Red mud soil substrate and preparation method thereof

Abstract

The present application discloses a red mud soil substrate and a preparation method thereof, belongs to the technical field of red mud ecological restoration, and solves the problem of a large dosageof a current red mud alkaline adjustment chemical substance and complicated other components, high costs and a small consumption amount of red mud during red mud soil treatment. The preparation methodincludes the following steps: crushing biomass raw materials; conveying the biomass powder, water and a catalyst into a stirring tank, and performing stirring to obtain a mixture; adding the mixtureto a high-pressure reaction kettle, performing heating, performing heat preservation, and performing cooling to room temperature to obtain hydrothermal carbonization products; performing solid-liquidseparation on a part of the hydrothermal carbonization products to obtain hydrothermal carbon and a hydrothermal carbon liquid; leaving the remaining hydrothermal carbonization product for standby application; performing carbonization on the hydrothermal carbon to obtain modified hydrothermal carbon; and mixing the modified hydrothermal carbon, the hydrothermal carbonization product and the red mud, putting the mixture into a stirring tank, performing stirring, and performing standing to obtain the red mud soil substrate. The red mud soil substrate includes the stir mixture of the modified hydrothermal carbon, the hydrothermal carbonization product and the red mud. The substrate and method provided by the present application realize 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 soil matrix and a preparation method thereof. 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. At present, a lot of research has been carried out on the comprehensive utilization of red mud, mainly including the extraction of valuable components,...

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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.

At present, a lot of research has been carried out on the comprehensive utilization of red mud, mainly including the extraction of valuable components, the preparation of functional materials, the preparation of building materials, etc.; red mud contains a certain amount of metal resources, and the extraction of valuable metals has complex processes, high costs, and secondary Secondary pollution and other issues; the preparation of high value-added functional materials is basically in the research stage, and the consumption of red mud is very limited for this technical idea; building materials such as sintered bricks, non-steamed bricks, and cement can be consumed and utilized in large quantities from red mud Red mud, but the strong alkalinity of red mud seriously affects the product quality, and the dealkalization technology has high cost and complicated process

[0003] 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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