Nordic Mining Asa

Institutt for Energiteknikk

Asunción Aranda

Johann Mastin

A process for alumina and carbonate production from aluminium rich materials with integrated COutilization, comprising: comminuting and leaching Al-rich materials in concentrated HCl; separating unreacted material from metal chloride solution; separating Alfrom solution by crystallization of AlCl.6HO; calcination of AlCl.6HO with HCl recovery; precipitation of metal carbonates from CO; regeneration of HCl and extractive amines; the Alseparation the facilitated by increasing HCl concentration; the calcination being performed in two steps, one in the range 400 and 600&#xb0; C. to generate a HCl-rich gas and one above 600&#xb0; C. to produce AlO; for precipitating metal carbonates, mixing the metal chloride solution with an organic solution containing a selected amine and contacting the mixture with a CO-containing gas, thereby also extracting HCl by formation of an ammonium chloride salt complex; processing thermally or chemically the organic solution to regenerate the amine for recirculation.

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Oslo, Norway

Asunción Aranda