Biomass-based red mud ecological restoration method and system

Abstract

The invention relates to a biomass-based red mud ecological restoration method and system, belongs to the technical field of red mud ecological restoration, and solves problems of high consumption ofchemical substances for alkaline regulation of red mud, complex other components during red mud soil treatment, high cost and low consumption of the red mud in the prior art. The method comprises steps of step 1, preparing raw materials; step 2, stirring the raw materials, the water and the red mud according to a certain ratio to obtain a mixed raw material; step 3, adding the mixed raw material into a high-pressure reaction kettle for hydrothermal carbonization, and performing solid-liquid separation of a hydrothermal carbonization product obtained by the water to obtain a hydrothermal carbonization solid component and a liquid component; step 4, preparing porous carbon; step 5, fully mixing the porous carbon and the hydrothermal carbonized solid component to prepare a red mud soil matrix; and step 6, carrying out electro-adsorption treatment of the hydrothermal carbonized liquid component, separating out heavy metal ions in the hydrothermal carbonized liquid component, and returningthe water obtained by treatment to the step 3. The method realizes ecological restoration of the red mud.

Description

technical field [0001] The present application relates to red mud ecological restoration technology, in particular to a red mud ecological restoration method and restoration system using biomass. Background technique [0002] Red mud is a solid waste produced during the alumina production process. The total stock of red mud in my country exceeds 600 million tons, and about 100 million tons of red mud are produced every year. A large amount of red mud stockpiles not only occupies land resources, but also causes serious ecological problems near the stockyard. Harm, the strong alkalinity of red mud makes the stockyard barren, and it is easy to generate dust to pollute the air. Harmful elements in red mud are easy to migrate to groundwater and soil to pollute groundwater and soil, and the maintenance of the stockyard requires a certain amount of money. [0003] At present, a lot of research has been carried out on the comprehensive utilization of red mud, mainly including the pre...

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Problems solved by technology

[0002] Red mud is solid waste generated during the alumina production process. The total stock of red mud in my country exceeds 600 million tons, and about 100 million tons of red mud are produced every year. A large amount of red mud stockpiles not only occupies land resources, but also causes serious ecological problems near the stockyard. Hazard, the strong alkalinity of red mud makes the stockyard barren, and it is easy to generate dust to pollute the air. Harmful elements in red mud are easy to migrate to groundwater and soil to pollute groundwater and soil, and the maintenance of the stockyard requires a certain amount of money.

[0003] At present, a lot of research has been carried out on the comprehensive utilization of red mud, mainly including the preparation of functional materials and the preparation of building materials; the preparation of sintered bricks, non-steamed bricks, cement and other building materials from red mud can consume and utilize red mud in large quantities, but the strong alkali of red mud Sexuality seriously affects product quality, while dealkalization technology has high cost and complicated process

[0004] Regulating red mud into a soil matrix for plant growth to achieve ecological restoration, to achieve reduction and harmlessness of red mud, has a very good application prospect; red mud has strong alkalinity and rich mineral elements, and some studies have shown that red mud The use of mud to regulate acidic soil can better promote plant growth, but red mud itself has very poor soil properties, strong alkalinity, low water holding rate, poor air permeability, easy compaction, and low organic nutrient content, so it is difficult to directly use soil

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