Peroxide Bleaching Study of Softwood TMP with Mg based Alkali Produced from Natural Brucite, 2016 International Mechanical Pulping (IMPC) Conference 


High brightness is a valuable asset for paperboards and printing papers. Therefore, many mills would like to upgrade to higher brightness grades. Environmental awareness, in turn, tightens COD limits of the mills’ effluents. It is a challenge to meet targets simultaneously for high brightness and low-wastewater COD. For the first time, natural Mg(OH)2 was successfully tested in pulp bleaching process. We report mechanical pulp laboratory bleaching trials with Mg(OH)2 as partial alkali source. The target was to evaluate the suitability of a new origin and manufacturing method of Mg(OH)2. The product is manufactured from the mineral brucite—natural Mg(OH)2. After mining, brucite ore is crushed and classified on site by x-ray separation. The fraction with the highest magnesium hydroxide content and the lowest concentration of impurities—which can have an effect on the process—is selected for the production of Mg(OH)2 for mechanical pulp bleaching. The manufacture of natural Mg(OH)2 is a simple and environmentally friendly process—its cost structure is less dependent on the price of energy and it has lower CO2 emissions than that production of synthetic Mg(OH)2.

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Author: L. Johansson, A. Fredrikson, A. Rodionov, and L. Salminen
Peroxide Bleaching Study of Softwood TMP with Mg based Alkal
Peroxide Bleaching Study of Softwood TMP with Mg based Alkali Produced from Natural Brucite, 2016 International Mechanical Pulping Conference
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