Abstract
The paper considers the results of the application of dry magnetic separation on samples of ferruginous quartzites of the Kostomuksha ore field, represented by refractory ore, free-milling ore, and their mixture. The assessment of the influence of the ore texture on the technological parameters of dry magnetic separation indicates their insignificant changes: the yield of the non-magnetic product varies from 12.4 to 13.5%, and the Fetotal content in the magnetic product increases by 1.11–1.14 times. A decrease of at least 15% in the number of harmful impurities was found: S by 16.2–17.3%, SiO2 by 15.5–21.1%, and Al2O3 by 39.1–48.4%. The authors have performed a comparative assessment of the granularity of the initial ore and the magnetic product with the measurement of energy consumption, as well as an analysis of the magnetite liberation on particle sizes of less than 2 mm. It was found that due to the release of a non-magnetic product in the amount of 12.3–14.5%, represented by non-magnetite or weakly mineralized rock varieties, energy consumption for the crushing process is reduced by at least 5%. The mineral liberation assessment showed that mainly free magnetite is contained in the −0.4 mm fineness class. It was found that in the magnetic separation product of the refractory ore sample, the amount of liberated magnetite in the size class −1 + 0 mm increases by 12.1% compared to the initial ore sample. For the free-milling ore sample, the opposite trend is observed: a decrease in the amount of free magnetite by 30.9% in the magnetic product. Analysis of the magnetite liberation in the mixture indicates deterioration in the results obtained during the separate crushing of refractory and free-milling ore and a decrease in the amount of liberated magnetite in the magnetic product by 60% compared to the initial ore.
Highlights
Among the priority activities of the mining and industrial complex and research organizations providing support to the entire technological cycle of deposit operation, the primary is the design and industrial development of innovative technologies aimed at resource and energy conservation, rational use of mineral reserves, environmental safety, and protecting the environment from industrial pollution [1]
Reducing the negative environmental impact of mineral processing waste in this case is provided by reducing the amount of fine-grained tailings, which are the main source of air pollution from the surface of dry beaches of reclamation bays, slopes of dams [9], as well as the possibility of secondary use of dry magnetic separation waste-production of crushed stone used in road repairs, backfilling dams, embankments, filling mined-out space, and production of construction materials
The study of the initial material of iron ore samples from the Kostomuksha and Korpangskoe deposits has shown that their chemical and material composition are almost identical
Summary
Among the priority activities of the mining and industrial complex and research organizations providing support to the entire technological cycle of deposit operation, the primary is the design and industrial development of innovative technologies aimed at resource and energy conservation, rational use of mineral reserves, environmental safety, and protecting the environment from industrial pollution [1]. The use of the pre-concentration process in mineral processing technology does not reduce the total amount of processing waste, but changes its size; namely, it forms a lumpy material of separation waste with a size of 300 to 20 mm and directs it to waste dumps. Reducing the negative environmental impact of mineral processing waste in this case is provided by reducing the amount of fine-grained tailings, which are the main source of air pollution from the surface of dry beaches of reclamation bays, slopes of dams [9], as well as the possibility of secondary use of dry magnetic separation waste-production of crushed stone used in road repairs, backfilling dams, embankments, filling mined-out space, and production of construction materials
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