Magma Copper Company

Gaylord W Dopson

A cylindrical grinding mill liner plate support comprising a base portion; means for securing the base portion to the shell of the grinding mill; replaceable corner bumpers detachably secured to each interior longitudinal edge of the base portion; and at least one side panel assembly, detachably secured to at least one side of the base portion. A cylindrical grinding mill liner comprising a plurality of liner plate supports placed in parallel courses along the longitudinal axis of the grinding mill which converts the heretofore circular cross-section of the hollow milling space into a polygonal, preferably square, cross-section.

Grinding mill liner plate support

A method and system of maintaining substantially steady state conditions in a froth flotation operation. In the method an aqueous pulp of finely ground ore particles continuously flows into a flotation cell and is continuously aerated by admission of air wherein aqueous pulp of flotation concentrates substantially continuously overflow from the cell. The novel and improved method step comprises continuously monitoring the mass flow of flotation concentrates from the cell and, accordingly, varying the admission of aeration air into the pulp in the cell inversely with respect to the variations in the mass flow of the overflow to achieve steady state conditions in the cell. The system contemplated for continuously maintaining a substantially steady state condition in a froth flotation operation includes at least one froth flotation cell into which flows an aqueous pulp of finely ground ore particles, and aeration means fluidically communicating with the flotation cell for delivering air thereto. The improved system comprises aeration control means operatively connected to the cell for receiving overflows of pulp of flotation concentrates from the cell, and being operatively connected to the aeration means for controlling the aeration means by inversely varying the delivery of air to the froth flotation cell in response to variations in the mass flow rate of the overflow of pulp of flotation concentrates to attain steady state conditions.

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Oracle, AZ, United States of America

Gaylord W Dopson