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US 2013/0330266 A1Published application
Recovery of sulfur from sulfur-containing waste
AssigneesEnvironmental Services Company Ltd., Israel Garden
InventorsGilad Golub, Julio Subovich, Ofer Garden, Israel Garden
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Abstract
The invention provides an environmentally friendly industrial process for treating sulfur-containing waste, resulting in recovered pure sulfur and a sulfur-free ash for landfilling.
Claims14
A process for disposing of sulfur-containing waste, comprising the steps of
- i) heating a sulfur-containing waste in a receptacle at a temperature of between 120 and 160°, thereby obtaining a mixture comprising raw molten sulfur;
- ii) optionally separating solids, by rough screening, from said mixture obtained in step i);
- iii) transferring said mixture obtained in step i) optionally screened as in said step ii) from said receptacle to a separating reactor heated at a temperature of between 450 and 500° C., whereby creating sulfur vapor and sulfur-free solid phase;
- iv) transferring said sulfur vapor formed in step iii) from said reactor to a condenser cooled to a temperature of between 120 and 140° C., whereby obtaining molten sulfur;
- v) transferring said solid phase formed in step iii) from said reactor to a cooling conveyor, and collecting said phase as an ash for landfilling;
- and
- vi) removing gases from said condenser by means of an off-gas cleaner, and collecting from said condenser essentially pure sulfur.
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An apparatus for converting sulfur-containing waste to essentially pure sulfur product and to solid waste for landfilling, comprising
- i) receptacle for sulfur-containing waste, provided with heating to keep the receptacle at a temperature of from 120 to 160° C.;
- ii) separating reactor connected in a gas-proof manner with said receptacle, for heating material transferred from said receptacle, provided with indirect heating to keep the reactor at a temperature of 450 to 500° C.;
- iii) cooling screw conveyor connected in a gas-proof manner with said reactor, for cooling spent precoat solid phase transferred from said reactor, wherein the temperature of said condensed phase decreases to less than 60° C.;
- iv) condenser connected to said reactor in a gas-proof manner with said reactor, for cooling sulfur vapor transferred from said reactor, provided with cooling to keep the condensed sulfur in the condenser at a temperature of from 118 to 130°;
- v) off-gas cleaner connected in a gas-proof manner with said condenser, for removing gases from molten sulfur in said condenser;
- and
- means for controlling the transfer of (a) material from said receptacle to said reactor, (b) spent precoat solid phase from said reactor to said conveyor, (c) sulfur vapor from said reactor to said condenser, (d) gases from said condenser to said off-gas cleaner, and (e) molten sulfur from said condenser to a product container.
4 more elements
Dependencies are inferred from the claim text.