Olivine Foundry Sand from North Carolina Dunite by Differential Grinding.
Lamont-WE; Sullivan-GV; Davis-EG; Sanders-SD
Fall Mtg & Exh Soc Min Eng AIME October 19-21, 1977, St. Louis Missouri. SME Preprint 77-H-369 :22 pages
As part of its program to minimize mineral and metal needs, the federal Bureau of Mines conducted investigations to determine the feasibility of producing foundry-sand-grade olivine concentrates from low-grade sources. Using a Bureau-patented attrition-grinding technique, concentrates meeting Steel Founder's Society of America (SFSA) specifications for loss on ignition (loi) were prepared. Studied showed that green strengths and tensile strengths of the attrition-ground olivine were equivalent or superior to those of commercial materials. Metal-casting studies showed that molds of attrition-ground olivine produced better surface finishes. The improved surface finishes were attributed in part to increased grain sphericity.
Fall Mtg. & Exh., Soc. Min. Eng., AIME, St. Louis, Missouri, 10/19-21/77, SME Preprint 77-H-369