APPLICATION OF MAGNESIUM HYDROXIDE IN EPD2 OF DiEpDz BLEACHING

摘要：

The application of magnesium hydroxide in Ep stage as alkali source and in D2 stage as pH controlling agent, D1EpD2, was discussed in this paper. The efforts were focused on the differences between magnesium hydroxide-based and sodium hydroxide-based EpD2 bleaching process, and getting the optimal conditions of magnesium hydroxide-based EpD2 bleaching process. The results showed that, after Ep stage, both the NaOH-Ep stage and the Mg(OH)2-Ep stage can give the pulp 72％ ISO brightness, or higher. Compared with NaOH-Ep treatment, the Mg(OH)2Ep treatment can lead the pulp to a little lower brightness and strength properties, but the CODcr of the bleaching liquid can reduce by more than 50％. When Mg(OH)2 is used in final D2 stage, as pH controlling agent, in D1EpD2 bleaching process, compared with NaOH-based D2 bleaching, the Mg(OH)2based D2 bleaching can give the resultant pulp higher strength properties and lower brightness.

关键词： poplar kraft pulp sodium hydroxide magnesium hydroxide bleaching

作者: Lei Xu Hongdan Zhang Shoujuan Wang Lin Wei Fangong Kong Jiachuan Chen

作者单位: Key Laboratory of Pulp and Paper Science and Technology of Education Ministry of China, Shandong Pol State Key Laboratory of Pulp & Paper Engineering, South China University of Technology, Guangzhou 51 Jinan Yinxing Paper Company Limited, Jinan 250000, China

会议类型: 国际会议

会议名称: 16th International Symposium on Wood,Fiber and Pulping Chemistry(第十六届木材、纤维及制浆化学国际会议)

会议地点: 天津

会议语种:英文

页码: 756-760

在线出版日期: 2011-06-08（万方平台首次上网日期，不代表论文的发表时间）