US 9,216,904 B2 · Recovery of sulfur from sulfur-containing waste

Abstract

A process and apparatus are provided for treating sulfur-containing waste, resulting in recovered pure sulfur and a sulfur-free ash for landfilling. In regards to a process, a sulfur-containing waste is heated in a receptacle at between 120 and 160° C. to obtain a mixture including raw molten sulfur. The process optionally separates solids, by rough screening, from the mixture and transfers the mixture, following optional screening, to a separating reactor heated at between 450 and 500° C. to create sulfur vapor and sulfur-free solid phase. The process transfers the sulfur vapor to a condenser cooled to between 120 and 140° C. to obtain molten sulfur and transfers the solid phase to a cooling conveyor, with the solid phase being collected as ash for landfilling. The process further removes gases from the condenser with an off-gas cleaner and collects from the condenser essentially pure sulfur.

Claims14

Dependent claims

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° C., 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.

4 more elements

Dependencies are inferred from the claim text.

Recovery of sulfur from sulfur-containing waste

Life of this patent

Recovery of sulfur from sulfur-containing waste

Life of this patent

Abstract

Claims14