纳滤膜去除硝酸银中痕量多价金属的研究
作者:夏焕锦12,李海港12*,汪阳卿12,殷浩12,孙攀12
单位: 1. 武汉船用电力推进装置研究所,武汉,430064 2.武汉长海高新技术有限公司,武汉,430223
关键词: 纳滤;硝酸银;工业料液;优级纯
出版年,卷(期):页码: 2016,36(5):101-105

摘要:
 为获得优级纯硝酸银产品,采用纳滤膜去除硝酸银工业料液中的铜、铁、铅和铋等杂质金属离子,研究了不同操作条件对分离性能的影响。循环模式中操作压力为0.5MPa时,银的透过率在96%以上,杂质金属离子的截留率均大于85%,银和铜、铁、铅、铋的分离系数分别为16.8、48.3、6.9和19.3。透膜通量和分离系数均随着操作压力的升高而增大。截留液回流模式试验中87.6%的银进入透过液,90%以上的杂质金属离子保留在截留液中,硝酸银符合国标GB/T670-2007中优级纯标准。结果表明纳滤膜可有效地实现银离子与铜、铁、铅和铋多价离子的分离。纳滤膜处理杂质离子较高的结晶母液时,单级分离效率较低,可通过多级过滤的方式提高分离效率。
 Silver nitrate aqueous solution was purified by nanofitration (NF) membrane to obtain the guarantee reagent. The effect of operation conditions on the separation efficiency was discussed. In recycling mode, the operating pressure is fixed at 0.5 MPa. The permeate rate of Ag+ is 96% and the rejection rate of multivalent metal ion is above 85%. The separation factor between Ag+ and Cu2+, Fe3+, Pb2+ and Bi3+ was 16.8, 48.3, 6.9 and 19.3, respectively. The permeate flux and separation factor are increased with the operating pressure increasing. In continuous mode, Ag+ is separated from multivalent metal ion with permeate rate of 87.6%, and the retention rate of multivalent ion is above 90%. The silver nitrate can meet guarantee reagent standard in GB/T670-2007. The results indicated that Ag+ can be effectively separated from multivalent metal ion, such as Cu2+, Fe3+, Pb2+ and Bi3+. The separation efficiency was not satisfied by only one NF pass when the feed water had high multivalent metal ion concentration such as crystallized mother liquor. NF was suggested to be conducted for more times in series to achieve high separation efficiency. 
第一作者简介:夏焕锦(1973-),男,学士,武汉船用电力推进装置研究所,高级工程师,从事节能环保研究。*通讯作者,Email:lihigang@163.com

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