Method of nonhazardous removal of paint containing heavy metals and coating preparation for performing the same
First Claim
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1. A method of removing paint containing heavy metal comprising:
- introducing an additive which contains a buffer and a phosphate compound and which renders a heavy metal nonhazardous, to a coating preparation;
applying said coating preparation onto a surface coated witha paint containing heavy metal;
removing said coating preparation and said paint containing heavy metal from said surface wherein said removed coating preparation and said removed paint containing heavy metal are nonhazardous as defined by the Toxicity Characteristic Leaching Procedure.
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Abstract
The present invention involves a method of removing paint containing heavy metal from a surface without the production of hazardous wastes. Specifically, this method involves applying a coating preparation to the heavy metal containing paint prior to its removal from its surface. The preparation contains lead reactive chemicals such as phosphates, metal sulfides and organic sulfides. The preparation may also contain buffers such as magnesium oxide and magnesium hydroxide. These chemicals react with the heavy metals rendering them nonhazardous. The invention also involves the coating preparation itself.
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11 Claims
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1. A method of removing paint containing heavy metal comprising:
- introducing an additive which contains a buffer and a phosphate compound and which renders a heavy metal nonhazardous, to a coating preparation;
applying said coating preparation onto a surface coated witha paint containing heavy metal;
removing said coating preparation and said paint containing heavy metal from said surface wherein said removed coating preparation and said removed paint containing heavy metal are nonhazardous as defined by the Toxicity Characteristic Leaching Procedure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- introducing an additive which contains a buffer and a phosphate compound and which renders a heavy metal nonhazardous, to a coating preparation;
Specification