METHOD FOR EXTRACTING ZINC AND ENRICHING IRON IN COOPERATION WITH CONSUMPTION OF CO2 BY MEANS OF HOT ALKALI DISSOLUTION OF METALLURGICAL DUST

WIPO Patent Application WO/2024/032804

A1

The present invention belongs to the technical field of solid waste resource utilization, and provides a method for extracting zinc and enriching iron in cooperation with the consumption of CO2 by means of the hot alkali dissolution of metallurgical dust. In the present invention, metallurgical dust and an alkali liquor are mixed and then subjected to a dissolved-out reaction, and reaction products are filtered to obtain an iron-rich powder and a dissolved-out solution; the iron-rich powder is subjected to secondary washing by using production circulating water to obtain a fine iron powder, the dissolved-out solution is diluted with a washing solution, and the diluted solution is subjected to settling separation to obtain a sodium salt dissolved-out solution and sediment impurities; and the precipitated impurities are subjected to solid-liquid separation to obtain a dissolved-out solution and impurities, a flue gas is introduced into the dissolved-out solution, and CO2 in the flue gas reacts with the dissolved-out solution. The method of the present invention has relatively mild reaction conditions and a high impurity removal efficiency, and recycles a high-concentration alkali medium, such that the production cost is reduced; and the present invention can not only greatly improve the iron-rich grade of same, but can achieve resource utilization of elements such as silicon, aluminum, zinc in the metallurgical dust, and can also effectively consume the CO2 generated by iron and steel enterprises.

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WO/2022/262971	PROCESS AND PLANT FOR RECYCLING ZINC OXIDE RESIDUES

KANG YUE (CN)
SUN RUIJING (CN)
LIU CHAO (CN)
ZHANG YUZHU (CN)
XING HONGWEI (CN)
XUE GUIJUN (CN)
WANG FENG (CN)

PCT/CN2023/112842

February 15, 2024

August 14, 2023

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UNIV NORTH CHINA SCIENCE & TECHNOLOGY (CN)

C22B7/02; B01D53/78; C22B19/20; C22B21/00

CN115537568A	2022-12-30
JPH06100955A	1994-04-12
US4606765A	1986-08-19
US20150307400A1	2015-10-29
FR2510141A1	1983-01-28
US6500229B1	2002-12-31

BEIJING FINELAND IP FIRM (CN)

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