(1. 北京科技大學(xué) 土木與環(huán)境工程學(xué)院，北京 100083；
2. 中國科學(xué)院 過程工程研究所 生化工程重點(diǎn)實(shí)驗(yàn)室，北京 100190)
摘 要: 采用高濃度堿浸對氰化尾渣進(jìn)行預(yù)脫硅處理，考察攪拌速度、固液比、NaOH濃度及溫度對硅浸出速率的影響，研究脫硅過程的反應(yīng)動(dòng)力學(xué)，得到相應(yīng)的動(dòng)力學(xué)方程。結(jié)果表明：當(dāng)攪拌速度為400 r/min、固液比為1:5、NaOH濃度為80%、反應(yīng)溫度為280 ℃時(shí)，二氧化硅的浸出率為91.8%；堿浸過程受產(chǎn)物層內(nèi)擴(kuò)散控制，表觀反應(yīng)活化能為37.375 kJ/mol。通過正交實(shí)驗(yàn)對氰化浸金的條件進(jìn)行了優(yōu)化，在SiO2浸出率為91.8%，NaCN濃度為1.5 g/L，固液比為1:3，浸出時(shí)間為48 h的條件下，金的浸出率為87.83%。
關(guān)鍵字: 氰化尾渣；脫硅；堿浸出；氰化浸出
（1. Civil and Environmental Engineering School, University of Science and Technology, Beijing 100083, China;
2. National Key State Laboratory of Biochemical Engineering, Institute of Process Engineering,
Chinese Academy of Sciences, Beijing 100190, China）
Abstract:High-concentration alkaline leaching was used to treat cyanide residue for predesilication. The effects of stirring speed, solid-liquid ratio, initial NaOH concentration and reaction temperature on the leaching rate of silicon dioxide were studied. The kinetics of the desilication process was studied and the corresponding kinetics equation was established. The results show that the leaching rate of SiO2 reaches 91.8% under the condition of alkaline leaching reaction temperature of 280 ℃, reaction time of 5 h, NaOH concentration of 80%, the solid-liquid ratio of 1:5. The alkaline leaching process is controlled by the internal diffusion on the solid product layer and the apparent activation energy is 37.375 kJ/mol. The cyanide leaching conditions of gold were optimized by the orthogonal experiment. The leaching efficiency of gold is 87.83% under the condition of the leaching rate of SiO2 of 91.8%, NaCn concentration of 1.5 g/L, the solid-liquid ratio of 1:3, leaching time of 48 h.
Key words: cyanide residue; desilication; alkaline leaching; cyanide leaching
