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Our team has done research about dendritic polymer stabilization agents for many years and accumulated large amount of experience, and developed a variety of new organic agents for stabilization for heavy metals in fly ash. We successfully applied for patents and some patents are authorized in recent years.
In term of the methods of stabilization for heavy metals in MSWI fly ash, the traditional stabilization agents have disadvantages ， such as high dosing quantity, poor resistance to acid and low efficiency in stabilization and its result can’t meet the stabilization. Our group has designed a variety of new style stabilization agents which have strong acid resistance ability, higher efficiency etc. And realizing the non-hazardous disposal of fly ash, reach the standard of sanitary landfill and realize the utilization of fly ash after stabilization. If so, not only can we save land resource, but realize waste recycling to save raw materials.
Our fly ash stabilization agents have highly symmetrical dendritic skeleton and single molecule reach to nano-sized, which can realize the precise control of the molecular sizes, shapes and the functional groups. By adding functional groups to the polymers and chelation can be taken between agents and some heavy metal ions which can generate =precipitations which has resistant ability to acid.
Following graphs are the comparison of results between agent we created and the traditional agents (measurement methods according to《Solid waste-extraction procedure for toxicity of solid waste- Acetic acid buffer solution method》 (HJ/T300-2007) (in Chinese) solvent for 2#), the experimental results indicate that the dosing quantity of our agents is less, and can reach the standard of landfill after processing.
This graph shows the planar structure of chelating product by which heavy metals are chelated. The chelating product has a network structure. There were interspaces in the surface of chelating product, which was propitious to wrap up heavy metals and keep the chelating product more stable. The network structure of the chelating agent can maintain long-term stability, and heavy metals cannot be easily released.