Gilberto Rinaldi

Fluoride Removal from Water by Adsorption on a High Alumina Content Bauxite

Drinking water contamination by fluoride is recognized as a major public health problem in many parts of the world. In fact, although fluoride is an essential trace element for animals and humans, excessive fluoride intake may cause adverse health effects. In this study we investigated the potential of a natural, high alumina content, bauxite for the removal of fluoride from contaminated water. Both batch and continuous experiments were performed. In continuous-flow column experiments, the effects of inlet fluoride concentration (5–50 mg L

Behaviour of polyaminophenolic additives in the granulation of lime and fly-ash

Abstract Room temperature granulation of fly-ash generated from incineration of municipal solid wastes (MSW) was achieved by mixing the ash with lime, water and three polyaminophenolic additives in a rotating drum. The presence of the additives favours the carbonation of lime, thus accelerating and enhancing the development of short-term compressive strength of the granules; this ensures there is no need to cure the pastes in CO 2 -enriched or heated atmospheres. After curing in air for 30, 45, 60 and 90 days, the granules were evaluated by unconfined compressive strength tests. The strengths achieved shortly after granulation allow safe transportation and storage of the granules and are similar to the strengths of the light granulates used for building purposes.

Poly-Amino-Phenolic Additives Accelerating the Carbonation of Hydrated Lime in Mortar

Preliminary tests were carried out to evaluate the influence of poly-amino-phenolic (PAP) oligomers on the absorption of CO2 from air into aqueous saturated solution of Ca(OH)2. Further experiments were then conducted by employing the best additive (PAP2), to facilitate the carbonation of hydrated lime mortars and to identify the most favorable additive content. Mechanical tests and results obtained by infrared spectra suggests that this additive behaves better in accepting, transferring, and giving up CO2 to the lime.

Modified-Amine Cured Epoxy Formulation For The Encapsulation Of Electronic Circuits

The chemical modification of a polyalkylene-polyamine by reaction with phenol and formaldehyde allowed the obtainment of a series of curing agents tailored for an epoxy formulation suitable for the “conformal coating” of electronic assemblies. The mechanical, physical and above all electrical properties and durability of the coatings were measured; the presence of inorganic fillers (quartz and mica) into the formulation was also experimented with satisfactory results.