Multi-stage pneumatic municipal solid waste separation and recovery of a plurality of classifications

• Main Authors: MACKENZIE; HAROLD B, ANDERSON; INGVAR G
• Format: Patent
• Language: English
• Published: 30.08.1977
• Subjects: BLASTING; COMBUSTION APPARATUS; COMBUSTION PROCESSES; CONSUMING WASTE PRODUCTS BY COMBUSTION; CREMATION FURNACES; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; LIGHTING; MECHANICAL ENGINEERING; OTHER SEPARATING BY DRY METHODS APPLICABLE TO BULK MATERIAL,e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL; PERFORMING OPERATIONS; SEPARATING SOLIDS FROM SOLIDS; SEPERATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, ORSIFTING OR BY USING GAS CURRENTS; SORTING; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS; TRANSPORTING; WEAPONS

Heterogeneous municipal solid waste is pneumatically separated in a first stage into relatively heavy incombustible and lighter weight combustible fractions. The first stage light combustible fraction is further pneumatically separated in a second stage into heavier grade fuel and lighter grade fuel fractions. In a third stage still further separation may be effected of the second stage lighter grade fraction into a heavier fraction suitable for other uses such as in the manufacture of certain building materials and a lightest fraction most suitable for air suspension boiler or kiln firing. Primary shredding of all of the solid waste to be pneumatically separated, and final reshredding of the fuel grade materials are provided for to attain maximum combustion efficiency.