Modeling gas release from a Bingham plastic slurry and deconvoluting measured data

•Performed lattice-Boltzmann computational fluid dynamics simulations of retained hydrogen gas release from Bingham plastic slurries.•Performed sensitivity analyses to evaluate the impact of yield stress, impeller speed, and bubble size on the release of retained gas from a Bingham plastic slurry.•Compared lattice-Boltzmann computational fluid dynamics simulations of retained hydrogen gas release from Bingham plastic slurries with experimental data. Physics-based models for predicting the off-gassing characteristics of agitated slurries are presented. This approach decomposes the system into two separate but coupled slurry and headspace models. The physics driving bubble transport through the slurry and gas mixing within the headspace are discussed. An analytical expression for predicting the time evolution of the headspace concentration using first principles theory is also presented. Predictions from the numerical models, as well as expectations from the analytical solution, both agree with measured off gassing data for two different experimental operating conditions. After benchmarking the numerical model predictions against experimental data, the model was used to make predictions for gas release from a full-scale vessel and to perform sensitivity analyses to examine the sensitivity of gas release to parameters such as yield stress, consistency index, slurry density, bubble size, bubble concentration, and impeller speed.