Vale Inco Limited

Other

Vale Canada Limited

Companhia Vale Do Rio Doce

Flavia Dutra Mendes

Tiago Valentim Berni

Antonio Clareti Pereira

Indje Mihaylov

Ahmed Vahed

Mohamed Buarzaiga

Marc Murray Rishea

Indje Ognianov Mihaylov

Indje Ognianov Mihaylove

A method for recovering base metal values from oxide ore is provided by the present disclosure. The ore includes a first metal selected from the group consisting at least one of iron and aluminum and a second metal selected from the group consisting of at least one of nickel, cobalt and copper. The method includes the steps of: contacting the oxide ore with hydrogen chloride gas to obtain chlorides of the first and second metals and subjecting at least the first and second metals to pyrohydrolysis at a predetermined temperature to decompose the chlorides of the first metal into oxides. The method also includes the step of mixing the oxides of the first metal and the chlorides of the second metal in an aqueous solution to dissolve the chlorides of the second metal and recovering the dissolved ions of the second metal from the aqueous solution.

System and method for extracting base metal values from oxide ores

The process, according to the invention, comprises the following stages: (a) processing (1) of the laterite ore (O) by crushing, scrubbing, attrition, separation, and high-intensity magnetic separation; (b) Leaching (2) of the non-magnetic fraction (CN) obtained form the previous stage (a); (c) optionally, neutralization (3) of the effluent from the leaching and/or solid-liquid separation stages (4); (d) treatment of the effluents from stages (b) or (c) using an ion-exchange hybrid system (5) comprising at least one circuit for removal of impurities and at least one circuit for recovery of nickel and cobalt; (e) elution (6) of the ion-exchange resin used; (f) separation, purification, and recovery (7) of the nickel and cobalt.

Process for recovery of nickel and cobalt from laterite ores using ion exchange resin

A process for producing a purified nickel hydroxide precipitate from a nickel-containing leach solution with impurities including one or more of the following: manganese, copper, zinc, iron and/or cobalt, so that the purified nickel hydroxide is suitable for pelletization with iron-containing ores and/or stainless steel production, includes treating the leach solution with a base to form a slurry of mixed hydroxide precipitate and low-nickel barren solution, thickening the slurry to form filter cake, washing the filter cake and contacting it with acid to dissolve nickel and other metals to produce a concentrated nickel-containing solution, subjecting the concentrated nickel-containing solution to solvent extraction with an organic acid extractant to remove metals other than nickel from the nickel-containing solution and form a solvent extraction raffinate of purified nickel solution and treating the solvent extraction raffinate with a base to precipitate the purified nickel hydroxide precipitate.

Producing nickel hydroxide suitable for pelletization with iron-containing ore and for stainless steel manufacture

A hydrometallurgical resin-in-leach (RIL) process for directly recovering nickel and/or cobalt. Simultaneous pulp leaching by adding an acid or base, dissolves the metals of interest with adsorption of the metals rendered soluble in on ionic exchange resin. Following elution of the changed resin, purification of nickel and cobalt present in the eluate can be recovered by conventional methods, such as precipitation, extraction by solvents and membranes. The regenerated resin is recirculated for further use.

Resin-in-leach process to recover nickel and/or cobalt in ore leaching pulps

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Minas Gerais, Brazil

Flavia Dutra Mendes