Devices for manufacturing hollow spherical glass particles
AssigneeOmya International AG
InventorsGerhard OLBERT, Laila Raquel PASIN E MATOS, Ekaterina HELWIG
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Abstract
Process for the preparation of hollow spherical glass particles comprising at least SiO2, Al2O3, and an alkali metal oxide, wherein the process comprises the preparation of precursor particles comprising at least SiO2, Al2O3, and an alkali metal oxide by mixing the starting materials, slurrying the starting materials with water followed by spry-drying and heat-treating the obtained precursor-particles at a temperature from 1000° C. to 1800° C., preferably from 1300° C. to 1600° C. by contacting the precursor particles with at least one naked flame.
Claims12
-52. (canceled)
A heating device for heat-treating precursor-particles comprising SiO2, Al2O3, and an alkali metal oxide at a temperature from 1000 to 1800° C. thereby obtaining hollow spherical glass particles, comprising at least
- a longitudinal reaction chamber comprising at least two different zones (a) and (b), wherein
- (a) is a combustion zone capable of being heated by least one naked flame, wherein at least one burner nozzle which is connected with an inlet for the flammable gas is arranged in the combustion zone,
- (b) is a cooling zone, and
- an inlet for the flammable gas,
- an inlet for introducing a non-flammable gas into the combustion zone (a),
- means for adding precursor-particles comprising SiO2, Al2O3, and an alkali metal oxide to the flammable gas and/or the non-flammable gas, wherein the precursor-particles are dispersed in the flammable gas which feeds the flame(s) in the heating device and/or the precursor-particles are dispersed in a non-flammable gas which is added into the heating device at a position upstream of the flame(s),
- an outlet for removing hollow spherical glass particles, non-flammable gas and waste from the cooling zone (b).
A heating device for heat-treating precursor-particles comprising SiO2, Al2O3, and an alkali metal oxide at a temperature from 1000 to 1800° C. thereby obtaining hollow spherical glass particles, comprising at least
- an inlet for a flammable gas,
- optionally an inlet for a non-flammable gas,
- a cylindrical, rotatable reaction chamber which is rotatably mounted at its ends in a fixed front unit and a fixed rear unit, wherein the rotatable, cylindrical reaction chamber is arranged horizontal or inclined towards its rear end, and wherein the rotatable, cylindrical reaction chamber comprises at least two different zones (a) and (b), wherein
- (a) is a combustion zone capable of being heated by least one naked flame, wherein at least one burner nozzle which is connected with the inlet for the flammable gas is arranged in the combustion zone, and
- (b) is a cooling zone,
- a fixed front unit comprising at least a mounting for the cylindrical, rotatable reaction chamber, an inlet for a stream of a flammable gas which is connected with the burner nozzle arrange in zone (a), and optionally an inlet for a non-flammable gas,
- a fixed rear unit comprising at least a mounting for the cylindrical, rotatable reaction chamber, an outlet for hollow spherical glass particles and an outlet for waste gas, and
- a drive for rotating the cylindrical, rotatable reaction chamber around its longitudinal axis.
Dependencies are inferred from the claim text.