(東北大學 材料與冶金學院，沈陽 110819)
摘 要: 在單因素實驗的基礎上，研究操作過程各因素對除鐵率及鈷回收率的影響，并采用中心復合設計實驗方法對除鐵過程進行優(yōu)化建模。結果表明：部分水解針鐵礦法(即E.Z針鐵礦法)適用于含鈷生物浸出液的除鐵過程，得到的數學模型與實驗結果具有較高吻合度，偏差的絕對值小于1%。該模型的方差分析結果顯示，在pH值為3.5~4.5的范圍內，除鐵率的主要影響因素為溫度、晶種量及其交互作用，而pH值與晶種量之間的交互作用對除鐵率的影響可被忽略；鈷回收率的主要影響因素為pH值及pH值與晶種量之間的交互作用。該模型可用于生產中針鐵礦除鐵過程控制參數的優(yōu)化。
關鍵字: 鈷；生物浸出；除鐵；針鐵礦法；中心復合設計；等高線圖
（School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China）
Abstract:The central composite design experimental method was employed to establish and optimize the model of iron removal process on the basis of the single factor experiment. Meanwhile, the influencing factors of the iron removal rate and the cobalt recovery were also discussed. The results show that, E.Z goethite method is suitable for the iron removal process from the cobaltiferous bioleaching solution, and its mathematical model is well fitted with the trial result. Their absolute deviation is less than 1%. The results of model variance analysis show that, when the pH value is in the range of 3.5-4.5. Temperature, the amount of seed crystal and the interaction between them are the main control factors for the iron removal rate. The interaction between the amount of seed crystal and pH value affects the iron removal rate weakly. It is also found that the cobalt recovery changes markedly with pH value, and the interaction between pH value and the amount of seed crystal. Besides, the model can be used to optimize the control parameters of the iron removal process.
Key words: cobalt; bioleaching; iron removal; goethite process; central composite design; contour map
