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首页> 外文期刊>Appita >Using precipitated calcium carbonate (PCC) as an alkali source in D_1 and D_2 brightening of a hardwood kraft pulp
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Using precipitated calcium carbonate (PCC) as an alkali source in D_1 and D_2 brightening of a hardwood kraft pulp

机译：在硬木牛皮纸浆的D_1和D_2中使用沉淀碳酸钙（PCC）作为碱源

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摘要

An alkali source is needed to control the final pH of D_1 and D_2 stages in a conventional elemental chlorine free (ECF) chemical pulp bleaching sequence. This study evaluated the use of precipitated calcium carbonate (PCC) as an alternative alkali to caustic soda (NaOH) in the ClO_2 brightening of a hardwood kraft pulp. The PCC-based process showed improved brightening performance over the conventional NaOH-based process due to its lower initial pH and flat overall pH profile in the system. The pulp viscosity was also better than that of the control pulp. The PCC-based process can save up to 0.2% ClO_2 in achieving the same target brightness as the control. PCC was also evaluated as the alkaline source for the alkaline extraction stage and the results showed that the final pulp brightness decreased but the COD in the effluent also decreased. However, at a 20% PCC substitution in the alkaline extraction stage, with the combination of the PCC-based D_1 and D_2 stages, a fully bleached pulp with higher final brightness, less brightness reversion and better viscosity than the control can be produced.
机译：需要碱源来控制常规的无元素无氯（ECF）化学纸浆漂白过程中D_1和D_2级的最终pH。这项研究评估了在硬木牛皮纸浆的ClO_2增白中使用沉淀碳酸钙（PCC）作为苛性钠（NaOH）的替代碱。与传统的基于NaOH的方法相比，基于PCC的方法显示出更高的增白性能，这是因为其较低的初始pH和系统中总体pH值较低。纸浆粘度也优于对照纸浆。基于PCC的过程可节省多达0.2％的ClO_2，以实现与对照样品相同的目标亮度。 PCC还被评估为碱性提取阶段的碱性来源，结果表明最终的纸浆白度降低了，但废水中的COD也降低了。但是，在碱性萃取阶段PCC取代率为20％的情况下，与基于PCC的D_1和D_2阶段相结合，可以生产出完全漂白的纸浆，其最终白度更高，白度回复率更低，且粘度比对照纸更好。

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  • 来源
    《Appita》 |2010年第2期|p.126-130|共5页
  • 作者

    M. SARWAR JAHAN; YONGHAO NI; ZHIBIN HE;

  • 作者单位

    Pulp and Paper Research Division, BCSIR Laboratories, Dhaka, Dr. Qudrat-i-Khuda Road, Dhaka 1205, Bangladesh Limerick Pulp and Paper Research and Education Centre, University of New Brunswick, P.O. Box 4400 Fredericton, NB, Canada E3B 5A3;

    Limerick Pulp and Paper Research and Education Centre, University of New Brunswick, P.O. Box 4400 Fredericton, NB, Canada E3B 5A3;

    Limerick Pulp and Paper Research and Education Centre, University of New Brunswick, P.O. Box 4400 Fredericton, NB, Canada E3B 5A3;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    ECF bleaching; chlorine dioxide brightening; pH control; precipitated calcium carbonate (PCC); brightness; brightness reversion;

    机译：ECF漂白;二氧化氯增白;pH控制;沉淀碳酸钙（PCC）;亮度;亮度恢复;

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