利用铅冶炼烟尘制备超细氧化铅粉末

河南某底吹炉炼铅烟尘Pb含量达44.99%,可作为生产高质量超微细氧化铅粉末的重要资源。试验采用硫酸化焙烧预处理—NaCl浸出酸浸渣—氧化铅前驱体合成—氧化铅粉末生成工艺对超微细氧化铅粉末加工技术条件进行了研究。结果表明:试验确定条件下硫酸化焙烧预处理—水浸工艺的Pb、Cd、As去除率分别达2.67%、96.98%、100.00%,初步实现了铅与镉、砷等杂质元素的分离;NaCl浸出酸浸渣工艺的铅、镉作业浸出率为97.89%和98.12%;氧化铅前驱体合成工艺的铅转换率为97.88%;氧化铅粉末生成工艺彻底改变了晶体的形貌,生成物具有短棒状海绵疏松的微观形貌,长度小于2μm,氧化铅含量达98.31%,属优质超细氧化铅粉末。因此,该工艺为铅冶炼烟尘的回收和超细氧化铅粉末的制造提供了一种新的思路。

Preparation of Ultrafine PbO Powders with Lead Smelting Dust

A lead dust of bottom blowing furnace，Henan province，contains Pb 44.99%，which can be used as significant resource for preparing high quality ultrafine PbO powders.The optimal technological condition for preparing ultrafine PbO powders are investigated by adopting the process of sulfuric acid roasting-sodium chloride leaching-lead oxide precursor synthesis-generation of lead oxide powder.The results showed that the removing rate of Pb，Cd，As reached 2.67%，96.98%，100.00% through the process of pre-treatment of sulfuric acid roasting-water leaching process，preliminarily removing the impurities of Pb，Cd，As.The leaching rate of Pb and Cd were 97.89% and 98.12% separately by sodium chloride leaching acid process.The conversion rate of Pb was 97.88% by PbO precursor synthesis process.The product crystal morphology was thoroughly changed during generation process of PbO powder，and the product had short clavite sponge porous microstructure，with length of less than 2 μm and PbO of 98.31%，which is considered as high quality of ultrafine PbO powders.To sum up，this process provides a new idea for recycling of lead dust and preparation of ultrafine PbO powders.