公开(公告)号：US20090246104A1

公开(公告)日：2009-10-01

申请号：US11629894

申请日：2005-06-17

申请人： Linda Jane McCausland ,  Martin Fennell

发明人： Linda Jane McCausland ,  Martin Fennell

IPC分类号： C01F7/14 ,  B01D43/00

CPC分类号： C01F7/144 ,  C01F7/147

摘要： A Bayer liquor is produced by dissolving bauxite in hot caustic soda. The liquor is cooled so that it is supersaturated, and seed crystals of gibbsite are added to the liquor (16). At the same time at least part of the liquor is subjected to intense ultrasonic irradiation (34) such as to cause cavitation, preferably by passing liquor and seed crystals (28) through a recirculation duct (30). The ultrasound increases the proportion of fines by breaking up any crystal agglomerates and also by generating crystal nuclei, and also removes fouling from crystal surfaces. The precipitation process is consequently more effective. If ultrasound is applied when measurements indicate that there are insufficient fines in the liquor, this improves the consistency of the precipitation process.

摘要翻译： 拜耳酒是通过将铝土矿溶解在热的苛性钠中生产的。 将液体冷却使其过饱和，并将三水铝矿的晶体加入到液体（16）中。 同时，至少部分液体经受强烈的超声波照射（34），例如引起空化，优选通过使液体和晶种（28）通过再循环管道（30）。 超声波通过分解任何晶体附聚物以及通过产生晶核而增加细粒的比例，并且还从晶体表面去除污垢。 降水过程因此更有效。 如果在测量结果表明液体中没有足够的细粉时应用超声波，则可提高沉淀过程的一致性。

公开(公告)号：US20070217977A1

公开(公告)日：2007-09-20

申请号：US11748398

申请日：2007-05-14

申请人： Hisakatsu Kato ,  Masashi Wada ,  Naoyuki Eguchi ,  Hirofumi Sasaki

发明人： Hisakatsu Kato ,  Masashi Wada ,  Naoyuki Eguchi ,  Hirofumi Sasaki

IPC分类号： C01F7/06

CPC分类号： B01F7/00208 ,  B01F7/00641 ,  B01F7/1675 ,  B01F7/22 ,  B01F15/00837 ,  B01F2215/0431 ,  B01F2215/044 ,  B01F2215/0472 ,  B01F2215/0477 ,  B01J19/006 ,  B01J19/0066 ,  B01J19/1812 ,  B01J2219/00768 ,  C01F7/02 ,  C01F7/14 ,  C01F7/144 ,  C01F7/147 ,  C01P2004/50 ,  C01P2004/61 ,  C01P2006/60 ,  C09C1/407 ,  Y10T428/2982

摘要： Aluminum hydroxide aggregated particles which have an average particle diameter of not less than 40 μm, an average particle diameter as determined after pressing at 1,000 kg/cm2 of not more than 35 μm, and an L value of slurry obtained by mixing 20 ml of glycerol and 10 g of the aluminum hydroxide aggregated particles of not more than 69, are obtained by a process comprising the steps of: (a) feeding a supersaturated aqueous sodium aluminate solution to a vessel, (b) adding aluminum hydroxide seed to the supersaturated aqueous sodium aluminate solution, (c) stirring the seed-added solution n the vessel while continuously feeding an additional supersaturated aqueous sodium aluminate solution into the vessel to hydrolyze the supersaturated aqueous sodium aluminate solution, (d) separating the aluminum hydroxide aggregated particles from the aqueous sodium aluminate solution, and (e) continuously discharging the aqueous sodium aluminate solution out of the vessel.

