(中南大學(xué) 冶金與環(huán)境學(xué)院，長沙 410083)
摘 要: 將有機高分子乳化分散等領(lǐng)域常見的剪切機引入濕法冶金領(lǐng)域針鐵礦除鐵過程，以ZnSO4-FeSO4溶液體系沉鐵過程為研究對象，開展高剪切強化針鐵礦法除鐵過程的宏觀動力學(xué)研究。采用單因素試驗法考察沉鐵過程溫度、pH、流場強化方式、剪切速率、氧氣濃度對沉鐵速率的影響。結(jié)果表明：溫度、pH、流場強化方式、剪切速率、氧氣濃度對沉鐵速率影響顯著。在此基礎(chǔ)上開展的動力學(xué)研究結(jié)果表明，針鐵礦法沉鐵受傳質(zhì)過程控制，高剪切強化針鐵礦法沉鐵符合一級反應(yīng)特征，F(xiàn)e2+氧化沉鐵的本征反應(yīng)級數(shù)為二級，反應(yīng)表觀活化能約為27.85 kJ/mol。
關(guān)鍵字: 剪切；流場強化；動力學(xué)；針鐵礦
（School of Metallurgy and Environment, Central South University, Changsha 410083, China）
Abstract:Shear used commonly in polymer emulsification and dispersion was introduced into the process of iron removal by goethite method in the field of hydrometallurgy. In order to study the macro-kinetic of iron removal by goethite process enhanced by high shear, ZnSO4-FeSO4 solution system was taken as research object. The effects of temperature, pH, strengthening way by flow field, shear-velocity and oxygen concentration on the velocity of iron removal were investigated by single factor test method. The results show that temperature, pH, strengthening way by flow field, shear-velocity and oxygen concentration have significant effects on the velocity of iron removal. Kinetic data based on the results show that the process of iron removal by goethite method is controlled by mass transfer process, and the reaction is in line with the characteristics of first-order reaction. The reaction of iron removal by goethite method by high shear is second-order with respect to Fe2+ with activation energy of 27.85 kJ/mol.
Key words: shear; strengthening way by flow field; kinetic; goethite
