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An analytical investigation of a 2D-PPMs hollow infinite cylinder under thermo-electro-mechanical (TEM) loadings

Meshkini M., Firoozbakhsh K., Jabbari M., SelkGhafari A.

Journal of Theoretical and Applied Mechanics

2018

Vol. 56 nr 1

107--122

The analytical solution of steady-state asymmetric thermo-electro-mechanical loads of a hollow thick infinite cylinder made of porous piezoelectric materials (2D-PPMs) based on two-dimensional equations of thermoelasticity is considered. The general form of thermal and mechanical boundary conditions is considered on the inside and outside surfaces. A direct method is used to solve the heat conduction equation and the non-homogenous system of partial differential Navier equations using the complex Fourier series and the powerexponential law functions method. The material properties are assumed to depend on the radial and circumferential variable and are expressed as power-exponential law functions along the radial and circumferential direction.

Leaching of zinc from low grade oxide ore using organic acid

Irannajad M., Meshkini M., Azadmehr A. R.

Physicochemical Problems of Mineral Processing

2013

Vol. 49, iss. 2

547--555

The leaching of low grade zinc oxide mining tailings by organic acid as a leaching agent was investigated. Zinc was extracted successfully from sample by citric acid leaching. The effects of solid-to- liquid ratio, acid concentration, reaction time, temperature and ore particle size on the leaching efficiency were studied. The results obtained showed that particle sizes and reaction time had not any significant effect on the leaching recovery of zinc from smithsonite in the sizes range of 40-350 μm. Under conditions: temperature of 80ºC, reaction time of 60 min, citric acid concentration of 0.5 mol/L, and solid to liquid ratio of 1:10, 82% of zinc could be recovered.