公开(公告)号：US4093700A

公开(公告)日：1978-06-06

申请号：US801054

申请日：1977-05-27

申请人： Kent W. Loest ,  George H. Kesler

发明人： Kent W. Loest ,  George H. Kesler

IPC分类号： C01D5/00 ,  C01F7/06

CPC分类号： C01D5/008 ,  C01F7/0686

摘要： The invention is an improvement in the method for recovering aluminum values from alunite ore by roasting the ore to remove water, reducing the ore by roasting it in a reducing atmosphere to remove sulfate, optionally roasting the reduced ore in an oxidizing atmosphere to convert any sulfides formed in the second roast to oxides, leaching the calcined ore with water as a solvent to remove compounds of sulfur and alkali metals, recovering aluminum values as soluble aluminates from the residue from the leaching step by digesting it with at least one alkali metal hydroxide, removing contaminate silica from the resulting leach solution, and precipitating aluminum hydroxide from the solution, the improvement being the use of a two stage reduction of the dehydrated alunite ore, in which the ore is reduced by sulfur in the first stage, followed by a second stage reduction with another reducing agent such as hydrogen.

摘要翻译： 本发明是通过焙烧矿石以除去水来从铝酸盐矿矿中回收铝值的方法的改进，通过在还原气氛中焙烧以除去硫酸盐来还原矿石，任选地在氧化气氛中焙烧还原矿石以转化任何硫化物 在第二次焙烧中形成氧化物，用煅烧矿石作为溶剂浸出煅烧矿石以除去硫和碱金属的化合物，通过用至少一种碱金属氢氧化物消化从浸出步骤的残余物中回收作为可溶性铝酸盐的铝值， 从所得浸出溶液中除去污染二氧化硅，并从溶液中沉淀出氢氧化铝，改进之处在于使用二级还原脱水的铝橄榄石矿石，其中矿石在第一阶段被硫还原，然后是第二级 用另一种还原剂如氢还原。

公开(公告)号：US4031182A

公开(公告)日：1977-06-21

申请号：US669621

申请日：1976-03-24

申请人： Kent W. Loest

发明人： Kent W. Loest

IPC分类号： C01D5/00 ,  C01F7/06 ,  C01F7/26 ,  C01F7/14

CPC分类号： C01D5/008 ,  C01F7/0686 ,  C01F7/26

摘要： A process for recovering aluminum from alunite ore directed to providing a residue for the Bayer leach step substantially free of impurities so that a high A/C ratio Bayer leach liquor is produced, which comprises roasting the ore in particulate form to drive off water and sulfur as SO.sub.2 and to convert aluminum sulfate to alumina, leaching the residue containing aluminum values with water and filtering to remove potassium sulfate and other soluble sulfates, hot leaching the residue with sulfuric acid to convert the alumina therein to soluble aluminum sulfate followed by filtering to remove silicon dioxide and other solid impurities, crystallizing the aluminum sulfate to further remove impurities, heating the residue to convert the aluminum sulfate to alumina and drive off any remaining sulfur as SO.sub.2, and digesting the alumina calcine with sodium hydroxide under standard Bayer conditions at a high A/C ratio to provide a high A/C ratio solution from which a "sandy" aluminum hydroxide is precipitated.

摘要翻译： 从Alunite矿石中回收铝的方法是为了提供基本上不含杂质的拜耳浸出步骤的残渣，从而产生高A / C比的拜耳浸出液，其中包括以颗粒形式焙烧矿石以除去水和硫 作为SO 2，并将硫酸铝转化为氧化铝，用水浸出含有铝值的残余物，过滤除去硫酸钾和其他可溶性硫酸盐，用硫酸热浸出残余物，将其中的氧化铝转化为可溶性硫酸铝，然后过滤除去 二氧化硅和其他固体杂质，结晶硫酸铝以进一步除去杂质，加热残余物以将硫酸铝转化为氧化铝，并将任何剩余的硫作为SO 2排出，并在标准拜耳条件下以高浓度的氢氧化钠消化氧化铝煅烧物 A / C比，以提供“沙质”氢氧化铝为p的高A / C比溶液 准备了

