Method and system for preparing red mud pellets

A technology for red mud pellets and red mud, which is applied in the field of preparing red mud pellets, can solve the problems of high surface viscosity of the cue ball, increased capillary resistance, and low production rate of pelletizing, and achieves high porosity and easy pelletizing. , the effect of improving the ball-forming rate and ball-making efficiency

Active Publication Date: 2016-11-23
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Red mud is the solid waste residue after bauxite alkali dissolution. The particles are very small. After screening, the 0.043mm particle size accounts for more than 90%. The capillary diameter is too small, the resistance of the capillary becomes larger, and the migration speed of capillary water in the red mud material The growth rate of the green pellets is very slow, and the surface of the cue ball is highly viscous, easy to stick, and the pelletizing productivity is low

Method used

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  • Method and system for preparing red mud pellets
  • Method and system for preparing red mud pellets
  • Method and system for preparing red mud pellets

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Experimental program
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Effect test

Embodiment 1

[0057] Utilizing the method of the present invention, red mud pellets are prepared with red mud and calcium oxalate as raw materials, and the specific steps are as follows:

[0058] (1) Add 100 parts of red mud with water content of 35% and 5 parts of calcium oxalate into the drying cylinder at the same time. The temperature of the inlet in the drying cylinder is 400°C, the temperature of the material at the outlet is 550°C, and the drying time is 15 minutes. Finally, the moisture content of the mixed material is 12%.

[0059] (2) Add 15% reduced coal and 0.5% bentonite to the mixed material obtained in step (1) for wet mixing treatment to obtain wet mixed material.

[0060] (3) Transport the wet mixed material into the hopper of the disc pelletizer for disc granulation. The granulation time of the same batch of pellets is about 35 minutes, and the disc rotation speed is 19r / min. The primary pelleting rate of pelletizing is 50%, and the particle size range of the pellets is 6...

Embodiment 2

[0062] Utilizing the method of the present invention, red mud pellets are prepared with red mud and calcium oxalate as raw materials, and the specific steps are as follows:

[0063] (1) Add 100 parts of red mud with water content of 35% and 5 parts of calcium oxalate into the drying cylinder at the same time. The temperature of the inlet in the drying cylinder is 600°C, the temperature of the material at the outlet is 650°C, and the drying time is 20min Finally, the moisture content of the mixed material is 0.5%, and the specific surface area of ​​the material is 12m 2 / g.

[0064] (2) Add 19% reduced coal and 1% bentonite to the mixed material obtained in step (1) for wet mixing treatment to obtain wet mixed material.

[0065] (3) Transport the wet mixed material into the hopper of the disc pelletizer for disc granulation. The granulation time of the same batch of pellets is about 15 minutes, and the disc rotation speed is 14r / min. The primary pelleting rate of pelletizing ...

Embodiment 3

[0067] Utilizing the method of the present invention, red mud pellets are prepared with red mud and calcium oxalate as raw materials, and the specific steps are as follows:

[0068] (1) Add 100 parts of red mud with water content of 35% and 5 parts of calcium oxalate into the drying cylinder at the same time. The temperature of the inlet in the drying cylinder is 600°C, the temperature of the material at the outlet is 650°C, and the drying time is 20min Finally, the moisture content of the mixed material is 0.5%, and the specific surface area of ​​the material is 12m 2 / g.

[0069] (2) Add 19% reduced coal and 1% bentonite to the mixed material obtained in step (1) for wet mixing treatment to obtain wet mixed material.

[0070] (3) Transport the wet mixed material into the hopper of the disc pelletizer for disc granulation. The granulation time of the same batch of pellets is about 15 minutes, and the rotation speed of the disc is 17r / min. The primary pelleting rate of pelle...

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Abstract

The invention discloses a method and a system for preparing red mud pellets. The method for preparing the red mud pellets comprises the following steps: drying red mud and calcium oxalate so as to obtain dried material and flue gas; performing wet-mixing treatment on the dried material with a reducing agent and a binder so as to obtain wet-mixed material; and carrying out pellet making treatment on the wet-mixed material so as to obtain the red mud pellets. The calcium oxalate is added into the red mud and then dried, the calcium oxalate is dried and heated to decompose to generate CO gas and CaCO3, wherein CO gas can destroy the stable pore passages in the red mud, so that the pore diameter is increased and the surface area is reduced; meanwhile, the capillary water in the red mud pores is reduced, and furthermore pelletizing is facilitated; moreover, the prepared pellet is large in porosity, and the pelletizing rate and the pelletizing efficiency are remarkably improved; CaCO3 obtained by decomposition of the calcium oxalate can be used as a reducing agent in a pellet reduction process, and the addition of the calcium-based reducing agent in the reduction process is omitted.

Description

technical field [0001] The present invention relates to a method for preparing red mud pellets and a system for preparing red mud pellets. Background technique [0002] Red mud is the most important solid waste generated in the production process of alumina industry. At present, the annual discharge of red mud in China exceeds 30 million tons. Except for a small part used in cement production and brick making, most of them are wet open-air dams Stockpiling, the cumulative stockpiling of red mud has exceeded 350 million tons. Red mud contains a variety of metal elements and rare elements. It is very necessary to develop and utilize rationally. Among them, the iron content in Bayer process red mud is as high as 40%. The comprehensive utilization of iron metallurgical solid waste resources has attracted the attention of academia and business circles. Due to the low particle size of red mud, in order to meet the needs of further smelting, the powder needs to be shaped before it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/242C22B7/04
CPCC22B1/242C22B7/04Y02P10/20
Inventor 古明远曹志成薛逊王敏吴佩佩吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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