Lignin-based triaminotriethylamine salt waste incineration fly ash heavy metal stabilizer and preparation method and application thereof

Abstract

The invention discloses a lignin-based triaminotriethylamine salt waste incineration fly ash heavy metal stabilizer and a preparation method and application thereof, and belongs to the technical fieldof environmental protection technologies and municipal solid waste incineration fly ash treatment. The relative molecular weight of the stabilizer is 3000-20000, and the stabilizer is specifically lignin-based triaminotriethylamine sodium salt or lignin-based triamino triethylamine potassium salt. The method comprises the following steps: firstly, carrying out oxidative degradation on alkaline lignin, exposing a reaction site, carrying out a Mannich reaction on an oxidized aminating agent and the lignin, inoculating amido to the lignin, wherein a condensation reaction increases the molecularweight and enlarges the chelate ring, and introducing C=S double bonds through an esterifying agent to obtain the lignin-based triaminotriethylamine derivative. The method can effectively reduce the leaching concentration of heavy metals such as Pb and Cd in the fly ash, promotes the conversion of the heavy metals into a form with low biotoxicity, is low in energy consumption, high in heavy metalstabilization efficiency and good in volume reduction effect, and is suitable for industrial application of harmless treatment on municipal solid waste incineration fly ash.

Description

technical field [0001] The invention belongs to the technical fields of environmental protection technology and municipal solid waste incineration fly ash disposal, and specifically relates to a lignin-based triaminotriethylamine salt garbage incineration fly ash heavy metal stabilizer, a preparation method and an application. Background technique [0002] The fly ash of domestic waste incineration contains heavy metals with high leaching toxicity, which causes great harm to the environment. Heavy metals are not easily decomposed. Over time, they will be lost, migrated, transformed, and accumulated in the soil, water, and gas environments, and will be enriched through the biological chain. Humans and the environment have always been inextricably linked, and will eventually affect human health. , social development, and natural environment produce irreversible harm, which violates the concept of sustainable development of the country. [0003] At present, the treatment techn...

AI Technical Summary

Problems solved by technology

[0007] With the continuous development of heavy metal disposal technology in domestic waste incineration fly ash, a variety of fly ash heavy metal stabilizers have been synthesized at home and abroad. From the experimental research, the research on heavy metal ion adsorbents containing dithioamino groups and S atoms is comparatively Many, publication numbers CN1831020A, CN102784622A, US5372726, CN106955451A, CN108546242A etc. adopt a series of amination, condensation and esterification reactions to synthesize dithiocarbamate derivatives. Studies have shown that modified polymerization containing N and S coordination atoms The reason is that N and S atoms contain isolated electrons, which can form stable complexes with heavy metal ions, but their effect on the disposal of heavy metals in fly ash is not obvious, especially for heavy metals. It is difficult for Pb and Cd to meet the "Standards for Pollution Control of Domestic Waste Landfill Sites" (GB16889-2008) in fly ash treatment, and the synthesis cost of stabilizers is high, so it is difficult to apply and promote on an industrial scale

Images