?-Calcium sulfate hemihydrate (?-HH) is an important cementitious material, which can be prepared by hydrothermal method from calcium dihydrate (DH) in electrolyte solution. Study of the conversion kinetics DH to ?-HH NaCl solution helpful for understanding control process. In this paper, X-ray diffraction (XRD) patterns were applied study effect temperature on crystallization determine kinetic...

Abstract A novel, simple and efficient anhydrous MgCO 3 (AMC) synthesis method using ascorbic acid (ASA) has been developed based on the hydrothermal carbonization. In this process, ASA acts as both a CO 2 source crystal modifier to regulate control crystallization of AMC. Furan derivatives, aldehydes ketones from play an unexpected role structure-directing agent. The effect pH values ASA, reac...

Nano-zirconia exhibits excellent mechanical properties (fracture toughness, hardness and flexural strength), thermal performance (thermal conductivity), optical biological for various ceramic-based applications. Supercritical hydrothermal synthesis technology is an advanced environmental-friendly method preparing nanoscale powders. In this paper, the formation crystallization of nano-zirconia d...

With the rapid development of alumina industry and shortage bauxite, high-alumina coal fly ash (HACFA) has attracted more attention as a potential alternative resource. In order to extract from HACFA with newly developed technology, investigation crucial step, reaction between NH4Al(SO4)2·12H2O NH3·H2O, is necessary valuable. Thermodynamic analyses have shown that four kinds hydrate (boehmite, ...

Applications of zeolite membranes in separation, chemical sensors, and catalytic membrane reactors have led to extensive studies on their fabrication. To date, mainly silicatebased zeolite membranes of the structure types MFI, DDR, LTA, and FAU have been synthesized on different substrates and evaluated for singleor multiple-gas permeation. Routes for the synthesis of zeolite membranes can be b...

Hydrothermal precipitates associated with active vents in the eastern Manus back-arc basin, Papua New Guinea, are among the most gold rich yet discovered on the modern sea floor. The volcanic rocks associated with this mineralization were investigated to determine if they are sufficiently enriched in gold to account for the gold content of the sulfides by simple leaching and to determine whethe...

Greisenization is typically linked with highly fractionated granites and often associated hydrothermal vein systems. Late to postmagmatic metasomatic processes involve the enrichment of volatile components such as boron halogens well several metallic elements. The purpose this study reveal main effects paragenetic sequences related mineralizations in Highiş granitoids, Romania. In a natural out...

Over the years, many strategies have been developed to address the problem of sintering of nanoparticle catalysts, including encapsulating metal nanoparticles in protective shells, and trapping nanoparticles in the cavities of certain zeolites in post-synthesis steps. In general, materials that contain metal nanoparticles that are only accessible via zeolite micropores are intriguing, specifica...