Production of Zeolite from Rice Husk Ash

Abstract

The use of waste to development of products has been an increasingly routine practice today. In this work was used rice husk ash from combustion boiler for energy for synthesis of sodium silicate. The silicate was obtained by means of ash fusion with sodium hydroxide at a temperature of 1200°C for 2 hours. For the synthesis of 4A-zeolite was performed hydrothermal reaction of sodium silicate, previously obtained with sodium aluminate and sodium hydroxide. The zeolite obtained was characterized by X-ray fluorescence, X-ray diffraction and scanning electron microscopy. The results have indicated the formation of 4A-zeolite.

Synergistic Effect of 4A Zeolite from Rice Husk Ash without Aging Time and Silane on the Adhesion Properties of a Warm Mix Asphalt

“…35 There are numerous studies that synthesize LTA zeolites hydrothermally using RHA as a raw material; unfortunately, after obtaining the amorphous silica, the preparation of the silicate solution implies high temperatures and long periods of time. 32,[36][37][38][39][40][41] For example, the process has been reported using temperatures from over 70 °C to the boiling point, and periods range from 1 h to one week under shaking or stirring conditions. 32,36,38,40,41 Once this process is complete, a gel solution is prepared by mixing the silicate solution with sodium aluminate solution.…”

“…This is followed by the application of crystallization conditions, the time and temperature vary from over 2 to 48 h at a temperature of approximately 100 °C. 32,33,[36][37][38][39][40][41][42] Zeolite crystallization reactions can be caused by a conventional hydrothermal synthesis and through a microwave-assisted hydrothermal synthesis. 43 The latter has been reported to offer advantages, such as decrease of the crystallization time, 14,27,[43][44][45][46][47] narrowing the particle size distribution and increase of the shape homogeneity.…”