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公开(公告)号：US06248302B1
公开(公告)日：2001-06-19
申请号：US09497909
申请日：2000-02-04
IPC分类号： C01G4900
CPC分类号： C01G23/00 , C01G23/04 , C01G49/00 , C01G49/02 , C22B3/44 , C22B7/007 , C22B34/12 , Y02P10/234
摘要： A method for processing red mud to recover iron, aluminum, silicon and titanium metal values therefrom the method comprising the steps of adding the red mud to a digester containing an acid to provide a mixture of acid and red mud and heating the mixture to dissolve soluble compounds of at least one of iron, aluminum, silicon and titanium to provide a digest containing dissolved salts of the soluble compounds and to provide a gas component. Thereafter, the digest is treated with water to dissolve water soluble salts therein to provide a slurry comprised of a liquid containing water and the dissolved soluble salts and a solid component comprised of silica. The solid component is separated from the liquid and the pH of the liquid is adjusted to form an aluminate and an iron-containing precipitate. The iron-containing precipitate is separated from the liquid to provide an iron-depleted liquid whose pH is adjusted to precipitate aluminum trihydrate which is separated from the iron-depleted liquid to provide an aluminum trihydrate-depleted liquid. The pH of the aluminum trihydrate-depleted liquid is adjusted to form a precipitate comprised of at least one remaining salt in the aluminum trihydrate-depleted liquid to provide a salt-depleted liquid. The salt precipitate is separated from the salt-depleted liquid thereby recovering the metal values from the red mud.
摘要翻译： 一种处理赤泥以回收铁，铝，硅和钛金属值的方法，包括以下步骤：将红泥添加到含酸的蒸煮器中，以提供酸和红泥的混合物，并加热混合物以溶解可溶的 铁，铝，硅和钛中的至少一种的化合物，以提供含有可溶性化合物的溶解盐的消化物并提供气体组分。 此后，用水处理消化物以溶解其中的水溶性盐，以提供由含有水的溶液和溶解的可溶性盐以及由二氧化硅组成的固体组分的淤浆。 将固体组分与液体分离，并调节液体的pH以形成铝酸盐和含铁沉淀物。 将含铁沉淀物与液体分离以提供贫铁液体，其pH被调节以沉淀三水合铝，其与贫铁液体分离以提供三水合铝贫液体。 调节三水合铝酸液体的pH以在三水合铝贫液体中形成由至少一种剩余的盐组成的沉淀物以提供贫盐液体。 将盐沉淀物与贫盐液体分离，从而从红泥中回收金属值。
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公开(公告)号：US06231822B1
公开(公告)日：2001-05-15
申请号：US09201195
申请日：1998-11-30
IPC分类号： C01F100
CPC分类号： C01B7/191 , C01C1/244 , C01F5/22 , C01F7/141 , C01F7/50 , C01F7/56 , C01F11/24 , C01F11/46 , C03C1/002 , C04B7/24 , C04B18/0481 , C04B33/1324 , C04B33/1325 , C04B33/138 , C04B35/185 , C04B35/62204 , C04B2235/3217 , C04B2235/402 , C04B2235/445 , C04B2235/448 , C22B21/0046 , C22B21/0069 , Y02P10/212 , Y02P20/129 , Y02P40/145 , Y02P40/69 , Y02W30/91 , C04B20/023
摘要： A method of recovering chloride and sulfate salts from spent potliner using acid digestion.
摘要翻译： 使用酸消解从废锅炉中回收氯化物和硫酸盐的方法
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公开(公告)号：US06811676B2
公开(公告)日：2004-11-02
申请号：US10195733
申请日：2002-07-16
IPC分类号： C25C308
摘要： An electrolytic cell for producing aluminum from alumina having a reservoir for collecting molten aluminum remote from the electrolysis.
摘要翻译： 一种用于从氧化铝生产铝的电解池，具有用于收集远离电解的熔融铝的储存器。
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公开(公告)号：US06193944B1
公开(公告)日：2001-02-27
申请号：US09298087
申请日：1999-04-22
IPC分类号： C01B3312
CPC分类号： C01B7/191 , C01B7/193 , C01B33/18 , C01C1/244 , C01F7/141 , C01F7/50 , C01F7/56 , C01F11/24 , C01F11/46 , C03C1/002 , C04B7/24 , C04B18/0481 , C04B33/1324 , C04B35/185 , C04B35/62204 , C22B21/0015 , C22B21/0046 , C22B21/0069 , Y02P10/234 , Y02P40/145 , Y02P40/69 , Y02W30/91
摘要： Spent potliner from an aluminum reduction cell is subject to an acid digest and the digest may be adjusted to produce a first gas component comprised of at least one material selected from the group consisting of silicon tetrafluoride, hydrogen fluoride, hydrogen cyanide gas and water vapor, and a slurry component comprised of at least one material selected from the group consisting of carbon, silica, alumina, and sodium, iron, calcium and magnesium compounds. The first gas component is removed from the digester and heated to a temperature sufficiently high to convert said silicon tetrafluoride to fumed silica and hydrogen fluoride. Thereafter, the fumed silica is separated from the hydrogen fluoride to recover fumed silica from spent potliner material.
