การผลิตแผ่นกรองซิลิกาจากแกลบ

Abstract

Fabrication of Silica-Membrane from rice husks was achieved in the following steps : boiling with 1 molar HCL for 3 h., incimneration at 600ํC 6 h. White particle of high silica was the product after combustion, milling and pressing in the pellet form, sintring at 1200ํC, 3h. The Silica-Membrane, 5.2-5.3 cm. in diameter and 5-6 mm. in thickness, with fine porosity having average pore size about 1.0-2.4 micron were performed. The study of the parameters were milling time 15, 30 and 45 min. and pressing pressure 1x106 and 3x106 Pa respectively. The porosity of Silica-Membrane were about 27-42%. From Scanning Electron Microscope (SEM), mean pore size of membrane was less than 12 micron and the resistance of filtration before use was about 15x103 to 50x103 cm-1. The correlation of Porosity (%Po), resistance of filtration before use (Rmo), Average particle size of silica (dp), and Pressing pressure (P) were %Po = 28.24exp (0.0128 dp - 0.06189) [%] Rmo = 77.6141 - 3.7522 dp + 4.5366 P)x107 [cm-1] 10.8 < dp <17.2 [micron] and 1 <p <3 [MPa]