摘要翻译： 平均粒径为40μm以上的氢氧化铝凝集粒子，1000kg / cm 2以上压制后的平均粒径为35μm以下，L值为 通过包括以下步骤的方法获得通过混合20ml甘油和10g不大于69的氢氧化铝凝集颗粒获得的浆料：（a）将过饱和的铝酸钠水溶液进料到容器中，（b） 将氢氧化铝种子加入到过饱和的铝酸钠水溶液中，（c）在容器中搅拌加入种子的溶液，同时连续地向容器中加入过饱和的铝酸钠水溶液以水解过饱和的铝酸钠水溶液，（d）分离 来自铝酸钠水溶液的氢氧化铝凝集颗粒，和（e）将铝酸钠水溶液连续排出容器。

公开(公告)号：US5985165A

公开(公告)日：1999-11-16

申请号：US742153

申请日：1996-10-31

申请人： Hiroshi Fukuta ,  Tsutomu Kakei ,  Tadabumi Tomita ,  Hideki Miwa

发明人： Hiroshi Fukuta ,  Tsutomu Kakei ,  Tadabumi Tomita ,  Hideki Miwa

IPC分类号： B41N3/03 ,  C01F7/14 ,  C01F7/46 ,  C23F1/36 ,  C23F1/46 ,  B44C1/22 ,  C01F7/34

CPC分类号： C23F1/46 ,  B41N3/03 ,  C01F7/144 ,  C01P2006/80

摘要： The present invention allows the reproduction of a crystalline aluminum hydroxide having a high particle strength and a high purity which can find wide application such as abrasive from a supersaturated sodium aluminate solution which is being recycled in the production of aluminum hydroxide or lithographic printing plate. In a process for the purification of aluminum hydroxide which comprises the hydrolysis reaction of a supersaturated solution of sodium aluminate to crystallize aluminum hydroxide, the improvement which comprises the steps of keeping the temperature of a suspension formed by mixing a mother liquor having a total caustic soda concentration of from 50 to 700 g/l and an aluminum concentration or from 0 to 300 g/l with crystalline aluminum hydroxide at a range of from 10.degree. C. to 200.degree. C. for at least 1 to 48 hours, mixing the suspension with the supersaturated solution of sodium aluminate, and then causing the crystallization reaction at the crystallization reaction temperature.

摘要翻译： 本发明允许再生具有高颗粒强度和高纯度的结晶氢氧化铝，其可以从在氢氧化铝或平版印刷版的生产中再循环的过饱和铝酸钠溶液得到广泛的应用，例如磨料。 在包括铝酸钠的过饱和溶液的水解反应以氢氧化铝结晶的氢氧化铝的纯化方法中，包括如下步骤：将通过混合具有总苛性钠的母液混合形成的悬浮液的温度 浓度为50至700g / l，铝浓度为0至300g / l，结晶氢氧化铝的浓度为10至200℃至少1至48小时，将悬浮液 用过饱和的铝酸钠溶液，然后在结晶反应温度下引起结晶反应。

公开(公告)号：US5976325A

公开(公告)日：1999-11-02

申请号：US989569

申请日：1997-12-12

申请人： Keith A. Blanks

发明人： Keith A. Blanks

IPC分类号： C01F7/14 ,  C01F7/00

CPC分类号： C01F7/144 ,  C01P2004/03 ,  C01P2004/61

摘要： A novel laser-induced precipitation process is disclosed for forming purified alumina hydrate from a sodium aluminate solution by illuminating with light wave energy produced by the near infrared wavelength, linearly polarized output of a laser. In one aspect, supersaturated sodium aluminate solution is treated by illuminating with light wave energy to produce a photo-induced nucleation of purified gibbsite aluminum trihydroxide crystals. Near infrared pulses of light wave energy, spatially and temporally overlapped inside the supersaturated sodium alumina, form a precipitated purified alumina hydrate without the need for external seed to be added.

摘要翻译： 公开了一种新颖的激光诱导沉淀方法，用于通过用近红外波长，激光线偏振输出产生的光波照射来从铝酸钠溶液中形成纯净的氧化铝水合物。 在一个方面，通过用光波能量照射来处理过饱和铝酸钠溶液，以产生纯化的三水铝体三水合铝晶体的光致成核。 在太过饱和的氧化铝的空间和时间上重叠的光波能的近红外脉冲形成沉淀的纯化的氧化铝水合物，而不需要加入外部种子。

公开(公告)号：US5500480A

公开(公告)日：1996-03-19

申请号：US494784

申请日：1995-06-26

申请人： Neil Brown ,  Detlef V. Peij

发明人： Neil Brown ,  Detlef V. 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：US5163973A

