Reactor for the decomposition of a rare earth-containing solid

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The invention relates to a reactor (10) for the decomposition of a rare earth-containing solid (18), in particular of a rare earth-containing ore, wherein the reactor (10) a reaction chamber (14) comprises, in which the rare earth-containing solid (18) can be brought into contact with an acid-containing breaker for pulping, wherein the reactor (10) at least one HCl-Burner (26) comprises, by means of which a direct reaction of hydrogen and chlorine can be produced and by HCl as acidic breaker in the reaction space (14) with the rare earth-containing solid (18) can be brought into contact. The invention relates to a method for operating such a reactor further (10).