(黑龍江科技大學(xué) 礦業(yè)工程學(xué)院，哈爾濱 150022)
摘 要: 針對碘化浸出液中金回收效率低、電能消耗高等問題，采用電沉積法從碘化浸出液中電沉積金。考察陰極液金濃度、陽極液碘質(zhì)量分?jǐn)?shù)、陽極液n(I2):n(I-)、槽電壓對金沉積率的影響。采用響應(yīng)面法以陽極液碘質(zhì)量分?jǐn)?shù)、陽極液n(I2):n(I-)、槽電壓為變量因素，金沉積率為響應(yīng)值，研究各變量因素之間的交互作用以及對金沉積率的影響規(guī)律。結(jié)果表明：陽極液碘質(zhì)量分?jǐn)?shù)、陽極液n(I2):n(I-)和槽電壓與金沉積率的主效應(yīng)關(guān)系為：槽電壓＞陽極液n(I2):n(I-)＞陽極液碘質(zhì)量分?jǐn)?shù)，并得出了以金沉積率為響應(yīng)值的二階回歸方程。優(yōu)化后工藝條件為：陰極液金濃度10 mg/L、陽極液碘質(zhì)量分?jǐn)?shù)0.58%、陽極液n(I2):n(I-) 1:6.5、槽電壓12 V、電解時間2 h，三次驗(yàn)證實(shí)驗(yàn)的金沉積率均值為97.83%，與模型預(yù)測值98.15%十分接近，證明響應(yīng)面法優(yōu)化得到的二次多項(xiàng)式模型具有可行性。同時，該工藝條件適用于實(shí)際應(yīng)用，金沉積率仍可達(dá)97%以上。
關(guān)鍵字: 碘化浸出液；電沉積法；金沉積率；響應(yīng)面法；工藝條件
（School of Mining Engineering, Heilongjiang University of Science and Technology, Harbin 150022, China）
Abstract:In order to solve the problems of low recovery efficiency and high consumption of electric energy, gold was electrodeposited from the iodine leaching solution by electrodeposition. The effects of catholyte gold concentration, anolyte iodine mass fraction, anolyte n(I2):n(I-), and cell voltage on the gold deposition rate were investigated. Using the response surface method, the iodine mass fraction of the anode liquid, the n(I2):n(I-) in anode liquid, and the tank voltage were taken as variable factors, and the gold deposition rate was taken as the response value. The results show that the main effects of iodine mass fraction, anolyte n(I2):n(I-), and cell voltage on the gold deposition rate from greater to littler are cell voltage, anolyte n(I2):n(I-), anodic liquid iodine mass fraction, and a second-order regression equation with a response rate of gold deposition was obtained. The optimized process conditions are as follows catholyte gold concentration of 10 mg/L, anolyte iodine mass fraction of 0.58%, anolyte n(I2):n(I-) of 1:6.5, cell voltage of 12 V, electrolysis time of 2 h. The three times average gold deposition rate in the verification experiment is 97.83%, which is very close to the model prediction value of 98.15%, which proves that the quadratic polynomial model optimized by the response surface method is feasible. At the same time, the process conditions are suitable for practical application, and the gold deposition rate can still reach more than 75%.
Key words: iodinated leachate; electrodeposition method; gold deposition rate; response surface analysis; process conditions
