Rare earth beneficiation
The ore dressing method of rare earth ore is based on the difference in physical and chemical properties of rare earth minerals and associated gangues and other minerals. The ore dressing of rare earth ores usually adopts the following methods: 1. Radiation beneficiation method mainly uses the difference of strontium content between rare earth minerals and gangue minerals in ore, and uses γ-ray radiation concentrator to separate rare earth minerals from gangue minerals. Radiation beneficiation is mostly used for pre-selection of rare earth ore. At present, this method is not widely used in the industry. Second, the gravity beneficiation method uses the difference of the density of rare earth minerals and gangue minerals for sorting. Commonly used re-election equipments include conical concentrators, spiral concentrators, shakers, and the like. The re-election mainly separates rare earth minerals from gangue minerals such as quartz and calcite with low density to achieve the purpose of preconcentrating or obtaining rare earth concentrate. Re-election is widely used in the production of coastal sand mines; it is sometimes used as a means of pre-enrichment in the processing of rare earth veins. Third, magnetic separation separation method Some rare earth minerals have weak magnetic properties. They can be used to separate rare earth minerals from other minerals by using magnetic separators with different magnetic field strengths, which are different from the associated gangue and other minerals. In beach sands beneficiation, often using weak magnetic iron ore of titanium and monazite separation; high intensity magnetic separation can be employed to make separate monazite and zircon, quartz and other minerals. In the beneficiation of rare earth veins, in order to simplify the flotation process and save flotation reagents, strong magnetic separation is sometimes used to pre-enrich the rare earth minerals. With the continuous development of strong magnetic technology, strong magnetic separation will be more and more widely used in the processing of rare earth ore. 4. Flotation method utilizes the difference of surface physical and chemical properties between rare earth minerals and associated minerals, and uses flotation method to separate it from associated gangue and other minerals to obtain concentrate. It is the main mineral processing method widely used in the production of rare earth veins. . The MountainPass rare earth mine in the United States is a flotation process for the production of rare earth concentrates. In the production of seashore sand mines, after heavy sand is obtained by re-election, rare earth concentrates are often obtained from heavy sand by flotation. 5. Electrification method Rare earth minerals are non-good conductors, and their electrical conductivity can be different from that of associated minerals. Electroporation is used to separate them from conductive minerals. Electrification is often used in the selection of heavy sands in coastal sand mines. 6. Chemical beneficiation method for rare earth deposits adsorbed on kaolin or clay in the form of ions. The characteristics of the rare earth ions which are easily dissolved in the sodium chloride or ammonium sulfate solution can be fully utilized, and the chemical beneficiation method which first leaches and then precipitates is used for recovery. For the fluorocarbonate rare earth mineral which is soluble in acid or undergoes phase transition at high temperature, it can be pre-concentrated by flotation method and then purified by chemical beneficiation method (acid leaching or high temperature baking).
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