KOH亚熔盐浸出低品位难分解钽铌矿的实验

研究了低品位难分解钽铌矿的KOH亚熔盐浸出条件. 探讨了反应温度、初始KOH浓度、浸出时间和碱矿比等因素对铌和钽的浸出率的影响. 结果表明，铌和钽的浸出率分别可达98%和96%，较现行氢氟酸工艺提高10%以上，提高了难处理钽铌资源的利用率. 用无毒的KOH亚熔盐取代现行工艺中高浓高毒性的氢氟酸作为反应介质，从生产源头消除了F–的三废污染，为钽、铌湿法冶金开辟了一条新的途径.

Leaching of a Low-grade Refractory Tantalum-Niobium Ore by KOH Sub-molten Salt

A new leaching process for a low-grade refractory tantalumniobium ore by KOH sub-molten salt was studied. The effects of leaching temperature, initial KOH concentration, leaching time and mass ratio of alkali to ore on the leaching rate of Nb and Ta were investigated. The results show that the leaching rates of Nb and Ta can be raised as high as 98% and 96% respectively, 10% higher than those of the hydrofluoric acid process. Thus, the utilization rate of the refractory tantalumniobium resource was greatly improved. In the process, KOH sub-molten salt was used as reaction medium to substitute the highly concentrated and toxic HF solution of the traditional process. Consequently, the pollution of F was eliminated at the source. This provides a new way for extracting NbTa from the tantalumniobium ore.