微波碱性焙烧—水溶含锗氧化锌烟尘回收锗

Recovery Germanium by Microwave Alkaline Roasting-water Dissolving from Zinc Oxide Dust Bearing Germanium

摘要: 提出了微波碱性焙烧—水溶含锗氧化锌烟尘的新工艺，研究了配碱比、熟化时间、微波焙烧温度、液固比、水溶温度等对锗浸出率的影响规律。结果表明：在配碱比1 g·g^-1、熟化时间5 d、微波焙烧温度400 ℃、保温时间10 min、液固比5 mL/g和水溶温度70 ℃时，锗的最佳浸出率为91.15%，与现有的常规碱性焙烧含锗氧化锌烟尘工艺对比可知，碱性焙烧温度从950~1 100 ℃降低至400 ℃，碱性焙烧保温时间由1~4 h降低至10 min，锗浸出率由80.35%提高至91.15%。

Abstract: Microwave alkaline roasting-water dissolving process was proposed to improve the germanium extraction. Alkali-material ratio, microwave heating temperature and leaching temperature are the significant factors for the process. By analyzing each factors systematically, the optimized conditions were obtained as follows, alkali-material ratio of 1 g·g^-1, aging time of 5 day, microwave heating at 400℃, microwave alkaline roasting holding time of 10 min, liquid-solid ratio of 5 mL/g, leaching temperature at 70℃ with the germanium extraction about 91.15%. Compared with the existing methods, the alkaline roasting temperature was reduced from 950~1 100℃ to 408℃ and the alkaline roasting holding time was greatly reduced from 1~4 h to 10 min.