Application of a sulfur-containing polyimide resin as an adsorbent for rare earth elements

Abstract

The invention discloses the application of a sulfur-containing polyimide resin as an adsorbent for rare earth elements. The sulfur-containing polyimide resin is a random type sulfur-containing polyimide resin or a block type sulfur-containing polyimide resin. Amine resin, the structural formula of the random sulfur-containing polyimide resin is shown in formula I, and the structural formula of the block sulfur-containing polyimide resin is shown in formula II. The adsorbent provided by the invention has adsorption effect on 16 kinds of rare earth elements such as scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and other 16 kinds of rare earth elements. Not interfered by potassium, calcium, sodium, magnesium, aluminum, zinc, iron, tin, lead and other elements. The adsorption process is simple and easy to operate. The adsorbent provided by the invention can be normally used in strong acid, high temperature and high pressure environments, and can regenerate resin materials through a simple desorption process, which is economical and environmentally friendly.

Description

technical field [0001] The invention relates to the application of a sulfur-containing polyimide resin as an adsorbent for 16 kinds of rare earth elements. Background technique [0002] Rare earth is composed of 14 natural elements and several synthetic elements. It is an important national strategic resource, and countries all over the world attach great importance to the reserve of rare earth. Although my country is one of the countries rich in rare earth resources in the world, it uses a large amount. With the increasing influence of rare earths on the national economy and people's livelihood, the country pays more and more attention to rare earth resources. As a non-renewable resource, the recycling, purification and concentration of rare earths have been extensively studied and concerned. [0003] In addition, with the increasing application of rare earths in military, metallurgy, petrochemical, glass ceramics, and agricultural fields, the pollution problems of rare ea...

AI Technical Summary

Problems solved by technology

[0004] Conventional rare earth extraction generally uses steps such as acid dissolution and solvent extraction, using a large amount of reagents, and the steps are complicated

For the concentration of rare earth elements in the solution, the method of solvent volatilization is generally used, which is time-consuming and energy-consuming.

There are few polymer adsorbents for the adsorption of rare earth elements, and broad-spectrum adsorption materials are often used for adsorption, which is poorly targeted and easily interfered by other elements

At the same time, ordinary organic adsorbents often have the disadvantages of being intolerant to organic solvents, strong acids, and high temperatures, and are difficult to be used in the mining of rare earth ores.

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