公开(公告)日：1992-11-17

申请号：US798210

申请日：1991-11-26

申请人： Charles D. Ellis

发明人： Charles D. Ellis

IPC分类号： C01F7/14

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

摘要： In a process for precipitating alumina hydrate from a stream of Bayer process liquor, wherein the stream is first divided into a major portion and a minor portion, the minor portion fed to an agglomeration stage and seeded with fine seed to induce precipitation and formation of a slurry, and the major portion cooled and charged with coarse seed and directed to a growth stage to induce formation of alumina hydrate product, the steps of: separating solids from the minor portion after formation of the slurry; cooling, to a temperature of between about 45.degree. C. and about 60.degree. C., the liquid remaining after separating solids from the slurry formed in the agglomeration stage; adding an amount of coarse seed to the remaining liquid to generate a slurry of fresh hydrate nuclei; and recombining the slurry of fresh hydrate nuclei with the major portion of the stream.

摘要翻译： 在从Bayer工艺液流中沉淀氧化铝水合物的过程中，其中该物流首先被分成主要部分和少量部分，次要部分进料到附聚阶段，并用精细种子接种以诱导沉淀和形成 浆料，主要部分冷却并加入粗种子并引导至生长阶段以诱导形成水合氧化铝产物，步骤：在形成浆料后从少量部分分离固体; 冷却至约45℃至约60℃的温度，在从聚集阶段中形成的浆料中分离固体后剩余的液体; 向剩余的液体中加入一定量的粗种子以产生新鲜水合物核的浆料; 并将新鲜水合物核的浆料与料流的主要部分重新组合。

公开(公告)号：US5158577A

公开(公告)日：1992-10-27

申请号：US665340

申请日：1991-03-06

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

发明人： Bruan 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% by volume 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。 该方法包括将进入的怀孕液流分成总进入的怀孕液流的约10至约25体积％的小部分，并将该流引入一系列小容器中，其中少量流被允许聚集。 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：US5122348A

公开(公告)日：1992-06-16

申请号：US639005

申请日：1991-01-09

申请人： Winston V. St. Elmo Spence ,  Peter B. Lukong

发明人： Winston V. St. Elmo Spence ,  Peter B. Lukong

IPC分类号： C01F7/02 ,  C01F7/14

CPC分类号： C01F7/144 ,  C01F7/02

摘要： A method is described for mixing a difficult to wet, finely divided powder, e.g. alumina dust, with an aqueous liquid, e.g. Bayer process spent liquor. In the method, the liquor is introduced into a cylindrical mixing zone having a conical bottom zone, the liquor being continuously introduced into the mixing zone as a high velocity stream tangentially immediately above the conical zone to thereby form a rapidly moving vortex within the mixing zone. The dust is caused to fall into the center of the vortex whereby the dust is rapidly engulfed by the liquor with little or no dusting. The thus formed slurry is continuously removed from the bottom of the conical zone and may be processed through a classification circuit, to be separated as fine seed and returned to the precipitation circuit where the fine particles are agglomerated and grown to larger particles of alumina by contact with Bayer process pregnant liquor.

摘要翻译： 描述了用于混合难以湿润的细碎粉末的方法，例如， 氧化铝粉末，与水性液体，例如 拜耳过程用酒。 在该方法中，将液体引入具有锥形底部区域的圆柱形混合区域中，将液体作为高速流连续地引入到混合区域中，直接在锥形区域的正上方，从而在混合区域内形成快速移动的涡流 。 灰尘落入涡流的中心，灰尘被很少或没有粉尘的液体迅速吞没。 如此形成的浆料从圆锥形区域的底部连续地移除，并且可以通过分级回路进行加工，以分离为细晶种并返回沉淀回路，在此沉淀循环中细颗粒凝聚并通过接触生长成较大的氧化铝颗粒 与拜耳过程怀孕的酒。

公开(公告)号：US4582697A

公开(公告)日：1986-04-15

申请号：US624669

申请日：1984-06-13

申请人： Benoit Cristol ,  Jacques Mordini

发明人： Benoit Cristol ,  Jacques Mordini

IPC分类号： A61K8/26 ,  A61Q11/00 ,  B01D9/02 ,  B01J13/02 ,  B01J19/10 ,  C01F7/02 ,  C01F7/14 ,  C01F7/34 ,  C08K3/22 ,  C09K21/02

