The invention discloses a method for normal-pressure
distillation of
zinc direct-dipping residue to extract
sulfur. The method includes six processes such as blending, neutralizing and
drying of
sulfur residue, melting of
sulfur, normal-pressure
distillation of sulfur, cooling and humidifying of residue and condensing of sulfur steam, and specifically includes: enabling
lime and wet sulfur residue after being blended through a belt to fall into a
rotary kiln for neutralizing and
drying of the sulfur residue to form neutral dry sulfur residue; enabling the dry sulfur residue to fall into a sulfur
melting furnace of 130-160 DEG C to form sulfur residue
slurry; feeding the sulfur residue
slurry into a normal-pressure
distillation tank with temperature higher than 500 DEG C; allowing the surface of the sulfur residue
slurry to be fully spread in the normal-pressure distillation tank, separating sulfur out, and enabling residue to fall into a residue collection tank; allowing indirect cooling and mist humidifying of the residue in the residue collection tank, discharging the residue, and allowing a condensing tank to continuously spray to condense and cool sulfur steam to
room temperature; feeding water steam below 130 DEG C into the
rotary kiln, and laying a heat insulating layer in high-temperature equipment pipelines and connectors without air seeping. The method can be used for extracting sulfur from
zinc high-pressure
oxygen direct-dipping hot filter residue and normal-pressure
oxygen direct-dipping sulfur residue. By the method,
recovery rate of lead,
zinc, silver and
indium is 99.5%, and sulfur extraction rate is 95%; the method is supportive of high-yield continuous running and free of
oxygen seepage explosion potential.