This article describes the application of the updraft biomass gasifier in the non-ferrous metal smelting system. Solving the severe corrosion problem of graphite-SiC crucibles is the purpose of this study, with special emphasis on influence and control to the crucible corrosion caused by the migration of alkali metals, which are usually richest in the biomass. XRD and SEM-EDX analysis of the crucibles showed that compared with the original, K and O in the crucible increased markedly when using the burning engine as a heat source. However, only O in the crucible increased significantly when the updraft gasifier was used as the heat source. It illustrates that the updraft gasifier with the biomass as fuel has a unique filter retention effect on the volatile alkali metals, which can solve the corrosion issue of graphite-SiC crucibles.