Prepn. of polyampholyte ion exchange resins - contg. amino-phosphinic acid gps., for selective adsorption of heavy and non-ferrous metals

摘要

Polyampholyte resins containing alpha-amino phosphinic acid gps. are made from animated, crosslinked chloromethylated styrene co-polymers contg. primary and sec. amino gps., by reaction with formalin and a hypophosphite salt, acid medium. Resins with high tungsten capacity, of 500-900 mg./g. over a wide pH range, are obtd. The polar CH2OH gp. attached to a P atom, increased hydrophilicity, improving access of water into the granules and the sorption and desorption kinetics. Complete desorption of W ions is achieved with dilute ammonia solns. Used for selective extn. of anions and cations contg. heavy and non-ferrous metals from solns. and suspensions in hydro-metallurgical processes, e.g. sulphite leaching of W/Mo concentrate, and from plating solns. and sea water.