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A pulp mill in Rauma, Finland Woodchips for paper production. A pulp mill is a manufacturing facility that converts wood chips or other plant fiber sources into a thick fiber board which can be shipped to a paper mill for further processing. Pulp can be manufactured using mechanical, semi-chemical, or fully chemical methods (kraft and sulfite ...
The power station was completed in 1907, and the following year the sulfite process chemical pulp mill was completed the following year. All the upgrades were finalized in 1910, having cost NOK 4.1 million—twice the budget. A particular contributor was the pulp mill, which had cost NOK 3 million. [16]
International Paper: Kraft paper mill Woodchips for paper production. The kraft process (also known as kraft pulping or sulfate process) is a process for conversion of wood into wood pulp, which consists of almost pure cellulose fibres, the main component of paper.
A typical refiner pulp can require 2000 kWh/mass ton pulp. [1] A larger mechanical pulp and paper mill can, including the paper production, consume 200-300 MW electricity. The chemical pulping processes can often generate enough energy (steam and electricity) to make the mill energy self-sufficient.
Chemical pulping involves dissolving lignin in order to extract the cellulose from the wood fiber. The different processes of chemical pulping include the Kraft process, which uses caustic soda and sodium sulfide and is the most common; alternatively, the use of sulfurous acid is known as the sulfite process, the neutral sulfite semichemical is treated as a third process separate from sulfite ...
Chemical processes quickly followed, first with Julius Roth's use of sulfurous acid to treat wood in 1857, followed by Benjamin Chew Tilghman's US patent on the use of calcium bisulfite, Ca(HSO 3) 2, to pulp wood in 1867. [3] Almost a decade later in 1874 the first commercial sulfite pulp mill was built in Sweden.
Recovery boiler is the part of kraft process of pulping where chemicals for white liquor are recovered and reformed from black liquor, which contains lignin from previously processed wood. The black liquor is burned, generating heat, which is usually used in the process of making electricity, much as in a conventional steam power plant .
The mill used Tsuga heterophylla (western hemlock) trees to create a premium bleached paper pulp. In 1931, Rainier Pulp and Paper began working with the Du Pont chemical company to produce hemlock pulp for the manufacture of rayon. Two additional pulp mills were constructed and began operation in the state of Washington.