Mathematical modeling of Ni-lateritic ore drying in a rotary cylindrical kiln on a semi-industrial scale
Keywords:
mathematical modeling, thermal drying, lateritic Ni-ore, rotating horizontal cylinder, energy balanceAbstract
The lack of knowledge about the relationship between variables that characterize the thermal drying process prevents reaching the required moisture values in the Ni-lateritic ore at the exit of the rotating horizontal cylinder on a semi-industrial scale, with lowest possible fuel consumption and least impact on environment. For this reason, a steady state phenomenological model was established. This model consists of a system of differential equations and ordinary equations obtained from the mass and energy balances in the Ni-laterites ore, in the gas and in the wall of the dryer. Besides, from the bond equations that allow obtaining the thermophysical properties of the Ni-ore laterites and gases and the heat and mass transfer coefficients involved in the process, solved by using the fourth order Runger-Kutta numerical method. This model allows establishing the distribution temperature behavior of the gas, the Ni-laterites ore and the variation of moisture of the last one along the entire cylinder length.Downloads
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