Sorting process of micro-fine particle low-grade tantalum-niobium ore

The invention discloses a sorting process of micro-fine particle low-grade tantalum-niobium ore. The sorting process aims at solving the technical problems that an existing sorting mode of micro-fineparticle low-grade tantalum-niobium ore is complex in process, long in flow, low in efficiency and high in energy consumption. The rough steps of the sorting process are as follows: performing magnetic separation on tantalum-niobium ore by a high-gradient superconducting magnetic separator under the condition of low magnetic field intensity; removing iron-containing gangue minerals; then enablingthe tantalum-niobium rough concentrate to be subjected to flotation, wherein the flotation process adopts a process of one-time roughing, two-time concentration and two-time scavenging and sequentialreturning of middlings, obtaining tantalum-niobium bulk concentrate through flotation, finally, enabling the tantalum-niobium-tungsten bulk concentrate to be subjected to magnetic separation through ahigh-gradient superconducti