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    Wyświetlanie 1-3 z 3
    Tytuł:
    Studies on the Gases Emission under High Temperature Condition from Moulding Sands Bonded by Modified Starch CMS-Na
    Autorzy:
    Kaczmarska, K.
    Bobrowski, A.
    Żymankowska-Kumon, S.
    Grabowska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/380949.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative moulding material
    sodium carboxymethyl starch
    gas emission
    BTEX
    materiały formierskie
    skrobia modyfikowana
    emisja gazów
    Opis:
    Emission of gases under high temperature after pouring molten metal into moulds, which contain the organic binder or other additives (solvents or curing agent), may be an important factor influencing both on the quality of the produced castings, and on the state of environment. Therefore, a comprehensive studies of the emitted gases would allow to determine restrictions on the use of the moulding sands in foundry technologies, eg. the probability of occurrence of casting defects, and identify the gaseous pollutants emitted to the environment. The aim of the research presented in this paper was to determine the amount of gases that are released at high temperatures from moulding sands bonded by biopolymer binder and the quantitative assessment of the emitted pollutants with particular emphasis on chemical compounds: benzene, toluene, ethylbenzene and xylenes (BTEX). The water-soluble modified potato starch as a sodium carboxymethyl starch with low (CMS-NaL) or high (CMS-NaH) degree of substitution was a binder in the tested moulding sands. A tests of gases emission level were conducted according to the procedure developed at the Faculty of Foundry Engineering (AGH University of Science and Technology) involving gas chromatography method (GC). The obtained results of the determination of amount of BTEX compounds generated during the decomposition process of starch binders showed lower emission of aromatic hydrocarbons in comparison with binder based on resin Kaltharz U404 with the acidic curing agent commonly used in the foundries.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 1; 79-82
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physico-Chemical and Environmental Characterisation of the Dust from Dry Dedusting of the Green Sand
    Autorzy:
    Bobrowski, A.
    Grabowska, B.
    Żymankowska-Kumon, S.
    Kurleto-Kozioł, Ż
    Powiązania:
    https://bibliotekanauki.pl/articles/382689.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dust
    dedusting
    physico-chemical investigations
    heavy metals
    emission of gases
    zapylenie
    odpylanie
    badania fizykochemiczne
    metale ciężkie
    emisja gazów
    Opis:
    The article presents research results of physico-chemical and environmental issues for the dust generated during dedusting of the installation for the processing and preparation of moulding sand with bentonite. Particular attention was paid to the content of heavy metals and emission of gases from the BTEX group, which is one of the determinants of the moulding sands harmfulness for the environment. The analysis of heavy metals in the test samples indicate that there is an increase of the content of all metals in the dust compared to the initial mixture of bentonite. The most significant (almost double) increase observed for zinc is probably related to the adsorption of this element on the dust surface by contact with the liquid metal. The study showed, that dust contained more than 20% of the amount of montmorillonite and had a loss on ignition at a similar level. The addition of 1% of dust to the used moulding sand results in almost 30% increase in the total volume of gases generated in casting processes and nearly 30% increase of the benzene emission.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 33-36
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies on the Gases Emission of Moulding and Core Sands with an Inorganic Binder Containing a Relaxation Additive
    Autorzy:
    Bobrowski, A.
    Żymankowska-Kumon, S.
    Kaczmarska, K.
    Drożyński, D.
    Grabowska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/379837.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    moulding sand
    aluminosilicates
    geopolymer
    inorganic binder
    gases emission
    piasek formierski
    glinokrzemiany
    geopolimer
    spoiwo nieorganiczne
    emisja gazów
    Opis:
    The paper presents the results of an investigation of the gases emission of moulding sands with an inorganic (geopolymer) binder with a relaxation additive, whose main task is to reduce the final (residual) strength and improves knocking-out properties of moulding sand. The moulding sand without a relaxation additive was the reference point. The research was carried out using in accordance with the procedure developed at the Faculty of Foundry Engineering of AGH - University of Science and Technology, on the patented stand for determining gas emissions. Quantification of BTEX compounds was performed involving gas chromatography method (GC).The study showed that the introduction of relaxation additive has no negative impact on gas emissions - both in terms of the total amount of gases generated, as well as emissions of BTEX compounds. Among the BTEX compounds, only benzene is emitted from the tested moulding sands. Its emission is associated with the introduction a small amount of an organic hardener from the group of esters.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 2; 19-25
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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