| 摘要 |
<p>A process for removing mercury and dioxins of contaminated soil, characterised in that said soil is treated in the following stages: i) pyrolysing the soil in a furnace at a temperature in the range of from about 450 °C up to about 800 °C, forming a soil residue (8) depleted of mercury and dioxins and a gas phase (7) containing mercury and dioxins, ii) removing the soil residue depleted of mercury and dioxins from the furnace, iii) further treating the gas by post combustion (9) at a temperature of at least about 800 °C and a retention time of at least 1 second, iv) quench cooling (11) the hot combustion gases formed in stage iii) to a temperature in the range of from about 100 °C up to about 200 °C, v) recovering (15) mercury in the gas from stage iv), vi) treating the residual non-condensed gas (19) from stage v) before discharge to atmosphere (21).</p> |
