公开(公告)号：US06217622B1

公开(公告)日：2001-04-17

申请号：US09178022

申请日：1998-10-22

申请人： Bryan Hiscox

发明人： Bryan Hiscox

IPC分类号： B01D900

CPC分类号： C01F7/144

摘要： A method of forming and classifying a precipitate containing large, coarse and fine particles from a super-saturated precipitating mother slurry, e.g. sodium aluminate from the Bayer process. The method comprises separating the precipitating mother slurry into a plurality of separate streams, introducing each stream into a vessel provided with an agitated lower zone and a quiescent upper zone to form the precipitate, with the large and coarse particles remaining as a slurry in the agitated lower zone and the fine particles migrating to the quiescent zone, removing product slurry from the lower agitated zone, and removing spent liquor containing the fine particles from the quiescent upper zone. The invention also provides apparatus for carrying out the method. The combined precipitation and partial classification (separation of fine particles) makes it possible to deal with high solids charges increasingly encountered in industrial processes.

摘要翻译： 一种从超饱和沉淀母液中形成和分级含有大，粗和细颗粒的沉淀物的方法， 来自拜耳法的铝酸钠。 该方法包括将沉淀的母液分离成多个分开的流，将每个流引入设有搅拌的下部区域和静止的上部区域的容器中以形成沉淀物，其中大颗粒和粗颗粒作为搅拌的浆液中的浆料 下部区域和移动到静止区的细颗粒，从下部搅拌区域除去产物浆料，并从静止上部区域除去含有细颗粒的废液。 本发明还提供了用于执行该方法的装置。 组合沉淀和部分分级（细颗粒分离）使得可以处理工业过程中越来越多遇到的高固体含量。

公开(公告)号：US5837211A

公开(公告)日：1998-11-17

申请号：US852367

申请日：1997-05-07

申请人： Samuel S. Wang ,  Dennis G. Downing ,  Peter V. Avotins

发明人： Samuel S. Wang ,  Dennis G. Downing ,  Peter V. Avotins

IPC分类号： C01F7/06 ,  C01F7/14 ,  B01J19/00 ,  B01D17/00 ,  C01F7/00

CPC分类号： C01F7/144 ,  C01F7/06 ,  C01F7/0646 ,  C01F7/148

摘要： Methods of reducing foam in Bayer process liquor are provided, said methods comprising adding a composition to the Bayer process liquor that comprises a tri(alkoxy alkyl) phosphate and a hydroxyl group containing carrier.

摘要翻译： 提供了在拜耳处理液中减少泡沫的方法，所述方法包括向包含三（烷氧基烷基）磷酸酯和含羟基的载体的拜耳法处理液中加入组合物。

公开(公告)号：US5529761A

公开(公告)日：1996-06-25

申请号：US284470

申请日：1994-10-04

申请人： Gregory P. Brown ,  David G. Wood

发明人： Gregory P. Brown ,  David G. Wood

IPC分类号： C01F7/14 ,  C01F7/02 ,  C22B21/00

CPC分类号： C01F7/144 ,  C01P2004/61

摘要： 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 agglomeration stage, the precipitation slurry is maintained at a temperature of about 75.degree. C. to 85.degree. C. In the growth stage, the agglomeration slurry is cooled by about 1.degree. C. to 3.degree. C. in each growth tank of the multiplicity of growth tanks as compared to an adjacent previous growth tank. The temperature of the precipitation slurry leaving the final precipitator is preferably about 55.degree. C.

摘要翻译： PCT No.PCT / AU93 / 00071 Sec。 371日期：1994年10月4日 102（e）日期1994年10月4日PCT 1993年2月18日提交PCT公布。 公开号WO93 / 16957 1993年9月2日公开了一种通过拜耳法生产氧化铝的方法，包括具有凝聚阶段的沉淀法和析出浆料通过多个生长槽的生长阶段。 在附聚阶段，将沉淀浆液保持在约75℃至85℃的温度。在生长阶段，将聚集浆料在每个生长槽中冷却约1℃至3℃ 与相邻的先前生长罐相比，生长罐的多样性。 离开最终沉淀器的沉淀浆料的温度优选为约55℃

