Method for deep purification and lead removal of ammonium perrhenate solution

Abstract

The invention discloses a method for deep purification and lead removal of an ammonium perrhenate solution, and belongs to the field of separation and purification of scattered metals. The method comprises the following steps: preparing a ammonium perrhenate solution, selectively and deeply adsorbing and removing Pb in the ammonium perrhenate solution, and evaporating and crystallizing the adsorbed and purified solution to obtain high-purity ammonium perrhenate. According to the invention, special crown ether resin is synthesized for lead ions and is used as a lead ion adsorbent to adsorb andremove lead ions in the ammonium perrhenate solution, the specific lead removal process and parameters are optimally designed, therefore, lead can be efficiently and selectively adsorbed and removed,it is guaranteed that the solution obtained after lead removal can be subjected to evaporative crystallization to produce 99.99% or higher grade ammonium perrhenate, the loss of valuable element rhenium is reduced, the requirement for low impurity content of ammonium perrhenate in various industries is met, the technological process is short, the product percent of pass is high, and the productioncost is low.

Description

technical field [0001] The invention belongs to the field of separation and purification of scattered metals, more specifically, it relates to the synthesis of a novel molecular recognition cationic resin, which can deeply purify divalent cations in ammonium perrhenate solution, and is used for producing high-purity ammonium perrhenate above 99.99% new method. Background technique [0002] Rhenium is one of the seven rare metals with a high melting point second only to tungsten. When rhenium is added to a variety of transition metal elements to form an alloy, it can produce a functional material with excellent "rhenium effect", making it suitable for use in aero-engine turbine blades. It has special applications in manufacturing, nuclear reactor alloys, missile high-temperature components, special crucibles, and super-temperature materials. At the same time, because rhenium has an unsaturated 4d electron shell and is easy to donate 5 electrons, rhenium and its compounds hav...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the Pb impurity in ammonium perrhenate is difficult to remove in the existing technology, and it is difficult to prepare high-purity ammonium perrhenate, and a method for deep purification of ammonium perrhenate solution to remove lead is provided

The present invention selects a crown ether resin of a special size as the Pb ion adsorbent, and forms a stable host-guest complex action mechanism according to the dipole-ion interaction between the host molecule and the guest molecule of the crown ether ligand, It achieves the purpose of having obvious selective recognition ability for the complexation of different metal ions, so that it can efficiently and selectively remove Pb deeply, and solve the problem of the difficulty in removing Pb with ammonium perrhenate, long process flow, low product qualification rate, and production problems. Problems such as high cost and high loss of valuable element rhenium enable the solution after Pb removal to evaporate and crystallize to produce 99.99% or higher ammonium perrhenate, which meets the requirements of various industries, especially aerospace materials, for ammonium perrhenate with low impurities Require