The combined direct lead smelting process.

Oxidation smelting and roast reaction smelting are combined in direct lead smelting process. In the oxidation process the sulphur content of the bullion coming from the roasting process is reduced, and in the roast reaction process the evaporation of PBS from lead matte layer produced in the oxidation process is removed. To enhance the chemical reaction of the matte with the slag and to promote the coalescence of the matte droplets in the slag a mixer disperses the slag into the matte. The oxygen supersonic top-blowing technique used produces relatively little dust.
Oxidation smelting and roast reaction smelting are combined in direct lead smelting process. In the oxidation process the sulphur content of the bullion coming from the roasting process is reduced, and in the roast reaction process the evaporation of PBS from lead matte layer produced in the oxidation process is removed. To enhance the chemical reaction of the matte with the slag and to promote the coalescence of the matte droplets in the slag a mixer disperses the slag into the matte. The oxygen supersonic top-blowing technique used produces relatively little dust.