Amide Derivative Indium Extraction Agent for Low pH Separation
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Solution Overview
Problem
Current methods for extracting indium from acidic solutions containing zinc are inefficient, particularly at low pH levels, requiring costly neutralization and multiple steps, and struggle to selectively separate indium from zinc without cadmium.
Innovation Solution
An indium extraction agent comprising amide derivatives, such as glycine, histidine, lysine, aspartic acid, and normal-methylglycine amide derivatives, is used for solvent extraction, adjusting the pH to specific ranges to selectively extract indium from acidic solutions and perform back extraction to isolate indium while inhibiting zinc extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional chelating extraction agents are used in acidic solutions with pH less than 2, then indium extraction is not efficient, but adjusting pH to 2.4-3.6 requires costly neutralization equipment and time
Solution Approach 1:
The invention changes the chemical parameters of the extraction agent by using amide derivatives with specific molecular structures (general formula I) that enable effective indium extraction at low pH values (1.0-3.0), eliminating the need for pH adjustment to 2.4-3.6 and the associated neutralization equipment and time
Solution Approach 2:
The patent employs a simple, cost-effective amide derivative extraction agent that can be used directly in acidic solutions without requiring expensive neutralization equipment, making the process more economical and suitable for industrial application
2Manufacturing precision
If chelating extraction agents with phosphinic acid as ligand are used, then selectivity to zinc in coexistence with cadmium is high, but indium cannot be efficiently obtained when cadmium is not present
Solution Approach 1:
The invention applies local quality by designing amide derivatives with specific molecular structures (general formula I) that create localized chemical environments optimized for indium extraction, providing high selectivity for indium over zinc without requiring cadmium presence, thus resolving the contradiction between selectivity and productivity
3Manufacturing precision
If multiple extraction steps are used to separate indium from zinc, then separation efficiency is improved, but treatment time and costs increase
Solution Approach 1:
The invention extracts only the necessary function by using amide derivatives that provide high indium extraction selectivity in a single step at low pH, eliminating the need for multiple extraction steps and associated neutralization treatments, thus reducing treatment time while maintaining separation efficiency
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
This method allows for efficient indium recovery from acidic solutions with high zinc concentrations at low pH, reducing the number of extraction steps and costs, while maintaining high indium extraction rates and low zinc impurity levels.
Implementation Method 1
indium is extracted from an acidic solution by solvent extraction by an indium extraction agent
Data Source
AI summary
Provided are an extraction agent and extraction method that selectively extract and, at a low cost, recover indium from an acidic solution containing indium and zinc. The indium extraction agent comprises an amide derivative represented by general formula (I). In the formula, R1 and R2 each indicate the same or different alkyl group, R3 indicates a hydrogen atom or an alkyl group, and R4 indicates a hydrogen atom or any given group, other than an amino group, bound to the α-carbon as an amino acid. The general formula preferably has a glycine unit, a histidine unit, a lysine unit, an aspartic acid unit, or an N-methylglycine unit. By extracting indium from an acidic solution containing indium and zinc by means of solvent extraction using the extraction agent, it is possible to selectively extract indium.