• A combined phase transformation and magnetic separation process effectively separates Fe and Mn from intergrown ferromanganese ore.
• Optimal roasting conditions (600°C, 30 min) and grinding fineness (50% passing <0.074 mm) yield high Fe and Mn grades and recoveries.
• Hematite transforms to magnetite and pyrolusite to manganosite, enabling efficient magnetic separation.
• This clean utilization technology addresses the challenge of complex intergrown ferromanganese ore, reducing resource waste and environmental pollution.