采用硫代乙醇酸和乙酸酐对木质素进行改性,对所得新型吸附材料改性木质素的结构及其对铜精矿中金、铂、钯离子的吸附性能进行了研究。结果表明:搅拌吸附80 min达平衡,金、铂、钯的吸附量依次为50,50,25 μg·g-1。吸附在改性木质素上的金、铂、钯离子可用盐酸(1+99)溶液完全洗脱,用电感耦合等离子体原子发射光谱法测定此洗脱液中金、铂、钯离子的含量。金、铂和钯的检出限(3S/N)分别为0.041,0.16,0.16 mg·L-1。

Denatured lignin was prepared by the reaction of lignin with thio-glycolic acid and acetic anhydride. Structure of the denatured lignin and its adsorptivity toward Au, Pt and Pd ions in copper concentrates were studied in detail. It was found that the denatured lignin behaved to adsorb Au, Pt and Pd ions strongly and adsorption equilibrium was achieved by stirring with the lignin for 80 min. Values of adsorbility of Au, Pt and Pd ions at equilibrium were 50, 50, 25 μg·g-1. The 3 ions adsorbed on the surface of the lignin were completed desorbed by extracting with HCl (1+99) solution, in which their contents were determined by ICP-AES. Values of detection limit (3S/N) of Au, Pt and Pd ions found were 0.041, 0.16, 0.16 mg·L-1 respectively.