Method for preparing molecular sieve type heavy metal curing agent

Abstract

The invention discloses a method for preparing a molecular sieve type heavy metal curing agent. The molecular sieve type heavy metal curing agent is prepared from raw materials such as ferrochrome slag, monopotassium phosphate, tetramethyl-disilazane, sodium metaaluminate, sodium silicate and silver nitrate. According to the method, a molecular sieve is produced from half-dry gel through suction filtration, the solid content of a reaction kettle is increased, the production energy consumption of a unit mass molecular sieve is reduced, on the basis, silanization modification is implemented on the molecular sieve, and a calcium series phosphate chemical bonding material is introduced, so that on one hand, the static and dynamic water adsorption amount of the molecular sieve is reduced, the hydrophobicity of the molecular sieve is improved, and the situation that the heavy metal curing sites are reduced due to water adsorption is reduced, on the other hand, heavy metal ions are adsorbed through hydroxyapatite, ion exchange is implemented under the catalysis action of the molecular sieve, corresponding heavy metal phosphate is formed, and heavy metals are immobilized in an immobilizingagent efficiently for a long time.

Description

technical field [0001] The invention relates to the technical field of heavy metal treatment, in particular to a preparation method of a molecular sieve type heavy metal curing agent. Background technique [0002] Heavy metal pollution has become one of the greatest hazards to human existence. Heavy metal pollution can be treated by many different technologies, and solidification / stabilization technology is one of the main methods to deal with toxic pollutants in the world. The solidification / stabilization technology uses a solidified substrate to adsorb, fix or coat heavy metal wastes to reduce their environmental hazards. The most common cement curing technology has the problems of easy carbonization and corrosion, insufficient durability, and the curing of heavy metal ions is only a simple physical package. Therefore, there is an urgent need for a new material that can efficiently solidify heavy metals. [0003] Zeolite molecular sieves are a class of aluminosilicates ...

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.