Improvement method of aluminum tailings slag based on ion exchange and crosslinking reaction

Abstract

The invention discloses a method for improving aluminum tailings slag based on ion exchange and cross-linking reaction, and belongs to the field of soil regulating materials or soil stabilizing materials. Aiming at the technical problems of insufficient aluminum tailings slag strength and serious alkali pollution, the invention proposes an aluminum tailings slag modifier and improvement steps. Aluminum tailings slag modifiers include alkali-reducing curing agents, ion-exchange stabilizers and particle-linking curing agents. The improvement step of aluminum tailings slag is the step of how to quantitatively use aluminum tailings slag improver. The invention promotes the consolidation of the aluminum tailings slag, improves the compactness of the aluminum tailings slag, makes the aluminum tailings slag a stable and continuous solid, and significantly improves the strength of the aluminum tailings slag. Moreover, the alkalinity of the aluminum tailings slag is reduced, and the pollution to the environment is reduced.

Description

technical field [0001] The invention relates to the field of soil regulating materials or soil stabilizing materials, in particular to a method for improving aluminum tailings slag based on ion exchange and cross-linking reactions. Background technique [0002] While the aluminum industry is rich in aluminum, it is accompanied by a large amount of aluminum tailings slag output. Aluminum tailings slag or red mud slag. Aluminum tailings slag is generally regarded as mining solid waste, which is piled up in tailings ponds or low-lying places after simple treatment or no treatment. This will occupy land, destroy vegetation, block water bodies, pollute surrounding air, soil, water sources, and endanger human health. Unreasonable accumulation of tailings can easily lead to safety problems, such as tailings pond dam failure and landslide accidents. For the sake of public safety, saving resources, and protecting the environment, aluminum tailings slag can be used after treatment,...

AI Technical Summary

Problems solved by technology

[0004] (1) The particles are mainly powder particles, the internal friction angle and cohesion are very small, so the stiffness and strength are very low, and it is easy to liquefy in the saturated state

(2) As a fine-grained soil material, the specific surface area is large. If cementitious material is used for consolidation, the amount of cementitious material required is large, so the curing cost is high

(3) It is highly alkaline, and the alkali ions in it will not only significantly reduce the curing strength and durability, but also pollute the environment

(4) The hydration activity of silicon, aluminum and iron oxides is low, and it is difficult to form stable cement stone

The content of solid curing agent is large, and it is difficult to fully mix evenly in actual engineering

[0022] In summary, the current improvement technologies for aluminum tailings slag are mainly based on the principle of hydration reaction, ion exchange or polymer cross-linking, but none of them fully deal with the technical problems caused by the above-mentioned characteristics of aluminum tailings slag, and there are also some technical details that are not fully disclosed. defect

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