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本文研究了Zn~(2+)、Cd~(2+)、Hg~(2+)、Ca~(2+)、Mg~(2+)、Pb~(2+),Co~(2+)、Ni~(2+)、Cu~(2+)等二价金属离子在CPP杨梅型树脂上的交换过程。CPP—Na/Me~(2+)的交换容量一般在3meq/g-R以上;动态交换20分钟以后,除Hg~(2+)离子外,可达2.3—3.2meq/g—R。(CPP)_2—Me的稳定性顺序测得为:Cu~(2+)>Zn~(2+)>Co~(2+)>Ni~(2+)>Cd~(2+)>Hg~(2+)>Mg~(2+)>Ca~(2+)。在不同pH溶液中,二价全属离子在溶液相和树脂相之间的分配系数表明,pH<2.5时(CPP)_2—Me容易被酸再生,并且当两种或两种以上的金属离子在给定的pH溶液中分配系数差足够大时,有希望获得淋洗分离。
In this paper, the effects of Zn2 +, Cd2 +, Hg2 +, Ca2 +, Mg2 +, Pb2 +, Co2 + ), Ni ~ (2 +), Cu ~ (2+) and other divalent metal ions in the CPP bayberry resin exchange process. The exchange capacity of CPP-Na / Me ~ (2+) is generally above 3 meq / g-R; after exchanging for 20 minutes, the exchange capacity of CPP-Na / Me 2+ can reach 2.3-3.2 meq / g-R in addition to Hg 2+ ions. The order of the stability of (CPP) 2-Me was determined as follows: Cu 2+ + Zn 2+ + Co 2+ + Ni 2+ + Cd 2+ + Hg ~ (2 +)> Mg ~ (2 +)> Ca ~ (2+). In different pH solutions, the partition coefficient between the solution phase and the resin phase of the bivalent metal ions indicates that (CPP) _2-Me is easily regenerated by acid at pH <2.5, and when two or more metal ions When the partition coefficient difference is large enough in a given pH solution, it is desirable to achieve a leach separation.