Method for precipitating rare earth from ionic rare earth ore magnesium sulfate leaching solution

Abstract

The invention discloses a method for precipitating rare earth from ionic rare earth ore magnesium sulfate leaching solution. The method specifically comprises the following steps: (1) leaching ionic adsorption type rare earth raw ore to obtain leaching solution by using magnesium sulfate solution; (2) adding a magnesium-containing precipitator into the leaching solution obtained in the step (1), so that rare earth ions in the leaching solution are precipitated out to obtain a magnesium-containing rare earth precipitate; and (3) introducing carbon dioxide gas into the magnesium-containing rare earth precipitate, wherein the aim of introducing carbon dioxide refers to accelerating the reaction and removing magnesium in the precipitate, converting the magnesium in the precipitate into easily dissoluble magnesium bicarbonate to enter the solution, and converting the rare earth into a rare earth carbonate precipitate. According to the method for precipitating rare earth from ionic rare earth ore magnesium sulfate leaching solution, ammonium bicarbonate solution is not used as a precipitator, ammonia nitrogen pollution is avoided, and the rare earth precipitation capacity is high.

Description

Technical field [0001] The invention relates to the technical field of rare earth metallurgy, in particular to a method for precipitating rare earths from ionic rare earth ore magnesium sulfate leaching solution. Background technique [0002] my country has extremely rich rare earth resources. The reserves of rare earths account for about 36% of the world's rare earths, and the output accounts for 97% of the world demand. The proven reserves of ion-adsorbed rare earths are only 1.48 million tons, accounting for only 1.4 of the world's industrial reserves of rare earth resources. The ion-adsorbed rare earth is a kind of rare earth ore in which rare earth elements do not exist in the form of mineral phase, but are adsorbed in clay minerals in an ionic state. Due to the small resource reserves, concentrated distribution and complete distribution, high content of high value-added elements, low radioactivity ratio, high-tech applications, especially military applications, more elements...

AI Technical Summary

Problems solved by technology

[0003] At present, ammonium sulfate and other ammonia solutions are mostly used as leaching agents in ionic rare earth mines, and ammonium bicarbonate is used as precipitation reagent. For every ton of rare earth mined, about 7 tons of ammonium sulfate and about 3.5 tons of ammonium bicarbonate are consumed, and ammonia nitrogen-containing wastewater is produced. About 1000-1200 cubic meters, the discharge of ammonia nitrogen from the mine seriously endangers the surrounding ecological environment; on the other hand, the in-situ leaching of ore causes the leaching agent ammonium sulfate to stay in the mountain or enter the groundwater system, posing a potential threat to the groundwater system