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Determination of Parameters of the Moulding Sand Reclamation Process, on the Thermal Analysis Bases

Łucarz M., Grabowska B., Grabowski G.

Archives of Metallurgy and Materials

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2014

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Vol. 59, iss. 3

1023--1027

EN

For the practical and functional reasons the investigation of the thermal decomposition process is of an essential meaning in relation to the thermal stabilisation of materials and obtaining for them the desired thermal properties. On the other side, thermal tests are carried out in order to identify degradation mechanisms, which is important in the environment protection context, including materials reuse. The cycle of investigations in which thermal TG-DTA methods were applied as supplementary ones for the works on the optimisation of the thermal reclamation process is presented in the hereby paper. The thermal reclamation process as a utilisation method of spent moulding and core sands is more costly than other reclamation methods, but in the majority of cases it simultaneously provides the best cleaning of mineral matrices from organic binders. Thus, the application of the thermal analysis methods (TG-DTA), by determining the temperature range within which a degradation followed by a destruction of bounded organic binders in moulding sands, can contribute to the optimisation of the thermal reclamation process and to the limiting its realisation costs.

PL

Ze względów praktycznych i użytkowych zbadanie procesu degradacji termicznej ma podstawowe znaczenie w odniesieniu do problemu procesu stabilizowania termicznego materiałów i otrzymywania dla nich pożądanych właściwości termicznych. Z drugiej strony badania termiczne prowadzi się w celu rozpoznania mechanizmów ich degradacji, co ma też znaczenie w kontekście ochrony środowiska, w tym ich powtórnego wykorzystania materiałowego. W publikacji przedstawiono cykl badań, w którym zastosowano metody termiczne (TG-DTA) w uzupełnieniu do prowadzonych prac nad optymalizacją procesu regeneracji termicznej. Proces regeneracji termicznej jako sposób utylizacji zużytych mas formierskich i rdzeniowych w stosunku do innych rodzajów regeneracji zużytych mas jest bardziej kosztowny, ale jednocześnie dający w większości przypadków najlepsze oczyszczenie osnowy mineralnej ze spoiw organicznych. Stąd zastosowanie metod analizy termicznej (TG-DTA), poprzez określenie zakresu temperatury, w którym dochodzi do degradacji, a następnie destrukcji związanych spoiw organicznych w masie, może przyczynić się do optymalizacji procesu regeneracji termicznej i zmniejszenia kosztów jego realizacji.

2

Influence of the Thermal Reclamation of the Spent Core Sand Matrix on Its Reuse

Łucarz M.

Archives of Foundry Engineering

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2014

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Vol. 14, iss. 1 spec.

27--30

EN

The investigation results of the thermal reclamation of spent core sands made in the hot-box technology are presented in the paper. Energy-consumption of the process was tested by recording the media consumption during the thermal treatment of the determined intensity. Gas demands in dependence of the reclamation process temperatures were compared. During the reclamation process the reclaimed material samples were taken to test ignition losses in order to determine the efficiency of the realised procedures. The influence of the reclamation temperature on the quality of the obtained reclaimed material was checked. The effects of the realised reclamation procedures of the same moulding sand at various temperatures were also assessed on the grounds of strength of moulding sands prepared on the bases of the obtained reclaims. It was found that the process energy-consumption can depend on the expected core sand parameters. The attention was drawn to the fact, that bearing of costs for the thermal reclamation - very often - does not correspond directly with the obtained effects. The thermal reclamation performed very intensively, which corresponds with the costs increase, is not always needed for obtaining the core sand of parameters comparable with the sand made of fresh components.

3

Thermal regeneration of mineral sorbent using burner unit

Sekret R., Koldej J.

Chemical and Process Engineering

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2013

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Vol. 34, nr 2

191--201

EN

This article presents the results of scientific investigations on the thermal regeneration process of a sorbent of mineral origin sorbent using a retort burner. Diesel oil, a petroleum liquid, most often pervades the environment during different catastrophes. The investigated sorbent of mineral origin was used in the standard way that the Fire Service removes such petroleum liquids from the environment during disasters. For research purposes, a regeneration chamber with a retort burner was constructed. The first phase of the investigation was aimed at defining the physico-chemical features of the sorbent after subsequent cycles of the regeneration process. The second phase involved an analysis of the energy and ecological effects of the regeneration process. The results showed that the first three cycles of the regeneration process occurred under low emission conditions. The proposed regeneration method achieved a positive energetic effect with a functional heat stream with an average value of 12.4 kW (average efficiency of the regeneration chamber was 68 %). The method is very efficient, with regeneration rates between 7.2 kg/h and 8.4 kg/h. It requires only a short amount of time for the start-up and extinction of the regeneration chamber, and it is also flexible to changes in the process conditions.

4

Analiza jakości mas z żywicami oraz osnową poddaną wielocyklicznej regeneracji cieplnej

Łucarz M.

Archiwum Odlewnictwa

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2004

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R. 4, nr 11/1

306--311

PL

Artykuł prezentuje wyniki badań wielokrotnie powtarzanej regeneracji termicznej i termiczno-mechanicznej masy zużytej sporządzanej na bazie tej samej osnowy. Badania wielocyklicznej obróbki przeprowadzono dla różnych żywic syntetycznych. Analizą objęto badania wytrzymałości na zginanie mas na bazie regeneratu po określonej liczbie cykli regeneracji termicznej, bądź też termiczno-mechanicznej obróbce regeneracyjnej.

EN

The article presents the resulte of tests carried out during investigations of multicyclic thermal and thermo-mechanical treatment of used sand subjected to reclamation process. The test sands were prepared on the same quartz basis. The different kinds of synthetic resins were applied in tests of multicyclic thermal treatment of used sands. The analysis was fomsed on bending strength of sand samples subjected to the limited number of thermal reclamation treatment cycles or subjected to thermo-mechanical reclamation processes.