1. Baiyun Obo ore niobium resources
China’s more than 80% of the niobium resources concentrated in Baotou Baiyunebo mine, its low grade (0.12 ~ 0.14%), only the Brazilian niobium grade 1/20. Baotou Baiyun Obo Iron Mine is a unique type of iron ore deposit in China. It is a deposit and hydrothermal metasomatic deposit, which is a large iron and polymetallic complex. The mining area consists of the main, east and west ore bodies, 71 species have been found, 129 kinds of minerals are formed, the main iron ore grade is 36.48%, the rare earth oxide grade is 5.18%, the fluorine grade is 5.95%, the niobium oxidation Grade 0.129%.
The niobium resources of the Baiyun Obbo deposit have the following characteristics:
(1) large reserves. Nb2O5 long-term reserves of 6.6 million t, industrial reserves of 1.57 million t, of which the main ore iron ore body Nb2O5 295,000 t.
(2) widely distributed. The main and east ore iron ore bodies contain niobium, and the ore body to be mined in the west ore also contains niobium. The main and east ore deposits, the eastern contact zone and the western ore dolomite also contain niobium, and the niobium in this part of the surrounding rock High content.
(3) low grade of niobium. The content of w (Nb2O5) is 0.0680% ~ 0.14% in the main ore body and the ore in the East ore body, and 0.20% ~ 0.25% w (Nb2O5) in the ore body of the eastern contact zone.
(4) The size of niobium mineral embedded in each ore section is generally less than 20μm, part of less than 3μm; No. 2 ore body niobium mineral embedded particle size is relatively coarse, generally more than 20μm.
(5) The degree of niobium dispersion is high, about 15% of niobium is the same type or very small inclusions in iron minerals, rare earth minerals and niobium-containing silicate minerals.
(6) There are many kinds of niobium minerals, and the main chemical properties of niobium minerals are different, the difference is large, and the symbiosis between niobium minerals and other minerals is close, and the difference is small, which increases the difficulty of beneficiation The
Niobium as a major resource of Baiyunebo mine, has not yet been well applied to industrial production.
2. Tantalum and niobium resources
China does not have an independent niobium mine, niobium is often mixed with rare earth and tantalum, difficult to pick difficult to recover, the recovery rate is very low. Jiangxi Yichun tantalum and niobium resources in China and Asia’s largest tantalum and niobium minerals. China’s tantalum and niobium minerals are more than half from Yichun mineral. Some of China’s large or large tantalum and niobium minerals are mostly small, veins scattered, tantalum and niobium mineral embedded grain size is fine, the origin of low grade ore, the state of the poor, large-scale mining of mining less, so the economic resources not much. At the same time, the processing capacity is very large, the selectivity is small, the recovery rate is not high, the recovery period is longer.