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    • 65. 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。
    • 67. 发明授权
    • Process for the preparation of pure aluminum oxide
    • 纯氧化铝的制备方法
    • US4224287A
    • 1980-09-23
    • US32904
    • 1979-04-24
    • Siegfried ZiegenbalgGerhard FischerGerhard HaakeRudolf Siebert
    • Siegfried ZiegenbalgGerhard FischerGerhard HaakeRudolf Siebert
    • C01F7/20C01F7/22C01F7/30C22B3/28C22B3/38
    • C01F7/306C01F7/22C22B3/0012C22B3/0068C01P2006/11C01P2006/12Y02P10/234
    • In the process for the preparation of pure aluminum oxide by the steps of hydrochloric acid decomposition of mechanically or thermally activated clay or alumina containing minerals, separating the insoluble residue, removing the iron from the solution, crystallizing the aluminum chloride in the iron-free solution, thermally decomposing the crystallizate to aluminum oxide and recovering the hydrochloric acid from the decomposition gases, the improvement comprising effecting the process by the steps of mechanically pretreating the clay, drying the pretreated clay, thermally or mechanically activating the clay, subjecting the activated clay to circulating leaching, separating the leached material into an SiO.sub.2 containing residue and an AlCl.sub.3 solution, extracting the AlCl.sub.3 solution to an evaporating crystallization and thermally decomposing the crystals to produce .alpha.-Al.sub.2 O.sub.3. All of the stages are interrelated one to the other for maximum recovery of byproducts, heat, acid and the like. The .alpha.-Al.sub.2 O.sub.3 is directly produced in a form of high purity suitable for most applications.
    • 在通过盐酸分解机械或热活化的粘土或含氧化铝的矿物质的步骤制备纯氧化铝的过程中,分离不溶残余物,从溶液中除去铁,使无铁溶液中的氯化铝结晶 将结晶物热分解成氧化铝并从分解气中回收盐酸,其改进包括通过机械预处理粘土,干燥预处理的粘土,热或机械活化粘土,将活化的粘土 循环浸出,将浸出的材料分离成含SiO 2的残渣和AlCl 3溶液,将AlCl 3溶液萃取至蒸发结晶并热分解晶体以产生α-Al2O3。 所有的阶段都是相互关联的,用于副产物,热,酸等的最大回收。 直接以大多数应用的高纯度形式生产α-Al2O3。
    • 68. 发明授权
    • Ferric iron removal from aluminum fluoride solutions
    • 从氟化铝溶液中除铁
    • US4172879A
    • 1979-10-30
    • US895085
    • 1978-04-10
    • David J. MillerTadeusz K. Wiewiorowski
    • David J. MillerTadeusz K. Wiewiorowski
    • C01B7/19C01F7/20C01F7/22C01F7/50C01G49/00C22B3/38C22B3/40C01G49/10
    • C22B3/0095C01B7/191C01F7/20C01F7/22C01F7/50C01G49/0009C22B3/0093Y02P10/234
    • A process for the selective separation of ferric iron from an aluminum fluoride aqueous solution containing ferric iron is effected by contacting said solution with an organic extractant phase consisting essentially of a mixture of a mono (higher alkyl-substituted phenyl) phosphoric acid and a di(higher alkyl-substituted phenyl) phosphoric acid dissolved in an inert diluent to thereby transfer the ferric iron to said organic extractant phase. The efficiency of the process is further improved by adjusting the aluminum fluoride aqueous feed solution to a temperature in the range of about 140.degree. F. to about 175.degree. F. prior to contacting it with the organic extractant phase, maintaining the temperature within this range throughout the ferric iron extraction stage or stages, then heating the resulting iron-depleted aqueous raffinate to a temperature higher than 195.degree. F., and then crystallizing aluminum fluoride trihydrate out of the raffinate at this higher temperature.
    • 通过使所述溶液与基本上由单(高级烷基取代的苯基)磷酸和二(高级烷基取代的苯基)磷酸酯的混合物组成的有机萃取剂相接触来实现从含有三价铁的氟化铝水溶液中选择性分离三价铁的方法 高级烷基取代的苯基)磷酸溶解在惰性稀释剂中,从而将三价铁转移到所述有机萃取剂相。 在将氟化铝水性进料溶液与有机萃取剂相接触之前将氟化铝水性进料溶液调节至约140°F至约175°F的温度,进一步提高了该方法的效率,将温度保持在该范围内 在整个三铁提取阶段或阶段,然后将得到的贫铁水提余液加热到高于195°F的温度,然后在更高的温度下从提余液中结晶出氟化铝三水合物。
    • 69. 发明授权
    • Recovery of alumina from siliceous minerals
    • 从硅质矿物中回收氧化铝
    • US4158042A
    • 1979-06-12
    • US946345
    • 1978-09-27
    • John E. Deutschman
    • John E. Deutschman
    • C01F7/22C01F7/20
    • C01F7/22
    • A process for the production of alumina from siliceous minerals containing substantial quantities of combined aluminium and calcium comprises the steps of treating the finely divided mineral with a hot acid liquor containing chloride, fluoride and calcium ions to extract alumina values from the mineral; recovering aluminium chloride from the liquid extract; recycling one fraction of the spent extract to the mineral extraction stage; and treating another fraction of the spent extract to regenerate hydrogen chloride gas for re-use in the process.
    • 含有大量组合铝和钙的含硅矿物的氧化铝生产方法包括以下步骤:用含有氯化物,氟化物和钙离子的热酸液处理细碎矿物,从矿物中提取氧化铝值; 从液体提取物中回收氯化铝; 将一部分废弃的提取物回收到矿物提取阶段; 并处理另一部分的废提取物以再生氯化氢气体以便在该过程中重复使用。