Experiment was discovered: the impurity of the alloy billet produced by direct resistance sintering was lower, than by activated sintering and medium-frequency induction sintering.
试验发现：垂熔烧结可获得较低杂质含量的合金坯料，活化烧结和中频感应烧结获得的坯料杂质含量较高。
2
Using zinc oxide mine as a raw material, activated zinc oxide can be produced by ammonia leaching, getting rid of impurity, depositing zinc, drying and calcining.