Efficient recovery method of elementary substance zinc in zinc smelting tail gas of electric furnace

Abstract

The invention discloses an efficient recovery method of elementary substance zinc in zinc smelting tail gas of electric furnace. The method comprises the following steps of 1 ) preparing a quenching salt solution; 2) zinc smelting tail gas of the electric furnace subjected to condensation and zinc collecting is conveyed to a washing tower through a conveying pipeline, quenching on the tail gas bytaking the salt solution prepared in the step (1) in the washing tower as a washing solution, and collecting elementary substance zinc in the tail gas; and 3) collecting a zinc elementary substance and a washing liquid which are collected after quenching, collecting the zinc elementary substance and the washing liquid into a tower bottom, filtering and separating to recover elementary substance zinc, and the separated salt solution is subjected to salt supplementing and / or supplementing water and then returning to the step (2) for recycling. According to the method disclosed by the invention, the quenching solution is mainly used for efficiently cooling the zinc smelting tail gas, so that the elementary substance zinc in the tail gas is rapidly condensed and collected, so that the zinc elementary substance is effectively prevented from being oxidized, and meanwhile, the phenomenon that the condensed zinc liquid is blocked and damaged due to the fact that the condensed zinc liquid isadhered to the tower wall, the pipeline and other equipment can be avoided. The method disclosed by the invention has the advantages that the construction operation cost is low, the operation is simple, and the high-efficiency recovery of elementary substance zinc in the zinc smelting tail gas of the electric furnace can be realized.

Description

technical field [0001] The invention belongs to the technical fields of comprehensive utilization of industrial waste gas and air pollution control, and in particular relates to a method for efficiently recovering elemental zinc in tail gas of electric furnace zinc smelting. Background technique [0002] Zinc is an important non-ferrous metal, which has an irreplaceable position in battery manufacturing, electroplating, medicine and other industries. Zinc smelting processes mainly include wet method and fire method. Electric furnace zinc smelting is to mix zinc oxide material with carbonaceous reducing agent, reduce it to gaseous zinc at high temperature, and then condense and collect the gaseous zinc to obtain zinc products. The tail gas of electric furnace zinc smelting is the tail gas of electric furnace gas after condensation and zinc collection, in which the content of CO is more than 90%, and it contains part of zinc element that is incompletely condensed and zinc reco...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a high-efficiency recovery method for elemental zinc in the tail gas of electric furnace zinc smelting in view of the problems that the recovery efficiency of elemental zinc is low, and the zinc after cooling is easy to adhere to the pipe wall, causing pipeline blockage and equipment damage.