... strong structure, stable operation rotary waelz kiln 1.more safe for workers 2.low consumption 3.professional 4.ISO,CE,OEM ... , low grade zinc ore etc. The rotary kiln process for ZnO Production from Zn-bearing materials will includes 1,Raw ... efficient shaft preheaters and five grade cyclone preheaters. Technical parameters: Model(m)Technical dataReduction driveSpeed(r/min)slope(%)capacity(t/h)typeratio ...