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

摘要

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.PPApparatus for effecting large volume continuous process multi-stage pneumatic separation comprises serially connected pneumatic tower separators including means for controlling air velocity and volume to meet a wide variety of conditions in the solid waste materials being handled.