Method for isolating magnesium and lithium from solution containing magnesium and lithium

Abstract

The invention relates to a method for isolating magnesium and lithium from solution containing magnesium and lithium; the method comprises: adjusting pH of the solution containing magnesium and lithium, adding soluble phytate into the solution containing magnesium and lithium, so that Mg<2+> in the solution containing magnesium and lithium forms water-insoluble complex precipitate while Li<+> remains in the solution; after solid-liquid separation, concentrating the solution containing Li<+>, precipitating to obtain lithium carbonate, dissolving the magnesium-containing precipitate with hydrochloric acid, adsorbing phytate ions therein through weak alkalinity anions in weak acidity environment, and using the obtained solution containing Mg<2+> to prepare a magnesium salt; using NaOH solution to desorb the resin that loads phytate ions for the purpose of regeneration, and using the desorbed solution to precipitate Mg<2+> in solution containing magnesium and lithium in next cycle. The method has a short process, is simple to perform, and is efficient for isolating magnesium and lithium from the solution containing magnesium and lithium, the phytate is recyclable, the production cost is low, and the method is easily industrially applicable.

Description

technical field

[0001] The invention belongs to the technical field of separation of magnesium and lithium in salt lake brine, and in particular relates to a method for efficiently separating magnesium and lithium in solutions containing magnesium and lithium. Background technique

[0002] Lithium is becoming more and more important in modern industry and is known as "the new energy metal in the 21st century". When Obama took office, he positioned lithium as a national strategic material that is as important as oil. With the rapid development of the new energy industry, the market demand for lithium has expanded rapidly, and the mining of lithium resources has become more important.

[0003] In nature, lithium resources mainly exist in brine, especially salt lake brine, and its reserves account for more than 80% of the total lithium resource reserves. At present, more than 85% of the world's lithium products come from salt lake brine, and most of them are monopolized by Ch...