(北京工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，北京 100124)
摘 要: 研究不同配合-沉淀體系中鐵與鈷、鎳的分離性能。通過熱力學(xué)理論計算預(yù)測碳酸體系、氨水體系和碳酸-氨水體系中溶液金屬離子濃度與pH值之間的關(guān)系，結(jié)合實驗確定碳氨體系具有最佳的除鐵效果，能保證較小的鈷、鎳損失，且有利于后續(xù)鈷、鎳的分離。通過條件實驗確定碳氨體系最佳除鐵工藝條件如下：(CoNi)/Fe3+濃度比為1.5~2.5，氨水濃度為1 mol/L，Na2CO3濃度為0.01 mol/L，pH值為4.0。在(CoNi)/Fe3+濃度比為2.5，其他條件為最佳條件時，除鐵率＞99%，鈷的損失率為11.4%，鎳的損失率為10.6%。該方法除鐵效果明顯、過濾性能良好，具有較好的應(yīng)用前景。
關(guān)鍵字: 配合-沉淀體系；鈷；鎳；除鐵
（College of Material Science and Engineering, Beijing University of Technology, Beijing 100124, China）
Abstract:The separation properties of ion to cobalt and nickel in complexation-precipitation system were studied. The relationship between metal ion concentration and pH value in the complexation-precipitation systems of carbonate system, ammonia system and carbonate-ammonia system was simulated by the thermodynamic calculation. Combined with the experiments, the carbonate-ammonia system was considered as the best ion-removal system, which can guarantee a high iron removal efficiency, small amount of cobalt, nickel lost, and is conducive to the subsequent separation of cobalt and nickel. The results show that the optimal ion-removal conditions in carbonate-ammonia system are determined as follows: (CoNi)/ Fe3+ concentration ratio of 1.5-2.5; ammonia concentration of 1 mol/L; Na2CO3 concentration of 0.01 mol/L; pH value of 4.0. Under this condition of (CoNi)/ Fe3+=2.5, the ion-removal rate is over 99%, the cobalt loss rate is about 11.4%, and the nickel loss rate is 10.6%. This ion-removal method has the advantages of high iron removal efficiency, favorable filtration performance and good application prospect.
Key words: complexation-precipitation system; cobalt; nickel; ion removal
