Method for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings

A technology for magnetic separation of steel slag and calcium ferrite, applied in magnetic separation, chemical instruments and methods, solid separation, etc., can solve problems such as inability to further produce and separate calcium ferrite and magnesium ferrite products

Pending Publication Date: 2020-06-16
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] It can be seen that the existing steel slag RO phase chemical treatment-separation process can only improve the separation efficiency of magnetic separation through phase transformation, and cannot further produce and separate higher-quality calcium ferrite and magnesium ferrite products

Method used

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  • Method for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] Comprehensive steel slag magnetic separation tailings of a steel plant in Hubei Province, the main components (multiple test range values) are: TFe26.22% ~ 27.61%, CaO 37.10% ~ 38.98%, MgO 7.50% ~ 8.22%, Al 2 o 3 4.23%~5.24%, SiO 2 11.59%~14.20%, SO 3 0.16% to 0.27%.

[0026] Use process:

[0027] (1) Selective dissociation of coarse elemental iron. Take 5kg of raw material steel slag magnetic separation tailings, first use a jaw crusher to crush the raw steel slag magnetic separation tailings to 9.8mm-11.2mm (the average value of multiple measurements, the same below), and selectively dissociate coarse-grained elemental iron particles .

[0028] (2) Separation of coarse grained elemental iron. Under the field strength of 795Gs~810Gs (the average value of multiple measurements, the same below), the dry powder magnetic separator is used for magnetic separation, and the coarse-grained elemental iron is removed in the form of magnetic separation concentrate, which ...

example 2

[0033] Comprehensive steel slag magnetic separation tailings of a steel plant in Hebei Province, the main components are: TFe 22.14% ~ 22.37%, CaO 36.15% ~ 37.03%, MgO 8.77% ~ 9.09%, Al 2 o 3 2.22%~2.38%, SiO 2 16.35%~16.41%, SO 3 0.21% to 0.32%.

[0034] Use process:

[0035] (1) Selective dissociation of coarse elemental iron. Take 20kg of raw material steel slag magnetic separation tailings, first use a jaw crusher to crush the raw steel slag magnetic separation tailings to 12.82mm-12.96mm, and selectively dissociate coarse-grained elemental iron particles.

[0036] (2) Separation of coarse grained elemental iron. Under the field strength of 540Gs ~ 552Gs, the dry powder magnetic separator is used for magnetic separation, and the coarse elemental iron is removed in the form of magnetic separation concentrate. The latter contains 68.27% ~ 68.76% iron and is used as a raw material for steelmaking.

[0037] (3) Selective dissociation of calcium ferrite and magnesium f...

example 3

[0041] Comprehensive steel slag magnetic separation tailings from a steel plant in Liaoning Province, the main components are: TFe 27.31%-27.93%, CaO 31.35%-31.08%, MgO 9.77%-9.89%, Al 2 o 3 1.93%~2.16%, SiO 2 16.82%~16.97%, SO 3 0.30% to 0.31%.

[0042] Use process:

[0043] (1) Selective dissociation of coarse elemental iron. Take 10kg of raw material steel slag magnetic separation tailings, first use a jaw crusher to crush the raw steel slag magnetic separation tailings to 12.91mm-13.77mm, and selectively dissociate coarse-grained elemental iron particles.

[0044] (2) Separation of coarse grained elemental iron. Under the field strength of 1139Gs ~ 1157Gs, the dry powder magnetic separator is used for magnetic separation, and the coarse elemental iron is removed in the form of magnetic separation concentrate. The latter contains 70.05% to 70.23% iron and is used as a raw material for steelmaking.

[0045] (3) Selective dissociation of calcium ferrite and magnesium...

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Abstract

The invention belongs to the field of resource regeneration, and particularly relates to a method for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings. Themethod comprises the following steps: firstly, crushing the steel slag magnetic separation tailings containing 20%-30% of iron to 10mm-13mm by using selective crushing equipment, and selectively dissociating coarse-grained elemental iron particles; secondly, conducting magnetic separation under the field intensity of 300 Gs-1500 Gs, removing coarse-grained elemental iron in the form of magnetic concentrate and using the coarse-grained elemental iron as a steelmaking raw material; thirdly, finely crushing the magnetic separation tailings to 0.5mm-3.5mm by using roller type crushing equipment,and selectively dissociating calcium ferrite and magnesium ferrite by using hardness difference; and fourthly, carrying out magnetic separation under the field intensity of 500 Gs-3200 Gs, separatingout fine-grained elemental iron and merging the fine-grained elemental iron into the steelmaking raw material, and purifying residual calcium ferrite and magnesium ferrite crude products through a vibration bed eddy current sorting machine, thus obtaining a final product. The tailings without specific purposes generated in the process are merged for producing a cementing material, and finally all-component resource utilization of the steel slag is achieved.

Description

technical field [0001] The invention belongs to the field of renewable resources and relates to a method for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings. Background technique [0002] The production process of calcium ferrite and magnesium ferrite is complex and requires high quality of raw materials, so they are widely used in chemical industry and electronic industry. At the same time, my country's steel slag stockpile and output are huge, but the comprehensive utilization rate is only about 17%. It not only affects steel production, but also easily causes surrounding environmental pollution. Calcium ferrite and magnesium ferrite are important components of RO phase in steel slag, which are inert components. Fine separation of calcium ferrite and magnesium ferrite from steel slag has practical application value. [0003] Chinese invention patent CN107721211A discloses a high-efficiency separation and recovery method of R...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00B02C21/00B02C23/14B03C1/30C04B7/147
CPCB02C21/00B02C23/14B03C1/30C01G49/00C04B7/147Y02P40/10
Inventor 胡文韬倪文郭九传刘欣伟
Owner UNIV OF SCI & TECH BEIJING
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