Servizio Comunitario di Informazione in materia di Ricerca e Sviluppo - CORDIS

Computing of thermo-chemistry of the feed

In order to determine the degree of feed decomposition/transformation in different processing conditions, and to get information about the formation of hazardous compounds during cooling of hot plasma gases, thermodynamic and thermo chemical calculations have been performed by computer codes ASTRA 4.0 and FactSage, respectively.

Equilibrium compositions were determined for the thermal plasma treatment of following models in the temperature range of 293-6000K:

Inorganic wastes (WASTASH):
- Steel-making dust containing iron-oxide, zinc-oxide, lead?oxide and silicon-dioxide as main components;

- Red mud from bauxite processing, which contains iron-oxide, aluminum-oxide, silicon-dioxide and sodium-oxide as main components.

Organic wastes (HAZCHEM):
- Aliphatic and aromatic hydrocarbons (n-hexane, toluene);

- Chlorinated aliphatic hydrocarbons (chlorinated and fluorinated ethane derivatives);

- Polychlorinated aromatic hydrocarbons as models of pesticides (hexachloro-benzene);

- Amino-aromatic compounds as models of waste transformer oils (aniline).

It has been proved that all models as above can be decomposed and transformed to non-hazardous solid, liquid and gaseous products during thermal plasma treatment. Based on results particular calculations, the actual decomposition conditions to be tested in the experiments have been fixed. Special attention was devoted to excluding formation of hazardous by-products on cooling of plasma gases.

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