Improvement method of soil phosphorus status based on reuse of red mud-based composite solid waste materials

Abstract

The invention provides a method for improving soil phosphorus status based on red mud-based composite solid waste material reuse, comprising the following steps: Step 1: mixing red mud with fly ash, cement and water, and granulating, and calcining the obtained particles. Microwave activation treatment to obtain red mud-based composite solid waste materials; Step 2: Apply red mud-based composite solid waste materials to phosphorus-containing wastewater adsorption; Step 3: Add red mud-based composite solid waste materials to acid In phosphorus-deficient soils, it is used for phosphorus-deficient soil phosphorus compensation and alkaline soil improvement. The invention adopts a calcination-microwave combined activation method to activate the red mud-based composite solid waste material, applies it to the adsorption of inorganic element phosphorus in sewage, and applies the adsorbed material to acidic phosphorus-deficient soil areas. Compared with the traditional red mud environmental protection material, the activation method of the invention is more environmentally friendly, the activation material has strong adsorption energy, high phosphorus removal efficiency and high utilization rate of solid waste.

Description

technical field [0001] The invention belongs to the technical field of modification and reuse of solid waste, and more specifically relates to a method for improving soil phosphorus status based on red mud-based composite solid waste material reuse. Background technique [0002] Phosphorus is an important element in the soil and an essential element for plant growth. The amount of phosphorus is directly related to the quality of soil fertility. The average density of total phosphorus and available phosphorus in soil in my country is 0.6g / m3 2 and 3.4g / m 2 , the increase in temperature and precipitation will lead to the rapid release and loss of phosphorus in the soil. Therefore, there is a lack of phosphorus in the soil in tropical and subtropical regions of my country, especially in brick red soil, which seriously restricts plant growth, agricultural development and economic development. [0003] Red mud is the residue produced in the production process of alumina. It is...

AI Technical Summary

Problems solved by technology

[0005] Existing research mainly focuses on the application of red mud composite materials to the removal of heavy metals in soil and sewage. Although this method has a certain effect, the materials after adsorbing heavy metals become new hazardous wastes, and the materials after adsorption are often solidified and stabilized. Landfilling becomes new waste, which easily pollutes soil and groundwater

In addition, the materials after absorbing heavy metals should be treated as hazardous wastes according to the relevant regulations. The cost is high and there is a risk of secondary pollution.

At present, there are few researches and inventions on red mud composite materials for the adsorption and reuse of inorganic elements.