低品位氧化锌矿的浓硫酸焙烧

采用浓硫酸焙烧新工艺，提取低品位氧化锌矿中的锌、铁、铝.考查了反应温度、反应时间及酸矿摩尔比对低品位氧化锌矿中锌、铁、铝提取率的影响.利用扫描电镜(SEM)和X射线衍射分析仪(XRD)对熟料和尾渣的微观形貌进行了表征并分析了生成产物成分.在此基础上，通过正交试验，确定最佳反应条件.研究结果表明:最佳反应条件为反应温度6735K，反应时间120min，酸矿摩尔比16∶1.此时，锌的提取率可达9902%，铁、铝的提取率分别为2378%与7768%，硅、钙、铅等元素富集在渣中.

Roasting of Low Grade Zinc Oxide Ore by Concentrated Sulfuric Acid

Zn， Fe and Al were extracted from low grade zinc oxide ore obtained from China by the new technique of concentrated sulfuric acid roasting. The effects of reaction temperature， reaction time and molar ratio of acid to ore on extraction rate of Zn， Fe， Al were investigated. Microstructures and components of the zinc calcine and tailing were characterized by scanning electron microscope (SEM) and X ray diffraction (XRD) analyzer. On the basis， the optimum reaction condition was obtained through orthogonal tests. Results showed that the extraction rates of Zn， Fe and Al were 9902%， 2378% and 7768% respectively， when the ores were roasted for 120min at 6735K and molar ratio of acid to ore was 16∶1. The elements of Si， Ca and Pb were enriched in the residue.