Valmet will deliver a new ash crystallization plant for Mercer Stendal mill in Arneburg, Germany. This investment is part of Mercer’s long-term vision to further reduce the mill’s emissions and improve its performance. Ash crystallization plant contributes to this target by helping to close the mill’s chemical circulation, reducing the need for make-up chemicals, and by helping to extend the recovery boiler maintenance intervals to 24 months and beyond.
“Since the mill started up in 2004, we have systematically invested in improving its performance and sustainability. Our sustainability efforts are guided by the Mercer vision and values and our long-standing philosophy of responsible business practices that encompass sustainability, safety, financial responsibility, and strong leadership. The new ash crystallization plant will help us to further improve both operational and environmental performance. We chose Valmet to deliver this project based on both their technical expertise and our previous joint projects,” says Dr. Martin Zenker, Mill Manager, Mercer Stendal.
The ash crystallization plant will recover valuable sodium salts and remove non-process elements, primarily chloride and potassium, from the mill’s liquor cycle. This reduces plugging and corrosion in the mill’s recovery boiler which enables longer intervals between maintenance shutdowns, increasing recovery boiler’s long-term availability. Removing these non-process elements with Valmet’s Ash Crystallizer design eliminates the need for ash dumping, which in turn reduces wastewater and lowers costs through decreased make-up chemical demand. This solution delivers clear environmental benefits by reducing associated emissions.
“We are committed to advancing circularity and resource efficiency. Delivering a new ash crystallization solution to an existing mill is very much in line with these targets and brings several operational and environmental benefits. This project showcases that the ash crystallization solution is not only suitable for new large mills but also brings significant benefits to existing mills. We truly value our cooperation with Mercer and the Stendal mill in finding long-term solutions to optimize the mill’s performance,” says Claus Jensen-Holm, Director, White Liquor and Evaporation, Pulp Mills at Valmet.
The order was included in Valmet’s orders received in the first quarter of 2026. The value of the order will not be disclosed. The new crystallization plant is scheduled to be started up during the fourth quarter of 2027.