Optimization of Dissolution Parameters for GH4738 Scrap via Response Surface Methodology

Area of Science:

• Materials Science
• Electrochemistry
• Chemical Engineering

Background:

• GH4738 scrap, a nickel-based superalloy, presents recycling challenges.
• Efficient dissolution is crucial for sustainable material recovery and reducing environmental impact.

Purpose of the Study:

• To optimize the electrochemical dissolution of GH4738 scrap.
• To achieve a high dissolution rate with minimal energy consumption.
• To identify key parameters influencing the dissolution process.

Main Methods:

• Plackett-Burman design to screen influential factors.
• Steepest ascent method to define optimal operating region.
• Response surface methodology (RSM) for parameter optimization.
• Analysis of Variance (ANOVA) for statistical validation.

Main Results:

• Identified current density, NiCl2 concentration, electrolysis time, and H2SO4 concentration as significant factors.
• Determined optimal conditions for maximizing dissolution rate and minimizing energy consumption.
• Showed that increased NiCl2 concentration reduced breakdown potential.
• Achieved high dissolution efficiency with minimal energy at 1.5 mol/L H2SO4 concentration.

Conclusions:

• The study provides a systematic approach for optimizing GH4738 scrap dissolution.
• Optimized parameters are crucial for efficient material recovery and laboratory sustainability.
• Understanding parameter interactions is key to improving dissolution performance.