Fly ash chelating agent and preparation method thereof

Abstract

The invention provides a fly ash chelating agent and a preparation method thereof. The fly ash chelating agent includes, by weight, 10% to 20% of trithione triazine trisodium salt, 3% to 8% of sodiumtrithiocarbonate, 2% to 6% of 2, 6-diamido pyridineethanethiol, 0.5% to 1.5% of 1, 3-bisbenzamido ethanethiol, 0.2% to 0.8% of an additive and 60% to 80% of water. The preparation method of the fly ash chelating agent comprises adding trithione triazine trisodium salt, sodium trithiocarbonate, 2, 6-diamido pyridineethanethiol and 1, 3-bisbenzamido ethanethiol into water, carrying out stirring to obtain a mixed solution, and adding the additive into the mixed solution. The preparation method has simple processes. The fly ash chelating agent is an organic sulfur compound chelating agent, has large molecular weight, a strong flocculating function and a strong heavy metal chelating capacity. The additive is soluble starch, improves the chelating ability of the chelating agent and reduces the toxicity of the macromolecular heavy metal chelating agent. The modified product is easily biodegrade.

Description

technical field [0001] The invention relates to the field of environmental protection fine chemicals, in particular to a fly ash chelating agent and a preparation method thereof. Background technique [0002] At present, the reagents used in the market for heavy metal pollution in fly ash of waste incineration plants mainly include physical and chemical substances. In physics, lime or cement is usually solidified, but the solidification time is long, and it is easy to cause secondary pollution; in chemistry, the common substance is EDTA, and in chemistry, EDTA has strong metal chelating properties, but its molecular weight is small, forming The chelates are easy to flow into the water body under acidic solution leaching, causing secondary pollution. However, the reagents mainly used in the market have the following disadvantages: weak chelating ability, poor thermal stability, and complicated preparation methods. Contents of the invention [0003] The object of the prese...

AI Technical Summary

Problems solved by technology

In physics, lime or cement is usually solidified, but the solidification time is long, and it is easy to cause secondary pollution; in chemistry, the common substance is EDTA, and in chemistry, EDTA has strong metal chelating properties, but its molecular weight is small, forming The chelates are easy to flow into the water body under acidic solution leaching, causing secondary pollution

However, the reagents mainly used in the market have the following disadvantages: weak chelating ability, poor thermal stability, and complicated preparation methods