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| Number | Title | Issue Date |
| 6309615 | Process for removing reactive silica from a bayer process feedstock A process for the removal of reactive silica from a feedstock to the digestion step of the Bayer process for the manufacture of alumina, in which (a) the feedstock is contacted with a caustic liquor under process conditions which result in dissolving and ... | 10/30/2001 |
| 5812587 | Apparatus and method for the supply of molten metal The present invention is concerned with an apparatus for supply of molten metal including a holding furnace pivotable about an axis having a metal chamber for holding molten metal, an outlet for supplying molten metal from said chamber and an inlet well c... | 09/22/1998 |
| 5665213 | Continuous prebaked anode cell A support structure for supporting continuous prebaked anodes in an aluminium smelting cell comprises a pair of side plates (3) and a pair of end plates (4) connected together to form an enclosed superstructure. The supporting structure includes at least ... | 09/09/1997 |
| 5529761 | Production of low soda alumina A process is disclosed for the production of alumina by the Bayer process, including a precipitation process having an agglomeration stage and a growth stage in which the precipitation slurry is passed through a multiplicity of growth tanks. In the agglom... | 06/25/1996 |
| 5503220 | Heating and/or cooling of vessels An apparatus for heating or cooling solid suspension slurry. The apparatus comprises a vessel (1) for containing the slurry and a draft means contained within a draft section of a draft tube (2) to circulate and maintain the suspension. Extending substant... | 04/02/1996 |
| 5502743 | High temperature furnace A furnace configuration is disclosed in which the furnace is inductively heated by external insulated coils and a susceptor is placed within the charge of reactants away from the outer surfaces of the charge. Consequently, heat is transferred to the charg... | 03/26/1996 |
| 5477906 | Casting of metal objects A mould assembly comprising mould segments of generally non-thermally conductive material which define a mould cavity is upwardly filled with liquid metal through at least one in-gate. A thermal extraction member of a high thermally conductive material co... | 12/26/1995 |
| 5476574 | Continuous alumina feeder A continuous feeder for feeding alumina to an aluminum reduction cell is positioned over a discharge outlet (114) of an alumina hopper. The feeder includes a flow control valve member (140) which is connected to a positioning means (132) by rod (142). The... | 12/19/1995 |
| 5456808 | Method for operating a continuous prebaked anode cell by locating resistance reducing materials to control the rate of heat extraction A support structure for supporting continuous prebaked anodes in an aluminium smelting cell comprises a pair of side plates (3) and a pair of end plates (4) connected together to form an enclosed superstructure. The supporting structure includes at least ... | 10/10/1995 |
| 4713203 | Bauxite proppant A superior proppant having very high permeability at formation pressures up to 20,000 psi, very high compressive strength, low specific gravity, and good acid resistance, is produced by a process comprising: (a) separating a fine fraction from a naturally... | 12/15/1987 |
| 4668485 | Recovery of sodium aluminate from Bayer process red mud A process for recovery of valuable products from Bayer process red mud comprises the steps: (a) digesting red mud with sulphur dioxide in the presence of water to dissolve soda, alumina and silica therein; (b) heating the product of step (a), with or with... | 05/26/1987 |
