Preparation method of molecular sieve type soil repairing agent

Abstract

The invention discloses a preparation method of a molecular sieve type soil repairing agent. The molecular sieve type soil repairing agent is prepared from diatomite, rice straw, sodium metaaluminate,water glass, silver nitrate and other raw materials. The diatomite and the straw are mixed and subjected to alkali treatment, then the surfaces of particles become concave-convex non-smooth structures, and adsorption sites are greatly increased; semi-dried gel is prepared through suction filtration to produce a molecular sieve, the solid content in a reaction kettle is increased, the unit mass molecular sieve production energy consumption is reduced, a finally obtained composite material is subjected to steam ageing and high-temperature activation, the size of internal pores of the particlesis increased, heavy metal ions and organic macromolecules can be adsorbed and immobilized, the adsorption capacity is improved, the purpose of low-cost pollution restoration of the soil by people canbe achieved, and the method has good economic and environmental benefits.

Description

technical field [0001] The invention relates to the technical field of soil restoration, in particular to a preparation method of a molecular sieve type soil restoration agent. Background technique [0002] With the rapid development of industry and agriculture and the continuous acceleration of urban processes, heavy metals and organic toxic substances discharged from industry, agriculture and daily life continue to increase, and soil pollution is also becoming more and more serious. Heavy metal pollutants have little mobility in the soil and are not degraded by microorganisms. After entering the human body through the food chain, the potential harm is extremely great. According to the statistics of the Ministry of Agriculture of my country, the land polluted by heavy metals in my country accounts for about 1 / 5 of the total cultivated land area, and the annual food loss caused by heavy metal pollution exceeds 20 million tons, and the resulting economic loss reaches 20 billi...

AI Technical Summary

Problems solved by technology

In the hydrothermal reaction process of crystal growth, a large amount of water is used as a solvent, occupying most of the volume in the reactor, so that the output of a single reactor is limited, and because the crystallization process needs to be completed at a high temperature, the existence of a large amount of solvent makes the energy per unit output High consumption

At the same time, the use of molecular sieves alone is limited and cannot meet people's needs. Therefore, further compounding and modification are required to improve the application field and efficiency of molecular sieves.