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1. 发明授权

US06299846B1 Process for producing aluminum hydroxide from alumina-containing ore 有权
标题翻译：从含氧化铝的矿石生产氢氧化铝的方法
公开(公告)号：US06299846B1
公开(公告)日：2001-10-09
申请号：US09440043
申请日：1999-11-15
申请人： Takuo Harato , Toru Ogawa , Takahiro Ishida
发明人： Takuo Harato , Toru Ogawa , Takahiro Ishida
IPC分类号： C01F700
CPC分类号： C01F7/062
摘要： The present invention provides a process for producing aluminum hydroxide with little contamination by silica at a high yield, while suppressing losses of consumed alumina and alkaline components. The process comprises the steps of mixing a first alumina-containing slurry with a preheated alkaline aqueous solution, extracting alumina from the mixture, separating a dissolution residue from the mixture to obtain a solution, mixing the solution with a second alumina-containing slurry, extracting alumina from the mixture, and precipitating aluminum hydroxide after a desilication treatment.
摘要翻译：本发明提供一种以高产率生产二氧化硅污染少的氢氧化铝的方法，同时抑制消耗的氧化铝和碱性组分的损失。该方法包括以下步骤：将第一含氧化铝的浆料与预热的碱性水溶液混合，从混合物中提取氧化铝，从混合物中分离出溶解残余物，得到溶液，将溶液与第二含氧化铝的浆料混合，氧化铝，脱硅处理后析出氢氧化铝。

2. 发明授权

US5545384A Process for production of aluminum hydroxide from ore containing alumina 失效
标题翻译：从含氧化铝的矿石生产氢氧化铝的方法
公开(公告)号：US5545384A
公开(公告)日：1996-08-13
申请号：US465620
申请日：1995-06-05
申请人： Takuo Harato , Takahiro Ishida , Yoshio Kumagae , Michikazu Inami , Kazuhisa Ishibashi , Mitsuaki Murakami
发明人： Takuo Harato , Takahiro Ishida , Yoshio Kumagae , Michikazu Inami , Kazuhisa Ishibashi , Mitsuaki Murakami
IPC分类号： C01F7/06 , C01F7/47 , C01F7/00 , C01F7/02 , C22B21/00
CPC分类号： C01F7/062 , C01F7/47
摘要： A process for the production of aluminum hydroxide from an alumina-containing ore comprising, in a process for the production of aluminum hydroxide involving extraction of alumina from an alumina-containing ore by an aqueous alkaline solution, supplying a slurry containing the alumina-containing ore at a high solid content which is prepared from a small amount of an alkaline solution together with an aqueous alkaline solution which is so preheated to a temperature that a preheated temperature is enough high to have a temperature after the mixing with the slurry which is higher than an extraction temperature of alumina, simultaneously or after the mixing them, to an extraction apparatus comprising of a tube reactor, extracting alumina from the alumina-containing ore under extraction conditions of a temperature of 120.degree.-160.degree. C. and an extraction time within 10 minutes, separating dissolution residue from an extract solution immediately after the extraction, desilicating the extract solution, and adding seeds of aluminum hydroxide to the extract solution which is desilicated so as to precipitate aluminum hydroxide. By the production process, it is possible to economically produce aluminum hydroxide with little contamination by silica from the alumina-containing ore with a high content of the reactive silica.
摘要翻译：一种用于从含氧化铝的矿石生产氢氧化铝的方法，包括在生产氢氧化铝的方法中涉及通过碱性水溶液从含氧化铝的矿石中提取氧化铝，提供含有含氧化铝的矿石在高固体含量下，由少量的碱性溶液与碱性水溶液一起制备，碱水溶液如此预热至预热温度足够高以使浆料混合后的温度高于将氧化铝的同时或混合后的提取温度提取到包括管式反应器的提取装置中，在120-116℃的提取条件下从含氧化铝的矿石中提取氧化铝，提取时间在 10分钟后，在提取后立即从提取液中分离出溶解残渣，使提取物脱硅溶液，并将氢氧化铝的种子加入到脱液的提取液中以沉淀氢氧化铝。通过生产过程，可以经济地生产具有高含量的反应性二氧化硅的来自含氧化铝的矿石几乎不受二氧化硅污染的氢氧化铝。

