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Comprehensive utilization process of red mud and coal gangue under action of short-process mechanical energy

A technology of coal gangue and mechanical energy, applied in the field of materials, can solve the problems of many steps, comprehensive utilization rate less than 20%, insufficient comprehensive utilization rate, etc., and achieve the effect of short process, strong adhesion between particles, and increased specific surface area

Pending Publication Date: 2022-07-29
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the annual discharge of red mud in my country exceeds 100 million tons, which is mainly disposed of by damming and stockpiling, and the comprehensive utilization rate is less than 4%.
At present, coal gangue is mainly used as roadbed filling, and its comprehensive utilization rate is less than 20%.
The patent involves many raw materials and steps, and does not involve the alkalinity of materials

Method used

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  • Comprehensive utilization process of red mud and coal gangue under action of short-process mechanical energy
  • Comprehensive utilization process of red mud and coal gangue under action of short-process mechanical energy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Pour 30kg of red mud, 70kg of coal gangue and 10kg of water glass (30wt.%) additives into a planetary ball mill in turn, perform ball milling at a speed of 100rpm, react under the action of mechanical energy for 1h, and then unload the mixed material, at 70 ℃ The flowing hot air is dried for 12h, and the dry air flow is 1000m 3 / h, that is, to obtain the powder raw materials for the production of full-body bricks, denoted as A.

[0038] In this embodiment, the water in the raw material comes from water glass.

Embodiment 2

[0040] Pour 40kg of red mud, 60kg of coal gangue, and 10kg of water glass (30wt.%) additives into a planetary ball mill successively, carry out ball milling at a rotational speed of 100 rpm, and react under mechanical energy for 30 minutes, and then unload the mixed material. ℃ of flowing hot air for drying treatment for 12h, of which the dry air flow rate is 100m 3 / h, that is, to obtain the powder raw materials for the production of full-body bricks, denoted as B.

[0041] In this embodiment, the water in the raw material comes from water glass.

Embodiment 3

[0043]Pour 40kg of red mud, 60kg of coal gangue, 8kg of water glass (30wt.%), and 2kg of calcium sulfate additive into a planetary ball mill successively, and perform ball milling at a rotational speed of 100rpm, react under the action of mechanical energy for 30 minutes, and then unload the mixture. out, and dry at 70°C with flowing hot air for 12h, wherein the dry air flow is 2000m 3 / h, that is, to obtain the powder raw material for the production of full-body bricks, denoted as C.

[0044] In this embodiment, the water in the raw material comes from water glass.

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Abstract

The invention discloses a comprehensive utilization process of red mud and coal gangue under the action of short-process mechanical energy. The comprehensive utilization process comprises the following steps: step 1, adding the red mud, the coal gangue, an additive and water into a planetary ball mill for mixing and mechanical grinding reaction; and step 2, after the reaction is finished, discharging the mixed material out of the ball mill, transferring the mixed material into a tunnel dryer, and carrying out drying treatment in a flowing hot air atmosphere to obtain the powder raw material for preparing the general brick. According to the invention, high-energy mechanical energy generated in the mechanical ball milling process is utilized to promote chemical reaction of the additive, the red mud and the coal gangue, consume alkaline OH-hydroxyl compounds therein, strengthen dehydration of red mud crystal water and OH-hydroxyl compounds, change the occurrence form of alkali metal Na < + > ions and reduce the alkalinity of the red mud; red mud and coal gangue particles are impacted to be crushed and refined under the stress effect, the specific surface area of the material is increased, meanwhile, the crystal structure and physicochemical properties of the material are also changed, and the product performance is improved.

Description

technical field [0001] The invention belongs to the technical field of materials, and particularly relates to a comprehensive utilization process of red mud and coal gangue. Background technique [0002] Red mud is a kind of strong alkaline solid waste discharged in the alumina production process. The chemical composition of red mud discharged in the process of refining alumina in bauxite by different processes is basically the same, mainly including alumina, iron oxide, and carbon dioxide. Oxides such as silicon, titanium dioxide, sodium oxide, calcium oxide, etc., but due to different ore properties and production processes, the content of each substance in red mud is different. At present, the annual discharge of red mud in my country exceeds 100 million tons, which is mainly disposed of in the form of dam storage, and the comprehensive utilization rate is less than 4%. Red mud storage occupies site resources and has high management and maintenance costs, and red mud con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/132C04B33/13
CPCC04B33/1324C04B33/1322C04B33/131C04B33/1328C04B2235/448C04B2235/3427
Inventor 冯锐冯秀娟
Owner CHINA UNIV OF MINING & TECH
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