Method of continuously preparing rare earth metal compound precipitate

Abstract

The invention discloses a method of continuously preparing rare earth metal compound precipitate. The method comprises the steps of constantly adding a rare earth ion liquid and a precipitant into a reaction chamber according to a proportion of reaction amount of different rare earth ion liquids and the precipitants; meanwhile, allowing 15%-25% of precipitate obtained through standing and clarifying in a clarification chamber to flow back to the reaction chamber through siphonage; stirring constantly to enable the rare earth ion liquid and the precipitant in the reaction chamber to fully react; precipitating and crystallizing by combining the precipitate siphoned back to the reaction chamber from the clarification chamber; transferring, through overflowing, a mixed liquid to a purification tube for dynamic purification; recrystallizing the precipitate and crystal in the purification tube; transferring the mixed liquid undergone dynamic purification to the clarification chamber; standing and clarifying the mixed liquid in the clarification chamber so as to obtain precipitate; and discharging a supernatant in the clarification chamber through overflowing. The method can prepare the rare earth compound precipitate continuously, has good operation continuity, has high production efficiency, has less energy consumption, and the prepared product have high consistency.

Description

technical field [0001] The invention belongs to the field of rare earth compound preparation, and in particular relates to a continuous preparation method of rare earth compound precipitation. Background technique [0002] Rare earth metals, also known as rare earth elements, are the general term for the 17 elements of scandium, yttrium, and lanthanide in group IIIB of the periodic table of elements, and are often represented by R or RE. From the discovery of the first rare earth element yttrium in 1794 to the discovery of the natural rare earth element promethium in 1972, it took 178 years for people to find all 17 rare earth elements in nature. The luster of rare earth metals is between silver and iron, and the chemical activity of rare earth metals is very strong. [0003] Rare earth metals have extremely important uses and are an important part of contemporary high-tech new materials. A series of compound semiconductors, electro-optical materials, special alloys, new f...

AI Technical Summary

Problems solved by technology

[0007] In view of the existing process of preparing rare earth compounds, the preparation process must be reacted intermittently, that is, the reaction container is completed one after another, and cannot be carried out continuously. This method not only leads to low labor productivity, but also high energy consumption. Moreover, it also leads to poor consistency of the produced products; therefore, with the deepening of processing refinement and automation, all walks of life must carry out corresponding industrial structure adjustments, so it is urgent to improve the above technical problems