Loading patent…
AssigneeUnimin Corporation
InventorsLouis M. Schlesinger, Mauricio Duran Sanchez, Gerardo Hernandez Gonzalez, Artemio Gonzalez Acevedo
Estimating the term…
The method of converting nepheline syenite particulate feedstock with a grain size profile to an ultra-fine grain finish product for subsequent commercial use, the ultra-fine grain final product has a maximum grain size of less than about 6 microns. The method comprising: providing a dry feedstock with a controlled maximum particle size greater than about 20 microns; grinding the feedstock in a dry state by passing the feedstock vertically downward through a continuous, high-speed stirred ball mill whereby the feedstock is ground into an intermediate powder having a drastically reduced grain size profile than the grain size profile of the feedstock; and passing the intermediate powder from the mill through an air classifier using a rapidly moving high speed air stream moving along a given path to convey the ultra-fine grain product along the path and from the classifier and to allow coarse particulate material including particles larger than the ultra-fine product to be separated and then expelled from the classifier.
A method of converting a pre-processed substantially dry nepheline syenite feedstock with a particle size profile and a maximum particle size greater than 20 microns into an ultra-fine grain finished product in the form of a nepheline syenite powder with a maximum particle size of less than 10 microns, said feedstock having a first hardness, said method comprising:
A method of converting a pre-processed substantially dry nepheline syenite feedstock with a particle size profile and a maximum particle size greater than 20 microns into an ultra-fine grain finished product in the form of a nepheline syenite powder with a maximum particle size of less than 10 microns, said feedstock having a first hardness, said method comprising:
The method of converting a pre-processed nepheline syenite particulate feedstock with a particle size profile having a maximum particle size greater than 20 microns to an ultra-fine grain finish product for subsequent commercial use, said ultra-fine grain product having a maximum grain size of less than 10 microns, said method comprising:
The method of converting a pre-processed particulate feedstock of an igneous rock into an ultra-fine grain finish product for subsequent commercial use, said ultra-fine grain product having a maximum particle size of less than 10 microns, where said pre-processed feedstock has a particle size profile with a maximum particle size greater than 20 microns, said method comprising:
Dependencies are inferred from the claim text.