The book summarizes the work on the production of pure rare metals and their ligatures by electrolysis of molten media. The theory and practice of obtaining anhydrous salts of rare metals and electrolysis of melts with a liquid cathode (lithium, rubidium, cesium, uranium and rare earth metals), with a solid cathode (tantalum, niobium, zirconium, thorium, uranium and beryllium) are covered.