Slurry blasting process
AssigneeChurch & Dwight Co., Inc.
InventorsBenny S. Yam, Robert C. Jorgensen, William E. Spears, Jr.
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Abstract
An improved slurry blasting process is disclosed wherein a liquid carrier medium such as water contains a dispersed water-soluble particulate abrasive to enhance blast cleaning efficiency and wherein the liquid carrier comprises a saturated solution such as the dissolved particulate abrasive so as to minimize the dissolution of the particulate abrasive therein. Slurry blasting at relatively low pressures below 500 psi and at room temperature provides effective and cost efficient cleaning of substrates. The slurry can be recovered and continuously reused. A recrystallization agent can be added to the slurry to increase abrasive particulate growth in the saturated solution.
Claims31
A process for blast cleaning comprising;
- subjecting a work surface to a blast stream comprising a slurry of a carrier liquid and a particulate abrasive material which is soluble in said carrier liquid, said carrier liquid comprising a saturated solution of said soluble particulate abrasive so as to minimize dissolution of said particulate abrasive therein, said blast stream being directed to said work surface by means of a venturi nozzle wherein said blast stream is accelerated through a restricting orifice and subsequently through an expanding outlet section of said nozzle, said blast stream being formed prior to entering said venturi nozzle and directed through said nozzle by a pressurized air stream, said slurry being directed through said nozzle and at said work surface at a pressure of less than 500 psi.
The process of 8 wherein said adjuvant comprises an anti-corrosion agent.
A process for blast cleaning comprising;
- subjecting a work surface to a blast stream comprising a slurry of a carrier liquid and a particulate abrasive material which is soluble in said carrier liquid, said carrier liquid comprising a saturated solution of said soluble particulate material so as to minimize dissolution of said particulate abrasive therein, subsequent to contact of said blast stream with said work surface, recovering at least a portion of said slurry, treating said recovered slurry to increase the crystal growth of said particulate abrasive material in said slurry and recycling at least a portion of said slurry to said blast stream.
Dependencies are inferred from the claim text.