Patent ID: 11952303
Assignee: HERAEUS QUARZGLAS GMBH & CO. KG
Field: Measurement (Instruments)
Classification: CPC C  B  G  H  Y | IPC B  C  G  H

Claim 10:
11. The process according to claim 10, wherein the spray drying takes place through the spraying of the slurry through a nozzle into a spray tower and comprises at least one of the following:
spray granulation in the spray tower;
the presence of a pressure of the slurry at the nozzle of not more than 40 bar, in a range from 1.3 to 20 bar, wherein the pressure is given in absolute terms (relative to p=0 hPa);
a temperature of the droplets upon entering into the spray tower in a range from 10 to 50° C.;
a temperature at the side of the nozzle directed towards the spray tower in a range from 100 to 450° C.;
a throughput of slurry through the nozzle in a range from 0.05 to 1 m3/h;
a solids content of the slurry of at least 40 wt.-%, in a range from 50 to 80 wt.-%;
based on the total weight of the slurry;
a gas inflow into the spray tower in a range from 10 to 100 kg/min;
a temperature of the gas flow upon entering into the spray tower in a range from 100 to 450° C.;
a temperature of the gas flow at the exit out of the spray tower of less than 170° C.;
the gas is selected from the group consisting of air, nitrogen and helium, or a combination of two or more thereof;
a residual moisture content of the granulate on removal out of the spray tower of less than 5 wt.-%, in each case based on the total weight of the silicon dioxide granulate created in the spray drying;
at least 50 wt.-% of the spray granulate, based on the total weight of the silicon dioxide granulate created in the spray drying, completes a flight time in a range from 1 to 100 s;
at least 50 wt.-% of the spray granulate, based on the total weight of the silicon dioxide granulate created in the spray drying, covers a flight path of more than 20 m;
the spray tower has a cylindrical geometry;
a height of the spray tower of more than 10 m;
screening out of particles with a size of less than 90 μm before the removal of the granulate from the spray tower;
sieving out of particles with a size of more than 500 μm after the removal of the granulate from the spray tower; and
the exit of the droplets of the slurry out of the nozzle occurs at an angle of 30 to 60 degrees from vertical.