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雄黄为硫化物类矿石,呈不规则块状,主含二硫化二砷(AS_2S_2),《中国药典》要求研成极细粉或水飞。目前生产厂家都使用粉碎机或球磨机进行加工。由于粉碎机高速旋转,发出高热,雄黄受热容易氧化,产生AS_2O_3有使后者含量增高,毒性增加的危险。用水飞法加工雄黄,因为AS_2O_3溶于水,能降低矿石内原有的AS_2O_3含量,保证了安全用药目的。但人工水飞,费时费力,劳动强度大,生产效率低,为克服这些缺点,我厂新购进一台北京市
Realgar is a sulphide ore that is irregularly shaped and contains mainly arsenic disulfide (AS_2S_2). The Chinese Pharmacopoeia requires the development of very fine powder or fly. Current manufacturers use crushers or ball mills for processing. As the pulverizer rotates at a high speed and emits high heat, realgar is easily oxidized by heat, and the production of AS_2O_3 increases the latter’s content and increases the risk of toxicity. The realgar is processed by water-floating method because AS_2O_3 dissolves in water and can reduce the original AS_2O_3 content in the ore and ensure the safe use of the drug. However, due to artificial water, it takes time and effort, labor intensity, and low production efficiency. In order to overcome these shortcomings, we have purchased a new factory in Beijing.