黑曲霉溶解磷矿粉矿化水体中铀的研究

Removal Uranium from Mineralized Effluent by Aspergillus Niger to Dissolve Phosphate Rock Powder

开展了采用黑曲霉溶解磷矿粉释放可溶性正磷酸盐,进而矿化水体中铀的研究。试验结果表明:黑曲霉具有良好的溶磷效果,22d后废水中的磷质量浓度可达到242.32mg/L;黑曲霉能够将废水中的铀质量浓度从50.00mg/L降至2.32mg/L,铀的去除率达95.36%;铀的去除率和溶液中磷质量浓度呈正相关性关系,相关性系数为0.92。采用能谱仪对矿化产物进行分析,能谱图中出现了较明显的铀元素信号峰,表明铀与正磷酸盐结合生成了不溶于水的U-P矿物。

Uranium（Ⅵ）biomineralization by soluble ortho-phosphate from decomposition by aspergillus niger of the phosphate rock powder,a cheap and readily available material,was studied in detail.The aspergillus niger,which was isolated from the uranium mine tailings mud,was used for dissolving the phosphate rock powder.The results show that aspergillus niger is effective in solubilizing P from the phosphate rock powder,and the concentration of the dissolved phosphate reached242.32 mg/L after 22 days.95.36% of uranium in solution could be removed by uranium biomineralization,and the concentration of uranium in solutions decreased from 50.00 mg/L to 2.32 mg/L.The phosphorus concentration is positively correlated with the uranium concentration（R^2=0.92）.The precipitate generated in the mineralization experiment was analyzed by EDS,and the peaks of uranium are found in the EDS images indicate that the U-P mineral is formed.