| 摘要 |
PURPOSE:To minimize the amount of O2 to be blown and to maximize the chlorination efficiency by charging a mixture of finely powdered ZrO2 with finely powdered C and coarse-grained C into a chlorination furnace when an excess carbon combustion system fluidizing and chlorinating method is applied. CONSTITUTION:A shaft type chlorination furnace 1 is provided with a dispersion plate 3 at the bottom, and gaseous Cl2 and gaseous O2 are fed to a chamber 4 under the plate 3. In order to minimize the radiation of heat from the free board section 7, the furnace 1 is composed of a brick structure 9 as the innermost lining, a heat insulating material 10 and a steel plate 11 covering the outside of the material 10. A starting material charged into the furnace 1 forms a fluidized bed in the lower column 20 together with gaseous Cl2 and gaseous O2 blown up from the bottom, and the resulting ZrCl4 flows out of the outlet 6. The starting material is prepd. by kneading finely powdered ZrO2 with finely powdered C and by blending the kneaded material with coarse-grained C, and it is fed through a starting material feeder 5. The starting material is fed in a completely mixed state, and it is actively fluidized by contact with the gases.
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