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。
2
A black mineral is an ore of niobium and tantalum.
一种黑色矿物是铌、钽矿石。
3
The machine is widely used in classification Tungsten, Tin, Tantalum, Niobium, Rare Metals, Noble Metals, Iron, Manganese Ore and Coal ore, it is the main equipment of gravity concentration.