Red mud modification method

Abstract

The invention relates to the technical field of industrial waste residue modification, and discloses a red mud modification method. The red mud modification method comprises the following steps that (1), a red mud modifier is provided, and the red mud modifier is prepared from acidic organic residues, gypsum and mushroom compost; and (2), the red mud is uniformly mixed with the red mud modifier, standing and aging are carried out. The modified red mud has good structural stability, and the volume weight of the red mud can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of modification of industrial waste residues, in particular to a red mud modification method. Background technique [0002] Red mud is an insoluble waste residue obtained by extracting alumina from bauxite using the Bayer process. Every ton of alumina produced will produce 1-25 tons of red mud. [0003] At present, there are two ways to deal with red mud: stacking and recycling. Among them, there are three main directions of recycling: preparation of building materials, extraction of valuable metal elements in red mud, and application of them in environmental governance. Using red mud as raw material to prepare building materials can reduce the preparation cost, but due to the high salt content in red mud, salts will be precipitated, resulting in "frost" phenomenon, which will not only affect the aesthetics of buildings, but also precipitated salts in After being washed by rainwater, it will flow into the...

AI Technical Summary

Problems solved by technology

Using red mud as raw material to prepare building materials can reduce the preparation cost, but due to the high salt content in red mud, salts will be precipitated, resulting in "frost" phenomenon, which will not only affect the aesthetics of buildings, but also precipitated salts in After being washed by rainwater, it will flow into the surrounding soil or water body with the rainwater, which will have an adverse impact on the surrounding environment

Valuable metal elements are recovered from red mud, and the recovery rate and leaching rate of organic metals are relatively high. However, due to the complicated extraction process, the extraction of rare metals in red mud is basically done by acid leaching, which is easy to corrode equipment. The consumption of acid is large and the cost is high

[0004] Stacking of red mud, due to its strong alkalinity, high salinity, lack of organic matter and nutrients required by various plants, and high metal toxicity, will affect the soil where the red mud is piled up, so it is not suitable for planting seedlings or sowing in the later stage

The steps of the current red mud improvement method are relatively complicated, and the stability of the modified red mud is not very good, and the bulk density of the modified red mud is still relatively high, which is not conducive to the planting of later vegetation and sustainable development. ecological improvement

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