Suspension magnetization roasting on waste ferromanganese ore: A semi-industrial test for efficient recycling of value minerals

As a waste ferromanganese ore resource, unavailable due to conventional technology and thus hoarded in mass quantity, in which it functions as an invaluable recycling value. In the study, an efficient semi-industrial test for recycling manganese and iron was investigated by suspension magnetization roasting, and with the results dem-onstrating that iron concentrate with an average iron grade of 66.60% and an average iron recovery of 93.93%, manganese concentrate with an average manganese grade 46.22% and an average manganese recovery 87.29% could be obtained under conditions of roasting temperature 500 degrees C, reducing agent concentration 45%, reducing agent dosage 12.0 m3/h and the equipment operating continuously and stably for 35 h. Through the suspension magnetization roasting-magnetic separation technology, the weak magnetic hematite, pyrolusite and bixbyite were selectively converted into magnetite and manganosite respectively, and then the magnetite and manganosite were extracted in the magnetic concentrate and magnetic tailings individually. Suspension magne-tization roasting semi-industrial system exhibited stable and efficient performances for the recycling and utiliza-tion of ferromanganese ore. (c) 2021 Elsevier B.V. All rights reserved.

Automated summary

The suspension magnetization roasting technology has been proven to be efficient in recycling manganese and iron, producing high-quality iron and manganese concentrates. This technology selectively converts weakly magnetic hematite, pyrolusite, and bixbyite into magnetite and manganosite, providing a stable and effective method for the utilization of ferromanganese ore.