Control of Deposits and Porous Properties of Hydrothermally Solidified Materials Using Clays

Abstract

We examined the addition of quartz to powder compacts consisting of kaolinite and slaked lime to determine the influence of quartz addition on the deposition and porous structure of solidified materials treated by a hydrothermal process. After hydrothermal treatment, hydrogarnet formed in the solidified materials, and hydrogarnet formation was independent of the addition of quartz to the powder compacts. The amount of hydrogarnet in the hydrothermally solidified materials with quartz as a starting material was higher than that in the materials without quartz. The porosity of the hydrothermally solidified materials depended on the amount of hydrogarnet. A different degree of hydration was observed for hydrogarnet in the hydrothermally solidified samples derived from powder compacts with and without quartz. The degree of hydration played an important role in hydrogarnet shape.

Nature Technology for the Creation of Innovative Life

“…The deposits formed between particles in powder compacts enhance the strength of hydrothermally solidified materials of a CaOeSiO 2 eAl 2 O 3 eH 2 O system [24]. The space associated with each fine-sized deposit was suggested to cause the formation of mesopores [25]. The formation of new deposits on its surface during hydrothermal reaction would play an important role in the solidification of allophane.…”