1. The processing method for bismuth-tellurium concentrate was pyrometallurgy traditionally.

2. The process treating roast dust from zinc pyrometallurgy is, in general, the second roasting by rotary kiln.

3. The principle of metallurgical of ferromanganese silicon and the influences slag composition on pyrometallurgy performance of slag have preliminary studied.

4. A computer method for all-equilibrium calculation of a heterogeneous system for pyrometallurgy is developed in this work.

5. On the basis of analyzing the slaggy properties, the reason- able range of slaggy composition for pyrometallurgy enrichment of low grade lead-zinc oxide ore containing germanium is determined.