摘要翻译： 来自铝还原池的废碱浆料经受酸消化，并且可以调节消化物以产生由选自四氟化硅，氟化氢，氰化氢气体和水蒸气中的至少一种材料组成的第一气体组分， 以及由选自碳，二氧化硅，氧化铝和钠，铁，钙和镁化合物中的至少一种材料组成的浆料组分。 将第一气体组分从蒸煮器中取出并加热至足够高的温度，以将所述四氟化硅转化成热解法二氧化硅和氟化氢。 此后，将热解二氧化硅从氟化氢中分离出来，从废弃的废料中回收煅制二氧化硅。
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5.发明授权公开(公告)号：US06837982B2
公开(公告)日：2005-01-04
申请号：US10055153
申请日：2002-01-25
摘要： A method of maintaining molten salt concentration in a low temperature electrolytic cell used for production of aluminum from alumina dissolved in a molten salt electrolyte contained in a cell free of frozen crust wherein volatile material is vented from the cell and contacted and captured on alumina being added to the cell. The captured volatile material is returned with alumina to cell to maintain the concentration of the molten salt.
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公开(公告)号：US06558525B1
公开(公告)日：2003-05-06
申请号：US10086255
申请日：2002-03-01
IPC分类号： C25C308
摘要： A method of producing aluminum in an electrolytic cell containing alumina dissolved in an electrolyte, the method comprising the steps of providing a molten salt electrolyte at a temperature of less than 900° C. having alumina dissolved therein in an electrolytic cell having a liner for containing the electrolyte, the liner having a bottom and walls extending upwardly from said bottom. A plurality of non-consumable anodes and cathodes are disposed in a vertical direction in the electrolyte, the cathodes having a plate configuration and the anodes having a flat configuration to compliment the cathodes. The anodes contain apertures therethrough to permit flow of electrolyte through the apertures to provide alumina-enriched electrolyte between the anodes and the cathodes. Electrical current is passed through the anodes and through the electrolyte to the cathodes, depositing aluminum at the cathodes and producing gas at the anodes.
摘要翻译： 一种在含有溶解在电解质中的氧化铝的电解槽中生产铝的方法，该方法包括以下步骤：在低于900℃的温度下提供熔融盐电解质，其中溶解有氧化铝的电解槽中具有含有 电解质，衬里具有底部和从所述底部向上延伸的壁。 多个非消耗性阳极和阴极在电解质中沿垂直方向设置，阴极具有板状结构，阳极具有扁平构型以补充阴极。 阳极包含穿过其中的孔，以允许电解液通过孔流动，以在阳极和阴极之间提供氧化铝富集的电解质。 电流通过阳极并通过电解质进入阴极，在阴极处沉积铝并在阳极处产生气体。
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7.发明授权
公开(公告)号：US5723097A
公开(公告)日：1998-03-03
申请号：US569271
申请日：1995-12-08
IPC分类号： C01B7/19 , C01C1/244 , C01F7/14 , C01F7/50 , C01F7/56 , C01F11/24 , C01F11/46 , C03C1/00 , C04B7/24 , C04B35/185 , C04B35/622 , C22B21/00 , C01F7/04 , C01B7/22
CPC分类号： C04B33/1324 , C01B7/191 , C01C1/244 , C01F11/24 , C01F11/46 , C01F7/141 , C01F7/50 , C01F7/56 , C03C1/002 , C04B33/138 , C04B35/185 , C04B35/62204 , C04B7/24 , C22B21/0046 , C22B21/0069 , C04B2235/3217 , C04B2235/445 , C04B2235/448 , Y02P40/145 , Y02P40/69
摘要： A method of treating spent potliner material from aluminum reduction cells is disclosed. The spent potliner material is introduced into a sulfuric acid digester to produce a gas component including hydrogen fluoride and hydrogen cyanide and a slurry component including carbon, silica, alumina, sodium sulfate, iron, calcium and magnesium. The gas component is recovered and heated an effective amount to eliminate hydrogen cyanide and produce a remaining gas component including CO.sub.2, H.sub.2 O, nitrogen oxides and HF. The remaining gas component is directed through a water scrubber to form hydrofluoric acid, and the hydrofluoric acid is admixed with aluminum hydroxide to create aluminum fluoride. The slurry component is rinsed with water to separate a first solid fraction containing carbon, alumina and silica from a second liquid faction. The pH of the liquid fraction is adjusted to first create and separate aluminum hydroxide and then to separate sodium sulfate. Finally, the solid fraction is admixed with an alumina/silica mix and then subjected to an elevated temperature in an oxygen-rich atmosphere to oxidize the carbon and vitrify the alumina and silica into refractory material.
