Amide Derivative Extraction for Copper Lead Separation
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Solution Overview
Problem
Current methods for extracting copper and lead from acid solutions containing high concentrations of manganese are inefficient due to coprecipitation and contamination issues, leading to reduced purity and increased re-refining costs, and lack effective extraction agents for selective separation.
Innovation Solution
The use of an amide derivative extraction agent, such as glycinamide derivatives, in solvent extraction processes with specific pH adjustments allows for the selective extraction of copper and lead from acid solutions containing manganese, nickel, and cobalt, enabling effective separation and purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional precipitation methods are used to extract copper and lead from acid solutions containing manganese, then copper and lead can be precipitated as sulphides, but coprecipitation occurs making it difficult to completely separate nickel, cobalt, and manganese, and copper coexisting with nickel and/or cobalt in the sulphide precipitate reduces purity
Solution Approach 1:
The patent introduces a specific organic solvent system (mixture of carboxylic acid and its ester) as an intermediary medium to enable selective extraction of copper and lead from the acid solution. This solvent system acts as a mediator that preferentially binds copper and lead ions while leaving manganese, nickel, and cobalt in the aqueous phase, thereby achieving clean separation without coprecipitation issues
Solution Approach 2:
The patent exploits differences in extraction behavior of metal ions at specific pH ranges. By controlling the pH of the acid solution and selecting appropriate carboxylic acid/ester combinations, the invention creates optimal conditions where copper and lead are extracted into the organic phase while manganese remains in the aqueous phase, achieving complete separation based on parameter optimization
2Manufacturing precision
If acid-based extraction agents are used for nickel retrieval in solvent extraction, then nickel can be extracted, but manganese is used at high proportion in positive electrode materials and there is no effective extraction agent capable of selectively and effectively extracting nickel from such a system
Solution Approach 1:
The patent changes the chemical parameters of the extraction system by using specific carboxylic acid and ester combinations in particular ratios. This parameter change creates a selective extraction environment where the organic solvent system has different affinity for copper/lead compared to manganese, nickel, and cobalt, enabling selective extraction despite high manganese concentration
Solution Approach 2:
The organic solvent system consisting of carboxylic acid and ester acts as an intermediary that selectively interacts with copper and lead ions. This intermediary medium provides a selective binding environment that distinguishes copper/lead from other metal ions based on their different chemical properties and extraction constants
3Productivity
If electrowinning is employed to retrieve nickel as metal, then nickel can be retrieved, but oxide of manganese becomes deposited on the anode surface to accelerate anode degradation, and colored fine oxide of manganese floats in the electrolyte solution to clog filter cloth and contaminate the metal nickel
Solution Approach 1:
The patent extracts and removes copper and lead from the acid solution using solvent extraction with carboxylic acid and ester. By taking out copper and lead in advance, the subsequent electrowinning process deals with a solution having reduced metal ion complexity, preventing manganese oxide deposition and contamination issues that would otherwise occur during nickel retrieval
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 achieves selective extraction of copper and lead with high efficiency, separating them from manganese and cobalt, thereby improving the purity and reusability of extracted metals and reducing re-refining costs.
Implementation Method 1
subjecting an acid solution containing copper and/or lead and manganese to solvent extraction with a valuable metal extraction agent that contains an amide derivative
Data Source
AI summary
In order to selectively extract copper and/or lead from an acidic solution containing high concentrations of manganese, etc., the valuable-metal extracting agent of the present invention is expressed by general formula (1). In the formula, R1 and R2 each represent the same or different alkyl groups, R3 represents a hydrogen atom or an alkyl group, and R4 represents a hydrogen atom or a given group, other than an amino group, that bonds with an α carbon as an amino acid. In general formula (1), the inclusion of a glycine unit, a histidine unit, a lysine unit, an asparagine acid unit, or a normal methylglycine unit is preferred. When using the extracting agent to extract copper/and lead, it is preferable that the pH of the acidic solution be adjusted to 1.0-5.5 inclusive.