A method for removing iron ions in solutions containing neodymium, praseodymium, dysprosium and iron

Abstract

The invention discloses a method for removing iron ions in a solution containing neodymium, praseodymium, dysprosium and iron, by adding glucose and Mix evenly, and after hydrothermal treatment, iron-containing precipitates are formed at the bottom, the residual iron concentration in the supernatant is lower than 20mg / L, and the retention rate of rare earth elements is higher than 97%. The invention can efficiently separate iron from the solution containing neodymium, praseodymium, dysprosium and iron, solves the problem of iron pollution to the extractant in the purification of rare earth solution, and improves the purity and utilization value of rare earth elements in the solution; the invention is suitable for treating The rare earth solution with high concentration of iron or the acid solution of waste materials has high rare earth retention efficiency, low residual iron concentration in the solution, simple operation and low cost.

Description

technical field [0001] The invention relates to the field of waste resource utilization, in particular to a method for removing iron ions in a solution containing neodymium, praseodymium, dysprosium and iron. Background technique [0002] Iron is a common metal in rare earth waste containing neodymium. It has a high content and a chemical valence similar to that of rare earths, so it is difficult to separate from rare earths. Finding an efficient and stable iron separation method is the key to recovering precious rare earth elements from rare earth waste and obtaining high-purity rare earth products. At present, among the reported separation methods of iron in rare earth wastes, wet separation includes hydrochloric acid excellent solution method, sulfuric acid double salt precipitation method, total extraction method, phosphate precipitation method, sulfide precipitation method, etc. [0003] (1) The main steps of the hydrochloric acid optimal solution method include oxidat...

AI Technical Summary

Problems solved by technology

The process of separating different rare earth elements by extraction technology is very mature, but the extraction efficiency is easily affected by iron ions in the solution. The combination of iron and extractant will lead to the poisoning of the extractant and reduce the efficiency of rare earth extraction.

In view of the harm of iron in the extraction, some special iron extractants have been developed, but they are expensive, and when dealing with high concentrations of iron in the solution, the amount of extractant used is large and the loss is high

Images