Valmet-supplied high consistency bleaching system was started up according to plan at Rottneros pulp mill in Sweden. The start-up was smooth and the 48 hours test run was approved, as the company said in the press release received by Lesprom Network.
The bleaching system is the first step in a larger rebuild project, called Agenda 500, at the mill. The long term goal is to increase both availability and the total production volume of Rottneros two pulp mills to reach a capacity of 500,000 ton per year.
Bleaching is part of the pulp production process. In bleaching the brightness of the pulp in a mechanical pulping line is increased by peroxide.
The new bleaching system consists of a chemical mixer and a bleaching tower, two washing stages with screw presses, and medium consistency pumps. Before the bleaching tower the pulp is washed and pressed to a high consistency. Bleaching in high consistency gives an effective bleaching reaction and less chemicals are needed.
Rottneros produces market pulp and has an annual production capacity of just under 350,000 tonnes of pulp, produced at two mills in Sweden.
Valmet is the leading global developer and supplier of process technologies, automation and services for the pulp, paper and energy industries.
