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Kinetics of α-FeO(OH)Formation in Weak Acidic Medium

By ZHANG Yi WANG Yingxia HUA Tongwen Institute of Chemical Metallurgy , Academia Sinica , Beijing , 100080 , China.Department of Chemistry , Peking University , Beijing , 100871 , China.To whom correspondence should be addressed.

材料科学技术（英）

The kinetics of α-FeO(OH) formation in weak acidic medium was studied.The effects of the initial concentration,temperature,pH value,partial pres- sure of oxygen,air flow rate and agitating intensity on the oxidation rate of Fe(OH)_2 suspensions have been investigated.It is confirmed that the reaction order for Fe(Ⅱ) is zero at the stage of α-FeO(OH) seeds formation,and about 0.5 at the stage of the seeds growth,and in the whole process partial pres- sure of oxygen appears in first order.The activation energy is determined.The dissolution-oxidation equilibrium which exists in the process of seeds formation has been suggested,by which the zero order reaction for Fe(Ⅱ) and the plateau in the pH-t curve were explained.Physical process is the rate-determining step of the heterogeneous reaction.The study on the kinetics of α-FeO(OH) formation may provide some fundamental informa- tion for the reactor design,the engineering amplifi- cation and the optimization control in the industrial process.

关键词: kinetics , null , null , null

θ Correction to the Analytical Expressions for Calculating Activities from Phase Diagrams Involving Intermediate Compounds

XIE Fanyou ZHANG Fan ZHOU Guozhi ** Beijing University of Science and Technology , Beijing , 100083 , China*** Institute of Chemical Metallurgy , Academia Sinica , Beijing , 100080 , China+ To whom correspondence should be addressed

材料科学技术（英）

A set of correct expressions for calculating activities and activity coefficients from binary phase diagrams involving intermediate compounds are presented in this paper by the introduction of a correct parameter θ. The application of these expressions to system Mg-Sn shows that they are quite feasible.

关键词: activity , null , null

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