ZINC PRODUCTION METHOD USING ELECTRIC FURNACE DUST AS RAW MATERIAL

摘要

A zinc production method including a chlorination step 101 at which crude zinc chloride vapor 3 and an oxygen gas 2 are obtained by bringing electric furnace dust 1 containing zinc oxide or secondary dust 1 generated at the time of reducing the electric furnace dust in a reduction furnace into contact with a mixed gas containing a chlorine gas 8 and an oxygen-containing gas 10, converting a zinc oxide component in the electric furnace dust 1 or the secondary dust 1 into zinc chloride, and vaporizing the zinc chloride. The zinc production method further includes purification steps 102, 104, and 105 at which a zinc chloride component contained in the crude zinc chloride vapor 3 is separated from components 5 and 7 other than zinc chloride contained in the crude zinc chloride vapor 3 to obtain a purified zinc chloride melt 6, and an electrolysis step 103 at which the purified zinc chloride melt 6 is electrolyzed to obtain a zinc melt 9 and the chlorine gas 8.

主权项

1. A zinc production method comprising:
a chlorination step of obtaining crude zinc chloride vapor by bringing electric furnace dust containing zinc oxide or secondary dust generated at a time of reducing the electric furnace dust in a reduction furnace into contact with a mixed gas containing a chlorine gas and an oxygen-containing gas, converting a zinc oxide component in the electric furnace dust or the secondary dust into zinc chloride, and vaporizing the zinc chloride; a purification step of obtaining purified zinc chloride by separating a zinc chloride component contained in the crude zinc chloride vapor from components other than zinc chloride contained in the crude zinc chloride vapor; and an electrolysis step of obtaining a zinc melt and a chlorine gas by electrolyzing a molten salt electrolytic bath in which the purified zinc chloride is melted.