Sulphur recovery from low grade ore has been achieved by solvent extraction method, in a differential, continuous extractor. The mathematical models, describing the differential extraction, have been adapted by attributing numerical values to its parameters. Additional measurements for equilibrium characteristics are needed. Simulations have been performed to study the influence of temperature, liquid/solid ratio and conveyer speed on the extraction efficiency. The results, represented in graphs, illustrating the correlation between the extraction efficiency and the working parameters are in good agreement with the experimental data.