Hematite precipitation at elevated temperature and pressure

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 3/20 (2006.01)

Patent

CA 2641919

A hydrometallurgical method (10) for precipitating iron as hematite at elevated temperature and pressure from a pregnant leach solution ("PLS") (12) containing nickel, cobalt and iron, the method comprising the steps of: (i) leaching a low to medium grade nickel laterite ore to produce a PLS (12) containing nickel, cobalt and ferric iron; (ii) subjecting the PLS (12) to elevated temperatures and pressures for a time sufficient to precipitate iron as hematite; (iii) passing the product of step (ii) through a solids/liquid separation circuit (26) to substantially remove the hematite precipitate, and produce a substantially iron-free, acid containing solution; and (iv) recovering nickel and cobalt from the final substantially iron-free, acid containing solution.

L'invention concerne un procédé hydrométallurgique (10) de précipitation à haute température et haute pression de fer sous la forme d'hématite dans une solution (12) chargée de lixiviation ("PLS") qui contient du nickel, du cobalt et du fer. Le procédé comprend les étapes qui consistent (i) à lixivier un minerai qui contient de la latérite à teneur basse à moyenne en nickel de manière à obtenir une PLS (12) qui contient du nickel, du cobalt et du fer ferrique, (ii) à soumettre la PLS (12) à une haute température et à une haute pression pendant une durée suffisante pour précipiter le fer sous la forme d'hématite, (iii) à faire passer le produit de l'étape (ii) dans un circuit (26) de séparation solides-liquide de manière à retirer sensiblement tout le précipité d'hématite et à produire une solution qui contient de l'acide mais qui est sensiblement exemple de fer et (iv) à récupérer le nickel et le cobalt de la solution finale qui contient de l'acide et qui est sensiblement dépourvue de fer.

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