Abstract: Materials and methods for precious metal recovery are disclosed. Usable leaching solutions are preferably aqueous based and include appropriate materials in sufficient quantities to solubilize and stabilize precious metal. Such materials typically include oxidant material. Some or all of the oxidant material can be, in some instances, generated in-situ. The leaching solution is typically contacted with a substrate having a target precious metal, thereby solubilizing precious metal to form a stable, pregnant solution. The precious metal can then be recovered from the pregnant solution. In some instances, components of the leaching solution can be regenerated and reused in subsequent leaching.

Abstract: Materials and methods for precious metal recovery are disclosed. Usable leaching solutions are preferably aqueous based and include appropriate materials in sufficient quantities to solubilize and stabilize precious metal. Such materials typically include phosphoric acid and an oxidant material. Some or all of the oxidant material can be, in some instances, generated in-situ. The leaching solution is typically contacted with a substrate having a target precious metal, thereby solubilizing precious metal to form a stable, pregnant solution. The precious metal can then be recovered from the pregnant solution. In some instances, components of the leaching solution can be regenerated and reused in subsequent leaching.

Abstract: Materials and methods for precious metal recovery are disclosed. Usable leaching solutions are preferably aqueous based and include appropriate materials in sufficient quantities to solubilize and stabilize precious metal. Such materials typically include oxidant material. Some or all of the oxidant material can be, in some instances, generated in-situ. The leaching solution is typically contacted with a substrate having a target precious metal, thereby solubilizing precious metal to form a stable, pregnant solution. The precious metal can then be recovered from the pregnant solution. In some instances, components of the leaching solution can be regenerated and reused in subsequent leaching.

Abstract: A centrifuge bowl has a bottom accelerator for accelerating the materials from a feed duct extending into the bowl. The accelerator is a molded body having a top plate with a central hole arranged to receive the materials from the bottom feed mouth of the duct and a plurality of vanes underneath the top plate, each vane extending generally outwardly from an inner nose underneath an outer edge of the hole to an outer end at an outer edge of the top plate. The vanes each have a bottom surface lying in an imaginary bottom surface of the molded body which is conical and contains fasteners arranged to be fastened to the conical bottom wall of the bowl. A deflector plate lies underneath the hole with a bottom surface spaced from the imaginary bottom surface and intersecting the height of the vanes.

Abstract: A centrifuge bowl for separating heavier particles from lighter particles and water comprises a first conical bowl wall leading to a pair of annular recesses at actually spaced positions. Each recess is generally V-shaped with an upper side wall, a lower side wall and a base. The base contains a plurality of angularly spaced discharge ducts each having a pinch valve by which it can be closed and mouth projecting through the base into the interior of the bowl for collecting the heavier particles. Each recess includes injection openings in the upper and lower side walls of the recess arranged to inject fluidizing water in a direction generally parallel to the base and across the mouth of each discharge duct. An insert member formed by two annular screens can be inserted into the recess radially inwardly of the discharge and injection holes and contains a bed of beads which act to float inwardly while the valves are closed and to collapse outwardly when the valves are opened.

Abstract: A centrifuge bowl has a bottom accelerator for accelerating the materials from a feed duct extending into the bowl. The accelerator is a molded body having a top plate with a central hole arranged to receive the materials from the bottom feed mouth of the duct and a plurality of vanes underneath the top plate, each vane extending generally outwardly from an inner nose underneath an outer edge of the hole to an outer end at an outer edge of the top plate. The vanes each have a bottom surface lying in an imaginary bottom surface of the molded body which is conical and contains fasteners arranged to be fastened to the conical bottom wall of the bowl. A deflector plate lies underneath the hole with a bottom surface spaced from the imaginary bottom surface and intersecting the height of the vanes.