Preparation method of composite molecular sieve defluorinating agent

Abstract

The invention discloses a preparation method of a composite molecular sieve defluorinating agent. The composite molecular sieve defluorinating agent is prepared from raw materials including aluminum chloride, an ethoxypropoxy three-block polymer F127, calcium nitrate, sodium metaaluminate, sodium silicate, silver nitrate and the like. According to the preparation method disclosed by the invention,a calcium and aluminum oxide compound is prepared through immersion and high-temperature calcination; semi-dry gel is prepared through suction filtering to produce a molecular sieve; the solid content in a reaction kettle is improved and the production energy consumption of molecular sieve with the unit mass is reduced; after being combined, the calcium and aluminum oxide compound and the molecular sieve have ultra-strong affinity on fluorine ions; protonation and deprotonation on hydroxyl on the surface also have a promotion effect on adsorption of the fluorine ions; under a high-temperaturecondition, part of the defluorinating agent is thermally decomposed so that a lot of active sites and hydroxyl groups are generated on the surface of an adsorbent; the defluorinating agent can be subjected to ion exchange with the fluorine ions so that the fluorine ions are enriched on the surface of the adsorbent and the aim of removing the fluorine ions is realized.

Description

technical field [0001] The invention relates to the technical field of defluorinated materials, in particular to a preparation method of a composite molecular sieve defluorinated agent. Background technique [0002] Fluorine is one of the important trace elements in the human body and is the protective umbrella for teeth. Fluorine is also widely used in household products, office automation equipment, semiconductors, automobiles and other fields. However, while fluorine serves human beings, it also brings great hidden dangers to the environment and human health. For example, the massive discharge of fluorine-containing wastewater has polluted the groundwater in some parts of our country. Fluoride pollution is a very serious global environmental problem. WHO and EPA have clearly pointed out that the concentration of fluoride ion in drinking water is not allowed to exceed 1.5mg / L. The concentration of fluoride ions in groundwater in some areas of my country seriously exceed...

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.