Wyniki wyszukiwania - BazTech

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Ceramic-Carbon Filters for Molten Metal Alloys Filtration

Asłanowicz M., Ościłowski A., Lipowska B., Witek J., Robak Z., Muzyka R., Kowalski P., Wańczyk K.

Archives of Foundry Engineering

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2019

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iss. 1

98--102

EN

In 2014 we finished research works involved in the development of a technology for manufacturing innovative ceramic-carbon foam filters for molten metal alloys filtration, which were financed by the National Centre for Research and Development (NCBiR) from INNOTECH programme resources. A batch of the filters produced in this technology was tested in practice in domestic cast steel and cast iron foundries. The trials were successful and foundries declared their intention to purchase the newly-developed filters for the current production of casts. This provided an incentive for “Ferro-Term” Sp. z o.o. to start design works on the prototype line for a serial production of these filters. At the same time, in co-operation with a scientific consortium, including the co-authors of the technology, i.e. the Institute of Ceramics and Building Materials, Refractory Materials Division in Gliwice, Institute for the Chemical Processing of Coal in Zabrze and Foundry Research Institute in Cracow, the company made a successful attempt to raise some funds for the necessary adaptation of the developed technology from the semi-technical to industrial scale from Intelligent Development Operational Programme. In the article we have presented information on the effects of works performed within the framework of the project entitled “Modernization and adaptation of the existing technological line for purposes related to technology verification and start-up of the production of innovative ceramic-carbon filters for molten metal alloy filtration”.

2

Combusting fuel formed from waste. Reduction in emission of chromium, nickel and lead

Król D., Poskrobko S.

Environment Protection Engineering

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2017

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Vol. 43, nr 1

101--112

EN

Thermal waste treatment processes dramatically reduce their volume and mass. Unfortunately, they also cause environmental nuisance associated with emissions of harmful substances. The emissions of toxic heavy metals into the air are of particular interest. Low effectiveness of dust extraction equipment for submicron size particles does not provide ecological safety. The paper presents the results of heavy metal (chromium, nickel and lead) emissions from fuel formed from waste combustion. It presents the possibility of reducing that emission by binding heavy metals in the residue scraper. As immobilising metal additives, substances such as: V2O5 and Na2B4O7 were used. Obtained reduction of heavy metal emission was of up to tens percent. In a series of studies, where in addition to Na2B4O7 and V2O5, CaCO3 was added, an additional effect of metal retention in the residue scraper was obtained. Chalk binds chlorine released from the fuel combustible material, which in turn prevents the transformation of heavy metals to form chlorides. Binding of hydrogen chloride from the gas atmosphere of the boiler to calcium chloride, eliminates the ability to create heavy metal chlorides. Addition of chalk reduces also its HCl emission and thus minimizes corrosion of the boiler components.

3

Metalurgiczny plazmotron łukowy do topnienia metali i stopów reaktywnych

Modrzyński A., Namyślak R., Niewiedział R.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

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1999

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z. 58

93-99

4

Obecný matematický model řízení tavby a problémy jeho implementace

Popela P.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

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1998

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z. 57

103-106

EN

The purpose of this paper is to remind basiv concepts of mathematical modelling for melt control problems. Subsequently, important questions related to the possibility of the real-world implementation are discussed.

5

Aplikace dvoustopňové stochastické optimalizace na řízení tavby

Zeman J., Popela P.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

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1998

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z. 57

97-101

EN

The main purpose of this paper is to propose a new two-stage model for cupola furnance melt control. Approaches validated by the historical experiences are considered and their disadvantages are listed. Results obtained for different models are discussed.

6

Entropia topnienia halogenków metali alkalicznych a wakansowy model procesu topnienia

Górecki T., Książek K.

Zeszyty Naukowe. Fizyka / Politechnika Opolska

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1998

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z. 21

59-72

PL

Wychodząc z podstawowych założeń zaproponowanego przez autorów wakansowego modelu procesu topnienia obliczono zmianę entropii halogenków metali alkalicznych w wyniku przejścia z fazy stałej do ciekłej. Entropię topnienia [delta]Sm wyliczono jako sumę składowych związanych ze zmianą konfiguracji jonów, [delta]Sc i rozkładu częstości drgań, [delta]Sv w podsieci kationowej i anionowej w wyniku wzrostu koncentracji defektów Schottky`ego w trakcie topnienia oraz składowej [delta]Ss związanej z maksymalnie czterema stopniami swobody oscylacji i rotacji defektów Schottky`ego powstających w trakcie topnienia. Wykazano, że składowa konfiguracyjna [delta]Sc entropii jest prawie dwukrotnie mniejsza od składowej wibracyjnej[delta]Sv. Składowa [delta]Ss związana z możliwymi stopniami swobody ruchów oscylacyjnych i rotacyjnych defektów Schottky może osiągnąć wartość porównywalną z wartością składowej konfiguracyjnej [delta]Sc. Obliczone wartości całkowitej entropii topnienia wykazują dobrą zgodność z dostępnymi w literaturze danymi doświadczalnymi o entropii topnienia halogenków metali alkalicznych.

EN

The vacancy model of the melting process was used as a starting point for calculating the entropy of alkali halides. The entropy of melting, [delta]Sm, is separated into three parts connected with the effect of vacancies on the configuration, phonon spectrum, and with possible oscillation and rotation degrees of freedom of Schottky defects created during the melting process: [delta]Sm=[delta]Sc+[delta]Sv+[delta]Ss.The results of calculation show that for all the alkali halides the configurational term, [delta]Sc, is by a factor of ~2 smaller than the vibrational term, [delta]Sv. The maximum value of the [delta]Ss term connected with the possible degrees of freedom of Schottky defects created during the melting process is comparable with configurational term [delta]Sc. The calculated value of [delta]Sm are compared with experimental data for all the alkali halides and the agreement is found to be good.