Rare earths are used in military, aviation, metallurgy, chemical materials and some "high-tech" industries. However, there are many types of rare earth elements and the types of ores are relatively complex. For ores formed by different origins, the process methods used are also different. At present, there are three commonly used processes: gravity separation, magnetic separation and flotation.
If a single method is used, it is difficult to effectively separate complex rare earth ores, so two or more combined methods must be used for separation to obtain a more ideal beneficiation index.
The magnetic separation-flotation combined process is a relatively common mineral processing method in rare earth mineral processing. It is mostly suitable for the comprehensive recovery of rare earth ores in iron ore tailings, or several or more than a dozen different minerals can be derived from the same element, and Rare earth ores with close symbiotic relationship and fine particle size.
The polymetallic ore with symbiotic iron-niobium and rare earth can adopt the process of weak magnetic separation-strong magnetic-flotation. After the raw ore is finely ground (-0.074mm accounts for 90%), magnetite is selected by weak magnetic rough separation. During flotation, H205 is used as collector, J102 is used as activator, and water glass is used as inhibitor. Under the condition of weak alkali, rare earth concentrate is obtained through roughing and concentration.
Under normal circumstances, the magnetic separation-gravity separation combined process only has a better separation effect for certain specific rare earth ores. Such as complex rare earth ores accompanied by rare metal ores.
Rare earth ores contain niobium, iron and manganese oxides, and gangues include quartz and feldspar. The combined method of magnetic separation and gravity separation can be used. The tailings are re-selected through a shaker to obtain rare earth concentrates.
The gravity separation-flotation combined process is generally suitable for dealing with some rare earth ores with high mud content and easy crushing. For example, in the early development, the rare earth resources left in the tailings due to backward technology can be recovered and separated by this method. Don't.
The combined magnetic separation-gravity separation-flotation process is mostly used for the separation of complex polymetallic rare earth deposits. Not only can the quality index of rare earth concentrate be achieved, but also the comprehensive utilization of multiple resources can be realized.
In a rare earth mine, the main minerals are niobite, zircon, and xinganite, followed by monazite, bastnaesite, and heliostat, and other useful minerals include iron minerals and fluorite; Mainly stone and quartz, accompanied by a small amount of sodium amphibole, tourmaline, chlorite, mica, etc., can be separated by magnetic separation-gravity separation-flotation combined process.
The above is the common rare earth ore combined beneficiation process plan. In the actual beneficiation plant, due to the complex nature of rare earth ore and various types of minerals, it is impossible to choose the process. Rare earth ore beneficiation process and a complete set of rare earth ore beneficiation equipment can obtain an ideal return on investment.
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