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    Wyświetlanie 1-4 z 4
    Tytuł:
    New method of electrostatic separation of the oxidized iron ore
    Autorzy:
    Idres, A.
    Bouhedja, A.
    Bounouala, M.
    Benselhoub, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/89112.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    iron ore
    electrostatic separation
    reagent-collector
    reagent–depressant
    efficiency
    Opis:
    The complexity of the mineralogical, chemical and exogenous parameters generates a low efficiency of electrical separation of oxidized iron ore. For this purpose, a study was conducted to provide a method for electrostatic separation and to select the chemical reagents. And this, for increasing the contrast of the dielectric separating minerals in the corona discharge field. The reagent-collector used is the auramine with a specific consumption of 0.3 kg/t. Whereas, the reagent depressants is carboxymethyl cellulose mixture with a specific consumption of 0.25 kg/t. From the obtained test results electrical treatment of oxidized iron ore are satisfied for proposed process.
    Źródło:
    Mining Science; 2016, 23; 33-41
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemical treatment of kaolin. Case study of kaolin from the Tamazert– Jijel mine
    Autorzy:
    Chouafa, M.
    Idres, A.
    Bouhedja, A.
    Talhi, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/89198.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    kaolin
    hydrochloric acid
    sulfuric acid
    acetic acide
    Opis:
    The Tamazert-Jijel kaolin deposit is located in eastern Algeria, It was formed during a process of hydro-thermal alteration of feldspars rich in potassium. Kaolin, obtained at the mine, mainly contains varying amounts of impurities such as iron oxide (Fe2O3) and anatase (TiO2). These components negatively affect the quality of the commercial product. This research was performed to improve the quality of kaolin to be used in the paper industry with the goal of reducing the impurities of iron and titanium oxides. Different sized fractions of the original sample were analyzed by XRD. The results obtained showed that the mineralogical composition is: quartz, muscovite, kaolinite, dolomite, albite and orthoclase. Kaolin, like all clays, has a thin dissemination of minerals throughout it. After processing kaolin, the particle size fraction of less than 45μm, corresponding to the liberation mesh size, was retained for purification by chemical treatment with different acids of different concentrations (hydrochloric acid, sulfuric acid, acetic acid), heated to boiling point temperatures. The kaolin samples treated with the various acids above were analyzed by X-ray fluorescence and by XRD. The results obtained from the sample treated with hydrochloric acid show that the iron oxide content of acid is reduced by 1.65% to 0.88%. Meanwhile, the brightness of the sample reached 90% under the effect of the treatment with hydrochloric acid at concentration of 2 mole/dm3.
    Źródło:
    Mining Science; 2015, 22; 171-180
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Air pollution mapping in the Wilaya of Annaba (NE of Algeria)
    Autorzy:
    Kharytonov, M.
    Benselhoub, A.
    Klimkina, I.
    Bouhedja, A.
    Idres, A.
    Aissi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/89046.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    geographical information system
    atmospheric pollution
    industrial activities
    risk assessment
    Annaba
    Opis:
    Poor air quality can pose severe risks to human health and can also influence negatively on the natural environment. Annaba suffers from air pollution due to the industrial activities occurring in the province including, electricity generation, waste incineration, chemistry and other small additional industrial operations. However, mining, steel industry and metallurgy are considered among the most polluting activities. The aim of our research is to assess the risks of air pollution emissions with NO2, SO2, Toluene and Benzene as a result of industrial enterprises activities in Annaba province. The application of geo-graphical information system (GIS) mapping based on automatic monitoring networks of air quality, allows us the assessment of air pollution risks in the studied area. Two zones of air pollution with N02 in the level of 1 MPC has been recorded near the blast furnaces and the steel shop, the second halo of NO2 pollution was fixed over residential infrastructures. Moreover, revealed a tendency to higher content of nitrogen dioxide in the atmosphere of the bigger part of Annaba region. Corresponding to the data obtained from stationary monitoring networks, the annual average concentration of SO2 was significantly lower than the MPC. Based on GIS maps there are two areas with SO2 pollution inside the territory of El Hadjar metallurgical plant. A significant increase in concentrations of NO2 in the atmosphere of the industrial areas was recorded in the first decade. On average during three years the highest content of technogenic dust was detected in El Bouni.
    Źródło:
    Mining Science; 2016, 23; 183-189
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of PROMETHEE mathematical model for choosing a secondary breakage process of the oversized blocks in limestone quarries
    Autorzy:
    Bouhedja, A.
    Idres, A.
    Boutrid, A.
    Bounouala, M.
    Benselhoub, A.
    Talhi, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/972324.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    centroid weight method
    Hadjar-Soud quarry
    multicriteria analysis
    fragmentation
    Opis:
    In this paper, the approach consists in selecting the best secondary breakage process of oversize blocks with explosives for the limestone quarries. To solve this problem, we propose the centroid weight method for weighting the selection criteria, and the PROMETHEE model as a multicriteria decision making method. A case study is carried out in the limestone quarry of the cement factory of Hadjar-Soud, Algeria.
    Źródło:
    Mining Science; 2016, 23; 121-135
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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