Process for treating construction and demolition waste material with kinetic pulverization

A process for treating construction and/or demolition (C&D) source material, the process comprising:

• subjecting the C&D source material to pre-sorting to form a feedstock that has particle size below 4 inches and includes a frangible material and a ductile material;
• providing a kinetic pulverizer comprising a pulverizing rotor assembly disposed within an interior chamber, wherein the pulverizing rotor assembly is configured to rotate to form vortices that subject the feedstock to self-collisions within the interior chamber;
• subjecting the feedstock to a kinetic pulverization stage wherein the feedstock is fed into the kinetic pulverizer to produce a pulverized material comprising a size-reduced fraction derived from the frangible material and an oversized fraction derived from the ductile material, the pulverizing rotor assembly being operated at a rotation speed of 500 RPM to 1,200 RPM;
• withdrawing the pulverized material from the kinetic pulverizer;
• and
• subjecting the pulverized material to a screening to produce a size-reduced stream and an oversized stream;
• wherein the feedstock comprises gypsum and wherein the kinetic pulverizer is operated such that individual particles of the size-reduced fraction are less than 2 mm in diameter.