Electrolytic cell
AssigneeSaint-Gobain Centre De Recherches Et D'Etudes Europeen
InventorsEric Jorge, Olivier Francy, Olivier Panagiotis
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Abstract
The present disclosure relates to an electrolytic cell for the production of aluminium by reducing alumina. The cell may comprise a sidewall including at least one side block. The side block may comprise an aluminous material having an apparent porosity of less than about 10% and a composition, as a weight percentage on the basis of the aluminous material and for a total of about 100%, such that: Al2O3>about 50%, beta-alumina being less than about 20% of the weight of the aluminous material, oxides that are less reducible than alumina at 1000° C.<about 50%, Na2O<about 3.9%, and other components<about 5%.
Claims51
An electrolytic cell for the production of aluminum by reduction of alumina, said cell containing an electrolyte bath and having a side wall that comprises at least one side block, said side block comprising an aluminous material having
- an open porosity of less than 10%, and
- a composition, as a weight percentage on the basis of the aluminous material and for a total of 100%, such that:
- Al2O3 >50%, beta-alumina representing less than 20% of the weight of the aluminous material,
- oxides that are less reducible than alumina at 1000° C.:
- <46%,
- Na2O <3.9%,
- other constituents <2%,
- said composition of the aluminous material being such that:
- Al2O3+MgO +CaO >95%.
An electrolytic cell for the production of aluminum by reduction of alumina, said cell containing an electrolyte bath and having a side wall that comprises at least one side block, said side block comprising an aluminous material having
- an open porosity of less than 10%, and
- a composition, as a weight percentage on the basis of the aluminous material and for a total of 100%, such that:
- Al2O3 >50%, beta alumina representing less than 20% of the weight of the aluminous material,
- oxides that are less reducible than alumina at 1000° C.:
- <46%,
- Na2O <3.9%,
- other constituents <5%,
- wherein MgO >28%.
An electrolytic cell for the production of aluminum by reduction of alumina, said cell containing an electrolyte bath and having a side wall that comprises at least one side block, said side block comprising an aluminous material having
- an open porosity of less than 10%, and
- a composition, as a weight percentage on the basis of the aluminous material and for a total of 100%, such that:
- Al2O3 >50%, beta alumina representing less than 20% of the weight of the aluminous material,
- oxides that are less reducible than alumina at 1000° C.:
- <46%,
- Na2O <3.9%,
- other constituents <5%,
- wherein CaO >1%.
An electrolytic cell for the production of aluminum by reduction of alumina, said cell containing an electrolyte bath and having a side wall that comprises at least one side block, said side block comprising an aluminous material having
- an open porosity of less than 10%, and
- a composition, as a weight percentage on the basis of the aluminous material and for a total of 100%, such that:
- Al2O3>50%, beta-alumina representing less than 20% of the weight of the aluminous material,
- oxides that are less reducible than alumina at 1000° C.:
- <46%,
- Na2O <3.9%,
- other constituents <1%,
- said composition of the aluminous material being such that:
- Al2O3+MgO +CaO >95%.
An electrolytic cell for the production of aluminum by reduction of alumina, said cell containing an electrolyte bath and having a side wall that comprises at least one side block, said side block comprising an aluminous material having
- an open porosity of less than 10%, and
- a composition, as a weight percentage on the basis of the aluminous material and for a total of 100%, such that:
- Al2O3 >50%, beta-alumina representing less than 20% of the weight of the aluminous material,
- oxides that are less reducible than alumina at 1000° C.:
- <46%,
- Na2O <3.9%,
- other constituents <5%,
- said composition of the aluminous material being such that:
- Al2O3+MgO+CaO>95%,
- wherein the total content of copper, tin, boron, phosphorus, chromium and zinc oxides is less than 2%.
An electrolytic cell for the production of aluminum by reduction of alumina, said cell containing an electrolyte bath and having a side wall that comprises at least one fused side block, said side block comprising an aluminous material having
- an open porosity of less than 10%, and
- a composition, as a weight percentage on the basis of the aluminous material and for a total of 100%, such that:
- Al2O3>50%, beta-alumina representing less than 20% of the weight of the aluminous material,
- oxides that are less reducible than alumina at 1000° C.:
- <46%,
- Na2O <3.9%,
- other constituents <5%,
- said composition of the aluminous material being such that:
- Al2O3+MgO +CaO >95%.
Dependencies are inferred from the claim text.