in this research, a sol gel autocaombustion route has been proposedto synthesize alumina-zirconia composite powders, usingammonium bicarbonate as a new fuel. then the effect of calcinationtemperature on phase transformation and crystallite sizes wasinvestigated. to characterize the products xrd, tem and betanalyses were used. xrd patterns of as-synthesized powder andcalcined powders at 1100 ◦c ...

A 2D axisymmetric computational fluid dynamics (CFD) model, coupled to a 1D bed has been developed capture the key processes that occur within rotary lime kilns. The model simulates calcination reaction using shrinking core and predicts start of degree at end kiln. heat transfer due radiation, convection conduction between gas, wall, chains, bed. gas models are by mass sinks simulate transfer, ...

We precipitated thorium in a two-step process with ammonia and carbonates. In contrast to single step or carbonate precipitation, the precipitates >99.9% of Th removes >99.5% Ra alongside. Filterability is strongly affected by pH variations step, under well-controlled conditions, ThO2 filters quickly calcines crystalline at low temperatures. As-precipitated contains significant quantities adsor...

LiMn(2)O(4-y)Br(y) nanoparticles were synthesized successfully for the first time by a room temperature solid-state coordination method. X-ray diffractometry patterns indicated that the LiMn(2)O(4-y)Br(y) powders were well-crystallized pure spinel phase. Transmission electron microscopy images showed that the LiMn(2)O(4-y)Br(y) powders consisted of small and uniform nanosized particles. Synthes...

MgO is an important inorganic material, which can be used in many aspects, such as catalyst, toxic-waste remediation agent, adsorbent, and others. In order to make use of MgO, nano-MgO was prepared by ultrasonic method using Mg (CH3COO)2.2H2O as precursor, NaOH aqueous solution as precipitant in this paper. Effect factors on MgO nano-particle size were investigated. Characteristics of samples w...

The liquid phase oxidation of benzyl alcohol is an important reaction for generating benzaldehyde and benzoic acid that are largely required in the perfumery and pharmaceutical industries. The current production systems suffer from either low conversion or over oxidation. From the viewpoint of economy efficiency and environmental demand, we are aiming to develop new high-performance and cost-ef...

In this report, functional one-dimensional (1-D) Pt-Co3O4 heterostructures with enhanced electrochemical properties were synthesized via colloidal polymerization of polymer-coated ferromagnetic cobalt nanoparticles (PS-CoNPs). Colloidal polymerization of dipolar nanoparticles into hollow metal-semiconductor nanowires was achieved via a consecutive galvanic replacement reaction between Co and Pt...

In this work we have tested the fluidized bed desulfurization performance of lime particles obtained by means of a proprietary limestone slow calcination pre-treatment technique. This performance was compared to that of the parent untreated limestone particles. The occurrence of particle fragmentation and attrition during the fluidized bed operation was also investigated with a specific test pr...

Zeolites Na-A and Na-X are important synthetic zeolites widely used for separation and adsorption in industry. It is of great significance to develop energy-efficient routines that can synthesize zeolites Na-A and Na-X from low-cost raw materials. Coal fly ash (CFA) is the major residue from the combustion of coal and biomass containing more than 85% SiO2 and Al2O3, which can readily replace th...