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    • 6. 发明授权
    • Removal of impurites from clay
    • 从粘土中去除杂质
    • US4239735A
    • 1980-12-16
    • US72957
    • 1979-09-06
    • Judith A. EiseleDonald J. BauerPaul R. Bremner
    • Judith A. EiseleDonald J. BauerPaul R. Bremner
    • C01F7/22
    • C01F7/22
    • 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.
    • 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。