Influence of the conditions of hydrochloric acid leaching on decomposition of niobium-rare-earth slag at atmospheric pressure

The article deals with the research on hydrochloric acid leaching of niobium-rare-earth slag obtained during reducing roasting of rare-earth-rare-metal ores of the Chuktukon deposit. The effect of temperature, HCl concentration, and leaching time on degree of decomposition of the slag phases was studied. It was shown that during atmospheric hydrochloric acid leaching, only phases with a britholite structure and a glassy phase can decompose, while the betaphyte and spinel phases remain intact.