Lohmann Mine Ore Dressing Plant

Lohman (Lowman) beneficiation plant located in Idaho (Idaho) Bear Valley (Bear Valley). The main niobium ore minerals dilute black gold mine, iron ore niobium. Symbiotic metallic mineral monazite, magnetite, titanium, iron and the like. The rough selection is carried out on a sand mining vessel, which is sorted by jigging and shaker. Heavy sand-containing selected euxenite 610 g / m ^3, columbite 122 g / m ^3, monazite 310 g / m ^3, further comprising fergusonite ore, xenotime, zircon and the like. Among them, magnetite, ilmenite and garnet account for 85%. Send it to the Lohmann Select Plant for further processing.

The selected plant scale is 150-200 tons/day, and the combination flow chart 1 is selected by magnetic separation-electric selection-wind shaker-shaker reselection. According to the mineral composition, density and relative magnetization coefficient of heavy sand, magnetite (ilmenite → ilmenite → garnet → coltan → black gold ore → monazite → spinel → zircon), and relative conductivity In order to increase the difference (silicate → phosphate → carbonate → oxidized ore → sulfide ore), the heavy sand is first fed into the 1.2 × 2.4 m electric vibrating screen, and the material on the sieve (+1.6 mm) is fed into 0.6 × 1.2 m rod mill, grinding particle size -1.6 mm, and the electric vibrating screen constitutes a closed circuit. The undersize material (-1.6 mm) was graded by a 0.6×4.6 m Dow classifier, overflowed and discarded, and the underflow (containing 75% solids) was scrubbed with vigorous stirring and then fed to a magnetic separator to select magnetite. After the non-magnetic product is sent to the dryer for drying, it is fed into a Kung Kate cylindrical magnetic separator to select magnetite-ilmenite. The non-magnetic portion was selected from ilmenite-garnet by an induction roll magnetic separator. Magnetic separation tailings (including coltan, black gold ore, monazite, etc.) are preheated to 350 ° C for the "Capco HT46" corona electrostatic concentrator for sorting. The conductor part (the coltan or black gold ore) is divided into two stages by a 0.8 m electro-vibration screen, and is sent to a belt-type magnetic separator to select residual ilmenite and garnet. The non-magnetic product is selected from the coltan-black gold concentrate by a wind shaker and a wet shaker. It has been proved by the fact that the sorting efficiency of the belt type magnetic separator is more reliable than that of the induction roller type magnetic separator, but the production capacity is small and it is not suitable for rough selection. The non-conductor part (monazed stone, etc.) is separated by two magnetic separations to produce garnet, zircon- quartz , monazite and the like. Total concentrate grade: Nb ₂ O ₅ 20%~25%, Ta ₂ O ₅ 2%～5%, U ₃ O ₈ 6%～10%, ThO ₂ 1%, TR ₂ O ₃ 18%～22%, It is sent to the St. Louis plant for chemical treatment, extracting strontium and barium, and also recovering compounds of uranium , thorium and rare earth elements.

Figure 1 Luoman concentrator process