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1. 发明授权

EP0477450B1 Method for recovery of tungsten from spent catalysts 失效
标题翻译：一种用于从废催化剂中回收钨的方法
公开(公告)号：EP0477450B1
公开(公告)日：1996-03-13
申请号：EP90314212.3
申请日：1990-12-21
申请人： GTE PRODUCTS CORPORATION
发明人： Miller, Michael J. , Vanderpool, Clarence D.
IPC分类号： C22B34/36 , C01G41/00
CPC分类号： C01G41/00 , C22B7/009 , C22B34/365 , Y02P10/214 , Y02P10/23 , Y02P10/234

2. 发明公开

EP0477450A1 Method for recovery of tungsten from spent catalysts 失效
标题翻译： Verfahren zurRückgewinnungvon Wolfram aus verbrauchten Katalysatoren。
公开(公告)号：EP0477450A1
公开(公告)日：1992-04-01
申请号：EP90314212.3
申请日：1990-12-21
申请人： GTE PRODUCTS CORPORATION
发明人： Miller, Michael J. , Vanderpool, Clarence D.
IPC分类号： C22B34/36 , C01G41/00
CPC分类号： C01G41/00 , C22B7/009 , C22B34/365 , Y02P10/214 , Y02P10/23 , Y02P10/234
摘要： A method for recovering tungsten from a tungsten containing spent catalyst comprises digesting the catalyst in aqueous sodium hydroxide solution wherein the mole ratio of the sodium hydroxide to the tungsten contained in the spent catalyst is from about 2.6 to about 4.2 and wherein the amount of water is sufficient to dissolve the subsequently produced sodium tungstate, at a temperature of at least about 90 o C for a length of time of at least about 1 hour to convert greater than about 77% by weight of the tungsten contained in the spent catalyst to sodium tungstate and form a sodium tungstate solution thereof and a residue containing the balance of the starting tungsten, and separating the sodium tungstate solution from the residue. Essentially all of the tungsten is recovered as sodium tungstate by first grinding the catalyst prior to the digestion and by using a mole ratio of sodium hydroxide to tungsten of about 3.8 to 4.2.
摘要翻译：从含钨废催化剂中回收钨的方法包括在氢氧化钠水溶液中消化催化剂，其中氢氧化钠与废催化剂中所含的钨的摩尔比为约2.6至约4.2，其中水的量为足以在至少约90℃的温度下将随后生产的钨酸钠溶解至少约1小时的时间，以将废催化剂中所含钨的大于约77重量％转化为钨酸钠，形成钨酸钠溶液，剩余物含有起始钨，并将钨酸钠溶液与残留物分离。基本上所有的钨都是以钨酸钠的形式回收，首先在消化之前研磨催化剂，并使用约3.8至4.2的氢氧化钠与钨的摩尔比。

3. 发明公开

EP0194346A1 Recovery of tungsten from ammoniacal solutions 失效
标题翻译：从氨溶液钨的回收。
公开(公告)号：EP0194346A1
公开(公告)日：1986-09-17
申请号：EP85115064.9
申请日：1985-11-27
申请人： GTE Products Corporation
发明人： Scheithauer, Richard A. , Vanderpool, Clarence D. , Macinnis, Martin B. , Miller, Michael J.
IPC分类号： C22B34/36 , C01G41/00
CPC分类号： C22B3/0012 , C01G41/003 , C22B34/36 , Y02P10/234
摘要： A method is disclosed for recovering tungsten from a relatively dilute ammoniacal tungsten solution. The method involves adding hexamethylenetetramine to the tungsten solution in an amount sufficient to form a hexamethylenetetramine complex then adjusting the pH to from about 1.0 to about 2.0 with a mineral acid to form a precipitate of the complex containing at least about 99% of the tungsten, and separating the precipitate from the resulting mother liquor.

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