The invention provides a method for extracting trace (Ta,Nb)2O5 from granite type tantalum and niobium ore waste rock by the process of "magnetic separation + high gradient magnetic separation + spiral chute + heavy medium separation + shaking table separation". Tantalum-niobium concentrate was obtained by crushing, screening, grinding, high-frequency screening, spiral classification, permanent magnet magnetic separation, iron removal, high gradient magnetic separation, spiral chute separation, heavy medium separation, shaking table separation. The method extracts tantalum and niobium concentrate from waste tantalum and niobium ore: (Ta,Nb)2O5≥ 40%, Ta2O5≥ 25%, Nb2O5≥ 15%, TiO2+Fe2O3≤ 1%, SiO2≤ 10%, and the recovery rate of tantalum and niobium concentrate > 85%, tantalum and niobium concentrate quality meets the national standard requirements, the recovery rate of tantalum and niobium concentrate exceeds the industry level.
The waste rock of tantalum-niobium ore is the ore body surrounding rock, rock inclusion, stripped waste rock and the depleted ore whose content of tantalum-niobium can not reach the industrial grade. In China, tantalum and niobium ores are mainly produced in Yichun of Jiangxi, Nanping of Fujian and Dongfang tantalum and niobium mines of Yunnan. In particular, Yichun Tantalum-niobium mining area in Jiangxi province covers an area of 7km2 with proven reserves of 1.85 tons tantalum, 1.49 tons niobium, 752,200 tons lithium, 401,700 tons rubidium and 54,300 tons cesium. It is a large orebody of albitite and limica granite containing various rare metals such as tantalum, niobium, lithium and rubidium. The industrial reserves of tantalum and niobium account for about 44.3% of the proven reserves in China. Over the past 40 years, the mine has produced about 400,000 tons of tantalum-niobium ore surrounding rock, rock, lean ore and stripped waste rock every year. These waste rocks are called "black spot ore" in the local mining area. In addition to a small number of these waste stones used for pit filling, paving, most of the comprehensive utilization has not been. Tens of millions of tons have been accumulated. Ta205 < 0.01% and Nb205<0.005% of the waste tantalum-niobium mine waste rock can not reach the industrial grade, and has been treated as waste ore and waste rock, wasting resources, not only affecting the mining of other high-quality minerals, but also occupying mountains and causing serious harm to the surrounding environment. It poses a threat to the life and property safety of the surrounding people. The trace tantalum pentoxide and niobium pentoxide can be extracted and separated from the waste rock of tantalum and niobium pentoxide.
