Institutt for Energiteknikk

Nordic Mining Asa

Johann Mastin

Arne Raaheim

Julien Meyer

Asunción Aranda

Asuncion Aranda

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.

Alumina and carbonate production method from AI-rich materials with integrated CO2 utilization

A particulate, heterogeneous solid COabsorbent composition, comprising decomposition products of CaAlOafter having been heated to a temperature between 500&#xb0; C. and 925&#xb0; C. in the presence of HO and COfor a period of time sufficient to allow the CaAlOto react and form the particulate, heterogeneous absorbent composition which exhibits a higher concentration of aluminum than calcium in the particle core but a higher concentration of calcium than aluminum at the particle surface. The invention also comprises a method for preparing the particulate, heterogeneous product as well as a method for utilizing the composition for separating COfrom a process gas.

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Stavanger, Norway

Johann Mastin