Method for preparing high-iron bauxite pellets

A technology of high-iron bauxite and pellets, which is applied in the field of ironmaking, can solve the problems of high-iron bauxite being difficult to form pellets, low sample strength, and rough surface of pellets, so as to achieve large-scale industrial application and high compressive strength Large, Smooth Surface Effects

Active Publication Date: 2017-05-10
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0008] For high-iron bauxite, if the roller pressing ball or extrusion column process is adopted, after adding 6-8.5wt% water, the prepared sample has low strength and severe pulverization, which is not conducive to the roasting and magnetic separation process.
Using the traditional disc pelletizing process, the high-iron bauxite is not easy to pellet, the surface of the pellets is rough, and the pulverization rate exceeds 15%.

Method used

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  • Method for preparing high-iron bauxite pellets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The high-iron bauxite in the A area is selected, wherein the TFe content is 22.54wt%, Al 2 o 3 Content is 44.76wt%, SiO 2 The content is 7.32wt%. The mass percentage of the mass of the high-iron bauxite ground to a particle size of ≤74 μm to the total mass of the ore powder is 67%. Add 3.5wt% calcium hydroxide powder and 5wt% sodium hydroxide powder to the mineral powder, and mix uniformly to obtain a mixed material.

[0055] Get 5wt% mixed material, add in the disc of disc granulator in the mode of continuous feeding. Adjust the inclination angle α of the disk to 44° and the rotation speed to 15r / min. The mix and water were added to the disc every 3 minutes. When the average particle size of the cue ball is greater than 2 mm, stop adding the mixed material to the disc, and only add water.

[0056] Screen out the cue balls with a particle size of 2-5 mm, and keep the cue balls with a particle size > 5 mm. In this embodiment, cue balls with a particle size of 2-5 ...

Embodiment 2

[0060] Select the high-iron bauxite in B area, wherein the TFe content is 22.34wt%, Al 2 o 3 Content is 43.19wt%, SiO 2 The content is 4.92wt%. The mass of the high iron bauxite ground to a particle size of ≤74 μm accounts for 71% of the total mass of the ore powder. Add 5wt% calcium hydroxide powder and 5.5wt% sodium hydroxide powder to the mineral powder, and mix uniformly to obtain a mixed material.

[0061] Get 5wt% mixed material, add in the disc of disc granulator in the mode of continuous feeding. Adjust the inclination angle α of the disc to 45°, and the rotation speed to 16r / min. The mixture and water were added to the disc every 3 minutes. When the average particle size of the cue ball is greater than 2 mm, stop adding the mixed material to the disc, and only add water.

[0062] Screen out the cue balls with a particle size of 2-5 mm, and keep the cue balls with a particle size > 5 mm. In this embodiment, cue balls with a particle size of 2-5 mm account for ≥9...

Embodiment 3

[0066] Select the high-iron bauxite in C area, wherein TFe content is 23.15wt%, Al 2 o 3 Content is 43.88wt%, SiO 2 The content is 5.13wt%. The mass of the high-iron bauxite ground to a particle size of ≤74 μm accounts for 75% of the total mass of the ore powder. Add 3wt% calcium hydroxide powder and 4.5wt% sodium hydroxide powder to the mineral powder, and mix uniformly to obtain a mixed material.

[0067] Get 5wt% mixed material, add in the disc of disc granulator in the mode of continuous feeding. Adjust the inclination angle α of the disk to 46° and the rotation speed to 17r / min. The mixture and water were added to the disc every 3 minutes. When the average particle size of the cue ball is greater than 2 mm, stop adding the mixed material to the disc, and only add water.

[0068] Screen out the cue balls with a particle size of 2-5 mm, and keep the cue balls with a particle size > 5 mm. In this embodiment, cue balls with a particle size of 2-5 mm account for ≥95% of...

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Abstract

The invention relates to a method for preparing high-iron bauxite pellets. The method comprises the steps that bauxite is grinded, specifically, the high-iron bauxite is grinded to obtain bauxite powder; blending is carried out, specifically, 3-5 wt% of calcium hydroxide powder and 4.5-5.5 wt% of sodium hydroxide powder are added to the bauxite powder, and a mixed material is obtained; pelleting is carried out, specifically, the mixed material is added to a disc pelletizer, water is added to the mixed material, fresh pellets can be obtained through pelleting, the pelleting process sequentially comprises the three stages of formation of master pellets, growth of the master pellets and formation of the fresh pellets, and the inclination angle alpha of a disc of the disc pelletizer is 44-46 degrees, 48-52 degrees and 56-60 degrees in the stage of formation of the master pellets, the stage of growth of the master pellets and the stage of formation of the fresh pellets correspondingly; drying is carried out, specifically, the dried fresh pellets are obtained after drying; and calcination is carried out, specifically, the pellets are obtained by calcinating the dried fresh pellets. According to the method, the pelleting process is carried out by stages, the obtained fresh pellets are smooth in surface and compact inside, pulverization is avoided, and the high-iron bauxite pellets have high compressive strength and can be applied industrially on a large scale.

Description

technical field [0001] The invention relates to the technical field of ironmaking, in particular to a method for preparing high-iron bauxite pellets. Background technique [0002] As the main raw material for the preparation of alumina and refractory materials, bauxite is the most important mineral resource in my country. my country's bauxite reserves are about 2.2 billion tons, ranking seventh in the world. In recent years, with the increasing demand for alumina products and refractory materials, the demand for bauxite resources has been increasing year by year, and the quality requirements are also getting higher and higher. With the sharp reduction of high-quality bauxite resources, the utilization of poor, fine and miscellaneous bauxite resources has been paid more attention. Bauxite with iron oxide content greater than 15% is high-iron bauxite. Among them, the alumina content is relatively low, and the silicon oxide content is relatively high. [0003] According to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C22B1/02
CPCC22B1/02C22B1/2406
Inventor 孙辉边妙莲马冬阳陈士朝薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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