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Method for working up zinc- and lead-bearing steel plant residues
Method for working up zinc- and lead-bearing steel plant residues
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机译:处理含锌和含铅钢铁厂残渣的方法
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摘要
The working-up of zinc- and lead-bearing metallurgical plant residues is carried out by thermal treatment in a circulating fluidised bed, the heat requirement being met by combustion of solid carbon in the fluidised-bed reactor of the circulating fluidised bed. The solid carbon content in the lower part of the fluidised bed is adjusted to 5 to 30%. Oxygen-containing gases are introduced into the upper part of the fluidised-bed reactor, and the formation of CO2 is taken only so far that metallic zinc is not reoxidised. The discharged suspension is largely freed of solids in a return cyclone, and the solids are recycled. The gas is cooled to a temperature at which the metallic zinc is oxidised to ZnO, and the zinc and lead compounds in the form of dust are precipitated from the gas. IMAGE
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