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

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...

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

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