摘要
对采用单宁沉锗法提取锗金属的工艺过程中,单宁锗渣的处理方法进行了探索以寻求其中单宁回收再利用的方法。通过对单宁锗渣进行打浆处理,经由5%的草酸(以锗渣质量计,下同)预取代络合后,用10%的氢氧化钠调节pH值8～9,即可实现单宁和锗的分离。采用离心分离可得到单宁的水溶液和锗盐沉淀,单宁水溶液经过盐酸中和后,可部分代替新单宁再用于单宁沉锗的工艺过程中。试验结果表明在常温下水和单宁锗渣5∶1(mL∶g),采用5%的草酸处理,单宁锗分离的pH值控制为8～9的条件下,单宁的回收率可以达到50%。在回收单宁的用量为28倍(以矿液中锗质量计)条件下,可以实现98%的锗回收率。
The disposing of the tannin-germanium slag, which was obtained during tannin-germanium precipitation process, was studied. The separation of tannin and germanium can be achieved by successively slurrying the tannin-germanium slag, complex- ation with oxalic acid and adjusting the pH value of the suspension to 8 - 9 with 10 % aqueous sodium hydroxide. The germanium salt is removed by centrifugal separation, and the aqueous tannin solution can be reused to extract germanium. The result shows that recovery rate of tannin can reach 50 %. Using 28 times of tannin as much as germanium, the recovery rate of germanium can be 98 %
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
2012年第5期93-96,共4页
Chemistry and Industry of Forest Products
基金
国家林业公益性行业科研专项资助项目(201004013)
关键词
单宁
锗渣
回收
草酸
碱
tannin
tannin-germanium slag
recycling
oxalic acid
sodium hydroxide
