Feldspar is a crystalline mineral of tectosilicate compounds.  It is primarily found as an igneous rock, and it is the primary component in most granites.   Feldspar is the most abundant mineral on the earth’s crust.  Mechanically weathered feldspar can be found many sedimentary rocks and chemically weathered feldspar is responsible for many clays including kaolin. 

Feldspar is highly abrasive with a Mohs hardness value of 6 – 65.  It is also very chemical resistant and durable. 

The main uses for feldspar are in the glass and ceramic industries, as well as construction industries. 

However, ground feldspar is also used as fillers in the paint, adhesives and plastic industries.  Feldspar powder provides strength, durability and resistance to wear.  It also provides chemical inertness.  Ground feldspar can be added to achieve high solids content with low viscosity impact. 

For high quality feldspar powder production, Hosokawa provides the Hosokawa Alpine Super-Orion Ball Mill  in circuit with a Hosokawa Alpine Air Classifier.  For feldspar applications, the ball mill will typically be constructed with Aluminum Oxide media and ball mill lining.  The most common Hosokawa air classifier used for feldspar is the Hosokawa Alpine Stratoplex (ASP)  which is used for a cut point (top size) of 20 to 200 microns.  For super-fine applications, the Hosokawa Alpine Turboplex (ATP)  air classifier is used, with a cut point (top size) of 5 to 50 microns, with single and multi-wheel options.  Both classifiers are made with Aluminum Oxide Classifier Wheels, and with interior Aluminum Oxide tiling for both fine grinding and durability.  Hosokawa has the experience and expertise to set up quality systems for these challenging applications.