PEMODELAN MATEMATIKA TRANSPORT MASSA PADA KONVERSI TOPOKIMIA REDUKSI BESI OKSIDA

• Main Author: MILANDIA (NIM : 22108015), ANISTASIA
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/19896
• Institution: Institut Teknologi Bandung

Conversion of mass transport processes in reduction of iron oxide into sponge iron is a process that involves chemical reactions simultaneously. Iron oxide reduction reaction consists of multistep reactions or intermediate reaction which is a phase change from hematite (Fe2O3) into magnetite (Fe3O4), magnetite (Fe3O4) into wustite phase (FeO) and the last is a phase change from wustite (FeO) into metallic Fe. Besides, there is existence boudouard reaction to produce gas reductant . Previously, mass conversion model of iron oxide reduction assumed that the intermediate oxide thickness is very thin, so the reduction reaction which is a multistep simplified into one reaction. Therefore, to integrate the three intermediate reactions, were developed a mathematical model which is solved numerically using computer software. <br /> <br /> <br /> By considering the reduction and reaction time on the reaction and kinetics intrinsic of reaction the solution of the models can be estimated rate of reduction reaction, as well as estimates of consumption rate of reducing agent as appropriate. In this research to obtain solutions of mathematical models, the conversion of iron oxide into metallic iron assumed isothermal conditions with dimensions on the spherical. While the mixture pellet properties like thermal conductivity depends on temperature and the changes in pellet dimensions such as swelling and shrinkage are negligible. <br /> <br /> <br /> Simulations were conducted at several temperatures and processing time of reduction. Temperature and time in the simulated namely 1012, 1035, 1027 and 1100K and 300, 600, 900 seconds. From the simulation with minimum temperature 1012K at 300 seconds is obtained, the total fractions of the concentrations of hematite, magnetite and wustit respectively each reach 0.7 , 0.3 and 0. While at the time of 600 seconds and temperature simulations 1129K, the number fraction of the concentrations of hematite, magnetite and wustite respectively each is 0.15, 0.85, 0.