| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for selectively extracting Bi from an aq. soln. contg. Bi and Fe. SOLUTION: Bismuth is recovered from an aq. soln. of bismuth and iron. In this case, a soln. of bis(2,4,4-trimethylbenzyl) bis(2,4,4-trimethylbenzyl) dithiophosphinic acid in kerosine is brought into contact with the aq. soln. and mixed to extract bismuth in the kerosine soln., the kerosine soln. from the extraction stage is brought into contact with a nitric acid soln. to strip bismuth in the nitric acid soln., and bismuth is recovered.</p> |
