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Outotec is a world leader in sulfuric acid plant design and implementation, with a successful track record stretching back over 90 years. Our portfolio includes plants based on elemental sulfur combustion and metallurgical off-gas handling, as well as plants for special processes such as the thermal decomposition of iron sulfate and spent sulfuric acid. These are complemented by processes for the production of liquid SO2 and SO3, various concentrations of oleum, and special high-grade sulfuric acid.