The article presents the results of the development of a technological mode for obtaining bisulfite hardwood pulp of high yield on a magnesium base for the production of various types of containerboard. The reliable and effective chemical and heat recovery technology implemented in the bisulfite method allows to use it in independent sulfite process. The effect of the duration of stay at the final temperature on the pulp yield and kappa number was studied when developing the technological mode of cooking. It was found that the increase in the duration of stay at the final temperature of 160 °C more than 40 min leads to violations of the selectivity of the cooking process. Increasing the duration of stay at the final temperature up to 70 min is accompanied by a decrease in pulp yield by 6 % at a constant value of the kappa number of the semi-finished product. Technological cooking mode: hydromodule 5, SO2 consumption 15.0 %, cooking solution pH 4.3–4.5, impregnation time at 120 °C – 35 min, cooking duration at 160 °C – 40 min. The mode allows to get a semi-finished product with a high yield of 60–65 % with a kappa number of 58–60 units without a hot grinding stage. An assessment of the mechanical strength characteristics of the laboratory samples of bisulfite pulp was carried out in accordance with the standards of the Russian Federation. The obtained values of bursting strength, resistance to flat compression, breaking strength, and breaking stress were comparable with the values of the industrial sample of hardwood neutral sulfite semi-chemical pulp with a semi-finished product yield of 75–78 %. It is shown that the presence of bark in the technological chips in the amount of 7.5 % is accompanied by a decrease in the yield of bisulfite hardwood pulp by 4.5 % and mechanical strength by 7.8 %. For citation: Koroleva T.A., Milovidova L.A., Dryakhlitsyn A.A. Production of High-Yield Hardwood Pulp by Bisulfite Cooking. Lesnoy Zhurnal [Russian Forestry Journal], 2021, no. 3, pp. 161–169. DOI: 10.37482/0536-1036-2021-3-161-169
Study results of the effect of reducing the steps of the bleaching scheme hardwood sulfate pulp including oxygen-alkaline treatment (OAT) to obtain chlor-organic compounds in filtrates and cellulose. It was determined that a shortened bleaching scheme including oxygen-alkaline treatment would reduce chlorine dioxide consumption by 48 %, to achieve the requirements of best available technologies for the discharge of adsorbed organically bound chlorine in wastewater and the total organic chlorine content in deciduous bleached cellulose.
The article analyzes data on the use of an integral indicator of the concentration of organohalogen compounds (OHC) to control the quality of industrial and natural waters. The results of studies of natural waters of lakes in the Arkhangelsk region were presented. Several "conventionally clean" lakes that have never been subjected to technogenic impact, as well as those that have previously been subjected to direct anthropogenic impact, were studied. It was shown that the OHC rate of natural waters was not an indicator of water pollution unlike with industrial wastewater. It was emphasized that this indicator of natural water determines the background concentration of organohalogen compounds, which was not a constant value, since it was caused by many biotic and abiotic factors.
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