Abstract The mineralogical studies on Black mica raw material revealed the presence of notable high radioactive minerals such as uranium minerals (Soddyite, Uranophane, Uranothorite, and Ishikawaite), niobium - tantalum minerals (Columbite and Plumbopyrochlore), and rare earth elements minerals (Allanite, Xenotime, and monazite). From mineralogical and chemical studies make it possible to determine optimal processing conditions, the preferred lixiviate option, and the required costs. Black mica sample was found to assay 1680 mg/Kg U, 5000 mg/Kg REEs, and 50,750 mg/Kg Nb while Ta not exceeds 5000 mg/Kg. Through applying sulfuric acid agitation leaching, 92% of uranium was dissolved under optimum leaching conditions of: 8% concentration of H2SO4 acid, 1/4 solid/liquid ratio at room temperature for 4 h reaction time, while RE2O3, Nb2O5 and Ta2O5 remained in the unattacked residue. A phosphate mixture was used for rapid dissolution of refractory minerals, REEs, Nb and Ta minerals, after fusion, which give 97.8%, 99%, and 97%, respectively, leaching efficiencies. Ion exchange, solvent extraction and precipitation techniques were used for separating and recovery of U, REEs, Nb, and Ta species from their leach liquor.

中文翻译：

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加工矿化黑云母以回收铀、稀土元素、铌和钽

摘要 对黑云母原料的矿物学研究表明，存在显着的高放射性矿物，如铀矿物（Soddyite、Uranophane、Uranothorite 和 Ishikawaite）、铌钽矿物（Columbite 和 Plumbopyrochlore）和稀土元素矿物（Allanite、磷钇矿和独居石）。通过矿物学和化学研究，可以确定最佳加工条件、首选浸出液选项和所需成本。发现黑色云母样品测定了 1680 mg/Kg U、5000 mg/Kg REE 和 50,750 mg/Kg Nb，而 Ta 不超过 5000 mg/Kg。通过硫酸搅拌浸出，在最佳浸出条件下，92%的铀被溶解：8%浓度的H2SO4酸，1/4固液比，室温反应4h，而RE2O3，Nb2O5 和 Ta2O5 保留在未受侵蚀的残留物中。磷酸盐混合物用于快速溶解难熔矿物、稀土、铌和钽矿物，熔融后分别达到 97.8%、99% 和 97% 的浸出效率。离子交换、溶剂萃取和沉淀技术用于从浸出液中分离和回收 U、REE、Nb 和 Ta 物质。