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Densification of Quartz Particle Beds by Tapping (pp. 143-170) $100.00
Authors:  (J.L. Amorós, G. Mallol, M.J. Orts, J. Boix, Instituto de Tecnología Cerámica (ITC), Asociación de Investigación de las Industrias Cerámicas, Universitat Jaume I. Castellón, Spain)
Quartz of different grain size is used to manufacture composite materials. One of the
most popular is “engineered stone”, made of inorganic fillers bound together by a
polymer resin, being quartz the major filler. A typical composition of engineered stone is
93% quartz and other fillers by weight and 7% resin. In order to eliminate the air of the
mixture and use as much percentage of quartz as possible it is very important a high
densification of the mixture of fillers. The purpose of this study is twofold, first to
determine how the mean particle size of monomodal quartz particle beds and the bed
preparation method affect initial and final bed apparent density and the kinetics of
densification by tapping. This work was conducted on eight quartz particle size fractions
obtained from a commercial quartz powder by sieving, each having a different mean
particle size and a very narrow (monomodal) particle size distribution. Densification
experiments were conducted on the beds obtained with each fraction, using an assembly
designed for this purpose. A kinetic model representing the densification process of
monomodal powder beds by tapping is proposed, in which good relations are obtained
between the parameters of the model and the foregoing variables. In a second step to
study the influence of the composition and mean component sizes of beds of binary
mixtures of monomodal quartz particle fractions on initial and final bed fractional bulk
densities and on the kinetics of densification by tapping. An equation is proposed that
relates initial and final bed fractional bulk densities to the mixture composition; it was
verified that these characteristics can be related using the fractional bulk densities of the
starting monomodal particle beds and an empirical efficiency factor. The kinetics of
densification by tapping of binary quartz particle beds was studied using a kinetic model
developed for monomodal powder beds. The relationships between the parameters of that
kinetic model and the characteristics of the mixtures were good and unique for both the
monomodal and the bimodal powder beds. 

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Densification of Quartz Particle Beds by Tapping (pp. 143-170)