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A METHOD OF REPLACING SODIUM LOSSES IN A PULP MILL, A METHOD OF PRODUCING BLEACHED CELLULOSIC PULP, AND A SYSTEM
A METHOD OF REPLACING SODIUM LOSSES IN A PULP MILL, A METHOD OF PRODUCING BLEACHED CELLULOSIC PULP, AND A SYSTEM
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机译:一种在纸浆磨机中取代钠损失的方法,生产漂白纤维素纸浆的方法,以及一种系统
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摘要
According to an example aspect of the present invention, there is provided a method of replacing with sodium make-up chemicals sodium losses caused by outflows in a pulp mill which employs a kraft process for producing cellulosic pulp, wherein the pulp mill includes a unit for conversion of sulphurous compounds, which is fed with sulphurous substances of the kraft process to convert said sulphurous substances into oxidized sulphurous compounds, said method comprising using sodium sulphate possibly together with other sodium salts as the main make-up chemical, to achieve an essentially sodium hydroxide free feed of sodium make-up chemicals, and at least a part of the sulphur contained in the sodium sulphate make-up chemical being used for producing oxidized sulphurous coumpounds in said unit for conversion of sulphurous compounds.
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