Solid material comminution or disintegration – Processes – Miscellaneous
Patent
1976-03-18
1977-05-31
Custer, Jr., Granville Y.
Solid material comminution or disintegration
Processes
Miscellaneous
241 33, B02C 2500
Patent
active
040264793
ABSTRACT:
A method and a system are disclosed for maintaining optimum throughput in a grinding circuit of the type in which fresh ore is fed to a rod mill and the ground ore from the rod mill, together with the ground ore from a ball mill operated in a reversed circuit, are combined in a pump box and pumped to a cluster of hydrocyclone classifiers. The rod mill is operated in open circuit but the ball mill is operated in closed circuit with the cyclone classifiers which serve to classify the mill discharge material, returning the oversize to the ball mill. The system comprises monitoring devices for sensing the cyclone classifier feed density and any one or combinations of the following conditions of the grinding circuit: (1) rod mill sound, (2) ball mill sound, (3) pump box level, and (4) cyclone overflow particle size and density. A constraint check and decision memory block is connected to the cyclone classifier feed density monitor and to at least one of the following overload constraints from the above corresponding monitors: (1) rod mill overload sound, (2) ball mill overload sound, (3) pump box high level, and (4) cyclone overflow high particle size and high/low density. A cascade control means is connected to the output of the cyclone classifier feed density monitor and has a control input activated by the constraint check and decision memory block. A matrix memory block is connected to a fresh ore feed rate monitor and to the rod mill sound monitor and has a control input activated by the constraint check and decision memory block, such matrix memory block being adapted to develop rod mill feed rate setpoints, as a discontinuous function of both the current rod mill feed rate and the rod mill sound. Finally, a fresh ore feed controller is connected to the output of the cascade control means and the matrix memory block, and operated by either the cascade control means or the matrix memory block depending on which one of the control inputs of the cascade control means and the matrix memory block has been activated by the constraint check and decision memory block.
REFERENCES:
patent: 3314614 (1967-04-01), Daniel et al.
patent: 3596839 (1971-08-01), Putman
patent: 3779469 (1973-12-01), Putman
patent: 3784115 (1974-01-01), Krijger et al.
patent: 3942727 (1976-03-01), Fahlstrom et al.
Bradburn Ronald G.
Dutton Walter A.
Flintoff Brian C.
Walker Robert A.
Brenda Mines Ltd.
Custer, Jr. Granville Y.
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