Tin and Lead Extraction via Methanesulfonic Acid Electrolysis
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Solution Overview
Problem
Current hydrometallurgical processes for extracting tin and lead from waste are hindered by metal interference and require constant metal concentrations and predetermined deposition thicknesses, making them inefficient for recovering these toxic elements from electrically conductive mixtures.
Innovation Solution
A method involving selective electrolixiation and direct electrodeposition using a methanesulfonic acid solution with tin and lead methanesulfonates, allowing extraction without monitoring metal concentrations and achieving deposition on a cathode by applying an electric current, utilizing a sacrificial anode formed from the conductive mixture itself.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional galvanoplasty methods are used for depositing tin, then good quality deposition is achieved, but the metal concentrations in the baths must be kept constant and predetermined deposition thickness is required
Solution Approach 1:
The patent uses a sacrificial anode made from the electrically conductive mixture itself, which automatically dissolves to replenish metal ions in the electrolyte. This self-regulating mechanism eliminates the need for manual concentration monitoring and maintenance, while the process naturally controls deposition thickness based on circuit completion requirements.
Solution Approach 2:
The patent extracts and removes toxic metals (tin and lead) from the electrically conductive mixture through selective electro-lixiviation. By taking out these harmful elements first, the process enables subsequent recovery of other valuable metals without interference, solving the concentration control problem by eliminating the problematic metals entirely.
2Productivity
If tin and lead are extracted from electrically conductive mixtures using conventional methods, then metal recovery is achieved, but the process is hindered by metal interference and requires constant concentration monitoring
Solution Approach 1:
The sacrificial anode system automatically maintains electrolyte composition by dissolving at a rate that matches metal deposition. This self-regulating mechanism eliminates the need for operational personnel to monitor or adjust metal concentrations, greatly simplifying operation while maintaining high extraction efficiency for tin and lead.
Solution Approach 2:
The patent changes the chemical parameters of the electrolyte by using methanesulfonic acid and methanesulfonate salts, which provide high solubility for metal complexes. This parameter change enables efficient extraction of tin and lead without the concentration control issues of conventional systems.
3Manufacturing precision
If sacrificial anodes of high purity are used for tin deposition, then good deposition quality is achieved, but the anode cost increases and purity requirements are stringent
Solution Approach 1:
The patent converts the harmful electrically conductive mixture containing toxic metals into a beneficial sacrificial anode material. By using this waste mixture as the anode, the system eliminates the need for expensive high-purity anodes while the selective electro-lixiviation ensures only tin and lead are extracted, maintaining deposition quality without stringent purity requirements.
Solution Approach 2:
The patent changes the chemical environment by using methanesulfonic acid-based electrolyte, which provides selective complexation with tin and lead. This parameter change enables the use of impure anode material while still achieving good deposition quality through selective extraction of target metals.
4Productivity
If conventional electro refining methods are used, then metal recovery is achieved, but the process requires checking metal concentrations and predetermined deposition thickness
Solution Approach 1:
The sacrificial anode system self-regulates the metal ion concentration in the electrolyte through controlled dissolution. This eliminates the need for concentration monitoring and measurement, as the system automatically maintains optimal conditions for tin and lead recovery, simplifying the process while maintaining high productivity.
Solution Approach 2:
The patent extracts tin and lead through selective electro-lixiviation using methanesulfonic acid-based electrolyte. This extraction method eliminates the need for concentration monitoring because the sacrificial anode automatically replenishes metals at the same rate they are deposited, creating a self-balancing system.
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
Enables efficient extraction and recovery of tin and lead from electrically conductive mixtures without constant concentration checks, allowing for variable deposition morphology and eliminating the need for predetermined thickness, with high solubility and recoverability of metals.
Implementation Method 1
applying an electric current between the anode and cathode in order by oxidation to lixiviate the tin and/or lead of the anode
Implementation Method 2
an electrolytic method for extracting tin and/or lead contained in an electrically conductive mixture derived from waste
Implementation Method 3
direct electrodeposition of the tin and/or lead on an electrode
Implementation Method 4
allow the deposition on the cathode of the tin and/or lead initially contained in the electrically conductive mixture
Data Source
AI summary
The invention related to a method for extracting tin and/or lead contained in an electrically conductive mixture derived from waste, using a solution comprising methane sulphonic acid as an electrolytic solution.