Patent ID: 6057257
Filing Date: 2000-05-02
Classification: C03B,C03C,C04B,C09K,Y02P,Y10S

Abstract:
A process for making an abrasive composition, comprising of the steps of sequentially:(a) mixing from about 50 to about 75 weight percent of electric arc furnace dust, from about 5.5 to about 8.5 weight percent of alumina, and from about 5 to about 40 weight percent of crushed glass to prepare a thermally crystallizable mixture, wherein:1. said electric arc furnace dust has a particle size distribution such that at least about 70 weight percent of its particles are smaller than about 20 microns,2. said electric arc furnace dust comprises from about 35 to about 65 weight percent of at least one iron material selected from iron, iron oxide, and mixtures thereof, and3. at least about 70 weight percent of said crushed glass is comprised of particles which are smaller than 1 centimeter,(b) melting said thermally crystallizable mixture by subjecting it to a temperature of from about 2,300 to about 2,900 degrees Fahrenheit, thereby forming a glass melt,(c) quenching said glass melt by contacting it with water and reducing its temperature from an initial temperature of from about 2,300 to about 2,900 degrees Fahrenheit to a reduced temperature of from about 1,350 to about 1,500 degrees Fahrenheit in less than about 5 seconds, thereby forming a quenched glass, and(d) crushing said quenched glass.