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公开(公告)号：US5279789A
公开(公告)日：1994-01-18
申请号：US920540
申请日：1992-07-28
CPC分类号： B01J23/10 , C01F17/0012 , C01F17/0043 , C01P2002/04 , C01P2002/60 , C01P2006/13 , C01P2006/14 , C01P2006/16
摘要： Ceric oxide particulates having a specific surface of at least 190 m.sup.2 /g, measured after calcination at a temperature of from 350.degree. to 450.degree. C., and a specific surface of at least 15 m.sup.2 /g after calcination at 800.degree. C., are prepared by (a) suspending, in an aqueous solution of a decomposable base, a ceric hydroxide of the formula (I):Ce(M).sub.x (OH).sub.y (NO.sub.3).sub.z (I)wherein M is an alkali metal or a quaternary ammonium radical; x is a number ranging from 0.01 to 0.2; y is such that y=4-z+x; and z is a number ranging from 0.4 to 0.7; (b) heating the resulting suspension in a confined reaction zone to a temperature and pressure respectively lower than its critical temperature and pressure; (c) cooling such reaction medium and permitting it to return to atmospheric pressure; (d) separating the ceric hydroxide thus treated; and (e) calcining the separated ceric hydroxide.
摘要翻译： 在350摄氏度至450摄氏度的温度下焙烧后测定的比表面积至少为190m 2 / g的氧化铈颗粒，800℃煅烧后的比表面积至少为15m 2 / g， 通过（a）在可分解碱的水溶液中悬浮式（I）的Ce（M）x（OH）y（NO 3）z（I）的氢氧化铈：其中M是碱金属或 季铵基; x为0.01〜0.2的数; y为y = 4-z + x; z为0.4〜0.7的数; （b）将受限反应区中得到的悬浮液加热到分别低于其临界温度和压力的温度和压力; （c）冷却该反应介质并使其回到大气压; （d）分离如此处理的氢氧化铈; 和（e）煅烧分离的氢氧化铈。
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公开(公告)号：US5891412A
公开(公告)日：1999-04-06
申请号：US917218
申请日：1997-08-25
CPC分类号： B01J23/10 , C01F17/0012 , C01F17/0043 , C01P2002/04 , C01P2002/60 , C01P2006/13 , C01P2006/14 , C01P2006/16
摘要： Ceric oxide particulates having a specific surface of at least 190 m.sup.2 /g, measured after calcination at a temperature of from 350.degree. to 450.degree. C., and a specific surface of at least 15 m.sup.2 /g after calcination at 800.degree. C., are prepared by (a) suspending, in an aqueous solution of a decomposable base, a ceric hydroxide of the formula (I):Ce(M).sub.x (OH).sub.y (NO.sub.3).sub.z (I)wherein M is an alkali metal or a quaternary ammonium radical; x is a number ranging from 0.01 to 0.2; y is such that y=4-z+x; and z is a number ranging from 0.4 to 0.7; (b) heating the resulting suspension in a confined reaction zone to a temperature and pressure respectively lower than its critical temperature and pressure; (c) cooling such reaction medium and permitting it to return to atmospheric pressure; (d) separating the ceric hydroxide thus treated; and (e) calcining the separated ceric hydroxide.
摘要翻译： 在350℃〜450℃的温度下焙烧后测定的比表面积至少为190m 2 / g的氧化铈颗粒，800℃煅烧后的比表面积至少为15m 2 / g， 通过（a）在可分解碱的水溶液中悬浮式（I）的Ce（M）x（OH）y（NO 3）z（I）的氢氧化铈：其中M是碱金属或 季铵基; x为0.01〜0.2的数; y为y = 4-z + x; z为0.4〜0.7的数; （b）将受限反应区中得到的悬浮液加热到分别低于其临界温度和压力的温度和压力; （c）冷却该反应介质并使其回到大气压; （d）分离如此处理的氢氧化铈; 和（e）煅烧分离的氢氧化铈。
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3.发明授权Essentially anhydrous admixtures of dehydrated rare earth halides and alkali/alkaline earth metal halides 失效脱盐稀土元素和碱金属/碱金属金属元素的绝对偏差
公开(公告)号：US5178664A
公开(公告)日：1993-01-12
申请号：US541939
申请日：1990-06-22
申请人： Francoise Picard
发明人： Francoise Picard
IPC分类号： C01F17/00
CPC分类号： C01F17/0056 , C01F17/0031 , C01F17/0068
摘要： Essentially anhydrous (i.e., containing no more than 2.5% by weight of water of hydration) admixtures of (i) dehydrated rare earth halides, (ii) at least 10% by weight of alkali and/or alkaline earth metal halides, and (iii) up to 4.5% by weight of rare earth oxyhalides, these halides being other than fluorides, are produced by mixing hydrated rare earth halides with alkali and/or alkaline earth metal halides and then raising the temperature of such admixtures, advantageously in the presence of a gaseous flux containing a dehydrating halocompound, to a value ranging from 150.degree. to 350.degree. C. as to essentially dehydrate the hydrated rare earth halides, the final admixtures are well adapted for the production of rare earth metals therefrom.
摘要翻译： （i）脱水稀土卤化物的混合物，（ii）至少10重量％的碱金属和/或碱土金属卤化物，和（iii） ）高达4.5重量％的稀土氧卤化物，这些卤化物不同于氟化物，是通过将水合稀土卤化物与碱金属和/或碱土金属卤化物混合，然后有利地在存在下提高这些混合物的温度， 含有脱水卤化合物的气态助熔剂，其温度范围为150-350℃，基本上使水合稀土卤化物脱水，最终的混合物很好地用于从其中制备稀土金属。
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