GEOLINKS International Conference 2021, Book 2
ECOLOGY AND ENVIRONMENTAL STUDIES
RECYCLING OF IRON ORE PROCESSING WASTES FOR REDUCTION OF INDUSTRIAL IMPACT ON THE ENVIRONMENT
Lead. Researcher PhD Mikhail Khokhulya, Researcher Alexander Fomin, Researcher Svetlana Alekseeva, Lead. Technologist Ilya Karpov
The paper presents the results of the research on the recovery of hematite from stockpiled tailings produced by the mineral processing plant of Olcon JSC (the northern-western Arctic zone of Russia). The authors investigated material composition of tailings samples and determined its granular and mineralogical characteristics. The content of total, magnetic and hematite iron in a sample of the tailings dump material is 8.76%; 1.53% and 3.67% respectively. The technology for hematite concentrate production from the tailings material has been substantiated, including several stages of spiral separation to recover the rough concentrate and its following concentration by a shaking table. The authors have determined optimal conditions for the disintegration of the middlings of the spiral separation, which made it possible to achieve selective liberation of the grains of valuable mineral. A recommended technological flowsheet for the processing of the tailings dump material provides for the production of hematite concentrate with a total iron content of more than 62% and through recovery of hematite iron of about of 76%. Involvement of the tailings in processing will help to reduce the human impact on the environment and improve ecological situation in the plant area.
industrial waste, tailings, hematite, spiral separation