Method apparatus for separating unwanted matter from granular material

Apparatus to separate unwanted fine matter from granular material fed to said apparatus, said apparatus comprising a housing defining a substantially hollow chamber,

• an inlet to and an outlet from said chamber through said housing, said inlet having an outwardly tapering mouth located interiorly of said housing,
• a funnel member located downstream of and aligned with the mouth of said inlet, said funnel member having a wide entrance opening and a narrow exit opening,
• a deflector plate downstream of and facing the exit opening of the funnel member,
• a plurality of baffles between said deflector plate and said outlet from said chamber,
• and a source of vacuum to produce a material carrying airflow through said inlet, along said chamber, and past said outlet of said apparatus, said housing having a vertical orientation and said outlet from said chamber being located above said inlet to said chamber, and said funnel member and said deflector plate being vertically aligned with one another between said inlet and said outlet of said apparatus, said mouth of said inlet being mounted on a tube which is laterally adjustable of the housing to adjust the positioning of the mouth of said inlet relative to the entrance opening of said funnel member.