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Disclosed is a mixing, milling, and aeration apparatus for the digestion of metal ore with bacteria. It includes a tank and a center post therein. At least one mixing blade extends radially from the center post. At least one roller is supported by a mixing blade, where each roller is configured to r

Disclosed is a mixing, milling, and aeration apparatus for the digestion of metal ore with bacteria. It includes a tank and a center post therein. At least one mixing blade extends radially from the center post. At least one roller is supported by a mixing blade, where each roller is configured to roll about the center of the tank while applying a crushing force to solids within the tank. At least one gas distributor, supported by a mixing blade, defines a plurality of holes through which gas is distributed to encourage mixing of the contents of the tank, to encourage distribution of oxygen through the contents, and to discourage fouling of the bottom of the tank and the rollers.

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1. A mixing, milling, and aeration apparatus for digesting metal ore with bacteria comprising: a tank configured to contain contents, said contents including solids and bacteria, said tank having a center, an interior bottom surface, and an interior wall, said interior bottom surface defining a tank

1. A mixing, milling, and aeration apparatus for digesting metal ore with bacteria comprising: a tank configured to contain contents, said contents including solids and bacteria, said tank having a center, an interior bottom surface, and an interior wall, said interior bottom surface defining a tank radius length;a center post supported by said interior bottom surface of said tank in an area proximate to said center;a plurality of mixing blades, each blade having a bottom blade edge, a fixed end, and a free end, each of said mixing blades defining a blade length, each of said fixed ends being attached to said center post, each of said mixing blades radially extending from said center post, said plurality of mixing blades being configured to revolve around said center and to mix said contents within said tank;at least one roller, each of said rollers defining a roller length essentially equal to said blade length, each of said rollers also defining a central bore aligned along a central roller axis, each of said rollers being supported by one of said mixing blades and being arranged to radially extend from said center post, each of said rollers being configured to roll in a forward roll direction about its respective central roller axis as said roller rolls along said interior bottom surface and as said plurality of mixing blades revolve around said center, each of said rollers being further configured to apply a crushing force to said solids while said solids rest along said interior bottom surface; andat least one gas distributor supported by at least one of said mixing blades, each of said gas distributors defining a distributor length essentially equal to said roller length, each of said gas distributors having a distributor top and a distributor bottom, said distributor bottom defining a plurality of holes, each of said gas distributors being arranged such that said plurality of holes are directed toward one of said rollers, said plurality of holes being configured to accommodate distribution of gas through said gas distributor into said contents of said tank;wherein said plurality of mixing blades revolves in a direction round said center and thereby mixes said contents while, simultaneously, gas is distributed via said at least one gas distributor so as to encourage mixing of said contents and distribution of oxygen through said contents and while, simultaneously, said at least one roller applies said crushing force to said solids on said interior bottom surface of said tank so as to discourage fouling of said interior bottom surface. 2. The mixing, milling, and aeration apparatus of claim 1, wherein each of said mixing blades has an advancing side and a retreating side; andeach of said gas distributors is attached to said retreating side of one of said mixing blades such that, as said at least one roller rolls along said interior bottom surface of said tank, said plurality of holes are oppositely directed relative to said roll direction. 3. The mixing, milling, and aeration apparatus of claim 1, wherein said plurality of holes are further configured to accommodate bringing said gas into contact with an exterior surface of one of said rollers; whereby when gas is distributed through said plurality of holes, material that has accumulated along said exterior surface of said rollers will leave said exterior surface so as to discourage fouling of said rollers. 4. The mixing, milling, and aeration apparatus of claim 1, wherein said plurality of holes are arranged in a uniformly-spaced alignment along said distributor bottom. 5. The mixing, milling, and aeration apparatus of claim 1, wherein each of said gas distributors is attached to one of said mixing blades in an area proximate to said bottom blade edge. 6. The mixing, milling, and aeration apparatus of claim 1, wherein each of said gas distributors tapers along part of its width to said distributor bottom, such that said distributor bottom's width is less than said distributor top's width. 7. A mixing, milling, and aeration apparatus for digesting metal ore with bacteria comprising: a tank configured to contain contents, said contents including solids and bacteria, said tank having a center, an interior bottom surface, and an interior wall, said interior bottom surface defining a tank radius length;a center post supported by said interior bottom surface of said tank in an area proximate to said center;a pair of mixing blades, each blade having a bottom blade edge, a fixed end, and a free end, each of said mixing blades defining a blade length, each of said fixed ends being attached to said center post and arranged such that both of said mixing blades align with one another, each of said mixing blades radially extending from said center post, said pair of mixing blades being configured to revolve around said center and to mix said contents within said tank;a pair of rollers, each of said rollers defining a roller length essentially equal to said blade length, each of said rollers also defining a central bore aligned along a central roller axis, each of said rollers being supported by one of said mixing blades and being arranged to radially extend from said center post, each of said rollers being configured to roll in a forward roll direction about its respective central roller axis as said roller rolls along said interior bottom surface and as said pair of mixing blades revolve around said center, each of said rollers being further configured to apply a crushing force to said solids while said solids rest along said interior bottom surface; anda pair of gas distributors, each of said gas distributors being supported by at least one of said mixing blades, each of said gas distributors defining a distributor length essentially equal to said roller length, each of said gas distributors having a distributor top and a distributor bottom, said distributor bottom defining a plurality of holes, each of said gas distributors being arranged such that said plurality of holes are directed toward one of said rollers, said plurality of holes being configured to accommodate distribution of gas through said gas distributor into said contents of said tank; wherein said pair of mixing blades revolves in a direction round said center and thereby mixes said contents while, simultaneously, gas is distributed via said pair of gas distributors so as to encourage mixing of said contents and distribution of oxygen through said contents and while, simultaneously, said pair of rollers apply said crushing force to said solids on said interior bottom surface of said tank so as to discourage fouling of said interior bottom surface. 