Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1974-12-31
1977-01-11
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
241 20, C22B 100
Patent
active
040024628
ABSTRACT:
A dry milling process for separating a mineral values bearing component from the sand grains or gangue materials of sedimentary formations. The ores are crushed, ground and screened until the bulk of material is of a size corresponding to or slightly larger than the predominant size of the sand grain particles embedded in the deposit. After or before complete sizing the ore charge may be heated and dried if required before being directionally impelled and abraded. Further applied forces and guidance components distribute the materials to provide a curtain type flow pattern of directed movement that may be at least partially dependent on a primary fluid flow pattern. Materials moving in the directed curtain pattern are intercepted and, in effect, washed by a secondary or cross current flow of pressurized fluid that is of a sufficient density and velocity to loosen, suspend and differentially move dust constituents and the smallest particulate materials away from the curtain flow pattern while particles of larger size substantially continue to move in the original flow direction. The mineral values constituents are removed with the other dust materials from the cross current fluid carrier by filters. Multi-stage operation is contemplated, at each step of which the sand grain particle size is further reduced by the impact abrading step to free further mineral values materials.
In apparatus embodiments a horizontally disposed spinner impeller impacts the particles against circumferential wear plates as fan blades on the spinner direct air outwardly and downwardly to supplement first the abrading action and, secondly, the forces of gravity so the materials are caused to fall in the desired curtain pattern. The intercepting cross current fluid is provided by variable speed air blowers.
REFERENCES:
patent: 3485487 (1969-12-01), Bennett
Messenger C. B.
Rosenberg Peter D.
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