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Cobalt recovery process

a recovery process and cobalt technology, applied in cobalt compounds, nickel compounds, inorganic chemistry, etc., can solve the problem that iron carbonyl cannot be completely separated from nickel carbonyl

Inactive Publication Date: 2001-08-09
CVMR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in contrast, iron carbonyl cannot be completely separated from nickel carbonyl because these compounds form an inseparable isotropic mixture.

Method used

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  • Cobalt recovery process
  • Cobalt recovery process
  • Cobalt recovery process

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[0063] A mixture of Ni, Fe, Co oxides in amounts Ni (85 Kg), Fe (1 kg), Co (12 Kg) and a 3 Kg mixture of other metal oxides (Cr, Mn, Cu, Zn) (14) was reduced with CO / H.sub.2 mixture (12) as described in GB Patent Nos. 323,332 and 324,382. The chamber was then purged with either argon or nitrogen and the temperature of the reduced mixture of metals was lowered to 80-90.degree. C. Carbon monoxide gas was then passed through the mixture of reduced metals, under 10-20 bar pressure to produce metal carbonyls (16). Resultant nickel carbonyl, iron carbonyl and CO mixture was passed through the chemical vapour deposition (CVD) reclaim system (20) and metal carbonyl-depleted CO recycled into vessel (16). At temperatures of less than 100.degree. C., the cobalt carbonyl appears to remain as a coat on the surface of the cobalt metal to significantly reduce the cobalt carbonylation reaction rate. The concentration of Fe(CO).sub.5 and Ni(CO).sub.4 in the gas mixture was monitored to ensure essent...

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Abstract

A process for producing purified cobalt from a mixture comprising metallic species of cobalt and metallic species of at least one of the group consisting of nickel and iron, comprising producing a metal carbonyl mixture of cobalt carbonyl and at least one of nickel carbonyl and iron carbonyl from the metallic species mixture; separating the nickel carbonyl and / or iron carbonyl from the cobalt carbonyl; treating the cobalt carbonyl with an effective amount of a complexing gaseous mixture of nitric oxide / carbon monoxide to produce cobalt nitrosyl tricarbonyl; and decomposing the purified cobalt nitrosyl carbonyl to provide purified cobalt and regenerated complexing gaseous mixture for recycle. The process provides cobalt of improved quality in an optionally, continuous and closed-loop manner. Preferred processes include either aqueous and / or gaseous process steps.

Description

[0001] This application claims priority to Canadian Patent Application No. 2,296,964, filed on Jan. 25, 2001, the complete disclosure of which is incorporated herein by reference.[0002] This invention relates to a method and apparatus for the recovery of cobalt from impure cobalt, particularly from cobalt containing minerals, ores, scrap, slag, concentrates, metallurgical intermediates and by-products and, more particularly, nickel- and iron-containing materials.BACKGROUND OF INVENTION[0003] It is well-known that metals such as, for example, nickel and iron can be recovered from reduced metal-containing mixtures, using carbonylation processes. Volatile nickel and iron carbonyls are formed at elevated temperatures and pressures, separated, isolated and thermally decomposed to yield pure metal pellets and carbon monoxide gas. The purity of the nickel metal produced by this process is extremely high because of the selectivity of the carbonylation reaction and the fact that other metals...

Claims

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Application Information

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IPC IPC(8): C01G51/00C01G51/02C22B3/44C22B5/20C22B23/00C22B23/06
CPCC01G51/00C22B23/0476C22B23/065
Inventor TEREKHOV, DMITRI S.
Owner CVMR CORP
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