| The subject of this thesis is a study of the transport and chemical rate phenomena in the flash reduction of zinc calcine (60% Zn and 10% Fe) with carbon monoxide. In this process, zinc sulfide concentrates are first oxidized in a fluid bed roaster and the resulting zinc and iron oxides are then reduced with carbonaceous material and oxygen in a flash reactor to produce zinc vapor. The flash reduction process may offer environmental advantages and also use inexpensive coal instead of coke or electricity, as in the conventional processes for zinc production.;Thermogravimetric tests on cylindrical single zinc calcine pellets with CO at 900-1200;The results of the reduction tests were used in a mathematical model, simulating the phenomena occurring in the experimental flash reactor. This model projected the process characteristics, such as temperature, gas composition, velocity and degree of reaction, throughout the shaft.;Flash reduction tests in a CO-CO;There was fair agreement between the mathematical model projections and the flash experimental results. The observed low rates of reduction were also confirmed by the results of mini-pilot plant test by Outokumpu Research. This study showed that the rate of reduction of zinc calcines at 1200... |
