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首页> 外文期刊>Separation and Purification Technology >Separation of clay suspension by ionic dextran derivatives
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Separation of clay suspension by ionic dextran derivatives

机译：离子葡聚糖衍生物分离粘土悬浮液

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摘要

Separation studies of a clay suspension model using some cationic polysaccharides were performed by turbidity and zeta potential measurements. Floe size measurements at the optimum polycation dose were also carried out using laser diffraction technology. The investigated polyelectrolytes contained various amounts of quaternary ammonium salt groups, N-ethyl-N,N-dimethyl-2-hydroxypropyl ammonium chloride, attached to a dextran backbone. The flocculation efficiency was studied as a function of the polycation charge density and some flocculation parameters (polycation dose, settling time, parent solution concentration of polymer). All investigated cationic polysaccharides showed high flocculating efficiency at optimum flocculant doses that correlated well with the charge density of polycations: the higher charge density, the lower amount of dextran derivative was required for reaching the maximum clarity degree (of about 100%). This finding together with the negative value of the zeta potential at the optimum polymer dose, point to contributions from both neutralization and patch mechanisms for flocculation process. The residual turbidity values also varied with the settling time and parent solution concentration of polymer. Possible reasons for these dependences have been discussed. A slight increase of the floe size with increasing charge density and unimodal distribution in floe size were also observed.
机译：通过浊度和ζ电势测量对使用某些阳离子多糖的粘土悬浮液模型进行了分离研究。还使用激光衍射技术在最佳聚阳离子剂量下进行了浮选。研究的聚电解质含有各种数量的季铵盐基团，N-乙基-N，N-二甲基-2-羟丙基氯化铵，连接到葡聚糖骨架上。研究了絮凝效率与聚阳离子电荷密度和一些絮凝参数（聚阳离子剂量，沉降时间，聚合物母液浓度）的关系。所有研究的阳离子多糖在最佳絮凝剂剂量下均显示出高絮凝效率，而絮凝剂剂量与聚阳离子的电荷密度密切相关：电荷密度越高，达到最大澄清度（约100％）所需的葡聚糖衍生物量越少。这一发现与最佳聚合物剂量下zeta电位的负值一起表明，絮凝过程既来自中和作用也来自补丁机制。残留浊度值也随沉降时间和聚合物母液浓度而变化。已经讨论了这些依赖性的可能原因。还观察到絮凝物尺寸随电荷密度和单峰分布的增加而略有增加。

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