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Application of MgO as Part of Alkali Source and Substitute for Bleaching Additives in P-RC APMP High Concentration Retention Section |
Received:January 08, 2021 |
DOI:10.11980/j.issn.0254-508X.2021.07.002 |
Key Words:P-RC APMP H2O2 bleaching substitution of NaOH by MgO bulk pulp properties |
Fund Project:国家自然科学基金项目(31070528)。 |
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Abstract:The effects of substitution of 50% NaOH by MgO in the high-consistency (HC) stage of P-RC APMP without adding chelator DTPA or pH buffer Na2SiO3 on the properties of the resultant pulp and the residual H2O2 content were investigated in this study. The results showed that the obtained P-RC APMP has 15.4% increase in bulk but opacity and strength properties decreased after replacing 50% NaOH with MgO. Compared with the pulp adding DTPA, bulk of the pulp without DTPA reduced by 6.5%. However, the tensile index, burst index and tear index increased by 6.6%, 4.4% and 6.6%, respectively. Moreover, the opacity increased by 10.3%, and the brightness had no significant change (only 0.57% increased). The residual H2O2 content was 3.55 g/L at the end of bleaching, which was decreased by 5.1%. Therefore, if the property of bulk was not regarded as most important, using MgO as the alkaline source to replace 50% NaOH in the HC stage of P-RC APMP could also replace the chelating agent DTPA at the same time, thereby the need for metal ion chelating agents was eliminated. |
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