【摘要】 采用离子交换-H2O-NaClO4-HCl梯度洗脱体系,对废铬液14次循环利用过程中的中性盐、铬配合物组分进行了跟踪测定。研究结果表明:整个循环过程中,中性盐由氯化钠型转化为硫酸钠型,并保持浓度稳定在0.82mol·L-1,铬配合物中阴/非离子型配合物组分稳定在3%～6%,带正电荷的配合物则由低价态逐渐向高价态转化,循环结束后,高价态配合物由51%增加到79%,配合物组成趋于稳定。更多还原

【Abstract】 A cation exchange resin associated with the elution system of H2O - NaClO4 - HCl was used to separate and de-terminate the distribution of chromium complexes in spent tanning liquors during tanning recycle. The results showed that neutral salt concentrations in spent liquors were invariable and changed from NaCl to Na2SO4 after 5 time - tannings. Chromium complexes from spent tanning liquors transformed gradually from the complexes with low positive charge to high positive charge by about 28% during whole tanning recycle.更多还原