新型水溶性纤维素黄原酸酯的合成与表征及用于金回收的研究

用羧甲基纤维素(CMC)与CS_2在一定条件下进行反应,合成了一种新型的水溶性纤维素衍生物纤维素黄原酸酯(CMCX)。用UV及IR谱进行表征,测得酯化度为3.0％,即含S量1.0％(重量比)。对其稳定性进行了较系统的研究。结果表明CMCX在固态比溶液状态稳定得多,找到了一种较有效的助凝剂CaCl_2。在CaCl_2和CMCX共同作用下,对于10mL浓度为10mg/L的金液,CMCX的用量为0.1g,作用时间1min,对金回收率可达96％。

STUDISE ON THE PREPARATION AND CHARACTERIZATION OF WATER SOLUBLE CELLULOSE XANTHATE AND ITS APPLICATION IN THE RECOVERY OF GOLD

Several species of water soluble carboxyl methyl cellulose xanthate(CMCX) have been prepared by the reaction of CMC with CS_2 in aqueous solution. The product CMCX has been identified by UV spectrum. The degree of esterification is about 3.0％(i.e. 1.0％ of S in weight). It is more stablein the solid state than in the solution state. The efficiency of reovery Au from 10mg/L of Au aqueous solution can reach 96％ by using CaCl_2 as co—coagulant, and the reaction time is only 1 minute, pH does play an important role in increasing the efficiency of recovering Au, where the optimun pH value has been found to be 10-12. The optimum dosage of CMCX is 0.1 CMCX for 10mL of 10mg/L Au aqueous solution.