A method of processing copper and nickel sulfide materials, including oxidizing torrefaction of a material to obtain cinder, leaching the cinder with a cycling solution, separating a leaching residue, and electro-extraction of copper from a leaching solution. The cinder and particulates generated by the torrefaction are separately leached. The particulates are leached in a cycling copper raffinate together with a separated portion of solution from a cinder processing line, the separated portion consisting of a portion of solution provided to the leaching after electro-extraction of copper. Particulates leaching residue is separated. Copper is extracted by solvent extraction from a particulates leaching solution, followed by separate electro-extraction of copper from a circulating re-extract. Then, a portion of the raffinate is separated to be forwarded to a nickel production process.

The problem of high rate electrodeposition of metals such as copper during electrowinning operations or high rate charging of lithium or zinc electrodes for rechargeable battery applications while avoiding the adverse effects of dendrite formation such as causing short-circuiting and/or poor deposit morphology is solved by pulse reverse current electrodeposition or charging whereby the forward cathodic (electrodeposition or charging) pulse current is “tuned” to minimize dendrite formation for example by creating a smaller pulsating boundary layer and thereby minimizing mass transport effects leading to surface asperities and the subsequent reverse anodic (electropolishing) pulse current is “tuned” to eliminate the micro- and macro-asperities leading to dendrites.

A process to recover nickel, cobalt and copper by co-processing copper-containing sulphide concentrate feed containing one or more of arsenic, antimony, and bismuth, and laterite ore feed containing nickel and cobalt by pressure oxidative leaching. The sulphide concentrate and oxygen are controlled to produce sulphuric acid to leach nickel, cobalt, copper and acid soluble impurities into a liquid phase of an acidic leach slurry, to precipitate iron compounds and a majority of the arsenic, antimony and bismuth as solids, and to produce heat to heat the incoming feeds to a temperature above 230° C. Reacted slurry is withdrawn, solids are separated, and the PLS solution contains the nickel, cobalt, copper and acid soluble impurities. A first solution purification stage on the PLS neutralizes free acid, precipitates one or more of iron, aluminum, chromium and silicon, and, separates as solids, the precipitated impurities and other solids from a first purified solution. Copper is separated from the first purified solution with a solvent extraction step to produce a raffinate solution reduced in copper and a copper loaded organic phase. The organic phase is stripped and copper is recovered with electrowinning. A second solution purification stage is conducted on the raffinate by one or both of neutralizing free acid and precipitating one or more of iron, aluminum, chromium and silicon, followed by separating as solids, the precipitated impurities and other solids from a second purified solution. Nickel and cobalt are recovered as mixed hydroxides or mixed sulphides from the second purified solution.

An edge protector 1 mountable to a cathode plate 2, the edge protector 1 comprising a set of elongate channels 3. Each elongate channel 10, 20, 30 defining a slot. The set of elongate channels 3 including a first and second channel 10, 20 adapted to receive and cover respective side edges 4a, 4c of the cathode plate 2, and a third channel 30 adapted to receive and cover a lower edge 4b of the cathode plate 2. The first, second and third channels 10, 20, 30 being channels of a first, second and third body 12, 22, 32 respectively. Wherein, the edge protector 1 further includes a first and a second insert 40a-b. The first insert 40a being adapted to be inserted into or over a feature 14 of a first end 16a of the first body 12 and a feature 24a of a first end 26a of the second body 22 to form a first corner 6a. The second insert 40b being adapted to be inserted into or over a feature 24b of a second end 26b of the second body 22 and a feature 34 of a first end 36a of the third body 32 to form a second corner 6b. The first and second corners 6a-b are overmoulded with a first and second mouldable material respectively. The first corner 6a being separately overmoulded to the second corner 6b.

An apparatus for stripping metal (12, 14) deposited on a cathode plate (16), comprises a first robotic arm (46) carrying a first stripping apparatus (40), the first stripping apparatus having a first gripping apparatus (62, 63) to grip the cathode plate such that the first robotic arm operates to lift the cathode plate out of the stripping station following stripping of the metal sheets from the cathode plate. A second robotic arm (48) carrying a second stripping apparatus (42) is located on a second side of the cathode plate, the second stripping apparatus having a second gripping apparatus (76, 77) for gripping one or both of the first sheet of metal (12) and the second sheet of metal (14). The second robotic arm can be operated to move the first sheet of metal and the second sheet of metal to a metal storage region following stripping from the cathode plate (16). The metal is stripped from the cathode plate without breaking the bridge of metal that interconnects the first sheet of metal and the second sheet of metal.

In a method for electrochemical ammunition disposal and material recovery, ammunition cartridges are placed in an acidic aqueous solution that is in contact with a cathode and an anode. The ammunition cartridges have a casing that includes an alloy of copper and zinc. The ammunition cartridges are agitated in the acidic aqueous solution as a voltage is applied between the anode and the cathode. The applied voltage is effective to oxidize and dissolve zinc from the copper-zinc alloy. Copper metal derived from the alloy can be recovered as a solid, and zinc ion derived from the alloy can be recovered as a solution.

In a method for electrochemical ammunition disposal and material recovery, ammunition cartridges are placed in an acidic aqueous solution that is in contact with a cathode and an anode. The ammunition cartridges have a casing that includes an alloy of copper and zinc. The ammunition cartridges are agitated in the acidic aqueous solution as a voltage is applied between the anode and the cathode. The applied voltage is effective to oxidize and dissolve zinc from the copper-zinc alloy. Copper metal derived from the alloy can be recovered as a solid, and zinc ion derived from the alloy can be recovered as a solution.

The invention relates to an electrode which can be employed in the cells of plants for the electrolytic extraction of copper and other non-ferrous metals from ionic solutions. The electrode consists of an apparatus comprising at least one anodic panel for the evolution of oxygen or chlorine connected through a plurality of resistors in parallel to at least one distribution structure for electrical current. The panel may optionally exhibit areas of electrical discontinuity. The invention also relates to an electrolyser using the electrode described above.

The invention relates to an electrode which can be employed in the cells of plants for the electrolytic extraction of copper and other non-ferrous metals from ionic solutions. The electrode consists of an apparatus comprising at least one anodic panel for the evolution of oxygen or chlorine connected through a plurality of resistors in parallel to at least one distribution structure for electrical current. The panel may optionally exhibit areas of electrical discontinuity. The invention also relates to an electrolyser using the electrode described above.

A method is disclosed for manufacturing a cathode for electrolytic processes, the cathode comprising a conducting bar and a plate attached to the conducting bar, wherein the conducting bar has a conducting member attached thereto to increase the conductivity of the conducting bar.