Spiral jet mill with multiple product injector nozzles and method of milling a granular product
AssigneeKronos International, Inc.
InventorsJörg FRIEDRICH, Martin SANDROCK
Life of this patent
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Abstract
A spiral jet mill for grinding granular product, such as TiO2 particles, includes multiple, such as at least two product injector nozzles for mixing and injecting a corresponding number of streams of steam or other pressurized gas and the granular product into the grinding chamber. In use, the ratio of total pressurized gas, such as the sum of all input steam and grinding steam injected into the grinding chamber, to granular product, such as TiO2 pigment particles, is preferably less than the corresponding ratio used in conventional processes so as to realize energy savings relative to the amount of steam or other pressurized gas that is used per unit of granular product that is milled.
Claims16
A spiral jet mill (10) comprising:
- a manifold (16) surrounding and at least partly defining a grinding chamber (18);
- a grind gas injector port (20) extending through the manifold into the grinding chamber for injecting grinding material into the grinding chamber;
- a cover (14) over the manifold, the cover at least partly defining the grinding chamber;
- an exhaust port (36) for exhausting ground product from the grinding chamber;
- and
- a first product injector nozzle (24a) directed into the grinding chamber and configured to mix and inject a first stream of input gas and a granular product into the grinding chamber;
- wherein the steam jet mill further comprises
- a second product injector nozzle (24b) directed into the grinding chamber for mixing and injecting a second stream of input gas and the granular product into the grinding chamber.
Dependencies are inferred from the claim text.