A method for efficiently decomposing zinc ferrite in metallurgical waste slag

A technology of metallurgical waste slag and zinc ferrite, applied in the direction of improving process efficiency, etc., can solve the problem of low decomposition rate, achieve high decomposition rate, controllable zinc and iron phase, and improve the decomposition rate

Active Publication Date: 2017-03-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if sulfuric acid, sodium salt, iron sulfate, and ammonium sulfate are roasted and decomposed, the decomposition rate of zinc ferrite is lower than 90%; when carbon monoxide is used to decompose zinc ferrite, it is easy to overreduce to form a zinc-iron solid solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The goethite slag is ground to -200 mesh (74um), which accounts for more than 90%. The content of Zn and Fe in the goethite slag is 9.56% and 35.42%, respectively. Add reduced iron powder, the amount of reduced iron powder added is 0.5 times the mass of goethite slag. Add mixed gas, the gas composes SO 2 / (SO 2 +O 2 ) Is 8%, roasted at 600°C for 90 minutes, after roasting, the roasting slag is taken out and cooled, and the decomposition rate of zinc ferrite is determined to be 95.34%.

Embodiment 2

[0024] The acid leaching residue is ground to -200 mesh (74um), accounting for more than 90%, and the content of Zn and Fe in the acid leaching residue are 17.25% and 22.49%, respectively. When pyrite is added, the amount of pyrite added is 0.2 times the mass of the acid leaching residue. Add mixed gas, the gas composes SO 2 / (SO 2 +O 2 ) Is 60%, calcined at 450°C for 90 minutes, and then the calcined slag is taken out and cooled, and the decomposition rate of zinc ferrite is determined to be 99.06%.

Embodiment 3

[0026] The intermediate leaching slag is ground down to -200 mesh (74um) accounting for more than 90%, and the contents of Zn and Fe in the intermediate leaching slag are 21.45% and 23.75%, respectively. Ferric oxide is added, and the amount of ferric oxide added is 0.5 times the mass of the intermediate leaching slag. Add mixed gas, the gas composes SO 2 / (SO 2 +O 2 ) Is 70% and roasted at 1100°C for 30 minutes. After roasting, the roasting slag is taken out and cooled, and the decomposition rate of zinc ferrite is determined to be 98.02%.

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Abstract

The invention discloses a method for efficiently decomposing zinc ferrite in metallurgical waste slag. The method is characterized in that under the synergistic effect of sulfur dioxide and an iron-based reagent, the zinc-ferrite type waste slag can be decomposed in the temperature range of 200-1100 DEG C, the decomposition rate of the zinc ferrite reaches 99%, and after the zinc ferrite is decomposed, the zinc-iron phase can be regulated and controlled according to the requirement of the following process to recover zinc and iron in the zinc-ferrite type metallurgical waste slag. The method provided by the invention is effectively used for reducing the zinc-ferrite type metallurgical waste and recovering zinc-iron resources.

Description

[0001] Technical field: [0002] The invention belongs to the cross-field of metallurgical engineering and environmental engineering, and relates to a method for efficiently decomposing zinc ferrite in metallurgical waste slag, in particular to a roasting and decomposing zinc ferrite in metallurgical slag such as zinc leaching slag, electric arc furnace fume, and oxygen top blowing converter sludge. Methods. [0003] Background technique: [0004] Zinc and iron inevitably produce zinc ferrite under high temperature conditions. The metallurgical waste slag containing zinc ferrite includes acid leaching slag, intermediate leaching slag, and iron vitriol slag produced by the hydro-zinc smelting process, electric arc furnace dust produced by the iron smelting process, and oxygen top-blown converter sludge produced during the steelmaking process. Because zinc ferrite has stable properties and is difficult to decompose by conventional methods, zinc ferrite metallurgical waste slag is curr...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C22B7/04C22B19/30
CPCY02P10/20
Inventor刘恢彭兵李燕春柴立元袁莹珍闵小波彭宁雷杰
OwnerCENT SOUTH UNIV