Alternative Sodium Recovery Technology—High Hydroxide Leaching: FY10 Status Report

Mahoney, Lenna A. ; Neiner, Doinita ; Peterson, Reid A. ; Rapko, Brian M. ; Russell, Renee L. ; Schonewill, Philip P.

Pacific Northwest National Laboratory (U.S.)

关键词: Leaching;    Sodium Hydroxides;    Radioactive Waste Processing;    Dissolution;    Kinetics;   

DOI  :  10.2172/1004805
RP-ID  :  PNNL-20166
RP-ID  :  AC05-76RL01830
RP-ID  :  1004805

美国|英语

来源: UNT Digital Library

【 摘 要 】

Boehmite leaching tests were carried out at NaOH concentrations of 10 M and 12 M, temperatures of 85°C and 60°C, and a range of initial aluminate concentrations. These data, and data obtained during earlier 100°C tests using 1 M and 5 M NaOH, were used to establish the dependence of the boehmite dissolution rate on hydroxide concentration, temperature, and initial aluminate concentration. A semi-empirical kinetic model for boehmite leaching was fitted to the data and used to calculate the NaOH additions required for leaching at different hydroxide concentrations. The optimal NaOH concentration for boehmite leaching at 85°C was estimated, based on minimizing the amount of Na that had to be added in NaOH to produce a given boehmite conversion.