Properties of electrolyte solutions relevant to high concentration chloride leaching.: II.: Density, viscosity and heat capacity of mixed aqueous solutions of magnesium chloride and nickel chloride measured to 90 °C

Results of density and viscosity measurements for aqueous solutions of MgCl2 (0.5-3.5 mol L-1) and MgCl2 + 10% NiCl2 (0.5-3.5 mol L-1) at temperatures of 25, 60 and 90 degrees C show an almost linear increase in density with total concentration, while low nickel contents and temperature have comparatively small effects. Viscosities of MgCl2 solutions rise sharply at 25 degrees C but are significantly lower at 90 degrees C. The viscosity of 3-4 mol kg(-1) MgCl2 at 90 degrees C is similar to water at 25 degrees C. Nickel has no significant effect on the viscosity of these solutions. Results of heat capacity measurements for aqueous solutions of MgCl2 (0.5-3.5 mol L-1) and MgCl2 + 10% NiCl2 (0.5-3.5 mol L-1) at temperatures of 60 and 90 degrees C show that the heat capacities of these solution decrease significantly with total concentration, while the effects of low nickel contents and temperature are again comparatively small. (c) 2007 Elsevier B.V. All rights reserved.