Unimin Corporation

Covia Holdings Corporation

Louis M Schlesinger

Robert Ratcliff

Ibezim Anazia

David D Kragten

Christy Karr

Gerardo Hernandez Gonzalez

Artemio Gonzalez Acevedo

Scott Van Remortel

Scott VanRemortel

Mauricio Duran Sanchez

Mauricio Durán Sánchez

An ultra-fine powder formed from a naturally occurring mineral or rock material and having a controlled or 'engineered' particle size distribution (PSD) to match the infrared spectra with a maximum particle size in the range of 14-17 microns measured as either D99, or preferably D95, and a minimum particle size D5 in the range of 4-7 microns. Preferably the maximum particle size is about 15 microns, the minimum particle size is about 5 microns and the D50 particle size is about 8-10 microns with the moisture content of the particle size 'engineered' powder being less than about 0.20 percent by weight and preferably about 0.05 to 0.08 percent by weight of the powder. This specially &#x201c;engineered&#x201d; ultra-fine powder is used to reduce the thermicity of thermal film to a value less than about 20%.

Powder formed from mineral or rock material with controlled particle size distribution for thermal films

An ultra-fine nepheline syenite powder produced from a pre-processed nepheline syenite powder feedstock. The powder having a 'controlled' maximum grain size D95 or D99 of less than about 20 microns and a 'controlled' minimum grain size D5 in the range of 2-8 microns with a particle size spread D5-D95 of less than about 12 microns.

Nepheline syenite powder with controlled particle size and novel method of making same

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.

Method of processing nepheline syenite powder to produce an ultra-fine grain size product

Growing community of inventors

Spruce Pine, NC, United States of America

Louis M Schlesinger