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3.2. Senior Chemical Process Engineer-Separation Burlington, MAPhoenix Tailings – 3. Critical Metals Separation /Full Time /On-Site APPLY FOR THIS JOB About Phoenix Tailings Phoenix Tailings is a rapidly growing clean mining and metals production startup dedicated to sustainable and economic critical metals production. Our mission is to be the world's first fully clean mining and metals production company, producing the resources needed for the next generation of our economy. Why Phoenix Tailings  At Phoenix, we believe that nothing great is ever accomplished alone or without the passion of people who push and motivate one another. If you are someone who shares our relentless pursuit of a better future, passion for innovation, and are excited about working with some of the top innovators in the world, then this is the place for you. Our Values  ● You are only crazy if you are wrong, it’s ok to be wrong ● Lead with Compassion ● Be Resourceful ● Listen ● Hustle Who We Are Looking For  Phoenix Tailings is seeking a Senior Chemical Process Engineer who thrives at the intersection of lab work and industrial process development. In this role, you’ll focus on designing, optimizing, and scaling solvent extraction systems to separate and refine rare earth elements — a cornerstone process in our clean production pathway. This is a hands-on, impact-driven role where your contributions will directly accelerate our mission to establish a domestic, sustainable supply of critical materials. Key Responsibilities: Execute solvent extraction process development for rare earth element separation, from bench to pilot scale  Design and operate solvent extraction experiments, evaluating efficiency, selectivity, and stability of reagent systems  Assist in scaling up processes through data analysis, process modeling, and mass/energy balance development  Contribute to the design of pilot-scale equipment including mixer-settlers, columns, or centrifugal contactors  Analyze experimental results to recommend design or operating condition changes that improve process performance  Develop and maintain process documentation including SOPs, PFDs, and process data logs  Support technology transfer from R&D to operations, including commissioning, startup, and troubleshooting  Maintain a strong focus on safety, chemical handling, and environmental stewardship in all aspects of process work  Collaborate with a cross-functional team of chemists, metallurgists, and engineers to deliver on project milestones Qualifications: M.S. or B.S. in Chemical Engineering, Metallurgical Engineering, or related field with 5+ years of industrial experience  Hands-on experience with solvent extraction for rare earth or critical metal separation  Solid understanding of phase separation dynamics, reagent selection, and extraction circuit design  Demonstrated ability to operate lab and pilot-scale chemical processes safely and effectively  Familiarity with process simulation and modeling tools (e.g., METSIM, Aspen, or similar)  Strong analytical and data interpretation skills with an experimental mindset  Experience working in a fast-paced, startup, or R&D-intensive environment is a plus  Excellent communication and technical documentation skills  We offer a competitive compensation package that is based on expertise. We also offer the following benefits: This pay range reflects best estimate for the total cash compensation which includes salary + discretionary bonus for this role. Total package  may vary based on experience and qualifications. Pay Range: $120,000- $160,000 total cash compensation plus equity Healthcare: 100% Medical, dental, and vision coverage for employee Stock Options: Ownership in a fast-growing venture-backed company.  Time Off: Unlimited PTO.  Learning: Learning and development opportunities to grow your skills and career.  At Phoenix Tailings, we have an open culture that values learning, and we are looking to grow the team with enthusiastic individ ... (truncated, view full listing at source)