VON PLESSEN, HELMOLD,GRADL, REINHARD,SCHIMMEL, GUENTHER
申请号：
US19830481281
公开号：
US4479924(A)
申请日:
1983.04.01
申请国别(地区):
美国
年份:
1984
代理人:
摘要：
A process for the separation of heavy metal components, especially of compounds of cadmium, mercury and lead, from crude phosphoric acid obtained according to the Odda process, which comprises adjusting this crude phosphoric acid with ammonia to a pH of from 0.5 to 1.5, contacting it subsequently with a diorganyl-dithiophosphorus compound and an adsorbent, and then separating the acid from the absorbent containing the heavy metal impurities.
