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Valmet to Supply Sulfuric Acid Plant to Metsä Group Bioproduct Mill in Finland

Valmet sulfuric acid plant Valmet will supply a sulfuric acid plant to Metsä Group's bioproduct mill, which will enable the mill to become nearly self-sufficient in sulfuric acid.

May 20, 2016 - Valmet will supply a sulfuric acid plant to Metsä Group's bioproduct mill (under construction) in Äänekoski, Finalnd for in-house sulfuric acid production.

The new plant will enable the bioproduct mill to become nearly self-sufficient in sulfuric acid, as the odorous gases produced in the pulping process can be converted into sulfuric acid. It will also help to reduce the mill's wastewater load considerably.

"The sulfuric acid plant producing process chemicals from sulfur compounds from odorous gases is a remarkable step towards closed chemical circulation and further improves the environmental performance of the bioproduct mill," said Timo Merikallio, Project Director of bioproduct mill at Metsä Group.

According to Valmet, this will be the world's first larger scale sulfuric acid plant that will be in operation at a pulp mill. The plant consists of a concentrated non-condensable gas (CNCG) incinerator and a sulfuric acid converting plant.

The production capacity of the plant will be approximately 35 tons of sulfuric acid per day.

Construction of Metsä Group's bioproduct mill began in April 2015 and is expected to be operational in the fall of 2017. When operational, the mill's annual pulp production will be approximately 1.3 million tonnes, of which 800,000 tonnes will be softwood pulp and 500,000 tonnes hardwood pulp. The mill will also produce tall oil and bioenergy.

Valmet is a leading global developer and supplier of services and technologies for the pulp, paper and energy industries. To learn more, please visit:

SOURCE: Valmet and Metsä Group

See related story:
» Metsä Fibre Begins Construction of EUR 1.2 Billion Bioproduct Mill in Äänekoski, Finland (April 23, 2015).