公开(公告)号：US5492542A

公开(公告)日：1996-02-20

申请号：US370813

申请日：1995-01-10

申请人： Neil Brown ,  Detlef Van Peij

发明人： Neil Brown ,  Detlef Van Peij

IPC分类号： C01F7/02 ,  C01F7/14 ,  C01F7/34 ,  C08K3/10 ,  C08K3/22 ,  C08K7/16 ,  C08K7/18 ,  C09K21/02

CPC分类号： C01F7/144 ,  C08K3/22 ,  C01P2004/30 ,  C01P2004/51 ,  C01P2004/61 ,  C01P2006/12 ,  C01P2006/22

摘要： A process for the production of an aluminum hydroxide with rounded grain surfaces. An alkaline solution of a specific composition derived from the Bayer process is inoculated and adsorptively precipitated with an aluminum hydroxide with a specific grain distribution. The aluminum hydroxide obtained according to the new process is especially suitable for the flameproof finishing of polyesters.

摘要翻译： 一种生产具有圆形颗粒表面的氢氧化铝的方法。 将从拜耳法得到的特定组合物的碱性溶液接种并用具有特定颗粒分布的氢氧化铝进行吸附沉淀。 根据新工艺获得的氢氧化铝特别适用于聚酯的防火整理。

公开(公告)号：US5225229A

公开(公告)日：1993-07-06

申请号：US601654

申请日：1990-03-05

申请人： Edward S. Martin ,  Mark L. Weaver ,  John E. Marhanka ,  Alan Pearson ,  Masaki Madono

发明人： Edward S. Martin ,  Mark L. Weaver ,  John E. Marhanka ,  Alan Pearson ,  Masaki Madono

IPC分类号： C01F7/14 ,  C01F7/42 ,  C01F7/44

CPC分类号： C01F7/442 ,  C01F7/144 ,  C01F7/428 ,  C01P2004/03 ,  C01P2004/20 ,  C01P2004/45 ,  C01P2004/50 ,  C01P2004/51 ,  C01P2004/61 ,  C01P2004/62 ,  C01P2006/12 ,  C01P2006/14 ,  C01P2006/16

摘要： A method for the production of aluminum hydroxide, including reacting water in the liquid phase and aluminum at a pH above about 12.4. In this pH range, aluminum hydroxide is produced at acceptable rates both for aluminum surface areas above 75,000 mm.sup.2 /g and for aluminum surface area of less than about 50,000 mm.sup.2 per gram, and even down to 20 mm.sup.2 per gram. According to an alternative view of the invention, it is characterized by the production of aluminum hydroxide by reacting aluminum with liquid water containing choline. Aluminum hydroxide particles having unique morphologies are obtained.

摘要翻译： 一种生产氢氧化铝的方法，包括使液相中的水与高于约12.4的pH的铝反应。 在该pH范围内，对于铝表面积高于75,000mm 2 / g的铝表面积和小于约50,000mm 2 /克的铝表面积，甚至低至20mm 2 /克，生产氢氧化铝的可接受率。 根据本发明的另一种观点，其特征在于通过使铝与含有胆碱的液态水反应生产氢氧化铝。 获得具有独特形态的氢氧化铝颗粒。

公开(公告)号：US5102426A

公开(公告)日：1992-04-07

申请号：US480059

申请日：1990-02-14

申请人： Bryan A. Hiscox ,  Charles D. Ellis ,  Jacques E. Larocque ,  Denis R. Audet

发明人： Bryan A. Hiscox ,  Charles D. Ellis ,  Jacques E. Larocque ,  Denis R. Audet

IPC分类号： C01F7/14

CPC分类号： C01F7/144 ,  C01P2004/61

摘要： An improved process for precipitating alumina from Bayer process liquors is disclosed. The process involves dividing an incoming pregnant liquor stream into a minor portion of about 10 to about 25% of the total incoming pregnant liquor stream, and directing that stream into a series of small tanks where the minor stream is permitted to agglomerate. Fine aluminum hydroxide seed having a median particle size of between about 30 and about 60 microns is added to this stream. The slurry resulting from the agglomeration stage is then directed to a set of larger vessels in which the growth stage will take place. At this point, the remaining portion of the pregnant liquor is combined with the slurry resulting from the agglomeration stage. A coarse seed charge of about 150 to about 600 grams/liter of seed having a median particle size of between about 80 and about 100 microns is charged into the second set of vessels. This improved process helps to increase the yield of a strong coarse aluminum trihydroxide product.

