Impact-attrition mill utilizing air flow

Claim 2

The improvement in a mill for the crushing, milling and classification of dry ore and other friable materials comprising the combination with a housing and a drive motor of the following: an ore intake chute; a fine particle outlet means; a primary reduction chamber within said housing; an impact rotor connected to the said motor nonconcentrically mounted within said primary reduction chamber such that upon rotation of said rotor an air flow is produced directionally from said intake chute through said primary reduction chamber to said fine particle outlet means; a plurality of impact bars mounted upon said rotor, extending outward from the periphery of said rotor; a secondary reduction chamber intermediate said primary reduction chamber and said fine particle outlet, and separated from the primary reduction chamber and the ore intake chute by a deflector wall terminating in a movable flap structure; attrition means within said secondary reduction chamber, obstructing a straight line passage of particles from said primary reduction chamber to said outlet means; a plurality of elongated angular members depending inwardly from the walls of the primary reduction chamber, said members being so positioned as to provide impingement surfaces for particles driven by the said impact rotor, the longitudinal axes of said members being parallel with the axis of the said impact rotor.

Claim 3

The improvement in a mill for the crushing, milling and classification of dry ore and other friable materials comprising the combination with a housing and a drive motor of the following: an ore intake chute; a fine particle outlet means; a primary reduction chamber within said housing; an impact rotor connected to the said motor nonconcentrically mounted within said primary reduction chamber such that upon rotation of said rotor an air flow is produced directionally from said intake chute through said primary reduction chamber to said fine particle outlet means; a plurality of impact bars mounted upon said rotor, extending outward from the periphery of said rotor; a secondary reduction chamber intermediate said primary reduction chamber and said fine particle outlet, and separated from the primary reduction chamber and the ore intake chute by a deflector wall terminating in a movable flap structure; attrition means within said secondary reduction chamber, obstructing a straight line passage of particles from said primary reduction chamber to said outlet means; a plurality of elongated angular members depending inwardly from the walls of the primary reduction chamber, said members being so positioned as to provide impingement surfaces for particles driven by the said impact rotor, the longitudinal axes of said members being parallel with the axis of the said impact rotor.

Claim 4

The improvement in a mill for the crushing, milling and classification of dry ore and other friable materials comprising the combination with a housing and a drive motor of the following: an ore intake chute; a fine particle outlet means; a primary reduction chamber within said housing; an impact rotor connected to the said motor nonconcentrically mounted within said primary reduction chamber such that upon rotation of said rotor an air flow is produced directionally from said intake chute through said primary reduction chamber to said fine particle outlet means; a plurality of impact bars mounted upon said rotor, extending outward from the periphery of said rotor; a secondary reduction chamber intermediate said primary reduction chamber and said fine particle outlet, and separated from the primary reduction chamber and the ore intake chute by a deflector wall terminating in a movable flap structure; attrition means within said secondary reduction chamber, obstructing a straight line passage of particles from said primary reduction chamber to said outlet means; a plurality of elongated angular members depending inwardly from the walls of the primary reduction chamber, said members being so positioned as to provide impingement surfaces for particles driven by the said impact rotor, the longitudinal axes of said members being parallel with the axis of the said impact rotor.

Claim 5

The impact attrition mill of claim 1 wherein: the flap structure is an air control vane adjustable to vary the amounts of air which flow into the secondary reduction chamber and back into the primary Reduction chamber.

Claim 6

The apparatus of claim 1 wherein the said rotor is provided with a plurality of discs extending radially outwardly and perpendicular from the axis of said impact rotor; and wherein said impact bars are mounted within slots in said discs.

Claim 7

The apparatus of claim 3 wherein each of said impact bars comprises a flat bar mounted in said slots; A perpendicular webbing depending outwardly from each of said bars and affixed thereto; And a rolled impact member affixed upon each of said webbins extending the length webbings

Claim 8

The apparatus of claim 4 wherein the secondary reduction chamber has mounted therein a classification screen.

