Pretreatment method for organic extracting agent and application thereof

Abstract

The invention provides a pretreating method of an organic extracting agent and an application thereof. The carbonic acid rare-earth is added with water to mix the paste or the alkaline earth metal ore containing calcium and magnesium is added with the carbonic acid rare-earth solution to obtain the pretreating paste, the organic extracting agent is pre-treated at certain temperature, the rare-earth ions inside the paste is extracted into the organic phase to obtain the load organic extracting agent containing the rare-earth metal ions for the unsaponifiable extraction and separation of the rare earth. The organic extracting agent is pre-treated, the hydrogen ion or the alkaline earth metal ion do not enter the extracting process to stabilize the balanced acidity in the extracting process,the alkaline earth metal content in the rare earth product is low; particularly, the organic phase in the extracting process does not need saponification or generate the ammonian waste water. The method avoids the environmental pollution of the ammonian waste water, greatly lowers the production cost of the rare earth products and saves a large amount of 'three wastes' treatment fees.

Description

technical field [0001] The invention relates to a pretreatment method of an organic extractant and its application. Specifically, after the rare earth carbonate is mixed with water or alkaline earth metal minerals containing calcium and magnesium with a rare earth solution, the organic extractant is pretreated to obtain a loaded organic extractant containing rare earth metal ions for non-saponification extraction of rare earth elements Separation belongs to the field of rare earth solvent extraction and separation. Background technique [0002] At present, the separation and purification of a single rare earth element in industry generally adopts solvent extraction. The most commonly used processes are: saponification of P507, P204, C272 and other extractants to extract and separate rare earth elements in hydrochloric acid system ([1] Collected Papers on Rare Earth Chemistry, Changchun Yinghua Institute, 1982, Science Press; [2] Xu Guangxian editor-in-chief, Rare Earth, 2nd...

AI Technical Summary

Problems solved by technology

The extractants used in the above extraction and separation are all organic extractants, which require extraction and separation at low acidity. The extraction capacity (distribution ratio) is inversely proportional to the equilibrium acidity of the water phase. Generally, to extract a rare earth ion, three hydrogen ions need to be replaced into the water phase. Therefore, inorganic bases such as ammonia, sodium hydroxide, and ammonium bicarbonate must be used to saponify the extractant first, remove hydrogen ions (see reaction formula 1), and then exchange and extract with rare earth ions (see reaction formula 2), it can be seen that , in the extraction process, not only is the cost increased due to the consumption of a large amount of ammonia, but also a large amount of ammonia nitrogen wastewater is produced, causing serious pollution to water resources. Due to the low concentration of ammonia nitrogen wastewater, it is difficult to recycle, and the recycling cost is high. Enterprises Difficult to accept