摘要翻译： 公开了一种从拜耳法溶液中沉淀氧化铝的改进方法。 该过程包括将进入的怀孕液流分成进入的怀孕液流总量的约10至约25％的较小部分，并将该流引导到一系列小容器中，其中小流被允许聚集。 将中等粒度为约30至约60微米的氢氧化铝细粒子加入该料流中。 然后将由聚集阶段产生的浆料导向一组较大的容器，其中将发生生长阶段。 此时，将剩余部分的怀孕液与由聚集阶段产生的浆液组合。 将约150至约600克/升中值粒度为约80至约100微米的种子的粗种子装料装入第二组容器中。 这种改进的方法有助于提高强大的三氢氧化铝粗产物的产率。

公开(公告)号：US4762684A

公开(公告)日：1988-08-09

申请号：US3046

申请日：1987-01-13

申请人： Eric Chantriaux ,  Henri Grobelny ,  Yves Perret

发明人： Eric Chantriaux ,  Henri Grobelny ,  Yves Perret

IPC分类号： C01F7/14 ,  B01F13/02

CPC分类号： C01F7/144 ,  C01F7/147 ,  C01P2004/50 ,  C01P2004/61

摘要： A method and apparatus for decomposing a sodium aluminate liquor supersaturated with alumina, obtained from alkaline action on bauxite by the Bayer process, is initiated by introduction of alumina trihydrate seed, thereby forming a suspension. The suspension is fed in at the top of a non-agitated reactor described as a "decomposer", and removed from the bottom of the decomposer; the speed at which the suspension moves downwardly is regulated at 1.5 to 10 meters per hour. The apparatus comprises a cylindrical-conical reactor which is fitted with an arrangement for feeding in the suspension at the top, and with an arrangement for taking out the suspension at the bottom. In one embodiment of the apparatus the suspension is taken from the base of the decomposer through an internal tube, with air injected into the bottom of it, is raised to the level of the top of the decomposer and is then sent downstream.

摘要翻译： 通过引入三水合氧化铝种子来引发用于通过拜耳法从碱性作用对铝土矿进行分解的用氧化铝过饱和的铝酸钠液体的方法和装置，从而形成悬浮液。 悬浮液在称为“分解器”的非搅拌反应器的顶部进料，并从分解器的底部除去; 悬架向下移动的速度调节为每小时1.5至10米。 该装置包括圆柱形锥形反应器，该反应器装配有用于供给悬挂在顶部的装置，并具有用于在底部取出悬架的装置。 在装置的一个实施例中，悬浮液通过内管从分解器的底部取出，其中注入空气的底部的空气被升高到分解器的顶部的水平面，然后被送到下游。

公开(公告)号：US4581207A

公开(公告)日：1986-04-08

申请号：US637743

申请日：1984-08-06

申请人： J. Finley Bush ,  Paul J. The

发明人： J. Finley Bush ,  Paul J. The

IPC分类号： C01F7/06 ,  C01F7/14 ,  C01F7/47 ,  C01D1/34

CPC分类号： C01F7/47 ,  C01F7/0606 ,  C01F7/144 ,  C01F7/473

摘要： A process for the purification of spent liquor from an alumina precipitation stage is disclosed wherein the spent liquor is first contacted with 50 volume % or less ethanol to form a sodium oxalate precipitate and the, after removal of the sodium oxalate precipitate is contacted with over 50 volume % of ethanol extraction fluid to separate the mixture into a first layer comprising the ethanol and at least a portion of the caustic from the spent liquor and a second layer which comprises the remainder of the spent liquor. The spent liquor may then be subjected to a further precipitation to recover further alumina. The spent liquor remaining may be further treated in subsequent extraction steps to concentrate and dispose of undesirable impurities remaining.