公开(公告)号：US4029737A

公开(公告)日：1977-06-14

申请号：US675383

申请日：1976-04-09

申请人： Douglas Stevens ,  Helge O. Forberg ,  Larry D. Jennings ,  David L. Thompson ,  Julian V. Copenhaver

发明人： Douglas Stevens ,  Helge O. Forberg ,  Larry D. Jennings ,  David L. Thompson ,  Julian V. Copenhaver

IPC分类号： C01F7/06 ,  C01F7/14

CPC分类号： C01F7/0686

摘要： This invention relates to a method for recovering aluminum hydroxide from alunite ore by roasting the ore to remove water of hydration, roasting it again in a reducing atmosphere to remove sulfate, roasting a third time in an oxidizing atmosphere to convert any sulfides formed in the second roast, leaching with a weak base, leaching with water to remove potassium and sulfate, extracting the aluminum content with a mixture of sodium hydroxide and potassium hydroxide, removing contaminant silica from the leach solution, and precipitating aluminum hydroxide by cooling and seeding the solution.

摘要翻译： 本发明涉及通过焙烧矿石以除去水合水，在还原气氛中再次焙烧以除去硫酸盐，在氧化气氛中第三次焙烧以将第二次形成的任何硫化物转化为从二次矿石中回收氢氧化铝的方法 焙烤，浸入弱碱，用水浸出以除去钾和硫酸盐，用氢氧化钠和氢氧化钾的混合物萃取铝含量，从浸出溶液中除去污染二氧化硅，并通过冷却和接种溶液沉淀氢氧化铝。

公开(公告)号：US2120840A

公开(公告)日：1938-06-14

申请号：US74071034

申请日：1934-08-20

申请人： BOHN ALUMINIUM & BRASS CORP

发明人： MCCULLOUGH WILLIAM E

IPC分类号： C01F7/06

CPC分类号： C01F7/0686

公开(公告)号：US4230678A

公开(公告)日：1980-10-28

申请号：US12181

申请日：1979-02-14

申请人： George J. Hartman ,  Vernon R. Ewing

发明人： George J. Hartman ,  Vernon R. Ewing

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

CPC分类号： C01F7/47 ,  C01F7/0686

摘要： An improvement in processes for recovering aluminum from alunite ore which processes include roasting the ore to remove water of hydration, removing sulfur and potassium compounds from the roasted ore by a procedure including a first leaching step resulting in a residue and a solution containing potassium sulfate, effecting partial recovery of potassium sulfate from the solution by crystallization with some potassium sulfate being bled off from the mother liquor, converting aluminum values in the residue to alkali metal aluminates by digesting the residue with alkali metal hydroxide including a substantial amount of sodium hydroxide, removing silicon from the alkali metal aluminates leaving a waste desilication product, recovering aluminum values from the desilicated aluminates by precipitation, circulating the mother liquor from the precipitation step to digestion as contaminated sodium hydroxide is bled off, the improvement which comprises enhancing the economics of the overall process by introducing therein an ion exchange procedure in which potassium hydroxide for the first leaching step is produced through ion exchange by use of potassium sulfate and sodium hydroxide, a further improvement being the use of the desilication product as the ion exchange agent.

摘要翻译： 从铝酸钙矿石中回收铝的方法的改进包括焙烧矿石以除去水合水，通过包括残留物的第一浸出步骤和含有硫酸钾的溶液的方法从焙烧的矿石中除去硫和钾化合物， 通过用母液中的一些硫酸钾结晶从溶液中部分地回收硫酸钾，通过用包括大量氢氧化钠的碱金属氢氧化物将残留物消化，将残余物中的铝转化成碱金属铝酸盐，除去 来自碱金属铝酸盐的硅离开废弃的脱硅产物，通过沉淀从脱铝的铝酸盐中回收铝的值，将母液从沉淀步骤循环到被污染的氢氧化钠的消解，其改进包括提高整体的经济性 过程 通过在其中引入离子交换方法，其中通过使用硫酸钾和氢氧化钠通过离子交换产生用于第一浸出步骤的氢氧化钾，进一步改进的是使用脱硅产物作为离子交换剂。

