US 5,964,911 AGranted

Process for making an abrasive composition

AssigneeHoward J. Greenwald

InventorsJames Morano, Gerald P. Balcar

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Abstract

A process for making an abrasive composition. In the first step of this process, from about 50 to about 85 weight percent electric arc furnace dust is mixed with at least about 10 weight percent of silica to prepare a thermally crystallizable mixture; the 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, and it contains from about 35 to about 65 weight percent of at least an iron material selected from iron, iron oxide, and mixtures thereof. Thereafter the mixture is melted by subjecting it to a temperature of from about 2,300 to about 2,900 degrees Fahrenheit to form a glass melt, the glass melt is quenched by reducing its temperature at least 1,000 degrees Fahrenheit in less than about 5 seconds to form a quenched glass, and the quenched glass is crushed by subjecting it to a pressure of at least 1.0 MegaPascal.

Claims20

Dependent claims

A process for making an abrasive composition, comprising of the steps of sequentially:

(a) mixing from about 50 to about 85 weight percent of electric arc furnace dust and at least about 10 weight percent of silica to prepare a thermally crystallizable mixture, wherein:
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, and
said electric arc furnace dust comprises from about 35 to about 65 weight percent of at least an iron material selected from iron, iron oxide, and mixtures thereof,
(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 reducing its temperature at least 1,000 degrees Fahrenheit in less than about 5 seconds, thereby forming a quenched glass, and
(d) crushing said quenched glass by subjecting it to a pressure of at least 1.0 MegaPascal.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/139,475Filed 25 Aug 1998 · continuation in part
Priority: 28 Jul 1998
Granted: 12 Oct 1999
Term ends: Not estimatedThe source records don’t support an estimate.

Classification31 codes

C09K 3/1409
Anti-slip materials; Abrasives: abrasive particles per se
C03B 19/1045
Forming solid beads: by bringing hot glass in contact with a liquid, e.g. shattering
C03C 1/002
Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels: use of waste materials, e.g. slags
C03C 12/00
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