摘要翻译： 公开了一种从铝还原电池处理废钽材料的方法。 将废弃的老化剂材料引入硫酸消化器中以产生包括氟化氢和氰化氢的气体组分和包括碳，二氧化硅，氧化铝，硫酸钠，铁，钙和镁的淤浆组分。 回收气体组分并加热有效量以除去氰化氢并产生包括CO 2，H 2 O，氮氧化物和HF的剩余气体组分。 剩余的气体组分被引导通过水洗涤器以形成氢氟酸，并将氢氟酸与氢氧化铝混合以产生氟化铝。 用水冲洗浆料组分以从第二液体分离含有碳，氧化铝和二氧化硅的第一固体部分。 调节液体部分的pH以首先产生和分离氢氧化铝，然后分离硫酸钠。 最后，将固体部分与氧化铝/二氧化硅混合物混合，然后在富氧气氛中升高温度以氧化碳，并将氧化铝和二氧化硅玻璃化成耐火材料。
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公开(公告)号：US07077945B2
公开(公告)日：2006-07-18
申请号：US10431403
申请日：2003-05-08
摘要： A method of producing aluminum in an electrolytic cell containing alumina dissolved in an electrolyte, the method comprising the steps of providing a molten salt electrolyte at a temperature of less than 900° C. having alumina dissolved therein in an electrolytic cell having a liner for containing the electrolyte, the liner having a bottom and walls extending upwardly from said bottom. A plurality of non-consumable Cu—Ni—Fe anodes and cathodes are disposed in a vertical direction in the electrolyte, the cathodes having a plate configuration and the anodes having a flat configuration to compliment the cathodes. The anodes contain apertures therethrough to permit flow of electrolyte through the apertures to provide alumina-enriched electrolyte between the anodes and the cathodes. Electrical current is passed through the anodes and through the electrolyte to the cathodes, depositing aluminum at the cathodes and producing gas at the anodes.
摘要翻译： 一种在含有溶解在电解质中的氧化铝的电解槽中生产铝的方法，该方法包括以下步骤：在低于900℃的温度下提供熔融盐电解质，其中溶解有氧化铝的电解槽中具有含有 电解质，衬里具有底部和从所述底部向上延伸的壁。 多个非消耗性Cu-Ni-Fe阳极和阴极在电解质中沿垂直方向设置，阴极具有板状结构，阳极具有平坦的构造以补充阴极。 阳极包含穿过其中的孔，以允许电解液通过孔流动，以在阳极和阴极之间提供氧化铝富集的电解质。 电流通过阳极并通过电解质进入阴极，在阴极处沉积铝并在阳极处产生气体。
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公开(公告)号：US06866768B2
公开(公告)日：2005-03-15
申请号：US10387602
申请日：2003-03-14
摘要： Electrolysis of alumina dissolved in a molten salt electrolyte employing inert anode and cathodes, the anode having a box shape with slots for the cathodes.
摘要翻译： 使用惰性阳极和阴极电解溶解在熔融盐电解质中的氧化铝，该阳极具有阴极槽。
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公开(公告)号：US06800191B2
公开(公告)日：2004-10-05
申请号：US10098141
申请日：2002-03-15
IPC分类号： C25C308
摘要： A method of producing aluminum in an electrolytic cell containing alumina dissolved in an electrolyte, the method comprising providing a molten salt electrolyte having alumina dissolved therein in an electrolytic cell. A plurality of anodes and cathodes having planar surfaces are disposed in a generally vertical orientation in the electrolyte, the anodes and cathodes arranged in alternating or interleaving relationship to provide anode planar surfaces disposed opposite cathode planar surfaces, the anode comprised of carbon. Electric current is passed through anodes and through the electrolyte to the cathodes depositing aluminum at the cathodes and forming carbon containing gas at the anodes.
摘要翻译： 一种在含有溶解在电解质中的氧化铝的电解槽中制造铝的方法，该方法包括在电解池中提供溶解有氧化铝的熔融盐电解液。 具有平面表面的多个阳极和阴极以电解液中的大致竖直方向设置，阳极和阴极以交替或交错关系布置，以提供与阴极平面相对设置的阳极平面，阳极由碳组成。 电流通过阳极并通过电解质到在阴极处沉积铝并在阳极处形成含碳气体的阴极。
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