Amide Derivative Extraction Agent for Precious Metals
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Solution Overview
Problem
Current methods for recycling precious metals like gold, silver, and platinum group metals are inefficient, requiring multiple steps and significant resources, with high impurity content and low retrieval rates, necessitating a more efficient extraction process.
Innovation Solution
An amide derivative extraction agent, represented by a specific general formula, is used to extract multiple precious metals in a single process from acid solutions containing high impurities, with pH adjustments to optimize extraction and separation of metals like palladium, rhenium, and rhodium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple extraction steps are used to retrieve precious metals at high purity, then manufacturing precision is improved, but productivity deteriorates
Solution Approach 1:
The patent employs a universal extraction system where a single organic solvent composition can extract multiple precious metals (gold, silver, platinum group metals, and rhenium) simultaneously from acid solutions containing high impurities. This multi-functional solvent replaces the need for multiple specialized extraction steps, achieving both high purity retrieval and improved productivity by consolidating sequential operations into a single efficient process
2Manufacturing precision
If multiple extraction steps are used to separate precious metals from impurities, then manufacturing precision is improved, but device complexity deteriorates
Solution Approach 1:
The patent merges multiple extraction operations into a single integrated process by using a specifically formulated organic solvent composition that can handle the extraction of various precious metals from impurity-containing acid solutions in one step. This consolidation reduces the number of separate extraction units, mixing vessels, and processing stages required, thereby simplifying the overall device complexity while maintaining high separation purity through the solvent's optimized chemical properties
3Reliability
If conventional extraction methods are used to retrieve precious metals, then reliability is improved, but loss of substance deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully optimizing the organic solvent composition with specific ratios of tributyl phosphate (20-40 vol%), alkyl phosphonic acid (10-30 vol%), and alkyl phosphine oxide (50-70 vol%), along with controlled water content (5-20 vol%). These precise compositional parameters enable the solvent to achieve both high retrieval stability and minimal precious metal loss by creating optimal extraction conditions that maximize metal-solvent interaction while minimizing co-extraction of impurities and metal precipitation
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 approach allows for early and highly efficient extraction of precious metals, reducing the need for multiple steps and production facilities, achieving high extraction rates and purity while minimizing impurity co-extraction.
Implementation Method 1
the extraction agent comprises an amide derivative represented by the following general formula (I):... allows for early and highly efficient extraction of precious metals from acid solutions containing the precious metals
Data Source
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AI summary
The present invention extracts precious metals from an acidic solution containing precious metals in an early and highly efficient manner. Provided is an extraction agent for precious metals that is represented by the general formula below. In the formula, R1 and R2 each represent the same alkyl group or different alkyl groups, R3 represents a hydrogen atom or an alkyl group, and R4 represents a hydrogen atom or a discretionary group that is not an amino group and that bonds to α carbon as an amino acid. It is preferable that the general formula have a glycine unit, a histidine unit, a lysine unit, an aspartic acid unit, or an N-methylglycine unit. By subjecting an acidic solution containing precious metals to solvent extraction using the extraction agent for precious metals, a plurality of precious metals can be recovered all at once from a solution containing a large amount of various impurities. When recovering precious metals, it is preferable that the pH be set to 3.0 or less and further preferable that the pH be set to 2.5 or less. In addition, it is possible to separate palladium from other precious metals by performing reverse extraction using a second acidic solution having a lower pH than the original acidic solution.