公开(公告)号：US5624646A

公开(公告)日：1997-04-29

申请号：US382936

申请日：1995-02-02

申请人： Richard B. Phillips ,  Nancy M. Fitzgerald ,  Bennett L. McCormick

发明人： Richard B. Phillips ,  Nancy M. Fitzgerald ,  Bennett L. McCormick

IPC分类号： C01F7/47 ,  C22B3/44 ,  C22B21/00 ,  C01F1/00

CPC分类号： C22B21/0015 ,  C01F7/47 ,  C22B3/44 ,  C01P2006/60 ,  C01P2006/80 ,  Y02P10/234

摘要： There is disclosed a method for improving the brightness level of aluminum hydroxide removed from a caustic solution. The method comprises:(a) pre-filtering the solution to remove contaminants therefrom; and (b) contacting the filtered solution with an adsorbent consisting essentially of a calcined compound having the formula: A.sub.w B.sub.x (OH).sub.y C.sub.z.nH.sub.2 O wherein A represents a divalent metal cation selected from the group consisting of: Mg.sup.2+, Ni.sup.2+, Fe.sup.2+, Ca.sub.2+ and Zn.sup.2+ ; B represents a trivalent metal cation selected from the group consisting of: Al.sup.3+, Fe.sup.3+ and Cu.sup.3+ ; C represents a mono- to tetravalent anion selected from the group consisting of: OH.sup.-, Cl.sup.-, Br.sup.-, NO.sub.3.sup.- CH.sub.3 COO.sup.-, C.sub.2 O.sub.4.sup.2-, CO.sub.3.sup.2-, SO.sub.4.sup.2-, PO.sub.4.sup.3-, Fe(CN).sub.6.sup.3- and Fe(CN).sub.6.sup.4- ; and w, x, y, z and n satisfy the following: 0

公开(公告)号：US4299619A

公开(公告)日：1981-11-10

申请号：US125644

申请日：1980-02-28

申请人： C. Norman Cochran ,  Nancy M. Fitzgerald

发明人： C. Norman Cochran ,  Nancy M. Fitzgerald

IPC分类号： C22B21/02 ,  C22D3/12

CPC分类号： C22B21/02 ,  Y02P20/124

摘要： A method for production of aluminum by carbothermic reduction of Al.sub.2 O.sub.3 in a stack-type reactor. A charge of Al.sub.2 O.sub.3 and C is inserted into an upper reaction zone of the reactor and reacted at an elevated temperature to form CO and a first liquid comprising Al.sub.2 O.sub.3 and Al.sub.4 C.sub.3. The first liquid is transferred to a lower reaction zone beneath the upper reaction zone and heated to form CO and a second liquid of Al and C. A portion of the second liquid is removed, and liquid Al is extracted therefrom. In a preferred method, Al.sub.2 O.sub.3 and C in the upper zone are heated by partial combustion of the C, and the lower zone is heated electrically. Gaseous Al and Al.sub.2 O formed in the lower zone are reclaimed in the upper zone. Gaseous CO produced in both zones heats the Al.sub.2 O.sub.3 and C in the upper zone. Excess CO is removed from the upper zone and used for generation of electricity or chemical process use. Liquid Al.sub.4 C.sub.3 separated from the second liquid is returned to the upper zone. Production of 1.00 kg Al requires an expenditure of 32.7 megajoules (MJ) of electrical energy, and 3.45 kg C. Total consumption of electrical energy and carbon energy equivalent is 121 MJ/kg Al, compared with 186 MJ/kg Al using the best Bayer-Hall technology.

摘要翻译： 在堆叠式反应器中通过Al2O3的碳热还原法生产铝的方法。 将Al 2 O 3和C的电荷插入反应器的上部反应区，并在升高的温度下反应形成CO和包含Al 2 O 3和Al 4 C 3的第一液体。 将第一液体转移到上反应区下方的下反应区，并加热形成CO和Al和C的第二液体。除去一部分第二液体，并从中提取液体Al。 在优选的方法中，上部区域中的Al 2 O 3和C被C的部分燃烧加热，并且下部区域被电加热。 在下部区域形成的气态Al和Al 2 O在上部区域回收。 在两个区域中产生的气态CO加热上部区域中的Al 2 O 3和C。 过多的CO被从上部区域移除并用于发电或化学过程的使用。 与第二液体分离的液体Al4C3返回到上部区域。 生产1.00公斤铝需要32.7兆焦耳（MJ）的电能和3.45千克的电量。电能和碳当量的总消耗量为121兆焦耳/公斤，而使用最佳拜耳的186兆焦耳/公斤的铝 高科技。