Thermodynamic behaviour of complex antimonite ore for electrodeposition of metal value

This paper outlines the hydrometallurgical processing and the various possible approaches for the recovery of metallic antimony from its antimonite sulphide ore by electrolysis. Thermodynamic calculations have been made to find the optimum conditions for roasting and/or sulphate roasting of Wadi Abu Quraiya antimonite ore, The antimonite ore (Sb2S3) is roasted directly without concentration and large savings in reagent and chemical processes are expected. A suitable roasting temperature of 1200 K for 4 hours has been determined. Metallic antimony is cathodically electrodeposited with a high current efficiency at current densities of 350 to 500 A/m2 depending on the composition of leach liquor solutions. The results of the electron microscopy investigation confirmed by metal value data in the ASTM cards are in good agreement with the chemical analysis

Tribological study of OH- and N-containing imidazoline derivatives as additives in water–glycol

Tribological properties of two hydroxyl- and only active nitrogen-containing water-soluble imidazoline derivatives, benzotriazole-containing imidazoline (BML) and caprylic acid-containing imidazoline (CML), as lubrication additive in water–glycol hydraulic fluid were evaluated with a four-ball tester. And the antirust and anticorrosion behaviors were also investigated. Results show that BML and CML were able to remarkably improve the antirust properties of water–glycol fluid when added at a low adding concentration, and also these performances of BML was better than CML. All additives exhibited good extreme pressure and antiwear properties, and BML showed better tribological properties than CML. Besides, the difference in the tribological and anticorrosion properties of these derivatives was closely related to their different molecular structures. There exists a synergistic tribological effect between benzotriazole and imidazoline group in the tribological and antiwear performances. Furthermore, significant improvement in the tribological performances of BML was detected and attributed to organic nitrogen compounds, iron oxide, and so on in tribofilm on the worn surfaces