制浆造纸黑液碱回收新工艺及其分析研究

【作者】 代军；

【导师】 侯曼玲；

【作者基本信息】 中南大学 ， 分析化学， 2003， 硕士

【摘要】 本论文研究了两种适合中小型造纸厂黑液治理的方法，一种是物理-化学碱回收法，另一种是电化学碱回收法。 物理-化学碱回收法是利用回收碱治理草浆黑液并利用回收碱进行循环制浆。本研究通过实验确定了酸化、苛化的适宜条件：酸化时pH为3.0左右，温度为60℃且恒温水浴15min，加酸速度为中速且控制不产生大量泡沫，苛化温度为70℃，氧化钙用量为20.34 g／L，确定了较佳循环次数为三次，验证了该法的可行性和效果。 电化学碱回收法是利用直流电源对草浆黑液进行电解并回收残碱。本研究通过实验确定了最佳电解电流和电压及电解时间：电流I=1.0A，电压U=8.0V，电解时间T=12h。在最佳电流和电压条件下对草浆黑液电解12h，实验结果表明，黑液经电解处理后能有效降低污染，碱回收率较高。 此外，本论文还研究了利用黑液酸析木质素制备木素季胺盐絮凝剂，通过条件实验得出了合成该絮凝剂的较佳工艺条件，并利用自制絮凝剂对生活污水进行了处理，获得了较满意的效果。更多还原

【Abstract】 In this paper,two methods of treating black liquor for small or middle paper manufature factory were studied.One of the methods is physical chemisty alkali recovery,the other is electrochemistry alkali recovery.The method of physical chemisty alkali recovery is using recovery alkali not only to treat black liquor of straw pulp but also to make pulp circularly. The fitting condition of acid and alkali treatment was found by experiment in this study:when treated with acid,pH is about 3.0,the temperature is 60 ℃ and keeping to be heated by water for 15 minutes at this temperature,the speed of adding acid is middle,thus it would not bring much foam when adding acid;when treated with alkali,the temperature is 70℃,the dosage of CaO is 20.34g/L. The better times of circulation was also found in this study:it is 3 times. The feasibility and effect of the method was validated.The method of electrochemistry alkali recovery is to electrolyze black liquor of straw pulp by direct current electrical source and recovery residual alkali. The best current , voltage and time of electrolyse was found by experiment in this study :I=1.0A,U=8.0V,T=12h.Then treating black liquor by direct current on this condition for 12 hours,the experiment result showed that the black liquor pollution could be reducedeffectively, high alkali recovery rate was gained.Inadditional, using lignin separated out from black liquor to make lignin-qitaternary amic salt flocculant was studied in this paper.The better technical condition of synthesizing it was gained by conditional experiment.Utilizing self-made flocculant to treat living wastewater ,the effect of treatment is satisfactory.更多还原