Recycling method and apparatus for soil contaminated with mercury and dioxin
AssigneeChina Petrochemical Development Corporation
InventorsShe-Sheng Su, Yi-Shan Shen
Life of this patent
Estimating the term…
Abstract
The present disclosure provides a method for recycling soil contaminated with mercury and dioxin. The method includes: desorbing mercury and dioxin from the contaminated soil by an indirect rotary furnace; condensing the mercury and discharging it by a condensing and discharging unit; and a secondary indirect burner for decomposing dioxin at a high temperature, so as for the concentration of the contaminants in the exhaust being examined to meet regulation standards and the treated soil to meet the current regulations. The present disclosure also provides an apparatus for recycling contaminated soil containing mercury and dioxin.
Claims20
An apparatus for treating soil contaminated with mercury and dioxin, comprising:
- an indirect heating rotary furnace configured to hold and heat treat the contaminated soil for the mercury and the dioxin to desorb from the contaminated soil to generate exhaust containing the mercury and the dioxin and treated soil;
- a treated soil storage tank in communication with the indirect heating rotary furnace, and configured to receive the treated soil;
- a first dust-collecting unit in fluid communication with the indirect heating rotary furnace, and configured to collect dust from the exhaust;
- a condensing and recovering unit in fluid communication with the first dust-collecting unit, and configured to condense mercury vapor in the exhaust and discharge liquid mercury;
- a secondary indirect burner in fluid communication with the condensing and recovering unit, and configured to heat treat the exhaust and decompose the dioxin in the condensed exhaust;
- a second dust-collecting unit in fluid communication with the secondary indirect burner, and configured to collect the dust from the exhaust in the secondary indirect burner;
- and
- a chimney in communication with the second dust-collecting unit, and configured to discharge the exhaust from the second dust-collecting unit into air.
A method for recycling soil contaminated with mercury and dioxin, comprising:
- treating contaminated soil with an indirect heating rotary furnace for the mercury and the dioxin to desorb from the contaminated soil to generate exhaust containing the mercury and the dioxin and treated soil;
- collecting dust from the exhaust with a first dust-collecting unit;
- receiving the exhaust from the first dust-collecting unit by a condensing and recovering unit to condense mercury vapor in the exhaust, and discharging crude mercury as a liquid;
- passing the condensed exhaust through a secondary indirect burner to decompose the dioxin in the condensed exhaust;
- collecting dust from the exhaust in the secondary indirect burner by a second dust-collecting unit;
- and
- discharging the exhaust from the second dust-collecting unit through a chimney in communication with the second dust-collecting unit into air.
Dependencies are inferred from the claim text.