First Bauxite LLC

Harbison-walker Reeractories Company

Howard Winkelbauer

H David Prior

Viktor Fischer

Carl Sorrell

Bryan Geary

Craig Searchfield

A proppant having a high alumina content, low iron content and low alkali content may be prepared from a raw bauxite ore containing greater than 60 wt. % tri-hydrate alumina. The proppant may further be prepared from calcined bauxite having greater than 80 wt. % tri-hydrate alumina.

Ultra high strength proppant and method of preparing the same

A refractory composition comprising at least 50 weight percent chromic oxide (CrO), as measured by chemical analysis. The composition includes fused chromia-containing grain, powdered chromic oxide and sintered chromia-containing grain. The fused chromia-containing grain and the sintered chromia-containing grain comprise at least 50 weight percent chromia oxide, as measured by chemical analysis.

Chromia-alumina refractory

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Munhall, PA, United States of America

Howard Winkelbauer