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公开(公告)号：US4032613A
公开(公告)日：1977-06-28
申请号：US639024
申请日：1975-12-09
CPC分类号： C01F7/66 , C01G49/0009 , C22B21/0015 , Y02P10/234
摘要： Iron is removed from concentrated aluminum nitrate solution by solvent extraction with tri-n-butyl phosphate.
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公开(公告)号：US4239735A
公开(公告)日：1980-12-16
申请号：US72957
申请日：1979-09-06
IPC分类号： C01F7/22
CPC分类号： C01F7/22
摘要： A method for producing substantially pure alumina from kaolin clay by removing in a soluble form impurities which contaminate the alumina while the aluminum is maintained in an insoluble form. This is accomplished by leaching calcined kaolin clay with at least 36 weight percent hydrochloric acid to dissolve the impurities and convert the aluminum to insoluble aluminum chloride and maintaining the hydrochloric acid concentration in the leach liquor at at least 36 weight percent by the injection of hydrochloric acid gas. The insoluble aluminum chloride is then separated from the dissolved impurities and subjected to a second leaching step to solubilize and separate it from the silica gangue. Substantially pure AlCl.sub.3.sup.. 6H.sub.2 O crystals are recovered from solution and converted to alumina by conventional means. In an alternate embodiment, the process may be practiced on uncalcined clay and includes the addition of a source of fluoride ions, such as H.sub.2 SiF.sub.6, to the at least 36 weight percent hydrochloric acid leach liquor. An optional preleaching step utilizing 2N to 6N mineral acid is also disclosed.
摘要翻译： 一种从高岭土生产基本上纯的氧化铝的方法，通过以可溶形式除去在铝保持不溶形式时污染氧化铝的杂质。 这是通过用至少36重量％盐酸的煅烧高岭土浸出来溶解杂质并将铝转化成不溶性氯化铝并通过注入盐酸将浸出液中的盐酸浓度保持在至少36重量％来实现的 加油站。 然后将不溶性氯化铝与溶解的杂质分离，并进行第二浸出步骤以溶解并将其与二氧化硅g石分离。 从溶液中回收基本纯的AlCl3.6H2O晶体，并通过常规方法转化为氧化铝。 在一个替代实施方案中，该方法可以在未煅烧的粘土上实施，并且包括向至少36重量％的盐酸浸出液中加入氟离子源，例如H 2 SiF 6。 还公开了使用2N至6N无机酸的任选的预漂洗步骤。
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公开(公告)号：US4107266A
公开(公告)日：1978-08-15
申请号：US818045
申请日：1977-07-22
申请人： Donald J. Bauer , Judith A. Eisele
发明人： Donald J. Bauer , Judith A. Eisele
摘要： Alumina is recovered from aluminum sulfate leach liquors by treatment of the liquor with HCl gas to the point of incipient crystallization of AlCl.sub.3.6H.sub.2 O, extraction of the resulting solution with a tertiary amine to remove iron, further treatment with HHl gas to precipitate AlCl.sub.3.6H.sub.2 O and roasting of the AlCl.sub.3.6H.sub.2 O to Al.sub.2 O.sub.3.
摘要翻译： 氧化铝从硫酸铝浸出液中回收，通过用HCl气体处理液体至AlCl3.6H2O的初期结晶点，用叔胺萃取所得溶液以除去铁，进一步用HHl气体处理以沉淀AlCl 3·6H 2 O 并将AlCl3.6H2O焙烧成Al2O3。
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公开(公告)号：US4105747A
公开(公告)日：1978-08-08
申请号：US805378
申请日：1977-06-10
申请人： Judith A. Eisele , Donald J. Bauer
发明人： Judith A. Eisele , Donald J. Bauer
摘要： A hydrated metal salt is dehydrated to its anhydrous form by dissolving the metal salt hydrate in an organic solvent; and contacting the solvent solution of metal salt hydrate with a molecular sieve of a pore size sufficient to permit the absorption of water molecules but of a size too small to absorb solvent molecules.
摘要翻译： 将金属盐水合物溶解在有机溶剂中，将水合金属盐脱水成无水形式; 并使金属盐水合物的溶剂溶液与孔径大小足以允许吸收水分子但分子量过小的吸收溶剂分子的分子筛接触。
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公开(公告)号：US4260589A
公开(公告)日：1981-04-07
申请号：US56151
申请日：1979-07-10
CPC分类号： C01F7/34
摘要： Aluminum nitrate solutions are subjected to hydrolysis at elevated temperature and pressure, with the pressure being kept relatively low by continual bleeding of reactant gases from the reaction vessel. The resultant product is a noncrystalline alumina that may be readily converted to crystalline alumina by roasting.In addition, the discharged reactant gases are employed for leaching of clay to provide aluminum nitrate feed solution.
摘要翻译： 硝酸铝溶液在升高的温度和压力下进行水解，通过来自反应容器的反应物气体的持续渗出，压力保持相对较低。 所得产物是非结晶氧化铝，其可以通过焙烧容易地转化为结晶氧化铝。 此外，排出的反应气体用于浸出粘土以提供硝酸铝进料溶液。
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公开(公告)号：US4094955A
公开(公告)日：1978-06-13
申请号：US809882
申请日：1977-06-24
摘要： Alumina monohydrate is produced by leaching calcined clay and subjecting the leach liquor to pressure hydrolysis wherein the vapor and heat resulting from the pressure hydrolysis are directly utilized for leaching of the calcined clay. The aluminum monohydrate may be roasted to yield alumina.
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公开(公告)号：US4044115A
公开(公告)日：1977-08-23
申请号：US702262
申请日：1976-07-02
摘要： Alumina monohydrate is produced by treating aluminum nitrate solution at a temperature of about 250.degree. to 350.degree. C and a pressure of about 500 to 2500 psig.
摘要翻译： 氧化铝一水合物通过在约250℃至350℃的温度和约500至2500psig的压力下处理硝酸铝溶液来制备。
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公开(公告)号：US4554058A
公开(公告)日：1985-11-19
申请号：US710759
申请日：1985-03-11
IPC分类号： C25C1/20
CPC分类号： C25C1/20
摘要： An electrolytic process for the desorption of precious metals such as goldnd silver. The precious metal complexes are loaded on activated carbon particles that are packed into a hollow, cylindrical graphite container and the container is connected as the anode of an electrolytic cell. The electrolyte is a suitable alkaline solution and the cathode can be graphite, antimony or copper. Upon the application of an electric current, the precious metal complexes are desorbed and reduced to precious metals on the cathode.
摘要翻译： 用于解吸贵金属如金和银的电解方法。 贵金属配合物装载在填充到中空的圆柱形石墨容器中的活性炭颗粒上，并且容器作为电解池的阳极连接。 电解液是合适的碱性溶液，阴极可以是石墨，锑或铜。 在施加电流时，贵金属络合物被解吸并还原成阴极上的贵金属。
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