专利检索 ap:("Walter Bludssus" OR "Erk-Rudiger Feuerhahn" OR "Horst Zimmermann") AND inv:"Erk-Rudiger Feuerhahn" 第 1 页

1.

发明授权
Process for the preparation of tantalum/niobium hydroxides and oxides with a low fluoride content 失效
标题翻译：用于制备具有低氟化物含量的钽/氢氧化镉和氧化物的方法

公开(公告)号：US5194232A

公开(公告)日：1993-03-16

申请号：US750519

申请日：1991-08-27

申请人： Walter Bludssus , Erk-Rudiger Feuerhahn , Horst Zimmermann

发明人： Walter Bludssus , Erk-Rudiger Feuerhahn , Horst Zimmermann

IPC分类号： C01G33/00 , C01G35/00

CPC分类号： C01G35/00 , C01G33/00 , C01P2006/80

摘要： Fluorine content of tantalum and niobium hydroxides is reduced to under 0.5 weight % by washing such hydroxide precipitates (as obtained by HF digestion and solvent extraction) with dilute ammonia (1 to 10%) and then water in two washing stages. The first washing stage includes a partial neutralization and the used wash water of the second stage is advantageously recycled, after adjustment of its ammonia concentration, for use as the first stage washing liquid.

摘要翻译： 通过用稀氨（1至10％）洗涤这种氢氧化物沉淀物（通过HF消化和溶剂萃取获得），然后在两个洗涤阶段中洗涤水，将钽和铌氢氧化物的含量降低至0.5重量％以下。第一洗涤阶段包括部分中和，并且在调节其氨浓度之后有利地将第二阶段的用过的洗涤水循环用作第一级洗涤液。