Iron ore concentrate preparation method capable of lowering coercive force of magnetized and roasted ore of refractory iron ore

A technology of magnetization roasting and coercivity, which is applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve the problems of reduced iron recovery rate and insignificant improvement of iron concentrate grade, and achieves high recovery rate and product quality. Stabilize and solve the effect of magnetic agglomeration

Inactive Publication Date: 2016-07-06
NORTHEASTERN UNIV +1
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

In the separation process of the roasted ore after water cooling, in order to improve the concentrate grade, magnetic separation equipment with low field strength and demagnetization treatment can be used. However, these methods do not significantly increase the grade of iron concentrate. and reduced iron recovery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In the embodiment of the present invention, the method for preparing iron concentrate by reducing the coercive force of magnetized roasting ore of refractory iron ore is carried out according to the following steps:

[0019] (1) The sample in this example was taken from Anshan, which is a kind of hematite-containing ore. The ore reduction magnetization roasting product with a temperature of 550°C was placed in a cooler, and cooled to 500°C under a carbon monoxide atmosphere;

[0020] (2) The flow rate of 20m into the reduced magnetization roasted product cooled to 500 ℃ in the cooler 3 / t·h of air, cooled to 100°C, and the material was discharged from the cooler;

[0021] (3) The material was further cooled to room temperature, and the coercive force of the reduced magnetization roasting product was detected to be 5kA / m, which was 50% lower than the coercive force of the reduced magnetization roasting product obtained by water cooling, only 5kA / m;

[0022] (4) Add wate...

Embodiment 2

[0025] In the embodiment of the present invention, the method for preparing iron concentrate by reducing the coercive force of magnetized roasting ore of refractory iron ore is carried out according to the following steps:

[0026] (1) The sample in this example was taken from Anshan, which is a kind of hematite-containing ore. The ore reduction magnetization roasting product with a temperature of 650°C was placed in a cooler and cooled to 400°C under a hydrogen atmosphere;

[0027] (2) The flow rate of 10m into the reduced magnetization roasted product cooled to 400 ℃ in the cooler 3 The mixed gas of nitrogen and oxygen with an oxygen volume concentration of 35% per t·h is cooled to 120°C, and the material is discharged from the cooler;

[0028] (3) The material was further cooled to room temperature, and the coercivity of the reduced magnetization roasting product was detected to be 8kA / m, which was 30% lower than that of the reduced magnetization roasting product obtained b...

Embodiment 3

[0034] In the embodiment of the present invention, the method for preparing iron concentrate by reducing the coercive force of magnetized roasting ore of refractory iron ore is carried out according to the following steps:

[0035] (1) The sample in this example was taken from Anshan, which is a kind of hematite-containing ore. The ore reduction magnetization roasting product with a temperature of 700°C was placed in a cooler, and cooled to 450°C under a neutral oxygen-free atmosphere. ;

[0036] (2) The flow rate of 1m into the reduced magnetization roasted product cooled to 450°C in the cooler 3 / t·h of air, cooled to 50°C, and the material was discharged from the cooler;

[0037] (3) The material was further cooled to room temperature, and the coercivity of the reduced magnetization roasting product was detected to be 10kA / m, which was 90% lower than that of the reduced magnetization roasting product obtained by water cooling, only 2kA / m;

[0038] (4) Add water to the mag...

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Abstract

The invention belongs to the technical field of mineral processing, in particular to a method for preparing iron concentrate by reducing the coercive force of refractory iron ore magnetized roasted ore. The method of the present invention is aimed at the reductive magnetization roasting product of refractory iron ore, cooling to a certain temperature under the condition of reducing atmosphere or neutral oxygen-free atmosphere, controlling the flow rate of air in the cooler, and reducing the coercivity under the condition of ensuring mineral magnetism Grinding-Magnetic Separation-Concentration, to obtain iron concentrate products with high iron grade and high recovery rate, which successfully reduces the coercive force of roasted ore, solves the problem of magnetic agglomeration in the process of magnetic separation, and improves the Sorting index, stable product quality and good economy.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, in particular to a method for preparing iron concentrate by reducing the coercive force of magnetized roasting ore of refractory iron ore. Background technique [0002] Iron ore magnetization roasting-magnetic separation refers to the treatment of iron ore at a certain temperature and corresponding atmospheric conditions to transform the weak magnetic iron minerals in the ore into strong magnetic iron minerals, and then use weak magnetic separation to achieve The separation of strong magnetic iron minerals and gangue minerals to obtain iron concentrates. Magnetic roasting - magnetic separation and then obtaining iron concentrates is an effective method for recovering iron minerals from complex refractory iron ores. [0003] In the process of magnetization roasting of iron ore, hematite is transformed into magnetite in a very short time and high temperature, and the cooling process of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/26B03C1/00
CPCC22B1/26B03C1/00
Inventor 韩跃新刘鹤群李艳军
Owner NORTHEASTERN UNIV
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