复杂铌矿高温还原熔炼-炉渣冷却结晶富集铌试验

针对白云鄂博铁铌稀土复杂多金属矿中铌矿相种类多、性质差异大、难以利用的难题,提出了复杂铌矿高温还原熔炼?炉渣控温冷却定向结晶富集铌新工艺,考察了碱度(CaO/SiO2比值)、铁还原率、冷却速度对渣中富铌矿相粒度、形貌与组成的影响.结果表明,铌主要富集于铈铌钙钛矿相,碱度是影响结晶矿相组成的关键因素,而铁还原程度不影响结...

Selective Enrichment of Niobium in Complex Ore by Reduction Smelting and Cooling Crystallization of Slag

Up to now, it is still difficult for the niobium resource in the Bayan Obo complex polymetallic ore to be effectively utilized due to the existence of a great variety of phases of niobium minerals and quite different Nb properties. Aiming at such problem, a combined processing technique consisting of high-temperature reduction smelting of complex niobium ore and cooling crystallization of slag was proposed to transform various Nb-bearing minerals into a type of Nb-bearing phase, which is beneficial to Nb extraction. The effects of basicity (CaO/SiO₂ ratio), the reduction degree of Fe and cooling rate on the grain size, compositions and micro-structure of Nb-bearing phase in the obtained slag were investigated in detail. It is found that the Nb in the slag exists mainly in the form of loparite; the basicity (CaO/SiO₂ ratio) is the key factor affecting the composition of crystalline phase of mineral, but the reduction degree of Fe has no effect on the composition of crystalline phase of mineral; a lower cooling rate is beneficial for increasing the grain size of Nb-bearing phase.