Copper Anode Slime Metal Separation via Oxidation Potential Modulation
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Solution Overview
Problem
Current methods for separating valuable metals from copper anode slime suffer from poor selectivity and high energy consumption due to interference between metal elements during the separation process, and existing methods either lack comprehensive element separation or pose environmental risks with chlorine-containing compounds.
Innovation Solution
A separation process based on oxidation potential modulation, using oxidants like H2O2, O2, and O3 to control the redox potential of the leaching solution, allowing for selective leaching and separation of copper, selenium, tellurium, and silver by adjusting the acid concentration and oxidation potential levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional acid leaching is used to transfer multiple metal elements to the leaching solution, then the recovery of valuable metals is achieved, but the separation selectivity deteriorates due to mutual interference between different metal elements
Solution Approach 1:
The patent divides the simultaneous leaching of multiple metals into sequential stages, where different metal elements are leached at different oxidation potential levels. Copper is leached first at lower potential, followed by selenium and tellurium at higher potentials, and silver at the highest potential. This temporal segmentation of the leaching process eliminates mutual interference between metal elements and achieves high separation selectivity while maintaining comprehensive recovery.
Solution Approach 2:
The patent dynamically adjusts the oxidation potential parameter of the leaching solution to control the selective leaching of different metal elements. By varying the oxidation potential within specific ranges (e.g., 0.2-0.4 V for copper, 0.4-0.6 V for selenium and tellurium, and 0.6-0.8 V for silver), the process achieves precise control over which metal elements are leached at each stage, resolving the selectivity issue while maintaining high recovery rates.
2Ease of manufacture
If conventional roasting at 250-350°C is used to prepare anode slime, then the metal elements are made accessible for leaching, but energy consumption increases significantly
Solution Approach 1:
The patent replaces the thermal mechanical process of conventional roasting with a chemical oxidation process using oxidants such as hydrogen peroxide, ozone, or atmospheric oxygen. This substitution eliminates the need for high-temperature heating (250-350°C), dramatically reducing energy consumption while still achieving effective oxidation and accessibility of metal elements for subsequent selective leaching.
Solution Approach 2:
The patent employs strong oxidants including hydrogen peroxide (H2O2), ozone (O3), and atmospheric oxygen (O2) to rapidly oxidize metal elements in the anode slime at ambient or moderate temperatures. This accelerated oxidation process replaces conventional thermal roasting, achieving the same objective of making metals accessible for leaching with significantly lower energy input and without requiring high-temperature equipment.
3Manufacturing precision
If chlorine-containing compounds are used to regulate oxidation potential, then the separation of antimony and tellurium is improved, but environmental harm increases due to Cl2 generation and chlorinated wastewater disposal difficulties
Solution Approach 1:
The patent converts the potentially harmful chlorine-containing compounds into beneficial, environmentally friendly oxidants. Specifically, it replaces chlorine-based oxidants with hydrogen peroxide (which decomposes to water and oxygen), ozone (which decomposes to oxygen), and atmospheric oxygen. These alternative oxidants achieve the same oxidation potential control and metal separation functions without generating toxic Cl2 gas or requiring complex chlorinated wastewater disposal procedures, thus eliminating the environmental harm while maintaining separation effectiveness.
Solution Approach 2:
The patent adopts oxidants such as hydrogen peroxide and ozone that are environmentally benign and can be easily disposed of or decomposed. Hydrogen peroxide decomposes into water and oxygen, and ozone decomposes into oxygen, leaving no persistent harmful substances. This approach replaces chlorine-containing compounds with disposable, eco-friendly oxidants that achieve the required oxidation potential control without creating long-term environmental pollution issues.
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 process enhances the leaching rate and purity of metal elements, achieving >99% leaching rate and >99.9% purity of recovered metals with improved selectivity and environmental sustainability.
Implementation Method 1
adding an oxidant to control an oxidation potential to 400-500 millivolts (mV), and leaching Cu elements; adding an oxidant to control an oxidation potential to 650-850 mV, and leaching Te elements; adding an oxidant to control an oxidation potential to 800-1,200 mV, and leaching Se elements
Implementation Method 2
using oxidants like H2O2, O2, and O3 to control the redox potential of the leaching solution, allowing for selective leaching and separation of copper, selenium, tellurium, and silver
Implementation Method 3
mixing with a solution of thiosulfate with a concentration of 0.025-0.05 mol/L of S2O32− to complex Ag elements
Data Source
AI summary
Disclosed is separation process of valuable metals from copper anode slime based on oxidation potential modulation, belonging to the technical field of industrial solid waste resource utilization. The differences in redox properties of different metal elements are used to precisely regulate the oxidation potential and acidity of the leaching solution by regulating the amount of oxidizing agent and acid added, so as to selectively and graded leaching and separating the copper (Cu), selenium (Se), tellurium (Te), and silver (Ag) metal elements, and the oxidants used are substances such as H2O2, O2 and O3.