Method for removing iron ions from solution containing neodymium, praseodymium, dysprosium and iron

Abstract

The invention discloses a method for removing iron ions from a solution containing neodymium, praseodymium, dysprosium and iron. According to the method, glucose is added to the acidic solution containing neodymium, praseodymium, dysprosium and iron and evenly mixed, the molar ratio between the iron and the glucose is 0.2-2, after hydro-thermal treatment, sediments containing iron are formed at the bottom, the concentration of iron residues in supernatant is 20mg/L, and the retention rate of rare earth elements is higher than 97%. By the adoption of the method for removing iron ions from the solution containing neodymium, praseodymium, dysprosium and iron, the iron can be efficiently separated from the solution containing neodymium, praseodymium, dysprosium and iron, the problem that during rare earth solution purification, iron pollutes an extractant is solved, and the purity and utilization value of the rare earth elements in the solution are improved; the method is suitable for processing the rare earth solution and waste acidic solution containing a high concentration of iron, the rare earth retention efficiency is high, the concentration of residual iron in the solution is low, operation is easy, and the expense is low.

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...

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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 effi

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