摘要翻译： 公开了一种用于从氧化铝沉淀阶段纯化废液的方法，其中废液首先与50体积％或更少的乙醇接触以形成草酸钠沉淀物，并且在除去草酸钠沉淀物后，与超过50 体积％的乙醇提取流体，以将混合物分离成包含乙醇的第一层和来自废液的至少一部分苛性碱，以及包含剩余的废液的第二层。 然后可以将废液进一步沉淀以再回收氧化铝。 剩余的废液可以在随后的萃取步骤中进一步处理以浓缩和处理剩余的不需要的杂质。

公开(公告)号：US4311486A

公开(公告)日：1982-01-19

申请号：US175535

申请日：1980-08-05

申请人： Koichi Yamada ,  Takuo Harato ,  Hisakatsu Kato ,  Yasumi Shiozaki

发明人： Koichi Yamada ,  Takuo Harato ,  Hisakatsu Kato ,  Yasumi Shiozaki

IPC分类号： C01F7/14 ,  B01D9/02

CPC分类号： C01F7/144 ,  C01P2004/61

摘要： Coarse grains of aluminum hydroxide are economically produced in a high yield from sodium aluminate solution by dividing supersaturated sodium aluminate solution being prepared by the Bayer process and having a molar ratio of Na.sub.2 O as caustic soda to Al.sub.2 O.sub.3 in solution of less than 1.8 into two streams, adding a portion of recycle seed aluminum hydroxide and fine grains of aluminum hydroxide as seed to one of the streams of sodium aluminate solution, partially decomposing the sodium aluminate solution until the molar ratio of the sodium solution reaches 1.8-2.6, adding to the resulting partially decomposed sodium aluminate slurry the other stream of sodium aluminate solution, which has been cooled to a temperature low enough to lower the temperature of the partially decomposed sodium aluminate slurry by at least 3.degree. C., and the remaining portion of recycle seed aluminum hydroxide, and then further decomposing the cooled and mixed sodium aluminate slurry until the molar ratio of the sodium aluminate slurry reaches 2.6-4.0. The resulting coarse grains of aluminum hydroxide have a high resistance to disintegration to fine powder when calcined.

摘要翻译： 通过将通过拜耳法制备的过饱和铝酸钠溶液除以铝酸钠溶液的高收率经济地生产氢氧化铝粗颗粒，并且将Na 2 O作为苛性钠与Al 2 O 3在小于1.8的溶液中的摩尔比分成两股料流， 将一部分再循环种子氢氧化铝和细晶粒的氢氧化铝作为种子加入到铝酸钠溶液之一中，部分分解铝酸钠溶液直到钠溶液的摩尔比达到1.8-2.6，加入部分 分解的铝酸钠将另一个铝酸钠溶液浆液冷却至足够低的温度，将部分分解的铝酸钠浆料的温度降低至少3℃，剩余部分再循环种子氢氧化铝， 然后进一步分解冷却和混合的铝酸钠浆料，直到麦芽的摩尔比 铝酸盐浆料达到2.6-4.0。 得到的氢氧化铝粗颗粒在煅烧时具有高的崩解分解成细粉末的能力。

公开(公告)号：US4305913A

公开(公告)日：1981-12-15

申请号：US175816

申请日：1980-08-06

申请人： Joseph L. Anjier

发明人： Joseph L. Anjier

IPC分类号： C01F7/14 ,  C01F7/06

CPC分类号： C01F7/144 ,  C01P2004/50

摘要： A precipitation system is provided for the production of strong, coarse alumina hydrate (Al.sub.2 O.sub.3.3H.sub.2 O) from Bayer process aluminate liquors. In the system three distinct, but interconnected processing stages are utilized which comprise an agglomeration stage, a growth stage and a seed generation stage. In the agglomeration stage hydrate particles agglomerate to form coarse particles; in the growth stage these particles grow and acquire strength; while in the seed generation stage alumina hydrate seed is generated to be used in the agglomeration and growth stages.The precipitation system combines the advantages of both the American and European Bayer processes in that it results in the production of a strong, coarse product hydrate and an increased yield.

摘要翻译： 提供沉淀系统用于生产来自拜耳法铝酸盐液体的强的粗水合氧化铝（Al2O3.3H2O）。 在该系统中，利用三个不同但相互连接的处理阶段，其包括聚集阶段，生长阶段和种子生成阶段。 在附聚阶段，水合物颗粒聚集形成粗颗粒; 在生长阶段，这些颗粒生长并获得强度; 而在种子生成阶段，生成氧化铝水合物种子用于聚集和生长阶段。 降水系统结合了美国和欧洲拜耳方法的优势，因此可以生产出一种强大的粗水合产品，并提高产量。