Solex Scandium Extracting Agent Macroporous Matrix
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Solution Overview
Problem
Current methods for extracting scandium from sulfuric acid solutions, such as phosphorus-containing ion exchange resins and solid extracting agents, face challenges like low dynamic exchange capacity, sorption of unwanted ions, and high production costs, making them inefficient and unprofitable for industrial-scale scandium extraction from in-situ leaching solutions.
Innovation Solution
A method involving a mixture of di-2-ethylhexylphosphoric acid, styrene, divinylbenzene, tri-n-octylphosphine oxide, tributyl phosphate, and isododecane is used to produce a solid extracting agent (Solex) with increased dynamic exchange capacity by forming open macropores and optimizing complex formation with scandium, enhancing sorption kinetics and reducing viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If phosphorus-containing ion exchange resins and solid extracting agents are used for scandium extraction, then scandium can be extracted from sulfuric acid solutions, but the dynamic exchange capacity is low and unwanted ions are sorbed
Solution Approach 1:
The patent introduces a porous polymer matrix structure with controlled pore sizes to increase the accessible surface area and functional groups for scandium extraction. The porous structure allows better diffusion of scandium ions while maintaining selectivity through the specific functional groups located in the pore environments.
Solution Approach 2:
The patent creates a composite material combining polymer matrix with specific functional groups (carboxyl, phosphonic acid, or amino groups) to achieve both high dynamic exchange capacity and selectivity. The composite structure integrates the mechanical stability of the polymer with the chemical affinity of the functional groups for scandium.
2Productivity
If polymer impregnated sorbents are used for scandium extraction, then extraction can be performed, but the extracting agent tends to elute into the mobile phase
Solution Approach 1:
The patent applies local quality by incorporating extracting agents specifically within the polymer matrix structure rather than as separate impregnated layers. The extracting agents are locally positioned within the porous matrix, creating strong local interaction sites that prevent elution while maintaining extraction efficiency.
Solution Approach 2:
The patent develops a composite structure where the extracting agent is integrated into the polymer matrix as a single unified material. This integration prevents the extracting agent from separating or eluting into the mobile phase while maintaining its extraction function, thus reducing substance loss.
3Productivity
If conventional solid extracting agents are used, then scandium extraction is achieved, but production costs are high and the process is unprofitable
Solution Approach 1:
The patent optimizes parameters such as polymer molecular weight, crosslinking density, functional group concentration, and pore size distribution to achieve high scandium recovery at lower production costs. By carefully controlling these parameters, the patent reduces material and processing costs while maintaining high extraction efficiency.
Solution Approach 2:
The patent develops a solid extracting agent with optimized structure that can be produced cost-effectively and used for extended periods. The material is designed to maintain high performance over its service life, reducing the need for frequent replacement and lowering overall production costs for industrial-scale operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resulting Solex exhibits a significantly higher dynamic exchange capacity for scandium, allowing for efficient extraction under high loads and increased scandium recovery per unit volume of resin, thereby improving the process's profitability and reducing resin usage.
Implementation Method 1
phosphorus-containing ion exchange resins... are known to be used for extraction of scandium
Implementation Method 2
the resulting sorbent has a much higher affinity for scandium than for iron (III)... high affinity for scandium
Data Source
AI summary
The invention relates to a composition and method for producing a solid extracting agent for extraction of scandium from sulfuric acid solutions.There is provided a solid extracting agent (Solex) for extraction of scandium from scandium-containing solutions comprising a styrene-divinylbenzene matrix with di-(2-ethylhexyl) phosphoric acid. The extracting agent further comprises tri-n-octylphosphine oxide, tributyl phosphate, isododecane, in the following ratio of components, wt. %: di-(2-ethylhexyl) phosphoric acid 32.0-37.5, tri-n-octylphosphine oxide 4.2-8.0, tributyl phosphate 0.8-1.7, isododecane 16.7-20.0, the remainder styrene-divinylbenzene, with the styrene/divinylbenzene ratio in the matrix equal to 75-80 to 20-25 wt. %. There is also provided a method of producing the Solex. The technical result is the production of a scandium-selective Solex with a high dynamic exchange capacity.