A black mineral is an ore of niobium and tantalum.
一种黑色矿物是铌、钽矿石。
2
The leaching mechanism of niobium from a refractory niobium-tantalumore by concentrated potassium hydroxide was studied.
实验研究了难分解铌钽矿在高浓度氢氧化钾溶液中浸出过程的机理。
3
A new process called ore blending-KOH molten salt decomposition-water leaching was first put forward for the processing of a low-grade refractory tantalum-niobiumore.