Foreign tantalum and niobium powder ore beneficiation process or native mud content and more ore, ore washing operation is essential. Australia's Grinbus mine weathered pegmatite alluvial clay rough selection plant, set up two washing system, the original mine with a diameter of 1.5m, a pore size of 10mm cylindrical sieve twice after washing, selected under the sieve, sieve large and The clay ball is ground into a self-grinding mill for about 4 mm, and then sieved with a cylindrical sieve having a hole diameter of 10 mm. The material under the sieve is selected, and the material on the sieve is discarded or returned for regrind. The washing water consumption is 5m 3 /t, and the cylindrical sieve processing capacity is 350 tons/hour.
Foreign tantalum and niobium concentrator attention to efficient use of grinding and classification equipment to reduce the mud of tantalum and niobium minerals. Good results were obtained from the surrounding pebble rod mill and vibrating screen closed circuit in the original pegmatite roughing plant of the Greenbus mine. The Borneo Lake antimony mine in Canada has been continuously improved and the current grinding process is very distinctive. The mine is closed with a Ф2.4m×3.6m Marcy-type lattice ball mill A-C horizontal vibrating screen (straight screen), the sieve size is 2.5mm, and the sieve is graded by 0.2mm with Derrick sieve, -2.5+0. The 2mm grain grade is selected by a spiral concentrator, and the tailings are dehydrated by a curved sieve and returned to re-grind. The ball mill has two kinds of products to form a cycle, that is, a two-stage closed-circuit grinding is realized by one mill. After the adjustment of the grinding circuit, the cyclic load rate is usually about 180%, and the cyclic load is small and easy to form excessive pulverization.
Foreign roughing tantalum niobium iron ores is still reselection based, multi-use and efficient reselection apparatus, the process is simple. For example, the Grimbs mine directly uses a jig for rough selection of -10mm ore. The re-election-flotation-re-election process formed in the 1980s in Bonn Lake, Canada, is becoming more and more perfect. The process is still dominated by re-election, and flotation is only used to treat fine mud. The re-election equipment used GEC spiral concentrator, 3-layer suspended Dyest shaker, Holman slime shaker, and cross-flow belt concentrator. The former Soviet Union used flotation to separate the coltan, fine-grain and topaz in the re-selected concentrate. The collector was hydroxamic acid, the regulator was oxalic acid, and it was floated in hydrochloric acid medium (pH 2). When Ta 2 O 5 is contained at 2.52%, the concentrate grade is 27% and the recovery rate is 90%.
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