(1. 江西銅業(yè)集團(tuán)公司 江西銅業(yè)技術(shù)研究院有限公司，南昌 330096；
2. 江西銅業(yè)集團(tuán)公司 貴溪冶煉廠，貴溪 335424；
3. 南昌大學(xué) 化學(xué)學(xué)院，南昌 330031)
摘 要: 以銅陽(yáng)極泥中間物料分金渣為原料，提出一種“亞鈉分銀-酸化沉銀-凈化除雜-銀粉還原”的全濕法短流程制備高純銀粉的新工藝。對(duì)工藝的機(jī)理及最佳工藝條件進(jìn)行研究，在最佳工藝條件下，銀的浸出率達(dá)到98.4%，粗氯化銀中雜質(zhì)元素Pb和Te的脫除率分別為97.7%和96.7%，銀的直收率到達(dá)98.1%。采用OES、XRD、SEM檢測(cè)方法對(duì)產(chǎn)物的化學(xué)成分、表觀形貌和晶體結(jié)構(gòu)分析。結(jié)果表明：制備出顆粒均勻的99.995%高純銀粉。
關(guān)鍵字: 銅陽(yáng)極泥；分金渣；全濕法；短流程；高純銀粉
（1. Jiangxi Copper Technology Research Institute Co., Ltd., Jiangxi Copper Corporation, Nanchang 330096, China;
2. Guixi Smelter, Jiangxi Copper Corporation, Guixi 335424, China;
3. College of Chemistry, Nanchang University, Nanchang 330031, China）
Abstract:The copper anode slime intermediate material gold separating residue was used as raw material and a new hydrometallurgical process of high purity sliver powder preparation was proposed, the process comprising following steps: sodium sulfite leaching silver, acidification deposit silver, purification and sliver reduction. The reaction mechanism and optimum conditions of process were investigated. Under the optimum conditions, the leaching rate of silver reaches 98.4%, the removal rates of impurity element Pb and Te in silver chloride reach 97.2% and 96.7%, respectively, and the direct recovery rate of Ag reaches 98.1%. The chemical composition, morphology and crystal structure of product were analyzed by optical emission spectrometry (OES), scanning electron microscopy (SEM) and X-ray diffractometry (XRD), respectively. The results show that high purity 99.995% silver powder with uniform morphology and particle is prepared.
Key words: copper anode slime; gold separating residue; full hydrometallurgy; short process; high purity sliver powder
