Patent ID: 6871604

Claim:
Method of converting solid combustible waste materials into fuel, which comprises subjecting the waste materials to size reducing steps of which the last step comprises a milling operation which pulverizes the waste materials into fine particles having a high surface to mass ratio and forming a fuel, and pneumatically feeding said fine particles into a combustion reactor operating at high temperature adapted to rapidly gasify said particles, and in which primarily food waste is subjected in a size-reducing step to pulping, followed by water removal to produce a pulped product having a particle size suitable for milling into fine particles, and mixed waste is subjected in a separate size-reducing step to shredding, followed by metal extraction of any fugitive metallic materials, to produce a shredded, metal-free product of a size suitable for milling into fine particles, said pulped product and said shredded metal-free product are then intermixed and their mixture is subjected to the milling operation to produce essentially dry fine particles having a high surface to mass ratio and forming a fuel, which particles are then directly fed into the combustion reactor.