3.1. Principal Chemical Process Engineer-Separation

Phoenix Tailings • Burlington, MA

5d

About The Position

Phoenix Tailings is seeking a Principal Chemical Process Engineer-Separation to lead the development and optimization of solvent extraction circuits for rare earth element separation. This role involves designing and executing experiments, translating laboratory successes into scalable industrial processes, and owning process documentation. The engineer will drive the selection of reagents and equipment, analyze performance data, and collaborate with cross-functional teams to support plant operations and troubleshooting. Staying current with solvent extraction technologies and rare earth processing trends is crucial for informing process strategy.

Requirements

• Ph.D. or M.S. in Chemical Engineering, Metallurgical Engineering, or related discipline with 8+ years of relevant experience
• Proven expertise in rare earth element/critical metals separation via solvent extraction, including reagent chemistry, process configuration, and optimization
• Hands-on experience with lab-scale and pilot-scale solvent extraction systems, including safety and operational best practices
• Deep understanding of phase equilibria, thermodynamics, and kinetics relevant to solvent extraction
• Demonstrated success in scaling up chemical separation processes from bench to pilot to commercial scale
• Proficiency with process modeling tools (e.g., Aspen, METSIM, or similar)
• Excellent problem-solving skills with a passion for experimental validation and continuous improvement
• Strong written and verbal communication skills, especially in cross-disciplinary environments

Responsibilities

• Lead the development and optimization of solvent extraction circuits for rare earth element separation from both primary and secondary sources
• Design and execute bench- and pilot-scale experiments to evaluate separation efficiency, reagent performance, and system dynamics
• Translate laboratory-scale successes into scalable, industrial processes with a focus on safety, sustainability, and cost-effectiveness
• Own and evolve process flow diagrams (PFDs), mass balances, and P&IDs for solvent extraction systems
• Drive selection and specification of extractants, diluents, and equipment (e.g., mixer-settlers, columns, or centrifugal contactors)
• Analyze separation performance data to identify improvement opportunities and implement process changes
• Collaborate closely with metallurgy, chemical engineering, and operations teams to support plant commissioning and troubleshooting
• Author technical reports, scale-up plans, and design documentation to support commercialization of Phoenix Tailings’ extraction technologies
• Stay at the forefront of solvent extraction technologies and rare earth processing trends to inform and elevate process strategy

Benefits

• 100% Medical, dental, and vision coverage for employee
• Ownership in a fast-growing venture-backed company
• Unlimited PTO
• Learning and development opportunities to grow your skills and career

What This Job Offers

• Job Type: Full-time
• Career Level: Principal