3. 发明授权

US4128618A Process for extracting alumina from alumina-containing ores 失效
标题翻译：从含氧化铝矿石中提取氧化铝的方法
公开(公告)号：US4128618A
公开(公告)日：1978-12-05
申请号：US820897
申请日：1977-08-01
申请人： Koichi Yamada , Takuo Harato , Takahiro Ishida , Yasumi Shiozaki
发明人： Koichi Yamada , Takuo Harato , Takahiro Ishida , Yasumi Shiozaki
IPC分类号： C01F7/06
CPC分类号： C01F7/062
摘要： In a process for extracting alumina from alumina-containing ores on a two-stream system by individually preheating a slurry of alumina-containing ores and an aqueous alkali solution each in preheaters of indirectly heating, mixing the preheated slurry with the preheated aqueous alkali solution, and extracting alumina from the ores in a digester of either the heating type involving the direct injection of live steam or the heat-insulated type, the alumina is extracted from the ores by preparing the slurry of alumina-containing ores with water or a diluted aqueous alkali solution, such as from the drain obtained by recovering steam from an evaporator for cooling the slurry resulting from extraction, and utilizing the recovered steam in preheating the slurry of the alumina-containing ores or decomposition solution or both, preheating the slurry of alumina-containing ores, and mixing the preheated slurry with an aqueous alkali solution preheated as another stream as the decomposition solution. Scale formation can be prevented completely or substantially on an inside surface of the preheater for the slurry of alumina-containing ores.
摘要翻译：在通过单独预热间接加热的预热器中的含有氧化铝的矿石和碱性水溶液的浆料的情况下，在双流系统中从含氧化铝的矿石中提取氧化铝的方法中，将预热的浆料与预热的碱水溶液混合，并在包括直接注入活蒸汽或隔热型的加热类型的蒸煮器中从矿石中提取氧化铝，通过用含水或稀释的水溶液制备含氧化铝矿石的浆料，从矿石中提取氧化铝碱性溶液，例如通过从蒸发器回收蒸汽而获得的排水，用于冷却由萃取产生的浆料，并且利用回收的蒸汽预热含氧化铝的矿石或分解溶液或两者的浆料，预热氧化铝 - 并将预热的浆料与作为分解溶质的另一种流体预热的碱性水溶液混合离子。可以完全或基本上防止氧化铝矿石浆料在预热器的内表面上形成鳞屑。

4. 发明授权

US5302368A Process for preparation of alumina 失效
标题翻译：氧化铝的制备方法
公开(公告)号：US5302368A
公开(公告)日：1994-04-12
申请号：US705620
申请日：1991-05-28
申请人： Takuo Harato , Toshiki Furubayashi , Toshio Ashitani , Toru Ogawa
发明人： Takuo Harato , Toshiki Furubayashi , Toshio Ashitani , Toru Ogawa
IPC分类号： C01F7/02 , C01F7/20 , C01F7/22
CPC分类号： C01F7/023 , C01P2004/03 , C01P2004/52 , C01P2004/61 , C01P2006/10 , C01P2006/12 , C01P2006/22 , C01P2006/80
摘要： An aqueous slurry of about 100-1000 centipoises viscosity suspending about 200-2000 g/l of aluminum hydroxide particles smaller than 5 .mu.m is spray-dried, and the dried powders are calcined to obtain alumina powders. The alumina powders have a sharp particle size distribution, being suitable for electronic, abrasive and refractory applications.
摘要翻译：将约100-1000厘泊粘度悬浮于约200-2000g / l小于5（my）m的氢氧化铝颗粒的水浆料喷雾干燥，并将干燥的粉末煅烧以获得氧化铝粉末。氧化铝粉末具有尖锐的粒度分布，适用于电子，磨料和耐火材料应用。

5. 发明授权

US4311486A Process for producing coarse grains of aluminum hydroxide 失效
标题翻译：生产氢氧化铝粗颗粒的方法
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。

6. 发明授权

US4263261A Method for the removal of impurities from sodium aluminate solution 失效
标题翻译：从铝酸钠溶液中除去杂质的方法
公开(公告)号：US4263261A
公开(公告)日：1981-04-21
申请号：US103349
申请日：1979-12-13
申请人： Koichi Yamada , Takuo Harato , Hisakatsu Kato
发明人： Koichi Yamada , Takuo Harato , Hisakatsu Kato
IPC分类号： C01F7/47 , C01F7/06
CPC分类号： C01F7/473 , C01F7/47
摘要： Impurities such as organic substances, i.e. sodium oxalate and inorganic impurities, i.e. sodium salts of vanadium and phosphorus or double salts containing the latter sodium salts are removed from a sodium aluminate solution in the production of alumina from bauxite according to the Bayer process by adding sodium oxalate crystals or both sodium oxalate crystals and at least one of sodium salts of vanadium and phosphorus, or double salts containing the latter sodium salts as seed to the sodium aluminate solution in the course of after the precipitation step of aluminum hydroxide to before the digestion step, thereby precipitating crystals of said impurities, separating the crystals of said impurities from the sodium aluminate solution, dissolving about 10 to 50% by weight of the amount of the newly precipitated organic substances from the separated crystals of said impurities in an aqueous unsaturated sodium oxalate solution, and recyclically using the crystals resulting from the dissolution together with the resulting solution as seed for the precipitation of the impurities in the sodium aluminate solution. The impurities can be simply and effectively removed.
摘要翻译：根据拜耳方法，从铝矾土生产氧化铝中的铝酸钠溶液中除去有机物质，如草酸钠和无机杂质，即含有钒和磷的钠盐，或含有后钠盐的双盐等杂质，草酸盐晶体或草酸二钠晶体和钒和磷的钠盐中的至少一种，或在氢氧化铝在消化步骤之前的沉淀步骤之后，将含有后者钠盐作为种子的双重盐加入到铝酸钠溶液中从而使所述杂质的晶体析出，从铝酸钠溶液中分离出所述杂质的晶体，将来自所述杂质的分离晶体的新沉淀的有机物的量溶解在不饱和草酸钠水溶液中约10〜50重量％溶液，并循环使用由此产生的晶体与所得溶液一起作为用于沉淀铝酸钠溶液中的杂质的种子。可以简单有效地除去杂质。

