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公开(公告)号：US4761177A
公开(公告)日：1988-08-02
申请号：US66437
申请日：1987-06-26
CPC分类号： B22F9/26 , C22B23/0461
摘要： Fine cobalt or nickel powder is produced by hydrogen reduction of a sulfate solution in the presence of a base and a strong reductant such as a metal borohydride wherein the base is added stagewise to the solution with the initial addition of base being sufficient to insure an essentially neutral pH at the time of reductant addition.
摘要翻译： 在碱和强还原剂例如金属硼氢化物的存在下，通过硫酸盐溶液的氢还原来制备细钴或镍粉，其中碱与阶段性地加入到溶液中，初始添加碱足以保证基本上 还原剂添加时的中性pH值。
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2.发明授权
公开(公告)号：US4670229A
公开(公告)日：1987-06-02
申请号：US861690
申请日：1986-05-09
CPC分类号： C22B7/009 , C01F7/144 , C22B23/0446 , C22B34/225 , C22B34/345 , C22B34/365 , Y02P10/214 , Y02P10/23 , Y02P10/234
摘要： Metal values and alumina are recovered from spent, usually oily, catalysts by oxygen pressure leaching with sodium hydroxide and/or sodium aluminate to dissolve molybdenum, vanadium and/or tungsten and provide a solid, filterable residue containing alumina and cobalt and/or nickel, the residue is digested with sodium hydroxide to give a sodium aluminate solution and a residue enriched in nickel and/or cobalt, alumina is recovered from the sodium aluminate solution as a solid and the remaining supernatant solution is recycled to the oxygen pressure leaching step wherein the alumina content of the aluminate solution is precipitated and a bleed for metals in the aluminate solution is provided.
摘要翻译： 通过用氢氧化钠和/或铝酸钠进行氧压浸出来从废的，通常是油性的催化剂中回收金属值和氧化铝以溶解钼，钒和/或钨，并提供含有氧化铝和钴和/或镍的固体，可过滤的残余物， 残余物用氢氧化钠消化，得到铝酸钠溶液，富含镍和/或钴的残余物，作为固体从铝酸钠溶液中回收氧化铝，将剩余的上清液再循环至氧气压力浸出步骤，其中 铝酸盐溶液的氧化铝含量被沉淀，并且提供铝酸盐溶液中的金属渗出。
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公开(公告)号：US4149875A
公开(公告)日：1979-04-17
申请号：US883379
申请日：1978-03-06
CPC分类号： C22C1/0433 , B22F1/0088 , C22B23/06
摘要： A method is provided for decreasing the silicon content of relatively pure nickel and/or cobalt powder, wherein silicon is present as an impurity substantially in the oxidic state. The method comprises mixing the metal powder in an aqueous solution of an alkali metal hydroxide, e.g. sodium hydroxide, with the temperature of the solution ranging from ambient to below boiling and maintaining the powder in contact with the solution until the silicon content of the powder has been reduced to the desired level.
摘要翻译： 提供了用于降低相对纯的镍和/或钴粉末的硅含量的方法，其中硅作为基本上处于氧化态的杂质存在。 该方法包括将金属粉末混合在碱金属氢氧化物的水溶液中，例如 氢氧化钠，溶液的温度范围为环境温度至低于沸点，并保持粉末与溶液接触，直到粉末的硅含量降低到所需的水平。
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