CALCULATION OF AN APPARATUS FOR LEACHING A SOLUBLE IMPURITY FROM A DENSE MOVING-BED OF A GRAINY MATERIAL

A method is presented for calculating the dimensions of a column appar atus and the process parameters of continuous counterflow leaching of a soluble impurity in a dense moving bed of an inert polydisperse mate rial. The kinetics of leaching is modeled in the approximation of the diffusion model of longitudinal mixing. A method for solving the probl em is demonstrated, taking into account the longitudinal mixing of the solution in the bed, the polydispersity of solid particles, and the v ariation of the mass-exchange rate along the vertical extent of the ap paratus. The adequacy of the model is verified experimentally in a lab oratory apparatus 0.207 nt in diameter and 3.0 m in height.