The off-gases from the flash smelting furnace contain 35-40% sulfur dioxide. They are cooled and cleaned in a waste-heat boiler, electrostatic precipitator and scrubbing system before being sent to the sulfuric acid plant. The acid plant produces either 94% or 98% sulfuric acid with tail gas containing typically 50-70 ppm sulfur dioxide, resulting in a measured sulfur fixation of greater than 99.9%. In 2006 the company produced and sold approximately of sulfuric acid, made from the formerly released gas. The acid recovery plant is designed to also recover waste heat from the process to produce electrical power. Approximately 24 MW of electrical power is generated, representing 70% of the smelter’s electrical requirements.