Ricerc@Sapienza

Chalcopyrite leaching in acidic ferric sulfate media at ambient temperature exhibits slow kinetics due to the formation of passivation layers on chalcopyrite surfaces. In this study, we investigated the use of potassium iodide to assist chalcopyrite leaching and proposed mechanisms by which iodide enhanced the leaching efficiency. The effect of ferric concentration, temperature and iodide concentration on chalcopyrite leaching was studied by factorial experimental design and statistical analysis of data using the analysis of variance (ANOVA) method.

The synthesis of thiobenzamides from benzaldehydes, elemental
sulfur and cyclic secondary amines was carried out by
Willgerodt-Kindler reaction following three different protocols,
avoiding the harsh conditions usually reported in the literature.
Protocol A was solventless, protocol B was in acetonitrile, while
protocol C was electrochemical in acetonitrile (using electrogenerated
acetonitrile anion). For all protocols the temperature
was 60 8C. In all cases, a stoichiometric amount of reagents was