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Title: Anti-explosive waterproof limestone dusts to be applying in coal mines

Abstract:

Waterproof lime dust used in coal mines is an important element in the system of protection against explosions. This is one of the oldest methods used to prevent coal dust explosions and, according to an expert’s opinion, it will remain so for a long time. T he work is a summary of research on the development of a new method of producing waterproof limestone dust to use it as an anti-explosive powder in coal mines. The typical method of hydrophobic dust production (milling limestone with stearic acid) is no longer profitable due to the restructuring of the mining industry. The main research was conducted on raw materials traditionally used during the production of anti-explosion powder, namely limestone meal with a grain size diameter equal to 80 μm (Czatkowice Limestone Quarry) and stearic acid as a modifier. Silicone preparation and bituminous preparation (Bitumenovoranstrich) were used as additional modifiers. The hydrophobization process was conducted with the use of different techniques: from stearic acid ether solution, from stearic acid vapor, from methyl silicone resin or bituminous preparation solutions. A series of research on modified powders to determine hydrophobization and flow properties was conducted. Depending on method of hydrophobization, the test of “floating on water”, the extraction of stearic acid was carried out, water contact angles on compacted material were determined, the thermal decomposition of powder was made. The increase in moisture after wet storage was indicated. The flow properties of powders were measured with the use of the Powder Characteristics Tester. The evaluation of the suitability of each hydrophobization methods in achieving the intended purpose was valued.

Place of publishing:

More info at Journal site:

https://min-pan.krakow.pl/wydawnictwo/czasopisma/zeszyty-naukowe-instytutu-surowcami-mineralnymi-i-energia-pan/
https://min-pan.krakow.pl/wydawnictwo/wp-content/uploads/sites/4/2018/02/Wskazowki-ZN-ang-2018.pdf

Contact:

Mineral and Energy Economy Research Institute of the Polish Academy of Sciences
J. Wybickiego 7A, 31-261 Kraków,
Phone: (+48) 12 632 33-00, Fax: +48 12 632 35-24,
Email: lidia.gawlik@min-pan.krakow.pl

Editors:

Editorial Board

  • Editor-in-Chief: Krzysztof Galos
  • Deputy Editor-in-Chief: Lidia Gawlik (section: Mineral resources management)
  • Editorial Secretary: Zbigniew Grudziński (section: Fuels and energy)
  • Deputy Editorial Secretary: Zenon Pilecki (section: Mining and geoengineering)
  • Statistical Editor: Jacek Mucha
Publishing Committee
  • Emilia Rydzewska – linguistic editor (Polish)
  • Michelle Atallah – linguistic editor (English)
  • Barbara Sudoł – technical editor

Identifier:

oai:journals.pan.pl:113785

Subject and keywords:

waterproof anti-explosive limestone dust

Object collections:

Last modified:

Feb 15, 2021

In our library since:

Sep 11, 2019

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https://journals.pan.pl/publication/130308

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Przeciwwybuchowe wodoodporne pyły wapienne do zastosowania w kopalniach węgla kamiennego Feb 15, 2021

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The preliminary stage of asphalt mixture production involves the drying and dedusting of coarse aggregates. The most common types of coarse aggregates used are limestone and basalt. In the process of drying and dedusting the dryer filter accumulates large quantities of waste in the form of mineral powder. This paper introduces an investigation into limestone powder waste as a potential microfiller of polymer composites. Physical characteristics such as the granulation the of powder collected from the filter - in terms of the season of its collection and the type of input materials used - were analysed. A scanning electron microscope (SEM) was used for the investigation described within this paper. The obtained results were compared against those of other materials which can be used as polymer composites microfillers.
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The introduction of the sustainable development elements in the construction industry leads to finding new ways of using waste minerals that are difficult in storage and recycling. Coal combustion products have been already introduced into building materials as a part of cement or concrete but they have been thought insufficiently compatible with the polymer-cement binders [7]. The paper presents results of the mechanical properties of polymer-cement composites containing two types of mineral additives: waste perlite powder that is generated during the perlite expanding process, and calcium fly ash which is the byproduct of burning coal in conventional furnaces. Mechanical tests of polymer-cement composites modified with wastes were carried out after 28 and 90 days of curing. As a part of preliminary study specific surface area and particle size distribution of mineral wastes were determined.
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WATERPROOF ANTI-EXPLOSIVE POWDERS FOR COAL MINES

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Modelling of Limestone Calcination for Optimisation of Parallel Flow Regenerative Shaft Kiln (PFR), Case Study: Iran Alumina Plant

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Keywords Calcination PFR kiln Limestone Dust Blocking ASTM C110 Standard Method
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Authors and Affiliations

Hosseinali Mirzaei
1
ORCID: ORCID
Mohammad Noaparast
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ORCID: ORCID
Hadi Abdollahi
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ORCID: ORCID
  1. School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran

New sorbents for removal of petroleum-derived pollution on the basis of expanded perlite

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Keywords sorbents perlite hydrophobic oil-derived pollutants
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Abstract

