Fergusonite ore deposits mainly in the case of granite and weathered granite rock class. Deposits dominated by brown earth mines are rare. The brown castor weathering crust deposit in a central and southern part of China is currently the world's largest rare earth industrial deposit with the largest number of rare earths. The main ingredients are mineral ore fergusonite ore, monazite, brown epidote, zircon, titanium, iron ore, rutile and quartz, feldspar, mica and other gangue minerals. Niobium and rare earth are present in minerals of different particle sizes. Figure 1 Selected process of brownstone ore weathering crust ore
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In order to effectively recover lanthanum and rare earth, the beneficiation process is carried out in two steps: in the first step, according to the distribution of lanthanum and rare earth in the various ore grades of the ore, the coarse concentrate containing Nb2O5 1.821% is selected by sieving; the second step is The coarse concentrate was selected by magnetic separation-re-election-flotation (see the selection process shown in Figure 1) to obtain a concentrate containing 37.75% of Nb2O5. In addition, 61.82% monazite concentrate containing REO and zircon concentrate containing 63% ZrO2 can be obtained during the beneficiation process. 