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| MgO作为P-RC APMP高浓停留段部分碱源并替代漂白助剂的研究 |
| Application of MgO as Part of Alkali Source and Substitute for Bleaching Additives in P-RC APMP High Concentration Retention Section |
| 收稿日期：2021-01-08 |
| DOI：10.11980/j.issn.0254-508X.2021.07.002 |
| 关键词: P-RC APMP H2O2漂白 MgO取代NaOH 松厚度 纸浆性能 |
| Key Words:P-RC APMP H2O2 bleaching substitution of NaOH by MgO bulk pulp properties |
| 基金项目:国家自然科学基金项目（31070528）。 |
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| 摘要:本研究探究了P-RC APMP高浓停留段MgO替代50% NaOH时，不添加螯合剂DTPA或pH缓冲剂Na2SiO3对纸浆性能和漂后残余H2O2含量的影响。结果表明，MgO替代50% NaOH后，纸浆的松厚度提高了15.4%，但不透明度和强度性能均下降；不添加DTPA的纸浆比添加DTPA的纸浆松厚度降低了6.5%，抗张指数、耐破指数和撕裂指数分别上升了6.6%、4.4%和6.6%，不透明度上升了10.3%，白度变化不大（增加了0.57%），漂后残余H2O2含量为3.55 g/L，降低了5.1%。因此，在松厚度要求不高时，MgO替代50% NaOH作为P-RC APMP高浓停留段碱源可同时替代螯合剂DTPA，即可以免加金属离子螯合剂。 |
| 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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