7. 发明授权

US4222992A Process for the removal of sulfur oxides from exhaust gases using slurry of red mud containing calcium ion 失效
标题翻译：使用含有钙离子的赤泥泥浆从废气中除去硫氧化物的方法
公开(公告)号：US4222992A
公开(公告)日：1980-09-16
申请号：US15756
申请日：1979-02-27
申请人： Koichi Yamada , Takuo Harato , Yasumi Shiozaki
发明人： Koichi Yamada , Takuo Harato , Yasumi Shiozaki
IPC分类号： B01D53/50 , B01D53/77 , C01B17/00
CPC分类号： B01D53/501
摘要： A process for the removal of sulfur oxides from exhaust gases by absorbing with a slurry of red mud containing calcium ion which comprises the steps of:(1) contacting an exhaust gas containing sulfur oxides of not higher than about 100.degree. C. with a slurry of red mud containing calcium ion led from the next step (2) to take up sulfur oxides in the gas until pH of the slurry becomes in the range of 4.3 to less than 6 while maintaining the molar fraction of SO.sub.4.sup.-- to total SO.sub.2 in the slurry within the said pH range at 0.05 to 0.7; and then,(2) contacting the treated gas with a fresh slurry of red mud containing calcium ion to further take up sulfur oxides in the gas while maintaining the concentration of NaHSO.sub.3 in the slurry at not more than about 8 g/l.
摘要翻译：通过用含有钙离子的红泥浆吸收废气中的硫氧化物的方法，该方法包括以下步骤：（1）使含有不高于约100℃的硫氧化物的废气与浆料从下一步骤（2）引出的含有钙离子的红泥，以吸收气体中的硫氧化物，直到浆料的pH在4.3至小于6的范围内，同时将SO 4的摩尔分数保持为总SO 2 所述pH范围内的浆液为0.05〜0.7; 然后，（2）使经处理的气体与含有钙离子的红泥的新浆料接触，以进一步吸收气体中的硫氧化物，同时将浆料中NaHSO 3的浓度保持在不超过约8g / l。

8. 发明授权

US5833865A Sedimentation type solid-liquid separator 失效
标题翻译：沉淀式固液分离器
公开(公告)号：US5833865A
公开(公告)日：1998-11-10
申请号：US819203
申请日：1997-03-17
申请人： Takuo Harato , Yoshio Kumagae , Kazuhisa Ishibashi
发明人： Takuo Harato , Yoshio Kumagae , Kazuhisa Ishibashi
IPC分类号： B01D21/01 , B01D21/24
CPC分类号： B01D21/01 , B01D21/06 , B01D21/183 , B01D21/2405 , B01D21/2427 , B01D21/2455 , B01D21/34
摘要： The slurry subjected to aggregation processing by a line mixer is supplied to a slurry feed member via a slurry supply passage and then fed radially outward from slurry fed outlets within a sedimentation tank. Therefore, liquid flow hardly takes place below the slurry feed member and the settling velocity of the solid is increased. The slurry feed member is arranged close to the boundary face of the thickened slurry zone, and thus the settling distance of the solid is shortened. Accordingly, the residence time of the solid is shortened to a great extent. In addition, the sedimentation tank can be constructed to be sealed and solid-liquid separation can be also performed under the pressurized state.
摘要翻译：通过管线混合器进行聚集处理的浆料经由浆料供给通道供给到浆料供给部件，然后从沉淀池内的浆料供给出口径向向外供给。因此，在浆料供给部件的下方几乎不发生液体流动，并且固体的沉降速度增加。浆料供给部件靠近加厚浆料区域的边界面布置，因此固体的沉降距离缩短。因此，固体的停留时间在很大程度上缩短。此外，沉淀池可以被构造成密封，并且在加压状态下也可以进行固液分离。

