桂西铝土矿中稀有和稀散元素地球化学特征

Geochemical characteristics of the rare metal and rare-scattered elements of bauxite in western Guangxi

对桂西不同类型铝土矿中稀有、稀散元素及其含量的分布特征和资源状况的调查表明:在岩溶堆积型铝土矿中,Ga、Zr、Sc、Nb主要赋存在矿石中;Ta主要赋存在粘土中;Hf在矿石和粘土中的含量无明显区别。岩溶堆积型和原生沉积型铝土矿中稀散元素Ga、Sc和稀有元素Zr、Hf、Nb、Ta具有明显的富集趋势,其中Ga、Sc、Zr、Hf已经或基本达到伴生矿综合利用的标准,具有综合回收利用的价值,而沉积型铝土矿的铁铝岩层中Nb和Ta的含量已经达到圈定独立矿体的要求。

The investigation of resources condition and the distribution characteristics of the rare metal and rarescattered elements in different types of bauxite and red mud in western Guangxi indicate that in the bauxite of karst accumulation,Ga,Zr,Sc and Nb exist mainly in the ore. Ta exists mainly in clay,and Hf has no obvious difference in minerals and clay. The rare-scattered elements（ Ga,Sc） and rare elements（ Zr,Hf,Nb and Ta） have obvious enrichment trend in the bauxite of karst accumulation and primary sedimentary. Ga,Sc,Zr and Hf have already or almost reached the standard of comprehensive utilization of associated minerals,and have the value of comprehensive recycling. The contents of Nb and Ta in the ferrallite layers of sedimentary type bauxite meet the requirement of independence for delineating ore body.