Abstract
A new conductivity cell, developed previously, was employed from 15 to 250 °C, in an effort to investigate the inter-relation between the measured conductivities and the solution chemistry of high-temperature H2SO4−Al2(SO4)3 solutions. These electrolytes exist in the laterite leach slurry of the pressure acid leaching process. It was found that, at 250 °C, the effect of Al2(SO4)3 on conductivity decreases with increasing Al2(SO4)3. This is in agreement with our previous findings that aluminum mostly forms Al(SO4)+ at low molalities, whereas 85% of aluminum is associated as Al2(SO4)30 at near-saturation molalities. At 250 °C and constant H2SO4 molality, the solution conductivity drops with increasing Al2(SO4)3 molality. It is suggested that this drop is caused by a sharp decrease in ionic equivalent conductivities of H+, HSO4-, and Al(SO4)+. This drop was found to be similar in nature to the drop when H2SO4 is added at very low concentrations. A new unified correlation for ionic equivalent conductivity in terms of one-third power of individual ionic strength was found. Finally, a simple mixing rule was developed to calculate the ionic equivalent conductivities in H2SO4−Al2(SO4)3 solutions.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
