# US 5,344,472 A · Method of recycling media for use in pressurized device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,344,472 A - Document ID: US5344472A - Status: Granted - Kind: A - Application number: 08/053,106 - Filed: 1993-04-26 - Granted: 1994-09-06 - Earliest claimed: 1991-09-12 - Inventors: William R. Lynn; Wilfred P. Parent - Web page: https://patentgrep.com/patent/US5344472A ## CPC - C08G 18/0895: {Manufacture of polymers by continuous processes (C08G18/0838 takes precedence)} - B24C 11/00: Selection of abrasive materials {or additives} for abrasive blasts (polishing compositions C09G) - B24D 3/28: Resins {or natural or synthetic macromolecular compounds (B24D3/22 takes precedence)} - B24D 3/32: for porous or cellular structure - B24D 3/346: {utilised during polishing, or grinding operation} - C08G 18/4833: {Polyethers containing oxyethylene units} - C08G 2110/0083: prepared using water as the sole blowing agent - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - B24C: ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL - B24D: TOOLS FOR GRINDING, BUFFING OR SHARPENING (abrading-bodies specially designed for tumbling apparatus, e.g. abrading-balls B24B31/14; honing tools B24B33/08; lapping tools B24B37/11) ## Abstract A method of recycling a reusable composite blasting media comprising a plurality of discrete particles of an abrasive component combined with a carrier component. The method comprises the steps of collecting the recyclable composite blasting media after at least one blasting cycle, mixing at least one of additional abrasive component and additional carrier component with the collected composite blasting media, and forming the composite media into a plurality of granules each containing a plurality of discrete particles of the abrasive component and the carrier component. ## Claims ### Claim 1 A method of recycling a used composite blasting media after being propelled through desired blasting equipment, said composite blasting media comprising a plurality of granules which each contain a plurality of discrete particles of an abrasive component physically interconnected with one another by a carrier component, which is a solid at room temperature, said method comprising the steps of: collecting the composite blasting media after at least one blasting cycle; mixing at least one of additional abrasive component and additional carrier component, which is a solid at room temperature, with the collected composite blasting media; and forming the mixture of composite blasting media into a plurality of granules each containing a plurality of discrete particles of the abrasive component physically interconnected with one another by the carrier component. ### Claim 2 (depends on 1) A method of recycling the composite blasting media of claim 1, further comprising the step of washing, in a washing device, the collected composite blasting media with a cleaning solution prior to the mixing step. ### Claim 3 (depends on 2) A method of recycling the composite blasting media of claim 2, further comprising the step of removing moisture from the washed composite blasting media, with a moisture removing mechanisms, prior to the mixing step. ### Claim 4 (depends on 1) A method of recycling the composite blasting media of claim 1, further comprising the step of cleaning the collected composite blasting media, with a cleaning device, prior to the mixing step. ### Claim 5 (depends on 1) A method of recycling the composite blasting media of claim 1, further comprising the step of screening the collected composite blasting media prior to the mixing step. ### Claim 6 (depends on 1) A method of recycling the composite blasting media of claim 1, further comprising the step of using the composite blasting media a plurality of times prior to recycling the composite blasting media. ### Claim 7 (depends on 1) A method of recycling the composite blasting media of claim 1, wherein said mixing step comprises the step of mixing both additional abrasive component and additional carrier component with the collected composite blasting media. ### Claim 8 (depends on 1) A method of recycling the composite blasting media of claim 1, further comprising, after the collecting step but prior to the mixing step, the steps of: causing the collected composite blasting media to swell by allowing the collected composite blasting media to absorb liquid; and screening the swelled composite blasting media with a screening device so as to allow fines and other debris and contaminates to pass through the screening device while retaining the swollen composite blasting media. ### Claim 9 (depends on 8) A method of recycling the composite blasting media of claim 8, further comprising the step of removing the absorbed liquid from the composite blasting media with a liquid absorbing mechanism. ### Claim 10 (depends on 1) A method of recycling the composite blasting media of claim 1, wherein said forming step comprises the steps of: heating the mixture of the composite blasting media to melt the carrier component, which is a solid at room temperature; allowing the heated composite blasting media to cool to a solidifying temperature of the carrier component and thereby solidify the composite blasting media; and grinding the composite blasting media into a plurality of granules each containing a plurality of discrete particles of the abrasive component physically interconnected with one another by the carrier component. ### Claim 11 (depends on 10) A method of recycling the composite blasting media of claim 10, further comprising, prior to allowing the heated composite blasting media to solidify, the step of thoroughly mixing the heated composite blasting media to form a uniform mixture thereof. ### Claim 12 (depends on 1) A method of recycling the composite blasting media of claim 1, wherein said forming step comprises the steps of: allowing the mixture of the composite blasting media with at least one of additional abrasive component and additional carrier component to chemically react with one another; allowing the chemically reacted composite blasting media to solidify; and grinding the composite blasting media into a plurality granules each containing a plurality of discrete particles of the abrasive component physically interconnected with one another by the carrier component. ### Claim 13 (depends on 12) A method of recycling the composite blasting media of claim 12, further comprising, prior to allowing the chemically reacted composite blasting media to solidify, the step of thoroughly mixing the mixture of the composite blasting media to form a uniform mixture thereof. ### Claim 14 (depends on 1) A method of recycling the composite blasting media of claim 1, wherein said forming step comprises the steps of: impregnating additional abrasive component into the carrier component; and grinding the composite blasting media into a plurality granules each containing a plurality of discrete particles of an abrasive component physically interconnected with one another by the carrier component. ### Claim 15 A method of forming a recyclable granulated composite blasting media for use in treating a surface to remove undesired contaminants therefrom, said composite blasting media being suitable for being propelled via a fluid stream through desired blasting equipment; said method comprising the steps of: forming granules of the composite blasting media, each said granule comprising a plurality of discrete particles of an abrasive component physically interconnected with one another by a carrier component, which is solid at room temperature, the carrier component being selected to wear, during use of the composite blasting media, at a rate so as to continuously expose additional underlying abrasive particles on an exterior surface of that composite media particle, but not at a rate to allow the premature separation of the abrasive particles from an exterior surface of that composite media particle; propelling the recyclable composite blasting media through desired blasting equipment to treated a desired surface; collecting the composite blasting media with a collecting device and cleaning the collected composite blasting media, after at least one blasting cycle, with a cleaning device; and reforming the composite blasting media into a plurality of granules each containing a plurality of discrete particles of an abrasive component physically interconnected with one another by a carrier component. ### Claim 16 (depends on 1) A method of recycling the composite blasting media of claim 1, further comprising the steps of separating recyclable composite blasting media, with a separating device, from fines, debris and contaminates after the collecting step and prior to the mixing step. ### Claim 17 A method of recycling a used composite blasting media after being propelled through desired blasting equipment, said composite blasting media comprising a plurality of granules which each contain a plurality of discrete particles of an abrasive component physically interconnected with one another by a carrier component, which is solid at a temperature below room temperature, said method comprising, a temperature below room temperature, the steps of: collecting the composite blasting media after at least one blasting cycle; mixing at least one of additional abrasive component and additional carrier component with the collected composite blasting media; and forming the mixture of composite blasting media into a plurality of granules each containing a plurality of discrete particles of the abrasive component physically interconnected with one another by the carrier component.