9. 发明授权

US4364919A Process for producing coarse grains of aluminum hydroxide 失效
标题翻译：生产氢氧化铝粗颗粒的方法
公开(公告)号：US4364919A
公开(公告)日：1982-12-21
申请号：US347546
申请日：1982-02-10
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： C01F7/04 , C01F7/14
CPC分类号： C01F7/147 , C01F7/144 , C01P2004/61
摘要： Coarse grains of aluminum hydroxide having high resistance to disintegration to powder in a calcination step are continuously produced from a supersaturated sodium aluminate solution of the Bayer process through(1) a first precipitation step of adding recycle seed aluminum hydroxide to a supersaturated sodium aluminate solution 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 supplied to a precipitation tank of substantially complete mixing type in a ratio of 30-150 kg of the recycle seed to 1 m.sup.3 of the solution, thereby partially decomposing the seed-added solution until the molar ratio of the solution reaches 2.0-2.4 while keeping the solution at 65.degree.-80.degree. C.;(2) a second precipitation step of supplying the resulting sodium aluminate solution in a slurry state from the first precipitation step to at most three precipitation tanks of growth type arranged in series and decomposing the solution in the slurry state until the molar ratio reaches at least 2.6 while keeping the solution in the slurry state at a precipitated solid aluminum hydroxide concentration of 400-1,500 g/l and at a slurry temperature of 45.degree.-65.degree. C. in the precipitation tanks of growth type, and(3) a third step of supplying the decomposed solution in a slurry state from the second precipitation step to a classifier, thereby classifying the precipitated aluminum hydroxide grains into coarse grains of aluminum hydroxide as product and fine grains of aluminum hydroxide, and recycling the fine grains of aluminum hydroxide as seed.
摘要翻译：通过（1）将再循环种子氢氧化铝加入到过饱和的铝酸钠溶液中的第一沉淀步骤，由拜耳法的过饱和铝酸钠溶液连续地生产在煅烧步骤中具有高抗崩解粉末性的氢氧化铝的粗颗粒，以低于1.8的溶液中的Na 2 O与Al 2 O 3的摩尔比以小于1.8的比例提供给基本上完全混合的沉淀槽，比例为30-150kg的再循环种子与1m 3的溶液，从而部分分解种子直到溶液的摩尔比达到2.0-2.4，同时保持溶液在65-80℃。（2）第二沉淀步骤，将所得到的铝酸钠溶液从浆液状态从第一沉淀步骤供给到至少三个串联排列的生长型沉淀池，并以浆液状态分解溶液直到摩尔比达到至少 2.6，同时在析出的固态氢氧化铝浓度为400-1,500g / l，浆液温度为45-65℃，在生长型沉淀池中保持浆液状态，（3）第三将分解溶液从第二沉淀步骤供应到分级器的步骤，从而将沉淀的氢氧化铝颗粒分级为氢氧化铝的粗晶粒作为氢氧化铝的产物和细晶粒，并将氢氧化铝的细晶粒再循环种子。

10. 发明授权

US4426363A Process for extracting alumina from aluminous ores 失效
标题翻译：从铝土矿中提取氧化铝的方法
公开(公告)号：US4426363A
公开(公告)日：1984-01-17
申请号：US349666
申请日：1982-02-17
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： C01F7/06 , C01F7/46 , C01F7/47
CPC分类号： C01F7/47 , C01F7/06 , C01F7/062 , C01F7/46
摘要： In the production of alumina from aluminous ores containing alumina trihydrate and alumina monohydrate comprising a first-stage digestion by digesting alumina trihydrate from a slurry of the ores and a caustic solution and separating the resulting slurry into a caustic aluminate solution and an insoluble residue, and a second-stage digestion by digesting alumina monohydrate from a slurry of the insoluble residue separated in the first-stage digestion and a caustic solution, the present invention provides an improvement wherein scale formation onto a preheater for the slurry in the second-stage digestion is completely or substantially prevented and reduction in heat transfer coefficient of heat transfer surface is remarkably lowered. The improvement is attained by setting up a desilication reaction zone in the course of the first-stage digestion, whereby the slurry introduced into said zone is subjected to desilication reaction treatment.
摘要翻译：在含有氧化铝三水合物和氧化铝一水合物的含铝矿石中生产氧化铝，其包括通过从矿石浆料和苛性碱溶液中消化三水合氧化铝进行第一阶段消化，并将所得浆料分离成苛性铝酸盐溶液和不溶性残渣，以及通过在第一阶段消化中分离的不溶性残渣的浆料和苛性碱溶液中消化氧化铝一水合物进行第二阶段消化，本发明提供了一种改进，其中在第二阶段消化中用于浆料的预热器上的结垢为完全或基本上防止了传热表面的传热系数的降低。通过在第一阶段消化过程中设置脱盐反应区来实现改善，由此将引入所述区域的浆料进行脱硅反应处理。

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