Composition and process for manufacturing lightweight...

C - Chemistry – Metallurgy – 04 – B

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C04B 38/00 (2006.01) B29B 9/02 (2006.01) C04B 18/02 (2006.01)

Patent

CA 2171733

A method is provided for preduc- ing dense, free-flowing and non-calcing al- kali metal silicate-based particles which are heat expandable into lightweight par- ticles of a spumiform character. Pursuant to the invention, one provides at a se- lected temperature a dilatant aqueous gel comprising an alkali metal silicate as the majority non-aqueous component, the \ cate being present in the gel in a dissolved state; and the non-aqueous content of the gel being in the range of from about 38 to 65 % (w/w). Shearing forces are imposed upon the gel which exceed the flow re- sponse characteristics of the gel, whereby the viscosity of the gel becomes suffi- ciently high to cause a discontinuity in the gel, resulting in disruption into discrete particles. The discrete particles are con- ditioned while being maintained as sepa- rate entities to thereby form a skin on the particles so that they will not agglomerate or coalesce with one another. The condi- tioned particles are dried to form particles having about a 5 to 40 % (w/w) moisture level.

L'invention concerne un procédé de production de particules coulantes et non agglutinantes à base de silicate de métal alcalin que l'on peut transformer en particules légères spumeuses par dilatation thermique. Le procédé selon l'invention consiste à produire à une température sélectionnée un gel aqueux rhéoépaisissant comprenant, en tant que composant principal aqueux, un silicate de métal alcalin présent sous forme dissoute, et la partie non aqueuse du gel représentant d'environ 38 à 65 % (poids/poids); à appliquer des forces de cisaillement supérieures aux caractéristiques de réponse d'écoulement du gel de sorte que la viscosité de ce dernier soit suffisamment élevée pour créér une discontinuité dans celui-ci, provoquer sa rupture et la formation de particules séparées. Lesdites particules séparées sont ensuite traitées en tant qu'entités séparées de sorte qu'une peau empêchant leur agglomération ou leur coalescence se forme sur ces dernières. Les particules ainsi traitées sont ensuite séchées afin de former des particules présentant un taux d'humidité d'environ 5 à 40 % (poids/poids).

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