Method for treating hematite deironing tail gas

Abstract

The invention discloses a method for treating hematite deironing tail gas, which comprises the following steps: contacting the hematite deironing tail gas with washing liquid to obtain first washed gas and washed liquid containing solid particles, and washing the first washed gas to obtain second washed gas, and performing gas-liquid separation on the second washed gas to obtain separated gas and separated liquid, settling the washed liquid containing the solid particles to obtain supernatant and underflow, cooling the supernatant to obtain cooled liquid, and circulating the cooled liquid as a washing liquid. The hematite deironing tail gas is treated by adopting the method, solid particles in tail gas washing liquid can be discharged out of a washing system, and the solid content of the hematite deironing tail gas washing system is reduced, so that the tail gas washing effect is improved, the washing efficiency is improved, and stable operation of the system is facilitated.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for treating hematite iron removal tail gas. Background technique [0002] In the zinc hydrometallurgy process, iron removal methods mainly include jarosite method, goethite method and hematite method. Using hematite method to remove iron has the advantages of high leaching rate of zinc and associated metals, good comprehensive recovery, and high yield. Less amount of slag, good filterability of slag, high iron content in slag (Fe≥56%) and other advantages; while iron removal by hematite method will produce a large amount of exhaust gas entrained with solid particles, which needs to be purified. In the traditional tail gas scrubbing method, the direction of liquid and solid is reaction kettle, flash tank exhaust → exhaust scrubber → washing liquid storage tank → 1# cooling water storage tank → cooling fan → 2# cooling water storage tank → exhaust steam scrubber , w...

AI Technical Summary

Problems solved by technology

In the traditional tail gas scrubbing method, the direction of liquid and solid is reaction kettle, flash tank exhaust → exhaust scrubber → washing liquid storage tank → 1# cooling water storage tank → cooling fan → 2# cooling water storage tank → exhaust steam scrubber , with this cycle, the disadvantage of this traditional washing method is that the solid particles in the washing liquid cannot be discharged from the washing system, resulting in higher and higher solids in the washing liquid, poor cleaning effect of the tail gas, large amount of new water, and serious slag accumulation in the tail gas washing system. Reduce the start-up rate, which is not conducive to the control of the volume balance of the wet system and affects the production operation

[0003] Therefore, the washing method of the existing hematite iron removal tail gas needs to be improved

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