8. The mixing, milling, and aeration apparatus of claim 7, wherein each of said mixing blades has an advancing side and a retreating side; andeach of said gas distributors is attached to said retreating side of one of said mixing blades such that, as said pair of rollers roll along said interior bottom surface of said tank, said plurality of holes are oppositely directed relative to said roll direction. 9. The mixing, milling, and aeration apparatus of claim 7, wherein said plurality of holes are further configured to accommodate bringing said gas into contact with an exterior surface of one of said rollers; whereby when gas is distributed through said plurality of holes, material that has accumulated along said exterior surface of said rollers will leave said exterior surface so as to discourage fouling of said rollers. 10. The mixing, milling, and aeration apparatus of claim 7, wherein said plurality of holes are arranged in a uniformly-spaced alignment along said distributor bottom. 11. The mixing, milling, and aeration apparatus of claim 7, wherein each of said gas distributors is attached to one of said mixing blades in an area proximate to said bottom blade edge. 12. The mixing, milling, and aeration apparatus of claim 7, wherein each of said gas distributors tapers along part of its width to said distributor bottom, such that said distributor bottom's width is less than said distributor top's width. 13. A mixing, milling, and aeration apparatus for digesting metal ore with bacteria comprising: a tank configured to contain a slurry of mineral-containing ore and process liquid at an acidic pH level, said tank having a center, an interior bottom surface, and an interior wall, said interior bottom surface defining a tank radius length;a center axel post supported by said tank;a bearing attached to said central axel post;a central shaft cylinder supported by said bearing, said central shaft cylinder at least partially surrounding said central axel post, said central shaft cylinder being configured so as to accommodate rotation of said central shaft cylinder around said central axel post, said central shaft cylinder being further configured so that said central shaft cylinder hangs from said bearing so that there is a clearing between said interior bottom and said central shaft cylinder;at least one mixing blade having a bottom blade edge, a fixed end, and a free end, each of said mixing blades defining a blade length, said fixed end of each of said mixing blades being attached to said center shaft cylinder, each of said mixing blades radially extending from said center shaft cylinder, each of said mixing blades being configured to revolve around said center and to mix said slurry within said tank;at least one shaft supported by said central shaft cylinder and extending radially from said central shaft cylinder and being essentially parallel to one of said mixing blades;at least one roller, each of said rollers defining a roller length essentially equal to said blade length, each of said rollers also defining a central bore aligned along a central roller axis, each of said rollers being supported by one of said mixing blades and being arranged to radially extend from said central shaft cylinder such that each of shafts extends through said central bore of each of said rollers, each of said rollers being configured to roll in a forward roll direction about its respective central roller axis as said roller rolls along said interior bottom surface and as said plurality of mixing blades revolve around said center, each of said rollers being further configured to apply a crushing force to said mineral-containing ore while said mineral containing ore rests along said interior bottom surface, each of said central bores being configured to accommodate vertical movement of said roller with respect to said shaft; andat least one gas distributor supported by at least one of said mixing blades, each of said gas distributors defining a distributor length essentially equal to said roller length, each of said gas distributors having a distributor top and a distributor bottom, said distributor bottom defining a plurality of holes, each of said gas distributors being arranged such that said plurality of holes are directed toward one of said rollers, said plurality of holes being configured to accommodate distribution of gas through said gas distributor into said slurry within said tank;wherein said at least one mixing blade revolves in a direction round said center and thereby mixes said contents while, simultaneously, gas is distributed via said at least one gas distributor so as to encourage mixing of said slurry and distribution of oxygen through said slurry and while, simultaneously, said at least one roller applies said crushing force to said mineral-containing ore on said interior bottom surface of said tank so as to discourage fouling of said interior bottom surface. 14. The mixing, milling, and aeration apparatus of claim 13, wherein each of said mixing blades has an advancing side and a retreating side; andeach of said gas distributors is attached to said retreating side of one of said mixing blades such that, as said at least one roller rolls along said interior bottom surface of said tank, said plurality of holes are oppositely directed relative to said roll direction. 15. The mixing, milling, and aeration apparatus of claim 13, wherein said plurality of holes are further configured to accommodate bringing said gas into contact with an exterior surface of one of said rollers; whereby when gas is distributed through said plurality of holes, material that has accumulated along said exterior surface of said rollers will leave said exterior surface so as to discourage fouling of said rollers. 16. The mixing, milling, and aeration apparatus of claim 13, wherein said plurality of holes are arranged in a uniformly-spaced alignment along said distributor bottom. 17. The mixing, milling, and aeration apparatus of claim 13, wherein each of said gas distributors is attached to one of said mixing blades in an area proximate to said bottom blade edge. 18. The mixing, milling, and aeration apparatus of claim 13, wherein each of said gas distributors tapers along part of its width to said distributor bottom, such that said distributor bottom's width is less than said distributor top's width.