公开(公告)号：US4064217A

公开(公告)日：1977-12-20

申请号：US728215

申请日：1976-09-30

申请人： George J. Hartman ,  Michael G. Darland

发明人： George J. Hartman ,  Michael G. Darland

IPC分类号： C01D5/00 ,  C01F7/06

CPC分类号： C01F7/0686 ,  C01D5/008

摘要： An improvement in the process for recovering aluminum from alunite ore disclosed in U.S. Pat. Nos. 3,890,425 and 3,890,426, the improvement being in the recovery of potassium sulfate by crystallization from the leaching solution resulting from potassium hydroxide leaching of the roasted ore, the improvement consisting of adding potassium hydroxide to the concentrated leach liquor prior to crystallization to increase the concentration of the potassium ion so that increased recoveries of potassium sulfate are obtained at a given temperature over those obtained when this procedure is not used. By this procedure a yield is obtained at a temperature below that which is required to obtain the same yield when potassium hydroxide is not used so that the high temperatures formerly necessary to hold enough potassium sulfate in solution for an economic crystallization are avoided. The improvement is particularly adapted to the process of the patents using potassium hydroxide as the leaching agent and in which the mother liquor is recycled to the leach as potassium hydroxide in an amount up to that required for the leaching step can be added in the crystallization step so that the potassium hydroxide serves both as a crystallization aid and as a leachant.

摘要翻译： 美国专利中公开的从铝酸钙矿中回收铝的方法的改进。 编号3,890,425和3,890,426，其改进在于通过从焙烧矿石的氢氧化钾浸出得到的浸出溶液中结晶回收硫酸钾，其改进包括在结晶之前向浓缩浸出液中加入氢氧化钾以提高浓度 的钾离子，使得在给定温度下获得的硫酸钾的回收率提高超过不使用该方法时获得的那些。 通过该方法，在低于当不使用氢氧化钾时获得相同产率所需的温度下获得的产率是可以获得的，因此避免了先前在用于经济结晶的溶液中保持足够的硫酸钾所需的高温。 该改进特别适用于使用氢氧化钾作为浸出剂的专利的方法，并且其中母液再循环至浸出液中，其中氢氧化钾的量可以达到浸出步骤所需的量，可以在结晶步骤中加入 使得氢氧化钾既用作结晶助剂又用作浸出剂。

公开(公告)号：US3984521A

公开(公告)日：1976-10-05

申请号：US565788

申请日：1975-04-07

申请人： Gakif Zakirovich Nasyrov ,  Alexandr Vladimirovich Bogdanov ,  Nikolai Ivanovich Eremin ,  Boris Alexandrovich Stolyar ,  Ivan Terentievich Yamin

发明人： Gakif Zakirovich Nasyrov ,  Alexandr Vladimirovich Bogdanov ,  Nikolai Ivanovich Eremin ,  Boris Alexandrovich Stolyar ,  Ivan Terentievich Yamin

IPC分类号： C01D5/06 ,  C01F7/06

CPC分类号： C01D5/06 ,  C01F7/0686

摘要： A method for processing alunite consisting in that alunite ore is treated with a solution of caustic alkalis at a maximum temperature of 60.degree.C, and a solid residue resulting from the above operation and containing largely potassium and sodium sulphates, is washed with hot water. As a result, potassium and sodium sulphates are dissolved in the wash water, and potassium sulphate is isolated by the action of a caustic-potash solution. The method enables losses of alkalis and aluminium during processing alunite ores containing active forms of silicon compounds to be much reduced, which compound when treating alunite ores with a solution of caustic alkalis, are liable to form insoluble aluminosilicates which are discarded into slime and thus lost together therewith when the latter is separated from the process solution.

