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Tatyana N. Aleksandrova
Tatyana N. Aleksandrova
, Ph.D., Dr.Sci., Professor
Saint Petersburg Mining University
, Ph.D., Dr.Sci., Professor
Saint Petersburg Mining University
Saint Petersburg
Russia
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Articles

Metallurgy and concentration
  • Date submitted
    2021-03-12
  • Date accepted
    2021-04-12
  • Date published
    2021-05-25

Increasing the efficiency of phosphate ore processing using flotation method

The paper presents flotation of two phosphate ore samples of different origin. Statistical analysis was used to study the effect of operating parameters on flotation efficiency. The paper proposes to increase the efficiency of flotation processing of magmatic phosphate ore with a low grade of the valuable component (P 2 O 5 = 10.88 %), containing nepheline and feldspars, by means of direct anionic flotation. Authors present an optimization of anionic flotation using tall oil fatty acids mixed with anionic phospholane as an anionic collector. The effect of adding soda ash to compensate for the influence of calcium cations on technological parameters of P 2 O 5 flotation was examined. The results of studying the flotation of nepheline ore (flotation tailings of magmatic phosphate ore) showed that replacement of phospholane with oxyethylated isotridecanol allowed to obtain a high-quality concentrate. It was estimated that with the addition of Na 2 CO 3 in the amount of 2,000 g/t, a concentrate was obtained with the grade and recovery of phosphorus pentoxide equal to 39.15 and 94.19 %, respectively. The paper proposes to increase the efficiency of flotation processing of sedimentary phosphate ore with a low grade of the valuable component (P 2 O 5 = 22.5 %), containing gypsum and quartz, by means of desliming followed by anionic or cationic reverse flotation. Tall oil fatty acid with anionic phospholane was used as a collector in anionic reverse flotation, and amine was used in cationic reverse flotation. Sodium tripolyphosphate was used as a P 2 O 5 depressant. It was found to be an effective depressant in both anionic and cationic flotation. When analyzing the statistical plan, it was estimated that the maximum grade of the valuable component in the concentrate (P 2 O 5 = 31.23 %) and the recovery to concentrate of 95.22 % were obtained in the chamber product at amine consumption of 950.88 g/t and sodium tripolyphosphate consumption of 500 g/t.

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Tatyana N. Aleksandrova, Abdalla M. Elbendari (2021) Increasing the efficiency of phosphate ore processing using flotation method. Journal of Mining Institute. Vol 248. p. 260-271. DOI: 10.31897/PMI.2021.2.10
Metallurgy and concentration
  • Date submitted
    2020-04-15
  • Date accepted
    2020-05-13
  • Date published
    2020-10-13

Processing of platinum group metal ores in Russia and South Africa: current state and prospects

The presented study is devoted to a comparative review of the mineral raw material base of platinum group metals (PGMs) and technologies of their processing in South Africa and Russia, the largest PGM producers. Mineralogical and geochemical classification and industrial value of iron-platinum and platinum-bearing deposits are presented in this work. The paper also reviews types of PGM ore body occurrences, ore processing methods (with a special focus on flotation processes), as well as difficulties encountered by enterprises at the processing stage, as they increase recovery of the valuable components. Data on mineralogical features of PGM deposits, including the distribution of elements in the ores, are provided. The main lines of research on mineralogical features and processing of raw materials of various genesis are identified and validated. Sulfide deposits are found to be of the highest industrial value in both countries. Such unconventional PGM sources, as black shale, dunites, chromite, low-sulfide, chromium and titanomagnetite ores, anthropogenic raw materials, etc. are considered. The main lines of research that would bring into processing non-conventional metal sources are substantiated. Analysis of new processing and metallurgical methods of PGM recovery from non-conventional and industrial raw materials is conducted; the review of existing processing technologies for platinum-bearing raw materials is carried out. Technologies that utilize modern equipment for ultrafine grinding are considered, as well as existing reagents for flotation recovery; evaluation of their selectivity in relation to platinum minerals is presented. Basing on the analysis of main technological processes of PGM ore treatment, the most efficient schemes are identified, i.e.,gravity and flotation treatment with subsequent metallurgical processing.

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Tatyana N. Aleksandrova, Cyril О’Connor (2020) Processing of platinum group metal ores in Russia and South Africa: current state and prospects. Journal of Mining Institute. Vol 244. p. 462-473. DOI: 10.31897/pmi.2020.4.9
Metallurgy and concentration
  • Date submitted
    2016-10-06
  • Date published
    2016-01-01

Technological aspects of extraction of precious and rare metals from carbonaceous rocks

The results of mineralogical, geochemical and technological research of black shale rocks are given. It is proved that black shales are now regarded as a new promising and innovative source of precious and rare-metal raw materials. It is pointed out that 3 wt. % of black shales samples is colloid-salt fraction (nanofraction) with a particle size less than 1000 nm and it can be extracted with water under specially chosen conditions. The use of water instead of chemically active reagents guarantees the absence of dissolved mineral matrix and clearly shows the colloidal salt component in samples. The results determine the direction of creating some new methods and technologies of carbonaceous feed dressing for integrated development of solid minerals in the mining and oil producing regions of Russia.

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T. N. Aleksandrova, E. G. Panova (2016) Technological aspects of extraction of precious and rare metals from carbonaceous rocks. Journal of Mining Institute. Vol 217. p. 72.
Metallurgy and concentration
  • Date submitted
    2016-10-07
  • Date published
    2016-04-01

Key directions in processing carbonaceous rocks

Mathematical statistics techniques and the data from laboratory mineral and technological studies of samples were used to identify the most common natural and technological associations of microelements in carbonaceous rocks which could be of industrial value if extracted in the form of commercial products. The discovered structures of spheroidal and ring ferrocarbonaceous clusters are respective formations of the class of metal fullerens with expressed magnetic properties. Such clusters may serve as construction blocks for new magnetic structures since each of them is a separate magnetic domain. Extracting such structures and their practical use opens the way to future technologies. It is expected to employ such results in the future in the course of designing new techniques and technologies for benefication of carbonaceous raw materials while developing comprehensively solid mineral resources in the mining industry regions of Russia. 

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T. N. Aleksandrova (2016) Key directions in processing carbonaceous rocks. Journal of Mining Institute. Vol 220. p. 568. DOI: 10.18454/pmi.2016.4.568
Metallurgy and concentration
  • Date submitted
    2016-10-07
  • Date published
    2016-04-01

Studying the dependence of quality of coal fine briquettes on technological parameters of their production

The study characterizes the role of coal in the fuel and energy balance of the Far East Region and points out the issue of losses of coal fines in the processes of coal mining, transportation and processing. To solve the problem of losses of coal fines, the mined coal is sorted into different size classes and fuel briquettes are produced from coal fines. Physical foundations are presented in short of briquetting solid combustible mineral resources. The dependences and variations of briquette compression strength limit are studied vs. charge humidity and briquetting pressure. Optimal parameters are retrieved for briquetting coal fines. The principal technological scheme is given of the process of briquette production. The developed technological solutions include sorting regular coal and briquetting coal fines, as well as the involvement of technogenic carbon-containing wastes from the hydrolysis production lines, plus residuals from oil refining. 

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T. N. Aleksandrova, A. V. Rasskazova (2016) Studying the dependence of quality of coal fine briquettes on technological parameters of their production. Journal of Mining Institute. Vol 220. p. 573. DOI: 10.18454/pmi.2016.4.573