本文报导铀在碱式碳酸锌吸附剂固——液界面分配的台阶型吸附等温线.它有一个“拐点”,两个“平台”.表明铀与碱式碳酸锌的阴离子交换过程是分级进行的.在pH等于7.4的条件下,铀与碱式碳酸锌的交换过程可能是R-OH+[UO_2(OH)_3]??R-UO_2(OH)_3+OH~- 由分级离子交换等温线计算得到交换过程中的热焓变化.作图法求得分级离子交换平衡常数 This paper reports the step-type adsorption isotherm for the uranium distribution at the solid-liquid interface of a basic zinc carbonate adsorbent. It has an “inflection point” and two “platforms.” It shows that the anion exchange process between uranium and basic zinc carbonate is graded .Under the condition of pH equal to 7.4, the exchange process between uranium and basic zinc carbonate may be determined by fractional ion exchange isotherms of R-OH + [UO 2 (OH) 3] R-UO 2 (OH) 3 + OH ~ The enthalpy change in the process of exchange was calculated and the equilibrium ion exchange equilibrium constant