New hydrophobic sorbents were developed to remove oil-derived pollutants. The process of hydrophobization was conducted by the application of stearic acid and the commercially available silicone agent Sarsil H. Three fractions of expanded perlite were studied, including the P100F fraction, which is a waste product during the processing of perlite. By determining the beneficial influence of the modifiers upon the selected sorption properties of various fractions of perlite one stated that there is a possibility to apply the modified materials, as sorbents for the removal of petroleum-derived pollution. The process of hydrophobization significantly enhanced the hydrophobic properties of all modified materials. All samples after modification were characterised by lesser absorbability and significantly greater capability of the adsorption of diesel oil from the soil and water surface in comparison with raw samples. One extended the range of the products to remove oil-derived pollutants not only in the context of various means of modification methods and modifying substances but one also demonstrated the possibility of the application of fine-grained fraction of P100F perlite as a sorbent for the removal of petroleum-derived pollutions.
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Authors and Affiliations

Elżbieta Vogt
1
ORCID: ORCID
Otmar Vogt
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  1. AGH University of Krakow, Faculty Energy and Fuels, al. Mickiewicza 30, 30-059 Cracow, Poland
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Hydrophobization of diatomaceous earth used to remove oil pollutants

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Keywords hydrophobization diatomaceous earth oil pollutants
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Abstract

Contamination of the natural environment with petroleum pollution is still a frequent and particularly dangerous phenomenon, thus there is a need to remove these pollutants. Various types of mineral sorbents (silicate minerals, zeolites, perlite, diatomite, clay rocks) are highly valued in remediation processes due to their affordable, big selectivity and high efficiency. However, many sorbents are not resistant to moisture, which limits their use. The hydrophobization process improves the effectiveness of sorbents used in a humid environment. The DAMSORB produced by IM-POL was hydrophobized with a methanolic stearic acid solution. The use of cheap stearic acid as a modifier is economically advantageous. The evaluation of the hydrophobic properties of the modified material was performed on the basis of the results obtained from the tests: water absorption, floating on the water surface and the contact angles were determined. Tests of the sorption of petroleum-derived compounds were performed on the basis of three procedures: in accordance with the technical sheet of the leading producer of hydrophobic sorption materials in Poland, the Westighouse’s method in the oil layer and the Westighouse’s method on a flat surface. The modified sorbent floats on the surface of the water very well. The average value of the contact angle for the modified sample is 104 degrees. Material is super hydrophobic. In the water environment, the hydrophobized samples have a higher absorption capacity in relation to oil contaminations compared to the raw material. Features of the modified sorbent, such as good buoyancy on the water surface, low affinity to water and better absorption of oil from the solution, make it possible to use the material to remove petroleum contamination from water and highly moist surfaces.
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Elżbieta Vogt
1
ORCID: ORCID
Karolina Topolska
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  1. AGH University of Science and Technology, Kraków, Poland

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The article presents the results of the research on thermal actions on the materials occurring in the cross section along the depth of the bridge deck and bituminous pavement during its construction. The impulse to curried out the research was the need to explain the causes of the blistering of bituminous waterproofing membranes and asphalt pavements often observed on the bridge decks. The paper presents the examples of such failures and the analyses of possible mechanisms of the phenomenon. Research indicates a significant influence of all technological processes on the temperature of materials in the cross section as well as daily temperature changes. The probability of initiation of reactions between concrete components with gaseous products has been confirmed in such conditions. The susceptibility of bituminous materials to gas emission and blistering is the subject of a separate study. The research was part of a research project carried out under the contract INNOTECHK3/IN3/50/229332/NCBR /14 [13].
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B. Chmielewska
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Basalt Weathering Crust from Rutki near Niemodlin (Opole Voivodeship) – opportunities for its current utilization and remarks on its former use

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Gospodarka Surowcami Mineralnymi - Mineral Resources Management | 2024 | vol. 40 | No 2 | 69-87 | DOI: 10.24425/gsm.2024.150822
Keywords basalt weathering crust smectite specific surface sorption waterproofing
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In contrast to the western part of the Lower Silesia, information about the basalt-derived weathering crusts occurring in the Opole region is rather limited. However, in 2018, significant volumes of such regolith (about 20,000 m3) were discovered during development works in the NW part of the Rutki Quarry near Niemodlin. This weathering crust is rich in clay minerals and represents a smectite- kaolinite mixture with some halloysite, the latter being a poorly ordered member of the kaolinite group. The minerals of the smectite group contain in their interlayer spaces bivalent cations (calcium and magnesium), which is the most often case in the nature. The mineral composition of the regolith mass is supplemented by iron-containing phases, i.e. goethite and magnetite, and traces of phosphate mineral – crandallite. A significant amount of clay minerals, particularly those belonging to the smectite group and halloysite, results in high value of the specific surface area (up to 100 m2/g) of the studied crust. Such favorable property of the crust makes it a promising sorptive raw material that can be applied, even in an unprocessed form, for waterproofing. It must be emphasized that the sorption properties of basalt weathering crusts were noticed some centuries ago in the western part of Lower Silesia, where medicine called terra sigillata was produced from them. Moreover, the crust from Rutki was also used in the XIXth century, in a ceramic manufacture located in nearby Tułowice, where the so-called “Silesian black porcelain” was produced.
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Authors and Affiliations

Piotr Wyszomirski
1
ORCID: ORCID
Tadeusz Szydłak
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ORCID: ORCID
Tomasz Zawadzki
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Marcin Baranowski
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  1. AGH University of Krakow, Poland
  2. Kopalnie Odkrywkowe Surowców Drogowych SA, Niemodlin, Poland
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