High-strength rubidium/cesium special-effect adsorbent as well as preparation method and application thereof

Abstract

The invention discloses a high-strength rubidium / cesium special-effect adsorbent as well as a preparation method and application thereof. Epoxy resin gel is taken as a carrier, and amino modified heteropolyacid salt is taken as an adsorption effective component. The preparation method comprises the following steps: (1) dissolving amino silane in a 95% ethanol solvent, stirring to obtain a transparent solution, adding heteropolyacid salt into the solution, mechanically stirring for 1-4 hours, and filtering to obtain amino modified heteropolyacid salt; and (2) adding epoxy resin into the non-active diluent, stirring to obtain a viscous solution, adding the amino modified heteropolyacid salt prepared in the step (1) into the solution, continuously stirring, adding the polyamine cross-linking agent, stirring, and standing to obtain the high-strength rubidium / cesium special-effect adsorbent. The high-strength rubidium / cesium special-effect adsorbent has excellent chemical stability and acid, alkali and salt resistance, is high in rubidium and cesium selectivity and large in adsorption capacity, and is suitable for large-scale dynamic extraction of rubidium and cesium from salt lake brine.

Description

technical field [0001] The invention belongs to the technical field of adsorbent preparation, and relates to the preparation of rubidium / cesium adsorbent, in particular to a high-strength rubidium / cesium special-effect adsorbent and its preparation method and application. Background technique [0002] Rubidium (Rb) and cesium (Cs) are extremely important metal resources, which have important applications in many fields such as medical treatment, optoelectronic devices and catalysis. In nature, in addition to solid minerals such as lepidolite and cesium garnet, rubidium and cesium also exist in liquid resources such as salt lake brine, geothermal water, and oilfield water. For example, the average rubidium content in the brine of Qaidam Salt Lake in Qinghai Province is 10.8 mg L -1. Containing cesium 0.034 mg·L-1, the total reserves are considerable, and the development value is great. [0003] At present, the separation and extraction of rubidium and cesium from salt lake b...

AI Technical Summary

Problems solved by technology

However, silica gel is brittle and low in strength, and the gel network structure is easy to collapse under the action of external force, making it difficult to recycle.

Similarly, the connection strength between the MG blocks (mannuronic acid M-guluronic acid G) in the calcium alginate gel molecule is low, and its gel network structure is also prone to collapse during recycling.

On the other hand, the heteropoly acid salt is only wrapped inside the gel, and has poor binding force with the gel carrier, and it is easy to fall off from the gel carrier, resulting in a decrease in adsorption performance.

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