Method for extracting and recovering iron and nickel in metallic form
AssigneeBoliden Aktiebolag
InventorsPer Anders Herman Henningsson Fahlstrom, Thomas Konrad Mioen, Gotthard E. Bjorling
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Abstract
A method of extracting iron and nickel from sulphidic iron-nickel-materials and recover them in metallic form. The method comprises leaching the material with an acidic solution in presence of an oxidizing agent, so that substantially the whole quantity of the oxidizing agent is consumed. The obtained leaching liquid is then divided into two parts and one part is led to the cathode chamber, where iron and nickel is co-electro deposited and the other part is led to the anode chamber were the leaching liquid is regenerated before reuse.
Claims17
A method of extracting and recovering the iron and nickel content of sulphidic iron-nickel-materials in the form of an alloy comprising at least 15% by weight nickel comprising the steps of leaching the material with an acidic solution containing an oxidizing agent comprising trivalent iron, so that substantially the whole quantity of said oxidizing agent is consumed;
- leading a part of the leaching liquid obtained to the anode chamber of an electrolytic cell, which comprises separate cathode and anode chambers;
- regenerating in said anode chamber said oxidizing agent for re-use in the leaching step;
- leading the remaining part of said leaching liquid having a nickel/iron ratio of at least about 1:2 to the cathode chamber;
- co-electrodepositing the iron and nickel content in said leaching liquid on the cathode in said cathode chamber;
- separating the iron - nickel deposit obtained from said leaching liquid and returning said leaching liquid to the leaching step.
A method in accordance with claim 9, wherein the chloride ions are added partially in the form of calcium chloride.
Dependencies are inferred from the claim text.