Application of sulfur-containing polyimide resin as rare earth element adsorbent

Abstract

The invention discloses applications of a sulfur-containing polyimide resin as a rare earth element adsorbent, wherein the sulfur-containing polyimide resin is random sulfur-containing polyimide resinor block sulfur-containing polyimide resin, the structural formula of the random sulfur-containing polyimide resin is represented by a formula I, and the structural formula of the block sulfur-containing polyimide resin is represented by a formula II. According to the invention, the adsorbent provided by the invention has an adsorption effect on 16 rare earth elements such as scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium, and the adsorption process is not interfered by elements such as potassium, calcium, sodium, magnesium, aluminum, zinc, iron, tin, lead and the like, so that the adsorption process is simple and convenient to operate; and the adsorbent provided by the invention can be normally used in strong acid, high-temperature and high-pressure environments, and the resin material can be regenerated through a simple desorption process, so that the adsorbent is economic and environment-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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