclosed show a very good positive linear correlation (R 2 =0.97) between WFR and FR methods. Introduction For WFR determinations a plaster mould was used. WFR is a parameter commonly used in whiteware ceramics, however experience points out for several problems, such as: maximum number of plaster use (as a rule, 30-40); water saturation (even after plaster drying at low temperature); saturation of fine pores by the slip casting; and the difficulty of dismoulding due both to the wrinkles and the rugosities formed in the mould bottom. For FR determinations a filter press apparatus was used that avoids the inconveniences referred to for WFR determinations.
Ferraz E et al. / Comunicaciones SEA 2001 – Baeza (Jaén) Materials and methods In the experimental work being carried out several residual and sedimentary commercial kaolins from Portugal and England. Also, a kaolinitic red clay and a ball clay from Portugal were used. Wall Formation Rate determinations were carried out according to CTCV (Centro Tecnológico da Cerâmica e do Vidro) internal procedure and Filtration Rate determinations were carried out according to American Society for Testing and Materials C866-77 norm. WFR was determined using cilindrical plaster moulds (plaster/water=1.2 wt/wt), about 8 cm high and 10 cm wide, with an internal conical hole, about 4.5 cm of top diameter, 5 cm of height and 3.5 cm of bottom diameter. The casting time was: 2, 5, 7 and 9 minutes. The slip casting used in both methods was prepared with the following characteristics: density 1,550 g/L, viscosity 500 cP. The slip was dispersed with sodium silicate (50% wt/wt). Results and discussion Both properties, wall formation rate and filtration rate, are dependant of the same textural and mineralogical parameters, therefore it is appropriate to establish a relationship between them. The table 1 contains both WFR and FR values.
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XVI Reunión Científica de la Soci
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COMUNICACIONES DE LAS SESIONES CIEN
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Mineralogía de arcillas de leptoso
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I. CRISTALOQUÍMICA
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II. GEOLOGÍA Y GÉNESIS
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III. MINERALOGÍA DEL SUELO
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