摘要翻译： 用碱处理铝锰矿的方法是在最高温度为60℃的苛性碱溶液中处理，上述操作产生的固体残渣主要含有硫酸钠和硫酸钠，用热水洗涤。 结果，硫酸钾和硫酸钠溶解在洗涤水中，硫酸钾通过苛性碱钾溶液的作用被分离。 该方法在处理含有活性形式的硅化合物的铝酸盐矿时，可以减少碱和铝的损失，当用苛性碱溶液处理铝酸盐矿时，该化合物易于形成不溶性硅铝酸盐，将其丢弃成粘泥，从而丢失 当后者与工艺溶液分离时。

公开(公告)号：US3983211A

公开(公告)日：1976-09-28

申请号：US607498

申请日：1975-08-25

申请人： Gakif Zakirovich Nasyrov ,  Nikolai Andreevich Kaluzhsky ,  Vladimir Nikolaevich Kostin

发明人： Gakif Zakirovich Nasyrov ,  Nikolai Andreevich Kaluzhsky ,  Vladimir Nikolaevich Kostin

IPC分类号： C01D5/00 ,  C01F7/06

CPC分类号： C01F7/0686 ,  C01D5/008

摘要： The specific feature of the present method is that in the process solution resulting in the processing of alunite with the object of producing alumina and potassium sulphate therefrom, an excess amount of sodium ions is maintained with respect to the potassium ions.The method is advantageous in that it ensures a higher yield of potassium sulphate and a lower contamination of the final products with respect to sodium and potassium ions.

摘要翻译： 本方法的具体特征在于，在产生氧化铝和硫酸钾的目的的Alunite处理工艺溶液中，相对于钾离子保持过量的钠离子。

公开(公告)号：US1191106A

公开(公告)日：1916-07-11

申请号：US7549216

申请日：1916-02-01

申请人： HERSHMAN PAUL R

发明人： HERSHMAN PAUL R

CPC分类号： C01F7/0686

公开(公告)号：US4618480A

公开(公告)日：1986-10-21

申请号：US641020

申请日：1984-08-15

申请人： Wayne W. Hazen ,  David L. Thompson ,  James E. Reynolds ,  Nicholas J. Lombardo ,  Paul B. Queneau ,  John P. Hager

发明人： Wayne W. Hazen ,  David L. Thompson ,  James E. Reynolds ,  Nicholas J. Lombardo ,  Paul B. Queneau ,  John P. Hager

IPC分类号： C01D5/00 ,  C01F7/06 ,  C01F7/47

CPC分类号： C01F7/0686 ,  C01D5/008 ,  C01F7/47

摘要： A novel process for the recovery of alumina and potassium sulfate from alunite is provided comprising leaching the alunite with potassium hydroxide to which no sodium materials have been added, said leach solution being saturated with potassium sulfate. Aluminum values are solubilized into the leachate, and potassium and sulfur values are rendered soluble, but remain in the residue. The leachate is desilicated if necessary, preferably with lime, and aluminum trihydroxide is precipitated therefrom, followed by calcining to alumina product. The residue is leached to solubilize potassium sulfate in a secondary leach and the potassium sulfate product crystallized therefrom. Potassium hydroxide is regenerated from a portion of the potassium sulfate secondary leachate by several methods.Novel procedures for regenerating alkali metal hydroxides from the corresponding sulfates are also provided including routes involving formates and carbonates as intermediates and pyrohydrolysis.

摘要翻译： 提供了一种从铝酸钠中回收氧化铝和硫酸钾的新方法，包括用不含钠物质的氢氧化钾浸出铝酸钠，所​​述浸出溶液用硫酸钾饱和。 铝的值被溶解到浸出液中，钾和硫的值变得可溶，但残留在残留物中。 必要时，优选用石灰将渗滤液脱气，并从其中沉淀出氢氧化铝，然后煅烧成氧化铝产品。 将残余物浸出以在二次浸出中溶解硫酸钾，并从其中结晶出硫酸钾产物。 通过几种方法从一部分硫酸钾二次浸出液中再生氢氧化钾。 还提供了从相应的硫酸盐再生碱金属氢氧化物的新方法，包括涉及甲酸盐和碳酸盐作为中间体和热解水解的途径。