Process introduction and process parameters:

When the zinc sulfide ore concentrate is treated by the high pressure acid leaching technique, the sulfur in the sulfide ore is enriched in the slag in the form of elemental sulfur. Sulfur slag is composed of elemental sulfur, sulfide and sulfate, and the elemental sulfur content is generally as high as 60% or more.

The sulfur in the sulfur residue has a low boiling point (444.6 ° C). The boiling point of zinc and other sulfides is much higher than the boiling point of sulfur, and it is a non-volatile sulfide. The elemental sulfur content is high, which can be separated and recovered by vacuum distillation.

We adopt intermittently operation. The molten sulfur’s temperature is 150-200 ° C. The distillation temperature is between 400 and 440 ° C. The condensation temperature is 180-200 ° C. The purity of sulfur in products can reach over 98%, and the sulfur recycled from elemental sulfur can reach more than 82%.

heating furnace, distilling furnace, dasher, feed inlet,   exhaust, condenser, discharge outlet, slag tap

Flow chart：Sulfur slag- Fusion- Distillation -Condensation- Vapor+ Sulfur+ Distillation residue