Abrégé

The present disclosure concerns expandable silica particles having a coating comprising talc powder and kaolin powder provided on the outer surface of the expandable silica particle and expandable and expanded silica particles comprising silica fume and/or ultrafine quartz silica sand beneath the surface of the particles. Methods for producing expandable and expanded silica particles are disclosed, including a method using a vibration plate and a furnace having a vibration plate for carrying out that method. The expanded silica particles have high compressive strength, substantially uniform cell size and distribution, low water absorption, and low porosity on the outer surface. They are useful as a filler in matrix materials, like concrete or epoxy, as insulation material with various binder materials, and as water filtration medium.

Classes IPC  ?

• C03C 11/00 - Verre alvéolé
• C03B 19/10 - Fabrication des perles
• F27B 3/06 - Fours à sole, p. ex. fours à réverbérationFours à arc électrique à chambre ou sole mobile, p. ex. inclinable

Abrégé

The present disclosure concerns expandable silica particles having a coating comprising talc powder and kaolin powder provided on the outer surface of the expandable silica particle and expandable and expanded silica particles comprising silica fume and/or ultrafine quartz silica sand beneath the surface of the particles. Methods for producing expandable and expanded silica particles are disclosed, including a method using a vibration plate and a furnace having a vibration plate for carrying out that method. The expanded silica particles have high compressive strength, substantially uniform cell size and distribution, low water absorption, and low porosity on the outer surface. They are useful as a filler in matrix materials, like concrete or epoxy, as insulation material with various binder materials, and as water filtration medium.

Classes IPC  ?

• C03C 11/00 - Verre alvéolé
• C03B 19/10 - Fabrication des perles
• F27B 3/06 - Fours à sole, p. ex. fours à réverbérationFours à arc électrique à chambre ou sole mobile, p. ex. inclinable

Abrégé

The present disclosure concerns expandable silica particles having a coating comprising talc powder and kaolin powder provided on the outer surface of the expandable silica particle and expandable and expanded silica particles comprising silica fume and/or ultrafine quartz silica sand beneath the surface of the particles. Methods for producing expandable and expanded silica particles are disclosed, including a method using a vibration plate and a furnace having a vibration plate for carrying out that method. The expanded silica particles have high compressive strength, substantially uniform cell size and distribution, low water absorption, and low porosity on the outer surface. They are useful as a filler in matrix materials, like concrete or epoxy, as insulation material with various binder materials, and as water filtration medium.

Classes IPC  ?

• C03C 11/00 - Verre alvéolé
• C03B 19/10 - Fabrication des perles
• F27B 3/06 - Fours à sole, p. ex. fours à réverbérationFours à arc électrique à chambre ou sole mobile, p. ex. inclinable

Abrégé

The disclosure concerns a method for producing expanded silica particles. The method comprises providing a furnace (1) comprising a vibration plate (5), the vibration plate (5) being inclined with respect to the horizontal direction. The method further comprises feeding expandable silica particles comprising an expanding agent onto the vibration plate (5) and inducing directional, chaotic motion in the expandable silica particles, by vibrating the vibration plate (5) with a frequency of at least 25 Hz and a maximum acceleration of at least 3 g. The method finally comprises heating the expandable silica particles in the furnace (1) to above the activation temperature of the expanding agent to form expanded silica particles.

Classes IPC  ?

• C01B 33/12 - SiliceSes hydrates, p. ex. acide silicique lépidoïque
• C03B 19/10 - Fabrication des perles
• C03C 1/02 - Ingrédients pré-traités
• C03C 11/00 - Verre alvéolé

Abrégé

The present disclosure concerns an expandable silica particle comprising 50 - 98 wt% of silica powder, 0.85 - 10 wt% of at least one expanding agent and 0.01 - 10 wt% of silica fume. The expandable silica particle further comprises a coating, provided on the outer surface of the expandable silica particle, wherein the coating comprises kaolin powder and talc powder.

Classes IPC  ?

• C01B 33/12 - SiliceSes hydrates, p. ex. acide silicique lépidoïque
• C03B 19/10 - Fabrication des perles
• C03C 1/02 - Ingrédients pré-traités
• C03C 11/00 - Verre alvéolé