スラグウールによる超微粒シリカの分離 -界面特性を利用した超微粒子希薄懸濁液の迅速固液分離(第1報)-

概要

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Rapid solid/liquid separation from dilute colloidal dispersions is one of the most difficult techniques and effective method has yet to be established so far. But by using the electro-interfacial properties of colloidal particles, effective fine particle removal from dilute suspensions was made possible in a simple way. In this experiment, rapid separation of ultra fine silica particles (mean diameter of 200 nm) crystallized from geothermal water were investigated by using a column bed method packed with ferro-nickel fibrous slag wool, which was made as waste material from Fe-Ni electrosmelting process. Collection efficiency of silica particles was highly dependent on chemical characteristics of suspension, that is, pH and ionic strength：better separation was attained in more acidic condition and higher KNO3 electrolyte concentration. These experimental results were generally in agreement with the heterocoagulation theory. It could be concluded that surface interactions between particle and collector virtually determined the total removal capacity of collector bed.
1999-01-25