Shell waste based soil improvement agent as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of soil improvement and particularly relates to a shell waste based soil improvement agent and a preparation method thereof. The preparation method disclosed by the invention comprises the following steps: washing and drying shell wastes, and grinding to obtain a shell powder, carrying out a low-temperature hydrothermal reaction on corncob hydrolysis residues to prepare hydrothermal coke; performing high temperature carbonization in a nitrogen environment to obtain activated carbon, grinding to obtain an activated carbon powder, and respectively grinding phosphogypsum and flue gas desulfurization wastes to obtain a phosphogypsum powder and a flue gas desulfurization waste powder; finally, performing mixing granulation on the shell powder, the activated carbon powder, the phosphogypsum powder and the flue gas desulfurization waste powder, so as to obtain the shell waste based soil improvement agent. According to the preparation method disclosed by the invention, industrial and agricultural wastes are fully utilized as raw materials of the soil improvement agent, and the soil improvement agent is low in cost and environmental-friendly; theprepared soil improvement agent is capable of obviously improving the pH value of soil, improving soil hardening and increasing calcium-magnesium content in the soil.

Description

technical field [0001] The invention belongs to the technical field of soil improvement, and in particular relates to a soil conditioner for shell waste and its preparation method and application. Background technique [0002] At present, the area of ​​soil pollution in my country is increasing. The main reasons for its formation are: soil pollution from sewage irrigation; soil pollution from air pollution; soil pollution from unreasonable use of chemical fertilizers; impact of pesticides on soil and solid Waste pollution of the soil. In particular, the degree of soil acidification in the south is serious, which affects the normal growth of crops. The main reasons for soil acidification are as follows: 1. Large and concentrated precipitation, strong leaching effect, and a large amount of alkaline bases such as calcium, magnesium, and potassium are lost, which is the root cause of soil acidification. For example, acid rain etc. 2. The lack of traditional agricultural measur...

AI Technical Summary

Problems solved by technology

The soil conditioner makes full use of shell waste, waste residue from corncob hydrolysis, phosphogypsum by-product in phosphoric acid production process, and desulfurization waste in flue gas desulfurization process; the porous structure of shell powder makes it have a high The specific surface area and porosity of the shell make the mixing and dispersion of the raw materials more uniform. The calcium carbonate content of the shell powder is high, which can increase the calcium content of the soil. At the same time, the amino acids and polysaccharides contained in the shell powder can enrich the soil nutrients. In addition, the shell powder The addition of powder solves the problem of soil pollution caused by aluminum, heavy metal elements and radioactive elements in fly ash, and the specific surface area of ​​activated carbon prepared from corncob hydrolysis residue is as high as 2000m 2 / g, with strong adsorption performance