Method of recovering zinc powder by utilizing exhaust gas generated by electric furnace zinc smelting

Abstract

The invention relates to the field of electric furnace zinc smelting, and discloses a method of recovering zinc powder by utilizing exhaust gas generated by electric furnace zinc smelting. The method is characterized in that the exhaust gas output after primary cooling is subjected to secondary cooling, tertiary cooling, gravity storage and bag dust collection sequentially, and zinc in the exhaust gas is recovered gradually. The method is simple in technology and convenient to operate; a repeated smelting technology which requires sedimentation, refloatation, granulating, drying and furnace remelting in the prior art is avoided effectively, a large amounts of manpower and material resources are saved, electric energy, and substantive investment cost and production cost are also saved, the method is very environment-friendly, a recovery rate of zinc can reach above 99%, and the purposes of energy conservation and consumption reduction are achieved.

Description

technical field [0001] The invention relates to the field of electric furnace zinc smelting, in particular to a method for recovering zinc powder from waste gas produced by electric furnace zinc smelting. Background technique [0002] At present, since the successful development of the splash condenser, the electric furnace zinc smelting technology has taken a big step forward, changing the history of the past two-stage smelting into one-stage smelting. Since the zinc plant started production, until now the mixed gas output from the zinc smelting electric furnace has been condensed by a splash condenser to obtain zinc liquid, and then made into crude zinc; and the splash condenser condenses in the process, including zinc vapor and The exhaust gas of carbon monoxide is washed and recovered through the scrubber (i.e., the secondary cooling water tower, water seal), but the substance recovered through the scrubber is water blue powder. After precipitation, salvage, granulation...

AI Technical Summary

Problems solved by technology

[0002] At present, since the successful development of the splash condenser, the electric furnace zinc smelting technology has taken a big step forward, changing the history of the past two-stage smelting into one-stage smelting. Since the zinc plant started production, until now the mixed gas output from the zinc smelting electric furnace has been condensed by a splash condenser to obtain zinc liquid, and then made into crude zinc; and the splash condenser condenses in the process, including zinc vapor and The exhaust gas of carbon monoxide is washed and recovered through the scrubber (i.e., the secondary cooling water tower, water seal), but the substance recovered through the scrubber is water blue powder. After precipitation, salvage, granulation and drying, and then return to the furnace for smelting, this repeated treatment process greatly increases the cost of electric furnace zinc smelting, and the zinc recovery rate of this water shower method can only reach 94%-96% , the zinc content in the exhaust gas discharged after water rinsing is relatively high, and the direct discharge will cause serious air pollution; the water indigo powder produced by water rinsing requires a lot of manpower and material resources to be precipitated and salvaged, and the salvaged water indigo powder needs to go through Remelting after granulation and drying, and the continuous remelting produces a large amount of sewage, which is difficult to handle and the treatment fee is very expensive; the remelting process is too complicated, wasting a lot of manpower and material resources, and remelting will increase electric energy Moreover, part of the zinc will be discharged into the air every time it is returned to the furnace for smelting, which is not conducive to environmental protection and energy saving.