PDMDAAC改性高炉渣及其性能和应用研究

【作者】 许鹏举；

【导师】 岳钦艳；

【作者基本信息】 山东大学 ， 环境工程， 2006， 硕士

【摘要】 本论文以钢铁工业中主要固体废弃物——水淬高炉渣和一种工业生产中常用的絮凝剂——聚二甲基二烯丙基氯化铵(PDMDAAC)为原料，采用水溶液吸附的方法合成了PDMDAAC改性高炉渣。考虑改性时改性剂PDMDAAC的浓度、吸附时间、温度等的影响，对水淬高炉渣进行了改性。用多种分析方法和现代测试技术，对改性高炉渣的性能进行了研究。采用水溶液吸附的方法制备出一系列的改性高炉渣，用激光粒度散射仪测定了不同条件下改性高炉渣的粒度分布情况，用电泳技术研究了原高炉渣和改性后高炉渣在水溶液中颗粒表面的电化学特性以及影响因素，探讨了改性高炉渣的电性和应用效果之间的关系，并用扫描电镜技术观察和研究了改性高炉渣的结构和形貌特征，并与原高炉渣作了比较。最后，通过对模拟印染废水、实际印染废水、含酚废水、苯胺废水等废水的处理，研究了改性高炉渣对各种废水的处理效果，以及在废水处理中的最优条件和影响因素。根据废水处理效果，结合对PDMDAAC吸附量的研究，确定出改性高炉渣的最佳改性工艺和生产配方，以生产出处理效果好、成本低的改性高炉渣。 通过重点对分散蓝S-BL、活性翠蓝K-GL和活性艳红K-2BP三种有代表性染料模拟废水的脱色研究，结合PDMDAAC在高炉渣颗粒表面的吸附量的研究，重点考察了改性工艺中最有可能影响改性高炉渣产品效果的PDMDAAC溶液浓度、改性时间和水浴温度三个因素，从而确定了最佳改性工艺条件。最佳改性工艺条件为：PDMDAAC水溶液的浓度为3％，搅拌时间120min，水浴温度60℃。考察了处理模拟染料废水时投加量、pH、温度和反应时间等因素对处理效果的影响。结果表明，与原渣相比，高炉渣的PDMDAAC表面改性大大提高了其处理分散染料和活性染料的能力。其中，对于分散染料的处理效果优于对活性颜料的处理效果。对于粒度的分析表明，经过改性，高炉渣粒度没有发生明显变化。为电泳技术测定，高炉渣原渣颗粒表面带负电荷，吸附一定量的PDMDAAC后带正电荷，并探讨了PDMDAAC吸附量与Zeta电位的关系。扫描电镜的研究表明，高炉渣颗粒改性前后形状没有发生变化，但是，吸附PDMDAAC后的表面更多还原

【Abstract】 PDMDAAC modified blast furnace slag(BF slag) was prepared by a method of solution adsorption. The PDMDAAC (poly dimethydiallylammonium chloride) was a kind of common flocculation, and the quenching blast furnace slag is the main solid waste of steel industry. The quenching BF slag was modified under different concentration of PDMDAAC, adsorption time and temperature. The performance of the modified BF slag was characterized by some modern testing technologies and analysis methods. The diameter distribution of modified BF slag was measured by laser particle analysis system.According to the study of PDMDAAC adsorption on the surface of BF slag particles and the decoloring study of simulation wastewater with dispersed blue S-BL, reactive blue K-GL and reactive red K-2BP, concentration, modified time, and temperature of water bath of PDMDAAC which are more likely to influence the effect of modified slag in the modified technics are mainly reviewed, and then the optimal condition of modified technics was decided. The optimal condition of modified technics is that the concentration of PDMDAAC is 3%, the time of milling is 120min and the temperature of water bath is 60℃. The quantity of BF slag in the simulation of coloring waste water, pH, temperature, and reaction time were also reviewed to the influence of disposal. The results shown that, PDMDAAC of slag enhances more disposal capacity of decentralization dye and active dye than original dregs and the disposal effect of decentralization dye is better than that of active dye. The analysis of granularity shows that granularity of BF slag did not change much after modified. The surface of the BF slag adsorbed some minus charge but adsorbed some positive charge after adsorbed PDMDAAC according to the electrophoresis. The relation of the adsorption of PDMDAAC and Zeta potential was studied. The morphology of modified BF slag did not change compared with BF slag, but the surface morphology changed after adsorb PDMDAAC, which became more coarse. There is a PDMDAAC更多还原