Claim 9

An impact attrition mill comprising: a housing; a frame mounted upon said housing; a shaft mounted upon said frame; a plurality of spaced apart discs mounted upon said shaft perpendicular thereto; a plurality of impact member holding means located upon the periphery of each of said discs; impact member means fastened to each of said impact member holding means; the shaft, discs, impact member holding means and impact member means constituting a rotor; an arcuate first chamber mounted within said housing and about said rotor at a distance therefrom and nonconcentric thereto; impact means mounted upon a portion of the interior of said arcuate first chamber; chute means communicating through said housing to the space between said arcuate first chamber and said rotor; a second chamber mounted upon the interior of said housing and intercommunicating with said first chamber; dividing means separating the second chamber from the first chamber and the chute means, terminating in an air flow regulating flap means; grid means located within said second chamber; screen means fastened adjacent the outlet of said second chamber, which outlet does not intercommunicate with the said first chamber; adjustment means for said screen means suitable to adjust the angular relationship of said screen to said second chamber; and outlet means intercommunicating between the exterior of said housing and the said screen means.

Claim 10

An impact attrition mill comprising: a housing; a frame mounted upon said housing; a shaft mounted upon said frame; a plurality of spaced apart discs mounted upon said shaft perpendicular thereto; a plurality of impact member holding means located upon the periphery of each of said discs; impact member means fastened to each of said impact member holding means; the shaft, discs, impact member holding means and impact member means constituting a rotor; an arcuate first chamber mounted within said housing and about said rotor at a distance therefrom and nonconcentric thereto; impact means mounted upon a portion of the interior of said arcuate first chamber; chute means communicating through said housing to the space between said arcuate first chamber and said rotor; a second chamber mounted upon the interior of said housing and intercommunicating with said first chamber; dividing means separating the second chamber from the first chamber and the chute means, terminating in an air flow regulating flap means; grid means located within said second chamber; screen means fastened adjacent the outlet of said second chamber, which outlet does not intercommunicate with the said first chamber; adjustment means for said screen means suitable to adjust the angular relationship of said screen to said second chamber; and outlet means intercommunicating between the exterior of said housing and the said screen means.

Claim 11

An impact attrition mill, comprising: a closed horizontally disposed cylindrically-shaped primary reduction chamber having a motor driven impact rotor nonconcentrically mounted to provide an enlarged ore intake space at one side and adjacent the top of the chamber, the rotor having radially extending vanes and rotating toward and down through the ore intake space; a gravity feed intake chute disposed above the primary reduction chamber and communicating therewith to supply ore directly onto the top of the rotor and to the ore intake space; a plurality of shatter bars disposed within the primary reduction chamber opposite the rotor adjacent the ore receiving space and positioned so that ore will be flung by the rotor against the shatter bars; a secondary reduction chamber disposed adjacent the primary reduction chamber on the side opposite the ore receiving space and communicating with the primary reduction chamber to receive the flow of broken ore from the shatter bars and having impact attrition means obstructing a straight line passage of broken ore through the secondary reduction chamber to an outlet means; a passage between the secondary reduction chamber and the intake chute for providing diversion of a portion of the broken ore stream to the ore intake space and including adjustable deflector means for varying the amount of ore diverted from the secondary reduction chamber.

Claim 12

An impact attrition mill, comprising: a closed horizontally disposed cylindrically-shaped primary reduction chamber having a motor driven impact rotor nonconcentrically mounted to provide an enlarged ore intake space at one side and adjacent the top of the chamber, the rotor having radially extending vanes and rotating toward and down through the ore intake space; a gravity feed intake chute disposed above the primary reduction chamber and communicating therewith to supply ore directly onto the top of the rotor and to the ore intake space; a plurality of shatter bars disposed within the primary reduction chamber opposite the rotor adjacent the ore receiving space and positioned so that ore will be flung by the rotor against the shatter bars; a secondary reduction chamber disposed adjacent the primary reduction chamber on the side opposite the ore receiving space and communicating with the primary reduction chamber to receive the flow of broken ore from the shatter bars and having impact attrition means obstructing a straight line passage of broken ore through the secondary reduction chamber to an outlet means; a passage between the secondary reduction chamber and the intake chute for providing diversion of a portion of the broken ore stream to the ore intake space and including adjustable deflector means for varying the amount of ore diverted from the secondary reduction chamber.