Outotec®'s Selenium Roasting Furnace offers the easiest and cleanest way to remove selenium from the anode slime with high recovery.
In the selenium roasting furnace, copper-free anode slime is dried and selenium evaporates as selenium dioxide gas using oxygen an SO2 gas as reagents. The selenium is recovered from the off-gases into an aqueous solution. The purity of the product selenium is over 99.5% and even higher purity can be reached by treating the selenium in a distillation furnace.
Outotec®’s selenium furnace represents the latest technology to remove selenium with high expertise in material selections. Extensive research work has been carried out to develop the process and to find the most suitable materials for the furnace.