Beneficiation of brown ore

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. In order to effectively recover lanthanum and rare earth, the beneficiation process is carried out in two steps: in the first step, a coarse concentrate containing Nb ₂ O ₅ 1.821% is initially selected according to the distribution of lanthanum and rare earth in each fraction of the ore; In the second step, the coarse concentrate is selected by magnetic separation-re-election-flotation (see Figure 1 for the selection process) to obtain a concentrate containing Nb ₂ O ₅ 37.75%. In addition, 61.82% monazite concentrate containing REO and zircon concentrate containing ZrO ₂ can be obtained during the beneficiation process.

Figure 1 Selected process of brownstone ore weathering crust ore

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