High Purity Copper Sulfate Production via Solvent Extraction and Activated Carbon
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Solution Overview
Problem
Conventional methods fail to achieve high purity copper sulfate with impurity levels of Ag, As, Sb, Bi, and undissolved residues below 1 wtppm and 100 residues/L, respectively, necessary for preventing contamination and ensuring electrical conductivity in semiconductor electroplating solutions, as these impurities can lead to hard and brittle films and inferior conductivity.
Innovation Solution
Dissolving commercially available copper sulfate crystals in purified water or acid followed by solvent extraction and active carbon treatment to remove impurities, including Ag, organic matter, and undissolved residues, and subsequent recrystallization to achieve high purity copper sulfate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional purification methods are used, then the process is simple, but the purity level cannot reach 99.99 wt % or higher
Solution Approach 1:
The purification process is divided into multiple sequential stages: dissolution in purified water or acid, solvent extraction to remove organic impurities, active carbon treatment to adsorb metal impurities, and recrystallization. Each stage targets specific impurity types, achieving cumulative purification效果 that reaches 99.99 wt % or higher purity level
Solution Approach 2:
Purified water or acid serves as an intermediary medium to dissolve crude copper sulfate crystals and facilitate impurity removal. The solvent extraction system uses intermediary solvents to selectively extract organic impurities, while active carbon acts as an intermediary adsorbent for metal impurities like Ag, As, Sb, and Bi
2Manufacturing precision
If impurity removal is intensified to achieve 99.99 wt % purity, then the quality improves, but the production cost increases
Solution Approach 1:
The method optimizes parameters such as dissolution temperature, solvent extraction conditions, active carbon dosage, and recrystallization temperature to achieve maximum impurity removal efficiency. By controlling these parameters, the process achieves 99.99 wt % purity while minimizing reagent consumption and energy usage, thereby controlling production costs
3Manufacturing precision
If multiple purification steps are implemented, then impurity removal efficiency improves, but the processing time increases
Solution Approach 1:
The purification process maintains continuous operation through sequential steps where the output of one stage feeds into the next. The solution undergoes continuous dissolution, solvent extraction, active carbon treatment, and recrystallization without interruption, ensuring consistent impurity removal efficiency while minimizing idle time between operations
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
The method efficiently removes impurities to achieve copper sulfate purity of 99.99 wt % or higher, reducing the risk of contamination and maintaining electrical conductivity, thus preventing defects in semiconductor wiring and improving manufacturing efficiency at a low cost.
Implementation Method 1
dissolving commercially available copper sulfate crystals in purified water or acid
Implementation Method 2
subjecting this to solvent extraction
Implementation Method 3
active carbon treatment in order to realize recrystallization
Implementation Method 4
subjecting this to solvent extraction and thereafter to active carbon treatment in order to realize recrystallization
Data Source
AI summary
Provided are high purity copper sulfate wherein the content of Ag impurities is 1 wtppm or less, and having a purity of 99.99 wt % or higher, and a manufacturing method of high purity copper sulfate including the steps of dissolving crude copper sulfate crystals or copper metal, and subjecting this to active carbon treatment or solvent extraction and active carbon treatment in order to realize recrystallization. The present invention aims to provide a manufacturing method of high purity copper sulfate capable of efficiently removing impurities at a low cost by dissolving commercially available copper sulfate crystals in purified water or acid and thereafter subjecting this to the refining process, and high purity copper sulfate obtained thereby.