CPC分类号： C01F7/144 ,  A61K8/26 ,  A61Q11/00 ,  C01P2004/61 ,  C01P2006/12

摘要： A process for the production of aluminum trihydroxide having controlled median diameter of 2 to 100 microns, with a unimodal distribution and minimum deviation, by decomposing a hot supersaturated sodium aluminate solution in the presence of seed aluminum trihydroxide, separating the resultant solid and liquid phases and recovering the solid phase constituted by precipitated aluminum trihydroxide. The process comprises grinding aluminum trihydroxide until the aluminum trihydroxide has a specific BET surface area of at least 1 m.sup.2 /g, introducing the ground aluminum trihydroxide into a hot fraction of the supersaturated sodium aluminate solution to precipitate trihydroxide seed and then decomposing the remaining fraction of the supersaturated sodium alimuniate solution in the presence of the seed. This decomposition leads to the precipitation of aluminum trihydroxide having the required median diameter.

摘要翻译： PCT No.PCT / FR83 / 00209 Sec。 371日期1984年6月13日 102（e）日期1984年6月13日PCT提交1983年10月18日PCT公布。 公开号WO84 / 01568 日本1984年4月26日。一种通过在种子三氢氧化铝存在下分解热过饱和铝酸钠溶液来生产中值粒径为2至100微米的单峰分布和最小偏差的三氢氧化铝的方法， 所得固相和液相，并回收由沉淀的三氢氧化铝构成的固相。 该方法包括研磨三氢氧化铝直到三氢氧化铝具有至少1m 2 / g的比BET表面积，将研磨的三氢氧化铝引入过饱和铝酸钠溶液的热级分中以沉淀三氢氧化钠种子，然后分解剩余部分 在种子存在下，过饱和的阿利膦酸钠溶液。 这种分解导致具有所需中值直径的三氢氧化铝的沉淀。

公开(公告)号：US4511542A

公开(公告)日：1985-04-16

申请号：US613701

申请日：1984-05-24

申请人： Joseph L. Anjier ,  Morris L. Roberson ,  William E. Atchison

发明人： Joseph L. Anjier ,  Morris L. Roberson ,  William E. Atchison

IPC分类号： C01F7/47 ,  C01F7/14

CPC分类号： C01F7/144 ,  C01P2004/61

摘要： An improved precipitation system is provided for the Bayer process production of alumina hydrate. In order to produce coarse and strong alumina hydrate at high yield, supersaturated Bayer process sodium aluminate liquor is seeded with a relatively small seed charge in a first precipitator at a relatively low temperature and the produced slurry is transferred to a second precipitator where without additional seeding, the solids content of the slurry is allowed to increase to about 250-700 g/l by accumulating solids in the line until the desired solids content is reached. After a suitable residence time, a coarse, strong product hydrate can be recovered in yields of or exceeding 80 g/l based on the alumina (Al.sub.2 O.sub.3) content of the supersaturated sodium aluminate liquor subjected to precipitation. The process not only produces the desired product at high yield but also, due to the use of a single, small seed charge, the precipitation system requires fewer precipitators and classifiers for a given residence time. Additionally, it allows significant energy savings by eliminating the need for cooling during the precipitation cycle due to the lower than conventional temperatures which can be utilized in the first precipitator.

摘要翻译： 提供了一种改进的沉淀系统，用于拜耳工艺生产水合氧化铝。 为了以高产率生产粗和强的氧化铝水合物，过饱和的拜耳法铝酸钠液体在相对较低的温度下在第一除尘器中以相对小的种子电荷接种，并且将所产生的浆料转移到第二除尘器，其中没有另外的接种 ，通过在管线中积聚固体使浆料的固体含量增加到约250-700g / l，直到达到所需的固体含量。 在合适的停留时间后，基于经过沉淀的过饱和铝酸钠溶液的氧化铝（Al 2 O 3）含量，可以以80g / l的产率回收粗大的强产品水合物。 该方法不仅以高产率产生所需产物，而且由于使用单一的小种子电荷，沉淀系统在给定的停留时间内需要更少的除尘器和分级器。 另外，由于低于可在第一除尘器中使用的常规温度，因此通过消除在降水循环期间的冷却需要，可以显着节省能源。