The manufacturers of rare earth silicon magnesium introduced that due to the active nature of rare earth elements, they have become lithophile elements, and their natural metal anhydrous or sulfide has not yet been found in the crust. Common forms are complex oxides, water or anhydrous silicates, water or anhydrous phosphates, phosphorosilicates, fluorocarbonates, and fluorides. Because the ionic radius and oxidation state of rare earth elements are similar to all other elements, they often coexist with other elements in minerals.
At present, the application of rare earth elements is booming and has expanded to all aspects of science and technology, especially the development and application of some modern new functional materials. Rare earth elements have become indispensable raw materials. Metallurgical industry: rare earth is widely used in the metallurgical industry, accounting for about 1/3 of the total amount of rare earth. Rare earth elements are easy to form oxides, sulfides and sulfur oxides with high melting points and little plasticity at high temperatures with oxygen and sulfur. Adding rare earth elements to molten steel can play a role in desulfurization and deoxidation to change the morphology of inclusions, improve the normal and low temperature toughness and fracture of steel, reduce the hot brittleness of some steels, and improve the heating performance and the firmness of weldments. As a control agent for graphite nodulizing agent and nucleating agent to check harmful elements in cast iron, rare earth can improve the quality of castings and greatly improve the mechanical properties of castings. It is mainly used in four aspects: ingot mould, rolling roller, cast pipe and profiled parts. It can be used in nonferrous alloys to improve the physical and mechanical properties of various alloys based on nonferrous metals. Aluminum, magnesium and copper series are widely used.
