Copper/Tin Oxalate Conversion Using Mild Chemical Precipitation
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Solution Overview
Problem
Current methods for treating cupric oxalate and stannous oxalate from waste liquids in circuit board manufacturing require high-temperature decomposition, posing safety hazards and high energy consumption, which discourages their widespread adoption in industrial processes.
Innovation Solution
A method involving chemical reactions with hypochlorite or alkaline substances at mild conditions to convert cupric and stannous oxalates into copper and tin compounds, followed by solid-liquid separation to produce reusable raw materials, utilizing sodium or potassium-based oxidizing agents and alkaline solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature decomposition is used to treat cupric oxalate and stannous oxalate, then copper and tin source materials can be obtained, but safety hazards increase and energy consumption rises
Solution Approach 1:
The patent changes the reaction conditions from high-temperature decomposition to mild-temperature chemical reactions. Specifically, it uses hypochlorite or alkaline substances to react with cupric oxalate and stannous oxalate at ambient or near-ambient temperatures, transforming the physical-chemical parameters of the treatment process to eliminate the need for high-temperature equipment while maintaining effective conversion to copper and tin source materials
Solution Approach 2:
The patent replaces the thermal decomposition mechanism with chemical reaction mechanisms. Instead of using heat energy to break down the oxalate compounds, the invention employs chemical reagents (hypochlorite or alkaline substances) that react with the oxalates to release copper and tin compounds, substituting a chemical transformation pathway for a thermal one
2Ease of manufacture
If high-temperature decomposition is used to treat cupric oxalate and stannous oxalate, then copper and tin source materials can be obtained, but the process complexity and safety hazards increase
Solution Approach 1:
The patent fundamentally changes the operating parameters from high-temperature range to mild-temperature range, eliminating the need for specialized high-temperature equipment, temperature control systems, and safety infrastructure. The chemical reactions proceed effectively at or near ambient temperatures, greatly simplifying the manufacturing setup and operational procedures while improving safety
Solution Approach 2:
The patent employs readily available, inexpensive chemical reagents (hypochlorite or alkaline substances) that can be easily handled and disposed of, replacing the need for expensive, complex high-temperature processing equipment. The reagents work effectively in simple aqueous solutions, making the process accessible to ordinary manufacturing facilities
3Quantity of substance
If conventional high-temperature decomposition is used, then copper and tin materials are produced, but the production cost increases
Solution Approach 1:
The patent changes the energy input parameter from high-temperature thermal energy to chemical reaction energy at mild temperatures. This parameter change eliminates fuel costs, reduces equipment depreciation, and lowers operational complexity, directly reducing production costs while maintaining effective production of copper and tin source materials
Solution Approach 2:
The chemical reactions employed in the patent are self-propagating at mild temperatures, requiring minimal external energy input. The hypochlorite or alkaline substances react with the oxalates to drive the decomposition and release of copper and tin compounds without needing continuous external heating, making the process energy-efficient and cost-effective
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 eliminates high-temperature processing, enhancing safety, reducing energy consumption, and enabling cost-effective, environmentally friendly production of copper and tin source materials directly from oxalates, suitable for industrial reuse.
Implementation Method 1
approach 1: allowing cupric oxalate and/or stannous oxalate to undergo a chemical reaction with a hypochlorite in a hypochlorite-containing aqueous solution to produce a copper compound-containing and/or tin compound-containing precipitate, which is accompanied by release of carbon dioxide
Implementation Method 2
approach 2: allowing the cupric oxalate and/or the stannous oxalate to undergo a chemical reaction in a solution including an alkaline substance to produce a copper compound-containing and/or tin compound-containing precipitate
Implementation Method 3
subjecting a solid-liquid mixture produced after the chemical reaction in the step (1) to solid-liquid separation to produce a filter residue A and a filtrate B
Data Source
AI summary
Provided is a method and apparatus for extracting a copper/tin source material from an oxalate of copper and/or tin. The method includes the following steps: (1) approach 1: allowing cupric oxalate and/or stannous oxalate to undergo a chemical reaction with a hypochlorite in a hypochlorite-containing aqueous solution to produce a copper compound-containing and/or tin compound-containing precipitate, which is accompanied by release of carbon dioxide; and/or approach 2: allowing the cupric oxalate and/or the stannous oxalate to undergo a chemical reaction in a solution including an alkaline substance to produce a copper compound-containing and/or tin compound-containing precipitate, where the alkaline substance includes a potassium-containing alkaline substance; and (2) solid-liquid separating to produce a filter residue A and a filtrate B, where the filter residue A is the copper compound-containing and/or tin compound-containing precipitate.