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Method for preparing high-purity iron oxide by superconducting high-gradient magnetic separation converter dust removal

A technology of high-gradient magnetic separation and converter dust removal, which is applied in the fields of resources, energy conservation and environmental protection, can solve problems such as difficult to exceed and high operating costs, achieve good results, and achieve large-scale industrial production.

Active Publication Date: 2021-01-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional magnetic separation technology is divided into two types: permanent magnet technology and electromagnetic technology according to the source of the magnetic field: the maximum magnetic field generated by the permanent magnet is small, and the maximum magnetic field generated by the conventional electromagnet with an iron core is limited by the saturation magnetization, which is difficult to exceed; instead of Conventional electromagnets with iron cores require very large electric energy excitation to obtain a large magnetic field, and at the same time use a large amount of cooling water to prevent the winding from melting, and the operating cost is extremely high

Method used

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  • Method for preparing high-purity iron oxide by superconducting high-gradient magnetic separation converter dust removal
  • Method for preparing high-purity iron oxide by superconducting high-gradient magnetic separation converter dust removal
  • Method for preparing high-purity iron oxide by superconducting high-gradient magnetic separation converter dust removal

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Experimental program
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Effect test

Embodiment 1

[0025] Under the conditions of mineral powder particle size -200 mesh, pulp concentration 15g / L, magnetic medium volume filling rate 8%, flow rate 500mL / min, and no dispersant, the iron content of magnetic separation products under different magnetic field intensities was studied.

[0026] Studies have shown that within a certain range, with the increase of magnetic field strength, the iron content of magnetic separation products also increases. When the magnetic field strength is 1.8T, the iron content of the magnetic separation product reaches the maximum value of 64.5%, and the magnetic field strength continues to increase, but the iron content of the magnetic separation product decreases instead, as figure 1 shown.

Embodiment 2

[0028] Under the conditions of mineral powder particle size -200 mesh, pulp concentration 15g / L, magnetic medium volume filling rate 8%, magnetic field strength 1.8T, and flow rate 500mL / min, the magnetic separation product iron under different dispersant sodium hexametaphosphate additions was studied. content.

[0029] Studies have shown that within a certain range, with the increase of the amount of dispersant, the iron content of magnetic separation products also increases. When the concentration of the dispersant used in the experiment was 30mg / L, the iron content of the magnetic separation product reached a maximum of 65.9%, and the concentration of the dispersant continued to increase, but the iron content of the magnetic separation product decreased instead, as figure 2 shown.

Embodiment 3

[0031] Under the conditions of mineral powder particle size -200 mesh, pulp concentration 15g / L, steel wool volume filling rate 8%, magnetic field strength 1.8T, and dispersant dosage 30mg / L, the iron content of magnetic separation products under different pulp flow rates was studied, such as image 3 shown.

[0032] Studies have shown that with the increase of slurry flow rate, the iron content of magnetic separation products has been decreasing.

[0033] The invention aims at the steelmaking converter dust removal ash with an iron content of 30-60%, and uses superconducting high gradient magnetic separation (SHGMS) technology to extract iron oxides, especially the extraction of weak magnetic oxides. The invention is a technological innovation. When the magnetic field strength is 1.2-3.0T, the volume filling rate of the magnetic separation medium is 8-30%, the particle size of the ore powder is -100 mesh (fine grinding is not required), the concentration of the ore pulp is 10...

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Abstract

The invention provides a method for preparing high-purity iron oxide with converter dedusting ash using a superconduction high gradient magnetic separation (HGMS) technology. According to the method, the HGMS technology is used for separating the converter dedusting ash so that the iron oxide can be extracted, then the iron oxide is roasted to prepare high-purity iron oxide red, and cyclic utilization of the converter dedusting ash at the outside of a steel mill can be realized; and moreover, the additional value of the iron oxide red is high, large-scale and high-additional-value resource utilization of waste is achieved, iron elements can be enriched to 65% or above, the number reaches 93% or above when the iron elements are converted into Fe2O3, and the recovery rate of the iron elements reaches 95% or above. The method for preparing the high-purity iron oxide with the converter dedusting ash using the superconduction HGMS technology has ultrahigh separation and extraction capacity and ultralow energy consumption (the energy consumption accounts for 1 / 10-1 / 4 that of a conventional magnetic separation method), the effect is good and energy can be saved obviously; and the method is particularly suitable for enrichment, separation and extraction of the iron elements in iron-containing solid powder such as the converter dedusting ash.

Description

technical field [0001] The invention belongs to the fields of resources, energy saving and environmental protection, and in particular relates to a method for preparing high-purity iron oxides by superconducting high-gradient magnetic separation technology for converter dust removal. Background technique [0002] At present, converter dedusting and ash treatment technologies mainly include returning to sintering, pelletizing as raw material for ironmaking, pressing into agglomerates and returning to converter as coolant and other internal circulation in steel mills. Elements such as K, Na, Zn in dust removal dust will have adverse effects on blast furnace smelting, and elements such as P and S will have adverse effects on steel quality. The recycling of dust in the steel mill is not only not conducive to steel production, but also has low added value. [0003] Magnetic separation technology is a technology that puts substances into a magnetic field for processing. Taking th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03C1/025
CPCB03C1/025
Inventor 李素芹郭子杰杨昌桥孔加伟韩帅帅鲍善词
Owner UNIV OF SCI & TECH BEIJING
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