Lanthanum And Lanthanum Tungsten Electrode

Lanthanum is a chemical element , its chemical symbol is La, its atomic number is 57 , belonging to the lanthanide elements for rare earth metals is the most reactive metal in the air is easily oxidized. Lanthanum quarry alone accounted for 25% of total rare earth . A soft silver-white metal , malleable . With water effect. Soluble in dilute acid . Easily oxidized in air ; heating can burn to form oxides and nitrides. Heated in hydrogen generation hydride . It is the second most abundant rare earth elements , often along with other rare earth elements present in monazite , fluorocarbon lanthanum strontium ore . It is uranium, thorium or plutonium fission of radioactive products . It gives the refractive index of the special properties of the glass , the glass having a higher refractive index . Preparation of lanthanum general dehydration of hydrated lanthanum chloride , the use of calcium metal restore , or anhydrous lanthanum chloride electrolysis and after melting in the system. Used to manufacture an expensive camera lens . 138La is a radioactive half-life of 1.1 × 1011 , the trial was to treat cancer .

Lanthanum tungsten electrode is the European country in the 1980s with the hope for alternative thorium tungsten products, improved varieties, once launched, its excellent welding performance attracted much attention in the international welding industry and is very popular, especially by European Welding School in the pursuit, for this reason, the export volume of lanthanum tungsten electrode tungsten thorium behind , while in the domestic market awareness is not high. Its characteristics are the closest conductive properties of 2% thoriated tungsten electrodes , durable high burning rate of the current minimum .


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