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Method for preparing high-iron bauxite pellets

A technology for high iron bauxite and pellets, applied in the field of iron making, can solve problems such as difficulty in forming a cue ball, and achieve the effects of solving the difficulty in forming a cue ball, low pulverization rate, and high compressive strength

Inactive Publication Date: 2017-06-09
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at combining the characteristics of high-iron bauxite, on the basis of the traditional disc granulation process, and aiming at the difficulty of cue ball forming in the high-iron bauxite pelletizing process, a method for preparing high-iron bauxite pellets is proposed. method

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  • Method for preparing high-iron bauxite pellets

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preparation example Construction

[0034] The present invention does not limit the preparation method of the high-iron bauxite oxidized pellets. In other embodiments, other methods may be used to prepare the high-iron bauxite oxidized pellets required for the second-stage pelletizing process.

[0035] The high-iron bauxite particles of the present invention can also be selected from high-iron bauxite metallized pellets or high-iron bauxite raw ore in different technical solutions.

[0036] (2) Preparation of high-iron bauxite pellets

[0037] In the present invention, the high-iron bauxite particles are used as the ball-forming core in the pelletizing process of preparing high-iron bauxite pellets, which can save time in the cue ball forming stage, shorten the pelletizing process, and improve work efficiency. The flow chart of this stage is as follows figure 1 (b) shown.

[0038] Pelletizing: Place the high iron bauxite particles in the disc of the disc granulator. At the same time, the mixed material obtain...

Embodiment 1

[0043] High-iron bauxite from Pingguo, Guangxi was selected, in which TFe content was 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 66%. Add 3wt% of calcium oxide powder, 9.5wt% of graphite powder, and 6wt% of water into the mineral powder, and mix uniformly to obtain a mixed material.

[0044] In the first stage, the inclination angle α of the disk is 54°, and the rotation speed is 20r / min. The drying temperature is 100°C, and the drying time is 2 hours. The calcination temperature is 1200°C, and the calcination time is 1h.

[0045] After the above-mentioned pellets are crushed, high-iron bauxite particles with a particle size of 4-5mm are screened out for the second stage.

[0046] In the second stage, the inclination angle α of the disk is 54°, and the rotation speed is 18r / min. The drying temperature is 100°C, an...

Embodiment 2

[0051] High-iron bauxite from Pingguo, Guangxi was selected, in which TFe content was 22.54wt%, Al 2 o 3 Content is 44.76wt%, SiO 2 The content is 7.32wt%. The percentage of the mass of the ore powder that grinds the high-iron bauxite to a particle size of ≤74 μm is 73% of the total mass of the ore powder. Add 5wt% of calcium oxide powder, 10.5wt% of graphite powder and 8.5wt% of water into the mineral powder, and mix uniformly to obtain a mixed material.

[0052] In the first stage, the inclination angle α of the disk is 57°, and the rotation speed is 18r / min. The drying temperature is 105°C, and the drying time is 2.5 hours. The calcination temperature is 1400°C, and the calcination time is 2h.

[0053] After the above-mentioned pellets are crushed, high-iron bauxite particles with a particle size of 3-4mm are screened out for the second stage.

[0054] In the second stage, the inclination angle α of the disk is 57°, and the rotation speed is 20r / min. The drying tempe...

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Abstract

The invention relates to a method for preparing high-iron bauxite pellets. The method comprises the steps of: ore blending: adding 3-5wt% calcium oxide powder, 9.5-10.5wt% graphite powder, and 6-8.5wt% water to the high-iron bauxite ore powder to obtain a mixed material; pelletizing : Add the mixed material, high-iron bauxite particles, and water into the disc granulator, and perform pelletizing treatment to obtain green pellets; drying: drying the green pellets to obtain dried green pellets; roasting: the drying The post-growth pellets are roasted to obtain pellets. In the method of the present invention, the high-iron bauxite particles within a certain particle size range are selected as the ball-forming core in the pelletizing process of the present invention, which effectively solves the difficulties in cue ball forming and pelletizing time in the pelletizing process of high-iron bauxite. The high-iron bauxite pellets prepared have higher compressive strength and lower pulverization rate, which can meet the requirements of subsequent production.

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] High-iron bauxite refers to bauxite with a mass content of iron oxide greater than 15%. my country is rich in high-iron bauxite resources, and the main types of deposits are sedimentary, accumulation and laterite, mainly distributed in Guangxi, Yunnan, Shanxi and Henan. The high-iron bauxite type is mainly diaspore, and contains a small amount of gibbsite. Moreover, the particle size of the mosaic is relatively fine, and there are many types of minerals, complex components, and the phenomenon of isomorphism exists. The high-iron bauxite powder has a high viscosity, and there is no need to add bentonite, water glass and other organic binders. During the pelletizing process, the cue ball is difficult to form and the shape is often irregular, and the cue ball preparation time needs to be increased. ...

Claims

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Application Information

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