Nikolaeva Nadezhda V, Aleksandrova Tatiana N, Chanturiya Elena L, Afanasova Anastasia
Saint Petersburg Mining University, St. Petersburg 199106, Russia.
National Research Technological University "MISiS", Moscow 125009, Russia.
ACS Omega. 2021 Mar 24;6(13):9077-9085. doi: 10.1021/acsomega.1c00129. eCollection 2021 Apr 6.
Analysis of the current technical solutions for the processing of iron ores showed that the high-grade ores are directly exposed to metallurgical processing; by comparison, low-grade ores, depending on the mineralogical and material composition, are directed to beneficiation including gravitational, magnetic, and flotation processes or their combination. Obtaining high-quality concentrates with high iron content and low content of impurities from low-grade iron ores requires the maximum possible liberation of valuable minerals and a high accuracy of separating features (difference in density, magnetic susceptibility, wettability, etc.). Mineralogical studies have established that the main iron-bearing mineral is hematite, which contains 69.02 to 70.35% of iron distributed in the ore. Magnetite and hydrogoethite account for 16.71-17.74 and 8.04-10.50% of the component, respectively; the proportion of iron distributed in gangue minerals and finely dispersed iron hydroxides is very insignificant. Iron is mainly present in the trivalent form-FeO content ranges from 50.69 to 51.88%; bivalent iron is present in small quantities-the FeO content in the samples ranges from 3.53 to 4.16%. The content of magnetic iron is 11.40-12.67%. Based on the obtained results by the investigation of the features of magnetite-hematite ores from the Mikhailovskoye deposit, a technological scheme of magneto-flotation beneficiation was proposed, which allows producing iron concentrates with 69% of iron content and less than 2.7% silicon dioxide for the production of pellets with subsequent metallization.
对铁矿石加工的当前技术解决方案进行分析表明，高品位矿石直接进入冶金加工；相比之下，低品位矿石则根据矿物学和物质成分，进行包括重力、磁选和浮选工艺或其组合的选矿。从低品位铁矿石中获得高铁含量和低杂质含量的高质量精矿，需要尽可能最大限度地分离出有价值的矿物，并具有高精度的分离特性（密度、磁化率、润湿性等方面的差异）。矿物学研究表明，主要的含铁矿物是赤铁矿，矿石中铁的含量为69.02%至70.35%。磁铁矿和水针铁矿分别占该成分的16.71 - 17.74%和8.04 - 10.50%；分布在脉石矿物和细分散氢氧化铁中的铁比例非常小。铁主要以三价形式存在——FeO含量在50.69%至51.88%之间；二价铁含量较少——样品中的FeO含量在3.53%至4.16%之间。磁性铁的含量为11.40 - 12.67%。基于对米哈伊洛夫斯科耶矿床磁铁矿 - 赤铁矿矿石特性的研究结果，提出了磁选 - 浮选选矿工艺方案，该方案能够生产铁含量为69%且二氧化硅含量低于2.7%的铁精矿，用于生产球团并随后进行金属化处理。
