28 PROJECTS & CONTRACTS


In house sulphuric acid production for Äänekoski mill


Pulp Paper & Logistics


ordered a plant for in-house sulphuric acid production from Valmet.


M The sulphuric acid plant, which


is expected to start up in the third quarter of 2017, will enable the mill to utilise chemicals in the odorous gases of the pulp manufacturing process. This will help the mil to considerably


etsä Group’s bioproduct mill at Äänekoski in Finland has


reduce the waste water load. “The sulphuric acid plant


producing process chemicals from sulphur compounds from odorous gases is a remarkable step towards closed chemical circulation and further improves the environmental performance of the bioproduct mill,” said Metsä project director Timo Merikallio. The plant consists of a


concentrated non-condensable gas (CNCG) incinerator and a sulphuric acid converting plant


with a production capacity of about 35 tons of sulphuric acid per day. This will be the world’s first larger scale sulphuric acid plant that will be in operation at a pulp mill.


The new plant will enable the bioproduct mill to become nearly self-sufficient in sulphuric acid. The CNCG incineration plant can be used as a back-up boiler for producing process steam by incinerating CNCG, tall oil pitch or liquid methanol.


Risto Hämäläinen, director of


environmental systems at Valmet, added: “More efficient utilization of the raw materials and putting circular economy into practice within the industry increases the need for new innovations. The sulphuric acid plant technology that will be delivered to Äänekoski is developed by Valmet. We have developed also multiple new biotechnology processes for pulp and energy industries including lignin and bio-oil production.”


Successful start of first of two tissue machines at St Croix


The first of two new tissue machines has been started up at the St Croix Tissue mill in Maine, USA.


Supplied by Andritz, the PrimeLine W8 tissue machine with a steel Yankee has a design speed of 2,000 m/min and a width of 5.6 metres. The Yankee, manufactured


entirely of steel and with a diameter of 18 feet, is said


July/August 2016


to provide efficient drying at minimized energy costs and a safe operation. Preparations are under way for


start-up of the second Andritz tissue machine supplied to St Croix Tissue, which is scheduled for end of July 2016.


Both machines have an aggregate


capacity of 126,000 tons per year for the production of hygienic papers and napkin tissues.


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