Sulfuric Acid tech


Our sulfuric acid technology is based on more than 90 years’ experience in a diverse range of projects around the world. We have delivered more than 650 complete plants with daily capacities ranging from 100 to 5,000 tons. Our plant solutions are fully customizable and designed to maximize operational efficiency, sustainability, and safety. We also offer a comprehensive range of service solutions to support you throughout your plant’s lifecycle.
  • Sustainable proprietary technology developed through continuous R&D
  • Capabilities ranging from modular solutions to lump sum turnkey plant (LSTK) delivery
  • In-house process chain expertise associated with upstream metallurgical processes (smelting or roasting)
  • Complete lifecycle solutions covering design, operation, maintenance, and modernization

Customized, sustainable solutions from a global industry leader

Metso 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.

Metallurgical OFF-GAS treatment

Whether you are facing declining ore grades or stricter environmental restrictions, we analyze the complete process chain, beginning from the upstream metallurgical process, when designing your acid plant solution. From hot and wet gas cleaning to the sulfuric acid plant and acid production, we use our proven expertise to develop the most technologically efficient and economically sustainable solution for your application.

Sulfuric Acid production

In a pyrometallurgical process, gas from the gas cleaning section enters the sulfuric acid plant via the drying tower, where most of the humidity is removed in order to minimize the potential for corrosion inside the plant. Before entering the stainless steel converter, the gas temperature must be increased to accommodate the operating temperature of the catalyst. Sulfur dioxide is converted into sulfur trioxide, and the process gas is sent to the first absorption step where sulfur trioxide is removed and forms sulfuric acid. After further conversion, the gas is routed to the stack via the final absorber

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