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Evgeniya A. Krasavtseva
Evgeniya A. Krasavtseva
Researcher, Ph.D.
Institute of North Industrial Ecology Problems, Kola Science Centre of the RAS
Laboratory of Nature-Inspired Technologies and Environmental Safety of the Arctic NMC, Kola Science Centre of the RAS
Researcher, Ph.D.
Institute of North Industrial Ecology Problems, Kola Science Centre of the RAS
Apatity
Russia
Laboratory of Nature-Inspired Technologies and Environmental Safety of the Arctic NMC, Kola Science Centre of the RAS

Articles

Geotechnical Engineering and Engineering Geology
  • Date submitted
    2024-03-28
  • Date accepted
    2024-06-03
  • Date published
    2024-07-04

Assessing the effectiveness of sewage sludge in the reclamation of disturbed areas in the Kola subarctic zone (a case study of a sand quarry)

Article preview

An assessment was made of the effectiveness of reclamation using sewage sludge for the accelerated formation of a stable erosion-proof vegetation cover on the unproductive anthropogenic soil of a sand quarry in the context of the Kola North. The experiment, launched in 2017, included three treatments: control – no treatment, experiment 1 – fragmentary (50 %) application of sewage sludge, experiment 2 – continuous application. In the sixth growing season, anthropogenic soil samples were examined, and measurements of CO2 emissions were carried out. It was shown that the application of sewage sludge had a positive effect on the physicochemical and agrochemical properties of the soils: in situ pH and density decreased, hygroscopicity increased, available phosphorus and potassium increased. Significant differences (p < 0.05) were found between CO2 emissions in the control and experimental treatments. The content of organic carbon in the control treatment was lower than in the experimental ones; under fragmentary application of sewage sludge, it was three times lower, and under continuous application, it was nine times lower. Significant (p < 0.05) differences in the content of carbon and nitrogen in cold and hot water extracts between control and treatment samples were found under continuous application of sewage sludge. At the same time, by calculating the C/N ratio, a very low level of nitrogen was found in the humus. The main factors behind the variability of the estimated parameters were identified – the treatment itself and the method of its application, the contribution of the treatment alone was 60 %, the contribution of the application method was 14 %. Taking into account the economic factors, fragmentary application of sewage sludge onto the anthropogenic sand quarry soil is recommended to support the establishment of a stable erosion-proof phytocenosis.

How to cite: Ivanova L.A., Slukovskaya M.V., Krasavtseva E.A. Assessing the effectiveness of sewage sludge in the reclamation of disturbed areas in the Kola subarctic zone (a case study of a sand quarry) // Journal of Mining Institute. 2024. Vol. 267. p. 444-452. EDN FNAPXK
Metallurgy and concentration
  • Date submitted
    2022-06-27
  • Date accepted
    2022-09-09
  • Date published
    2022-11-03

Study of the composition and properties of the beneficiation tailings of currently produced loparite ores

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The increase in demand for rare earth metals and the depletion of natural resources inevitably causes the need to search for alternative unconventional sources of rare metal raw materials. The article presents the results of a study of the composition and properties of the beneficiation tailings of currently produced loparite ores. Sieve, mineralogical, chemical, and radionuclide analyses were carried out. The average content of loparite in tailings was determined. Using scanning electron microscopy, minerals-concentrators of rare earth elements in the loparite ore beneficiation tailings were diagnosed. The distribution of valuable components and thorium in the tailings was determined depending on the particle size class. The radium-thorium nature of radioactivity was established, the values of the effective specific activity of the samples were calculated. We concluded that it is necessary to develop an integrated technology for processing the beneficiation tailings of loparite ore, due to the complex and heterogeneous mineral and chemical composition of the tailings material.

How to cite: Maksimova V.V., Krasavtseva E.A., Savchenko Y.E., Ikkonen P.V., Elizarova I.R., Masloboev V.A., Makarov D.V. Study of the composition and properties of the beneficiation tailings of currently produced loparite ores // Journal of Mining Institute. 2022. Vol. 256. p. 642-650. DOI: 10.31897/PMI.2022.88