تحضير ودراسة المرشحات وحواملها انطلاقـا من الكولان وكربونات الكالسيوم

Abstract

In this work, both supports for ceramics membranes and membranes have been prepared from local raw materials such as kaolin DD2 and calcium carbonates. These supports were made by extrusion technique in order to obtain tubular supports which were afterwards sintered at different temperatures. It have been found that supports sintered at different temperatures interesting characteristics; of porosities ratio around 55%. Moreover, there pore sizes distributions are almost homogeneous (mono-modal type). These supports were selected to be substrates for the membrane layers used in micro-filtration (MF). The membrane layers were elaborated from titanium oxide, using slip casting technique. The specimens were subsequently sintered at 11 00 °C. The microstructure and porosity as well as the permeability have been also studied. It has been found that the average pore size is about 0.37 m and a layer thickness ≈ 22.7 m. These membranes are also used as supports for ultrafiltration (UF). The membrane layers of these later were also elaborated from zirconium oxide (ZrO2) with author diameters, using slip casting technique. The specimens were subsequently sintered at 700 °C. The microstructure and porosity as well as the permeability have been also studied. It has been found that the average pore size is about 0.1 µm, the water permeability measured is about 360 l/h.m2.bar. Shear threshold is estimated at about 100,000 Dalton . A further important application in this work is waste and hard waters purification using membranes technique.