Air-stream mill

Details Air-stream mill Air-stream mill

1975-10-24

1977-07-12

Custer, Jr., Granville Y.

Solid material comminution or disintegration

Apparatus

Including means applying fluid to material

241 80, B02C 1906

Patent

active

040349195

ABSTRACT:
An air-stream mill for milling free-flowing, large-lump, solid materials into a particulate condition. The mill has two grinding chambers provided with opposed injectors that impel flows of large-lump, solid materials being delivered into the grinding chambers upstream of the injectors as two opposed, counter flowing streams of a gas-solid mixture of the large-lump materials. The lumps of solid materials in the counter-flowing streams collide internally of the grinding chambers and are converted to free particles of a smaller size. The particles from the grinding chambers leave the grinding chamber as two separate and independent flows which are received upstream of opposed injectors for a milling chamber. The latter injectors deliver the free particles as two opposed, counter-flowing streams of a gas-solid mixture. The solid particles in these streams collide internally of the milling chamber and the particles are converted to a smaller size. The converted particles are delivered as a stream in suspension in a gas-solid mixture to a two-stage separator that has a first stage in which the particles received are separated into coarser and finer particles. The coarser particles are returned upstream of the injectors for the grinding chambers for recycling through the grinding chambers, the milling chamber and the separator. A second stage of the separator receives the finer particles where further separation takes place between finer and finest particles. The finest particles are discharged as finished material in its desired particulate condition. The remaining finer particles are returned upstream of either the injectors for both the grinding chambers or only upstream of those of the milling chamber for recycling thereof.

REFERENCES:
patent: 2624516 (1953-01-01), Andries
patent: 2672296 (1954-03-01), Venable
patent: 3837583 (1974-09-01), Kugelberg et al.
patent: 3877647 (1975-04-01), Gorobets et al.

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