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US 4,242,220 AGranted
Waste disposal method using microwaves
OwnerGentaku Satoinventor
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Abstract
Waste such as sludge containing poisonous substances is processed into a safe article by removing water in a usual manner, drying the waste to substantial dryness by microwave heating, mixing the dry waste powder with a thermoplastic resin, irradiating the mixture with microwaves to encapsulate the waste particles with the resin and to heat polymerize the resin, and molding the resin encapsulated particles into an article.
Claims8
A method of manufacturing a safe article from a water-containing waste having poisonous substances, comprising the steps of:
- (a) removing a major portion of water contained in the waste,
- (b) stirring the waste during the subsequent steps except for the last step,
- (c) drying the waste to a residual water content of about 12-13% by weight, without igniting flammable material contained in the waste,
- (d) microwave heating the waste to further reduce the residual water content to 0.1-5% by weight so that the waste becomes powdery,
- (e) cooling the waste powder to room temperature,
- (f) contacting the waste powder with a thermoplastic resin,
- (g) microwave heating the mixture of the waste powder and the thermoplastic resin at a rate which enables the resin to melt and encapsulate the waste powder particles, and
- (h) molding the resin encapsulated particles into an article having a desired shape.
5 more elements
Dependencies are inferred from the claim text.