Method for extracting zinc, potassium and sodium by utilizing secondary dusts of rotary hearth furnace

Abstract

The invention relates to a method for extracting zinc, potassium and sodium by utilizing secondary dusts of a rotary hearth furnace. The method comprises the steps that multiple dust containing a zinc element, a potassium element and a sodium element is proportionally burdened and evenly mixed by using or organic binder to obtain a mixture, and the moisture of the mixture is regulated; the mixture is manufactured into carbon-containing pellets; after the carbon-containing pellets are dried and reduced, metalized pellets and the secondary dust are obtained; a leaching operation is conducted on the secondary dust and water, or a washing solution and a crystallizing mother solution, so as to obtain a leaching solution and leaching residue; the leaching solution is purified; the purified leaching solution is extracted to obtain a zinc-loaded organic phase and raffinate; the zinc-loaded organic phase is back extracted to obtain a solution for extracting the zinc element, and the zinc is extracted from the solution; the raffinate is heated to be concentrated and then slowly cooled to the room temperature, and potassium chloride (KCI) crystals occur; the crystallized product is washed by using a saturated KCI solution; the washing solution and the crystallizing mother solution return to be subject to the leaching operation; and when sodium chloride (NaCI) in the leaching solution approximates to a saturation concentration after multiple cycles, the leaching solution is fractionally crystallized to obtain a KCI product and a NaCI product.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of solid waste resources in iron and steel enterprises, in particular to a method for extracting zinc, potassium and sodium from secondary dust of a rotary hearth furnace. Background technique [0002] The main uses and products of zinc include: galvanizing, zinc-manganese batteries, zinc oxide, copper alloys, zinc-based alloys, etc. The zinc structure of zinc products in my country is roughly as follows: about 40% of galvanizing, about 18% of batteries, about 16% of zinc oxide, about 13% of copper alloys, about 12% of zinc-based alloys, and some other sporadic uses account for about 1 %. Zinc ore resources mainly include zinc sulfide ore (sphalerite) and zinc oxide ore (including smithsonite, willemite, hydrozincite, hemimorphite, etc.), and zinc sulfide ore is the main one. Industrial zinc extraction methods include wet method and fire method. In my country, wet method is the main metho...

AI Technical Summary

Problems solved by technology

[0011] In summary, the solid waste utilization methods in the prior art can only recover a certain type of metal elements, and cannot realize the comprehensive recovery and utilization of multiple elements

In addition, the method in the prior art has high cost and is easy to cause environmental pollution

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