Low temperature reduction of metal oxides
AssigneeKinaltek Pty. Ltd.
InventorsJawad Haidar, Bilal Khan, Rajan Gnanarajan
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Abstract
Disclosed herein is a method for reducing a metal oxide in a metal oxide containing precursor. The method comprises providing a reaction mixture comprising the metal oxide containing precursor and an aluminium reductant; heating the reaction mixture in the presence of solid or gaseous aluminium chloride to a temperature at which reactions that result in the metal oxide being reduced are initiated; controlling reaction conditions whereby the reaction mixture is prevented from reaching a temperature at which thermal runaway can occur; and isolating reaction products that include reduced metal oxide.
Claims33
A method for producing a powder of a reduced metal oxide, the method comprising:
- providing a reaction mixture comprising a metal oxide containing precursor and an aluminium reductant;
- heating the reaction mixture at atmospheric pressure in the presence of solid or gaseous aluminium chloride to a temperature at which reactions that result in the metal oxide being reduced are initiated, the amount of the aluminium chloride being between 1 wt % and 500 wt % of the weight of the amount needed to reduce all the metal oxide to pure metals as per McOx+Al+AlCl3→Mc-Al+AlOCl, where the metal oxide is McOx and the reduced metal oxide is Mc;
- controlling reaction conditions whereby the reaction mixture is prevented from reaching a temperature at which thermal runaway can occur and whereby the formation of aluminium oxychloride as a by-product is favoured over aluminium oxide;
- and
- isolating reaction products in the form of a powder that comprises Mc, and AlOCl or Al2O3 or a mixture of AlOCl and Al2O3.
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A method for reducing a metal oxide in a metal oxide containing precursor, the method comprising:
- providing a reaction mixture comprising the metal oxide containing precursor and a magnesium reductant;
- heating the reaction mixture in the presence of solid or gaseous aluminium chloride to a temperature at which reactions that result in the metal oxide being reduced are initiated;
- controlling reaction conditions whereby the reaction mixture is prevented from reaching a temperature at which thermal runaway can occur;
- and
- isolating reaction products that include reduced metal oxide.
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Dependencies are inferred from the claim text.